/**
  @license
                                 Apache License
                         Version 2.0, January 2004
                      http://www.apache.org/licenses/

 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

 1. Definitions.

    "License" shall mean the terms and conditions for use, reproduction,
    and distribution as defined by Sections 1 through 9 of this document.

    "Licensor" shall mean the copyright owner or entity authorized by
    the copyright owner that is granting the License.

    "Legal Entity" shall mean the union of the acting entity and all
    other entities that control, are controlled by, or are under common
    control with that entity. For the purposes of this definition,
    "control" means (i) the power, direct or indirect, to cause the
    direction or management of such entity, whether by contract or
    otherwise, or (ii) ownership of fifty percent (50%) or more of the
    outstanding shares, or (iii) beneficial ownership of such entity.

    "You" (or "Your") shall mean an individual or Legal Entity
    exercising permissions granted by this License.

    "Source" form shall mean the preferred form for making modifications,
    including but not limited to software source code, documentation
    source, and configuration files.

    "Object" form shall mean any form resulting from mechanical
    transformation or translation of a Source form, including but
    not limited to compiled object code, generated documentation,
    and conversions to other media types.

    "Work" shall mean the work of authorship, whether in Source or
    Object form, made available under the License, as indicated by a
    copyright notice that is included in or attached to the work
    (an example is provided in the Appendix below).

    "Derivative Works" shall mean any work, whether in Source or Object
    form, that is based on (or derived from) the Work and for which the
    editorial revisions, annotations, elaborations, or other modifications
    represent, as a whole, an original work of authorship. For the purposes
    of this License, Derivative Works shall not include works that remain
    separable from, or merely link (or bind by name) to the interfaces of,
    the Work and Derivative Works thereof.

    "Contribution" shall mean any work of authorship, including
    the original version of the Work and any modifications or additions
    to that Work or Derivative Works thereof, that is intentionally
    submitted to Licensor for inclusion in the Work by the copyright owner
    or by an individual or Legal Entity authorized to submit on behalf of
    the copyright owner. For the purposes of this definition, "submitted"
    means any form of electronic, verbal, or written communication sent
    to the Licensor or its representatives, including but not limited to
    communication on electronic mailing lists, source code control systems,
    and issue tracking systems that are managed by, or on behalf of, the
    Licensor for the purpose of discussing and improving the Work, but
    excluding communication that is conspicuously marked or otherwise
    designated in writing by the copyright owner as "Not a Contribution."

    "Contributor" shall mean Licensor and any individual or Legal Entity
    on behalf of whom a Contribution has been received by Licensor and
    subsequently incorporated within the Work.

 2. Grant of Copyright License. Subject to the terms and conditions of
    this License, each Contributor hereby grants to You a perpetual,
    worldwide, non-exclusive, no-charge, royalty-free, irrevocable
    copyright license to reproduce, prepare Derivative Works of,
    publicly display, publicly perform, sublicense, and distribute the
    Work and such Derivative Works in Source or Object form.

 3. Grant of Patent License. Subject to the terms and conditions of
    this License, each Contributor hereby grants to You a perpetual,
    worldwide, non-exclusive, no-charge, royalty-free, irrevocable
    (except as stated in this section) patent license to make, have made,
    use, offer to sell, sell, import, and otherwise transfer the Work,
    where such license applies only to those patent claims licensable
    by such Contributor that are necessarily infringed by their
    Contribution(s) alone or by combination of their Contribution(s)
    with the Work to which such Contribution(s) was submitted. If You
    institute patent litigation against any entity (including a
    cross-claim or counterclaim in a lawsuit) alleging that the Work
    or a Contribution incorporated within the Work constitutes direct
    or contributory patent infringement, then any patent licenses
    granted to You under this License for that Work shall terminate
    as of the date such litigation is filed.

 4. Redistribution. You may reproduce and distribute copies of the
    Work or Derivative Works thereof in any medium, with or without
    modifications, and in Source or Object form, provided that You
    meet the following conditions:

    (a) You must give any other recipients of the Work or
        Derivative Works a copy of this License; and

    (b) You must cause any modified files to carry prominent notices
        stating that You changed the files; and

    (c) You must retain, in the Source form of any Derivative Works
        that You distribute, all copyright, patent, trademark, and
        attribution notices from the Source form of the Work,
        excluding those notices that do not pertain to any part of
        the Derivative Works; and

    (d) If the Work includes a "NOTICE" text file as part of its
        distribution, then any Derivative Works that You distribute must
        include a readable copy of the attribution notices contained
        within such NOTICE file, excluding those notices that do not
        pertain to any part of the Derivative Works, in at least one
        of the following places: within a NOTICE text file distributed
        as part of the Derivative Works; within the Source form or
        documentation, if provided along with the Derivative Works; or,
        within a display generated by the Derivative Works, if and
        wherever such third-party notices normally appear. The contents
        of the NOTICE file are for informational purposes only and
        do not modify the License. You may add Your own attribution
        notices within Derivative Works that You distribute, alongside
        or as an addendum to the NOTICE text from the Work, provided
        that such additional attribution notices cannot be construed
        as modifying the License.

    You may add Your own copyright statement to Your modifications and
    may provide additional or different license terms and conditions
    for use, reproduction, or distribution of Your modifications, or
    for any such Derivative Works as a whole, provided Your use,
    reproduction, and distribution of the Work otherwise complies with
    the conditions stated in this License.

 5. Submission of Contributions. Unless You explicitly state otherwise,
    any Contribution intentionally submitted for inclusion in the Work
    by You to the Licensor shall be under the terms and conditions of
    this License, without any additional terms or conditions.
    Notwithstanding the above, nothing herein shall supersede or modify
    the terms of any separate license agreement you may have executed
    with Licensor regarding such Contributions.

 6. Trademarks. This License does not grant permission to use the trade
    names, trademarks, service marks, or product names of the Licensor,
    except as required for reasonable and customary use in describing the
    origin of the Work and reproducing the content of the NOTICE file.

 7. Disclaimer of Warranty. Unless required by applicable law or
    agreed to in writing, Licensor provides the Work (and each
    Contributor provides its Contributions) on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
    implied, including, without limitation, any warranties or conditions
    of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
    PARTICULAR PURPOSE. You are solely responsible for determining the
    appropriateness of using or redistributing the Work and assume any
    risks associated with Your exercise of permissions under this License.

 8. Limitation of Liability. In no event and under no legal theory,
    whether in tort (including negligence), contract, or otherwise,
    unless required by applicable law (such as deliberate and grossly
    negligent acts) or agreed to in writing, shall any Contributor be
    liable to You for damages, including any direct, indirect, special,
    incidental, or consequential damages of any character arising as a
    result of this License or out of the use or inability to use the
    Work (including but not limited to damages for loss of goodwill,
    work stoppage, computer failure or malfunction, or any and all
    other commercial damages or losses), even if such Contributor
    has been advised of the possibility of such damages.

 9. Accepting Warranty or Additional Liability. While redistributing
    the Work or Derivative Works thereof, You may choose to offer,
    and charge a fee for, acceptance of support, warranty, indemnity,
    or other liability obligations and/or rights consistent with this
    License. However, in accepting such obligations, You may act only
    on Your own behalf and on Your sole responsibility, not on behalf
    of any other Contributor, and only if You agree to indemnify,
    defend, and hold each Contributor harmless for any liability
    incurred by, or claims asserted against, such Contributor by reason
    of your accepting any such warranty or additional liability.

 END OF TERMS AND CONDITIONS

 APPENDIX: How to apply the Apache License to your work.

    To apply the Apache License to your work, attach the following
    boilerplate notice, with the fields enclosed by brackets "[]"
    replaced with your own identifying information. (Don't include
    the brackets!)  The text should be enclosed in the appropriate
    comment syntax for the file format. We also recommend that a
    file or class name and description of purpose be included on the
    same "printed page" as the copyright notice for easier
    identification within third-party archives.

 Copyright (c) 2015-2017 Google, Inc., Netflix, Inc., Microsoft Corp. and contributors

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 

 **/
/**
  @license
                                 Apache License
                         Version 2.0, January 2004
                      http://www.apache.org/licenses/

 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

 1. Definitions.

    "License" shall mean the terms and conditions for use, reproduction,
    and distribution as defined by Sections 1 through 9 of this document.

    "Licensor" shall mean the copyright owner or entity authorized by
    the copyright owner that is granting the License.

    "Legal Entity" shall mean the union of the acting entity and all
    other entities that control, are controlled by, or are under common
    control with that entity. For the purposes of this definition,
    "control" means (i) the power, direct or indirect, to cause the
    direction or management of such entity, whether by contract or
    otherwise, or (ii) ownership of fifty percent (50%) or more of the
    outstanding shares, or (iii) beneficial ownership of such entity.

    "You" (or "Your") shall mean an individual or Legal Entity
    exercising permissions granted by this License.

    "Source" form shall mean the preferred form for making modifications,
    including but not limited to software source code, documentation
    source, and configuration files.

    "Object" form shall mean any form resulting from mechanical
    transformation or translation of a Source form, including but
    not limited to compiled object code, generated documentation,
    and conversions to other media types.

    "Work" shall mean the work of authorship, whether in Source or
    Object form, made available under the License, as indicated by a
    copyright notice that is included in or attached to the work
    (an example is provided in the Appendix below).

    "Derivative Works" shall mean any work, whether in Source or Object
    form, that is based on (or derived from) the Work and for which the
    editorial revisions, annotations, elaborations, or other modifications
    represent, as a whole, an original work of authorship. For the purposes
    of this License, Derivative Works shall not include works that remain
    separable from, or merely link (or bind by name) to the interfaces of,
    the Work and Derivative Works thereof.

    "Contribution" shall mean any work of authorship, including
    the original version of the Work and any modifications or additions
    to that Work or Derivative Works thereof, that is intentionally
    submitted to Licensor for inclusion in the Work by the copyright owner
    or by an individual or Legal Entity authorized to submit on behalf of
    the copyright owner. For the purposes of this definition, "submitted"
    means any form of electronic, verbal, or written communication sent
    to the Licensor or its representatives, including but not limited to
    communication on electronic mailing lists, source code control systems,
    and issue tracking systems that are managed by, or on behalf of, the
    Licensor for the purpose of discussing and improving the Work, but
    excluding communication that is conspicuously marked or otherwise
    designated in writing by the copyright owner as "Not a Contribution."

    "Contributor" shall mean Licensor and any individual or Legal Entity
    on behalf of whom a Contribution has been received by Licensor and
    subsequently incorporated within the Work.

 2. Grant of Copyright License. Subject to the terms and conditions of
    this License, each Contributor hereby grants to You a perpetual,
    worldwide, non-exclusive, no-charge, royalty-free, irrevocable
    copyright license to reproduce, prepare Derivative Works of,
    publicly display, publicly perform, sublicense, and distribute the
    Work and such Derivative Works in Source or Object form.

 3. Grant of Patent License. Subject to the terms and conditions of
    this License, each Contributor hereby grants to You a perpetual,
    worldwide, non-exclusive, no-charge, royalty-free, irrevocable
    (except as stated in this section) patent license to make, have made,
    use, offer to sell, sell, import, and otherwise transfer the Work,
    where such license applies only to those patent claims licensable
    by such Contributor that are necessarily infringed by their
    Contribution(s) alone or by combination of their Contribution(s)
    with the Work to which such Contribution(s) was submitted. If You
    institute patent litigation against any entity (including a
    cross-claim or counterclaim in a lawsuit) alleging that the Work
    or a Contribution incorporated within the Work constitutes direct
    or contributory patent infringement, then any patent licenses
    granted to You under this License for that Work shall terminate
    as of the date such litigation is filed.

 4. Redistribution. You may reproduce and distribute copies of the
    Work or Derivative Works thereof in any medium, with or without
    modifications, and in Source or Object form, provided that You
    meet the following conditions:

    (a) You must give any other recipients of the Work or
        Derivative Works a copy of this License; and

    (b) You must cause any modified files to carry prominent notices
        stating that You changed the files; and

    (c) You must retain, in the Source form of any Derivative Works
        that You distribute, all copyright, patent, trademark, and
        attribution notices from the Source form of the Work,
        excluding those notices that do not pertain to any part of
        the Derivative Works; and

    (d) If the Work includes a "NOTICE" text file as part of its
        distribution, then any Derivative Works that You distribute must
        include a readable copy of the attribution notices contained
        within such NOTICE file, excluding those notices that do not
        pertain to any part of the Derivative Works, in at least one
        of the following places: within a NOTICE text file distributed
        as part of the Derivative Works; within the Source form or
        documentation, if provided along with the Derivative Works; or,
        within a display generated by the Derivative Works, if and
        wherever such third-party notices normally appear. The contents
        of the NOTICE file are for informational purposes only and
        do not modify the License. You may add Your own attribution
        notices within Derivative Works that You distribute, alongside
        or as an addendum to the NOTICE text from the Work, provided
        that such additional attribution notices cannot be construed
        as modifying the License.

    You may add Your own copyright statement to Your modifications and
    may provide additional or different license terms and conditions
    for use, reproduction, or distribution of Your modifications, or
    for any such Derivative Works as a whole, provided Your use,
    reproduction, and distribution of the Work otherwise complies with
    the conditions stated in this License.

 5. Submission of Contributions. Unless You explicitly state otherwise,
    any Contribution intentionally submitted for inclusion in the Work
    by You to the Licensor shall be under the terms and conditions of
    this License, without any additional terms or conditions.
    Notwithstanding the above, nothing herein shall supersede or modify
    the terms of any separate license agreement you may have executed
    with Licensor regarding such Contributions.

 6. Trademarks. This License does not grant permission to use the trade
    names, trademarks, service marks, or product names of the Licensor,
    except as required for reasonable and customary use in describing the
    origin of the Work and reproducing the content of the NOTICE file.

 7. Disclaimer of Warranty. Unless required by applicable law or
    agreed to in writing, Licensor provides the Work (and each
    Contributor provides its Contributions) on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
    implied, including, without limitation, any warranties or conditions
    of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
    PARTICULAR PURPOSE. You are solely responsible for determining the
    appropriateness of using or redistributing the Work and assume any
    risks associated with Your exercise of permissions under this License.

 8. Limitation of Liability. In no event and under no legal theory,
    whether in tort (including negligence), contract, or otherwise,
    unless required by applicable law (such as deliberate and grossly
    negligent acts) or agreed to in writing, shall any Contributor be
    liable to You for damages, including any direct, indirect, special,
    incidental, or consequential damages of any character arising as a
    result of this License or out of the use or inability to use the
    Work (including but not limited to damages for loss of goodwill,
    work stoppage, computer failure or malfunction, or any and all
    other commercial damages or losses), even if such Contributor
    has been advised of the possibility of such damages.

 9. Accepting Warranty or Additional Liability. While redistributing
    the Work or Derivative Works thereof, You may choose to offer,
    and charge a fee for, acceptance of support, warranty, indemnity,
    or other liability obligations and/or rights consistent with this
    License. However, in accepting such obligations, You may act only
    on Your own behalf and on Your sole responsibility, not on behalf
    of any other Contributor, and only if You agree to indemnify,
    defend, and hold each Contributor harmless for any liability
    incurred by, or claims asserted against, such Contributor by reason
    of your accepting any such warranty or additional liability.

 END OF TERMS AND CONDITIONS

 APPENDIX: How to apply the Apache License to your work.

    To apply the Apache License to your work, attach the following
    boilerplate notice, with the fields enclosed by brackets "[]"
    replaced with your own identifying information. (Don't include
    the brackets!)  The text should be enclosed in the appropriate
    comment syntax for the file format. We also recommend that a
    file or class name and description of purpose be included on the
    same "printed page" as the copyright notice for easier
    identification within third-party archives.

 Copyright (c) 2015-2017 Google, Inc., Netflix, Inc., Microsoft Corp. and contributors

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 

 **/
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
    typeof define === 'function' && define.amd ? define(['exports'], factory) :
    (factory((global.Rx = global.Rx || {})));
}(this, (function (exports) { 'use strict';

/*! *****************************************************************************
Copyright (c) Microsoft Corporation. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at http://www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions
and limitations under the License.
***************************************************************************** */
/* global Reflect, Promise */

var extendStatics = Object.setPrototypeOf ||
    ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
    function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };

function __extends(d, b) {
    extendStatics(d, b);
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
}

















function __values(o) {
    var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
    if (m) return m.call(o);
    return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
}

function __read(o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
}



function __await(v) {
    return this instanceof __await ? (this.v = v, this) : new __await(v);
}

// CommonJS / Node have global context exposed as "global" variable.
// We don't want to include the whole node.d.ts this this compilation unit so we'll just fake
// the global "global" var for now.
var __window = typeof window !== 'undefined' && window;
var __self = typeof self !== 'undefined' && typeof WorkerGlobalScope !== 'undefined' &&
    self instanceof WorkerGlobalScope && self;
var __global = typeof global !== 'undefined' && global;
var _root = __window || __global || __self;
// Workaround Closure Compiler restriction: The body of a goog.module cannot use throw.
// This is needed when used with angular/tsickle which inserts a goog.module statement.
// Wrap in IIFE
(function () {
    if (!_root) {
        throw new Error('RxJS could not find any global context (window, self, global)');
    }
})();

function isFunction(x) {
    return typeof x === 'function';
}

var isArray = Array.isArray || (function (x) { return x && typeof x.length === 'number'; });

function isObject(x) {
    return x != null && typeof x === 'object';
}

// typeof any so that it we don't have to cast when comparing a result to the error object
var errorObject = { e: {} };

var tryCatchTarget;
function tryCatcher() {
    try {
        return tryCatchTarget.apply(this, arguments);
    }
    catch (e) {
        errorObject.e = e;
        return errorObject;
    }
}
function tryCatch(fn) {
    tryCatchTarget = fn;
    return tryCatcher;
}

/**
 * An error thrown when one or more errors have occurred during the
 * `unsubscribe` of a {@link Subscription}.
 */
var UnsubscriptionError = (function (_super) {
    __extends(UnsubscriptionError, _super);
    function UnsubscriptionError(errors) {
        _super.call(this);
        this.errors = errors;
        var err = Error.call(this, errors ?
            errors.length + " errors occurred during unsubscription:\n  " + errors.map(function (err, i) { return ((i + 1) + ") " + err.toString()); }).join('\n  ') : '');
        this.name = err.name = 'UnsubscriptionError';
        this.stack = err.stack;
        this.message = err.message;
    }
    return UnsubscriptionError;
}(Error));

/**
 * Represents a disposable resource, such as the execution of an Observable. A
 * Subscription has one important method, `unsubscribe`, that takes no argument
 * and just disposes the resource held by the subscription.
 *
 * Additionally, subscriptions may be grouped together through the `add()`
 * method, which will attach a child Subscription to the current Subscription.
 * When a Subscription is unsubscribed, all its children (and its grandchildren)
 * will be unsubscribed as well.
 *
 * @class Subscription
 */
var Subscription = (function () {
    /**
     * @param {function(): void} [unsubscribe] A function describing how to
     * perform the disposal of resources when the `unsubscribe` method is called.
     */
    function Subscription(unsubscribe) {
        /**
         * A flag to indicate whether this Subscription has already been unsubscribed.
         * @type {boolean}
         */
        this.closed = false;
        this._parent = null;
        this._parents = null;
        this._subscriptions = null;
        if (unsubscribe) {
            this._unsubscribe = unsubscribe;
        }
    }
    /**
     * Disposes the resources held by the subscription. May, for instance, cancel
     * an ongoing Observable execution or cancel any other type of work that
     * started when the Subscription was created.
     * @return {void}
     */
    Subscription.prototype.unsubscribe = function () {
        var hasErrors = false;
        var errors;
        if (this.closed) {
            return;
        }
        var _a = this, _parent = _a._parent, _parents = _a._parents, _unsubscribe = _a._unsubscribe, _subscriptions = _a._subscriptions;
        this.closed = true;
        this._parent = null;
        this._parents = null;
        // null out _subscriptions first so any child subscriptions that attempt
        // to remove themselves from this subscription will noop
        this._subscriptions = null;
        var index = -1;
        var len = _parents ? _parents.length : 0;
        // if this._parent is null, then so is this._parents, and we
        // don't have to remove ourselves from any parent subscriptions.
        while (_parent) {
            _parent.remove(this);
            // if this._parents is null or index >= len,
            // then _parent is set to null, and the loop exits
            _parent = ++index < len && _parents[index] || null;
        }
        if (isFunction(_unsubscribe)) {
            var trial = tryCatch(_unsubscribe).call(this);
            if (trial === errorObject) {
                hasErrors = true;
                errors = errors || (errorObject.e instanceof UnsubscriptionError ?
                    flattenUnsubscriptionErrors(errorObject.e.errors) : [errorObject.e]);
            }
        }
        if (isArray(_subscriptions)) {
            index = -1;
            len = _subscriptions.length;
            while (++index < len) {
                var sub = _subscriptions[index];
                if (isObject(sub)) {
                    var trial = tryCatch(sub.unsubscribe).call(sub);
                    if (trial === errorObject) {
                        hasErrors = true;
                        errors = errors || [];
                        var err = errorObject.e;
                        if (err instanceof UnsubscriptionError) {
                            errors = errors.concat(flattenUnsubscriptionErrors(err.errors));
                        }
                        else {
                            errors.push(err);
                        }
                    }
                }
            }
        }
        if (hasErrors) {
            throw new UnsubscriptionError(errors);
        }
    };
    /**
     * Adds a tear down to be called during the unsubscribe() of this
     * Subscription.
     *
     * If the tear down being added is a subscription that is already
     * unsubscribed, is the same reference `add` is being called on, or is
     * `Subscription.EMPTY`, it will not be added.
     *
     * If this subscription is already in an `closed` state, the passed
     * tear down logic will be executed immediately.
     *
     * @param {TeardownLogic} teardown The additional logic to execute on
     * teardown.
     * @return {Subscription} Returns the Subscription used or created to be
     * added to the inner subscriptions list. This Subscription can be used with
     * `remove()` to remove the passed teardown logic from the inner subscriptions
     * list.
     */
    Subscription.prototype.add = function (teardown) {
        if (!teardown || (teardown === Subscription.EMPTY)) {
            return Subscription.EMPTY;
        }
        if (teardown === this) {
            return this;
        }
        var subscription = teardown;
        switch (typeof teardown) {
            case 'function':
                subscription = new Subscription(teardown);
            case 'object':
                if (subscription.closed || typeof subscription.unsubscribe !== 'function') {
                    return subscription;
                }
                else if (this.closed) {
                    subscription.unsubscribe();
                    return subscription;
                }
                else if (typeof subscription._addParent !== 'function' /* quack quack */) {
                    var tmp = subscription;
                    subscription = new Subscription();
                    subscription._subscriptions = [tmp];
                }
                break;
            default:
                throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');
        }
        var subscriptions = this._subscriptions || (this._subscriptions = []);
        subscriptions.push(subscription);
        subscription._addParent(this);
        return subscription;
    };
    /**
     * Removes a Subscription from the internal list of subscriptions that will
     * unsubscribe during the unsubscribe process of this Subscription.
     * @param {Subscription} subscription The subscription to remove.
     * @return {void}
     */
    Subscription.prototype.remove = function (subscription) {
        var subscriptions = this._subscriptions;
        if (subscriptions) {
            var subscriptionIndex = subscriptions.indexOf(subscription);
            if (subscriptionIndex !== -1) {
                subscriptions.splice(subscriptionIndex, 1);
            }
        }
    };
    Subscription.prototype._addParent = function (parent) {
        var _a = this, _parent = _a._parent, _parents = _a._parents;
        if (!_parent || _parent === parent) {
            // If we don't have a parent, or the new parent is the same as the
            // current parent, then set this._parent to the new parent.
            this._parent = parent;
        }
        else if (!_parents) {
            // If there's already one parent, but not multiple, allocate an Array to
            // store the rest of the parent Subscriptions.
            this._parents = [parent];
        }
        else if (_parents.indexOf(parent) === -1) {
            // Only add the new parent to the _parents list if it's not already there.
            _parents.push(parent);
        }
    };
    Subscription.EMPTY = (function (empty) {
        empty.closed = true;
        return empty;
    }(new Subscription()));
    return Subscription;
}());
function flattenUnsubscriptionErrors(errors) {
    return errors.reduce(function (errs, err) { return errs.concat((err instanceof UnsubscriptionError) ? err.errors : err); }, []);
}

var empty = {
    closed: true,
    next: function (value) { },
    error: function (err) { throw err; },
    complete: function () { }
};

var Symbol$2 = _root.Symbol;
var rxSubscriber = (typeof Symbol$2 === 'function' && typeof Symbol$2.for === 'function') ?
    Symbol$2.for('rxSubscriber') : '@@rxSubscriber';
/**
 * @deprecated use rxSubscriber instead
 */

/**
 * Implements the {@link Observer} interface and extends the
 * {@link Subscription} class. While the {@link Observer} is the public API for
 * consuming the values of an {@link Observable}, all Observers get converted to
 * a Subscriber, in order to provide Subscription-like capabilities such as
 * `unsubscribe`. Subscriber is a common type in RxJS, and crucial for
 * implementing operators, but it is rarely used as a public API.
 *
 * @class Subscriber<T>
 */
var Subscriber = (function (_super) {
    __extends(Subscriber, _super);
    /**
     * @param {Observer|function(value: T): void} [destinationOrNext] A partially
     * defined Observer or a `next` callback function.
     * @param {function(e: ?any): void} [error] The `error` callback of an
     * Observer.
     * @param {function(): void} [complete] The `complete` callback of an
     * Observer.
     */
    function Subscriber(destinationOrNext, error, complete) {
        _super.call(this);
        this.syncErrorValue = null;
        this.syncErrorThrown = false;
        this.syncErrorThrowable = false;
        this.isStopped = false;
        switch (arguments.length) {
            case 0:
                this.destination = empty;
                break;
            case 1:
                if (!destinationOrNext) {
                    this.destination = empty;
                    break;
                }
                if (typeof destinationOrNext === 'object') {
                    // HACK(benlesh): To resolve an issue where Node users may have multiple
                    // copies of rxjs in their node_modules directory.
                    if (isTrustedSubscriber(destinationOrNext)) {
                        var trustedSubscriber = destinationOrNext[rxSubscriber]();
                        this.syncErrorThrowable = trustedSubscriber.syncErrorThrowable;
                        this.destination = trustedSubscriber;
                        trustedSubscriber.add(this);
                    }
                    else {
                        this.syncErrorThrowable = true;
                        this.destination = new SafeSubscriber(this, destinationOrNext);
                    }
                    break;
                }
            default:
                this.syncErrorThrowable = true;
                this.destination = new SafeSubscriber(this, destinationOrNext, error, complete);
                break;
        }
    }
    Subscriber.prototype[rxSubscriber] = function () { return this; };
    /**
     * A static factory for a Subscriber, given a (potentially partial) definition
     * of an Observer.
     * @param {function(x: ?T): void} [next] The `next` callback of an Observer.
     * @param {function(e: ?any): void} [error] The `error` callback of an
     * Observer.
     * @param {function(): void} [complete] The `complete` callback of an
     * Observer.
     * @return {Subscriber<T>} A Subscriber wrapping the (partially defined)
     * Observer represented by the given arguments.
     */
    Subscriber.create = function (next, error, complete) {
        var subscriber = new Subscriber(next, error, complete);
        subscriber.syncErrorThrowable = false;
        return subscriber;
    };
    /**
     * The {@link Observer} callback to receive notifications of type `next` from
     * the Observable, with a value. The Observable may call this method 0 or more
     * times.
     * @param {T} [value] The `next` value.
     * @return {void}
     */
    Subscriber.prototype.next = function (value) {
        if (!this.isStopped) {
            this._next(value);
        }
    };
    /**
     * The {@link Observer} callback to receive notifications of type `error` from
     * the Observable, with an attached {@link Error}. Notifies the Observer that
     * the Observable has experienced an error condition.
     * @param {any} [err] The `error` exception.
     * @return {void}
     */
    Subscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            this.isStopped = true;
            this._error(err);
        }
    };
    /**
     * The {@link Observer} callback to receive a valueless notification of type
     * `complete` from the Observable. Notifies the Observer that the Observable
     * has finished sending push-based notifications.
     * @return {void}
     */
    Subscriber.prototype.complete = function () {
        if (!this.isStopped) {
            this.isStopped = true;
            this._complete();
        }
    };
    Subscriber.prototype.unsubscribe = function () {
        if (this.closed) {
            return;
        }
        this.isStopped = true;
        _super.prototype.unsubscribe.call(this);
    };
    Subscriber.prototype._next = function (value) {
        this.destination.next(value);
    };
    Subscriber.prototype._error = function (err) {
        this.destination.error(err);
        this.unsubscribe();
    };
    Subscriber.prototype._complete = function () {
        this.destination.complete();
        this.unsubscribe();
    };
    /** @deprecated internal use only */ Subscriber.prototype._unsubscribeAndRecycle = function () {
        var _a = this, _parent = _a._parent, _parents = _a._parents;
        this._parent = null;
        this._parents = null;
        this.unsubscribe();
        this.closed = false;
        this.isStopped = false;
        this._parent = _parent;
        this._parents = _parents;
        return this;
    };
    return Subscriber;
}(Subscription));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SafeSubscriber = (function (_super) {
    __extends(SafeSubscriber, _super);
    function SafeSubscriber(_parentSubscriber, observerOrNext, error, complete) {
        _super.call(this);
        this._parentSubscriber = _parentSubscriber;
        var next;
        var context = this;
        if (isFunction(observerOrNext)) {
            next = observerOrNext;
        }
        else if (observerOrNext) {
            next = observerOrNext.next;
            error = observerOrNext.error;
            complete = observerOrNext.complete;
            if (observerOrNext !== empty) {
                context = Object.create(observerOrNext);
                if (isFunction(context.unsubscribe)) {
                    this.add(context.unsubscribe.bind(context));
                }
                context.unsubscribe = this.unsubscribe.bind(this);
            }
        }
        this._context = context;
        this._next = next;
        this._error = error;
        this._complete = complete;
    }
    SafeSubscriber.prototype.next = function (value) {
        if (!this.isStopped && this._next) {
            var _parentSubscriber = this._parentSubscriber;
            if (!_parentSubscriber.syncErrorThrowable) {
                this.__tryOrUnsub(this._next, value);
            }
            else if (this.__tryOrSetError(_parentSubscriber, this._next, value)) {
                this.unsubscribe();
            }
        }
    };
    SafeSubscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            var _parentSubscriber = this._parentSubscriber;
            if (this._error) {
                if (!_parentSubscriber.syncErrorThrowable) {
                    this.__tryOrUnsub(this._error, err);
                    this.unsubscribe();
                }
                else {
                    this.__tryOrSetError(_parentSubscriber, this._error, err);
                    this.unsubscribe();
                }
            }
            else if (!_parentSubscriber.syncErrorThrowable) {
                this.unsubscribe();
                throw err;
            }
            else {
                _parentSubscriber.syncErrorValue = err;
                _parentSubscriber.syncErrorThrown = true;
                this.unsubscribe();
            }
        }
    };
    SafeSubscriber.prototype.complete = function () {
        var _this = this;
        if (!this.isStopped) {
            var _parentSubscriber = this._parentSubscriber;
            if (this._complete) {
                var wrappedComplete = function () { return _this._complete.call(_this._context); };
                if (!_parentSubscriber.syncErrorThrowable) {
                    this.__tryOrUnsub(wrappedComplete);
                    this.unsubscribe();
                }
                else {
                    this.__tryOrSetError(_parentSubscriber, wrappedComplete);
                    this.unsubscribe();
                }
            }
            else {
                this.unsubscribe();
            }
        }
    };
    SafeSubscriber.prototype.__tryOrUnsub = function (fn, value) {
        try {
            fn.call(this._context, value);
        }
        catch (err) {
            this.unsubscribe();
            throw err;
        }
    };
    SafeSubscriber.prototype.__tryOrSetError = function (parent, fn, value) {
        try {
            fn.call(this._context, value);
        }
        catch (err) {
            parent.syncErrorValue = err;
            parent.syncErrorThrown = true;
            return true;
        }
        return false;
    };
    /** @deprecated internal use only */ SafeSubscriber.prototype._unsubscribe = function () {
        var _parentSubscriber = this._parentSubscriber;
        this._context = null;
        this._parentSubscriber = null;
        _parentSubscriber.unsubscribe();
    };
    return SafeSubscriber;
}(Subscriber));
function isTrustedSubscriber(obj) {
    return obj instanceof Subscriber || ('syncErrorThrowable' in obj && obj[rxSubscriber]);
}

function toSubscriber(nextOrObserver, error, complete) {
    if (nextOrObserver) {
        if (nextOrObserver instanceof Subscriber) {
            return nextOrObserver;
        }
        if (nextOrObserver[rxSubscriber]) {
            return nextOrObserver[rxSubscriber]();
        }
    }
    if (!nextOrObserver && !error && !complete) {
        return new Subscriber(empty);
    }
    return new Subscriber(nextOrObserver, error, complete);
}

function getSymbolObservable(context) {
    var $$observable;
    var Symbol = context.Symbol;
    if (typeof Symbol === 'function') {
        if (Symbol.observable) {
            $$observable = Symbol.observable;
        }
        else {
            $$observable = Symbol('observable');
            Symbol.observable = $$observable;
        }
    }
    else {
        $$observable = '@@observable';
    }
    return $$observable;
}
var observable = getSymbolObservable(_root);
/**
 * @deprecated use observable instead
 */

/* tslint:disable:no-empty */
function noop() { }

/* tslint:enable:max-line-length */
function pipe() {
    var fns = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        fns[_i - 0] = arguments[_i];
    }
    return pipeFromArray(fns);
}
/* @internal */
function pipeFromArray(fns) {
    if (!fns) {
        return noop;
    }
    if (fns.length === 1) {
        return fns[0];
    }
    return function piped(input) {
        return fns.reduce(function (prev, fn) { return fn(prev); }, input);
    };
}

/**
 * A representation of any set of values over any amount of time. This is the most basic building block
 * of RxJS.
 *
 * @class Observable<T>
 */
var Observable = (function () {
    /**
     * @constructor
     * @param {Function} subscribe the function that is called when the Observable is
     * initially subscribed to. This function is given a Subscriber, to which new values
     * can be `next`ed, or an `error` method can be called to raise an error, or
     * `complete` can be called to notify of a successful completion.
     */
    function Observable(subscribe) {
        this._isScalar = false;
        if (subscribe) {
            this._subscribe = subscribe;
        }
    }
    /**
     * Creates a new Observable, with this Observable as the source, and the passed
     * operator defined as the new observable's operator.
     * @method lift
     * @param {Operator} operator the operator defining the operation to take on the observable
     * @return {Observable} a new observable with the Operator applied
     */
    Observable.prototype.lift = function (operator) {
        var observable$$1 = new Observable();
        observable$$1.source = this;
        observable$$1.operator = operator;
        return observable$$1;
    };
    /**
     * Invokes an execution of an Observable and registers Observer handlers for notifications it will emit.
     *
     * <span class="informal">Use it when you have all these Observables, but still nothing is happening.</span>
     *
     * `subscribe` is not a regular operator, but a method that calls Observable's internal `subscribe` function. It
     * might be for example a function that you passed to a {@link create} static factory, but most of the time it is
     * a library implementation, which defines what and when will be emitted by an Observable. This means that calling
     * `subscribe` is actually the moment when Observable starts its work, not when it is created, as it is often
     * thought.
     *
     * Apart from starting the execution of an Observable, this method allows you to listen for values
     * that an Observable emits, as well as for when it completes or errors. You can achieve this in two
     * following ways.
     *
     * The first way is creating an object that implements {@link Observer} interface. It should have methods
     * defined by that interface, but note that it should be just a regular JavaScript object, which you can create
     * yourself in any way you want (ES6 class, classic function constructor, object literal etc.). In particular do
     * not attempt to use any RxJS implementation details to create Observers - you don't need them. Remember also
     * that your object does not have to implement all methods. If you find yourself creating a method that doesn't
     * do anything, you can simply omit it. Note however, that if `error` method is not provided, all errors will
     * be left uncaught.
     *
     * The second way is to give up on Observer object altogether and simply provide callback functions in place of its methods.
     * This means you can provide three functions as arguments to `subscribe`, where first function is equivalent
     * of a `next` method, second of an `error` method and third of a `complete` method. Just as in case of Observer,
     * if you do not need to listen for something, you can omit a function, preferably by passing `undefined` or `null`,
     * since `subscribe` recognizes these functions by where they were placed in function call. When it comes
     * to `error` function, just as before, if not provided, errors emitted by an Observable will be thrown.
     *
     * Whatever style of calling `subscribe` you use, in both cases it returns a Subscription object.
     * This object allows you to call `unsubscribe` on it, which in turn will stop work that an Observable does and will clean
     * up all resources that an Observable used. Note that cancelling a subscription will not call `complete` callback
     * provided to `subscribe` function, which is reserved for a regular completion signal that comes from an Observable.
     *
     * Remember that callbacks provided to `subscribe` are not guaranteed to be called asynchronously.
     * It is an Observable itself that decides when these functions will be called. For example {@link of}
     * by default emits all its values synchronously. Always check documentation for how given Observable
     * will behave when subscribed and if its default behavior can be modified with a {@link Scheduler}.
     *
     * @example <caption>Subscribe with an Observer</caption>
     * const sumObserver = {
     *   sum: 0,
     *   next(value) {
     *     console.log('Adding: ' + value);
     *     this.sum = this.sum + value;
     *   },
     *   error() { // We actually could just remove this method,
     *   },        // since we do not really care about errors right now.
     *   complete() {
     *     console.log('Sum equals: ' + this.sum);
     *   }
     * };
     *
     * Rx.Observable.of(1, 2, 3) // Synchronously emits 1, 2, 3 and then completes.
     * .subscribe(sumObserver);
     *
     * // Logs:
     * // "Adding: 1"
     * // "Adding: 2"
     * // "Adding: 3"
     * // "Sum equals: 6"
     *
     *
     * @example <caption>Subscribe with functions</caption>
     * let sum = 0;
     *
     * Rx.Observable.of(1, 2, 3)
     * .subscribe(
     *   function(value) {
     *     console.log('Adding: ' + value);
     *     sum = sum + value;
     *   },
     *   undefined,
     *   function() {
     *     console.log('Sum equals: ' + sum);
     *   }
     * );
     *
     * // Logs:
     * // "Adding: 1"
     * // "Adding: 2"
     * // "Adding: 3"
     * // "Sum equals: 6"
     *
     *
     * @example <caption>Cancel a subscription</caption>
     * const subscription = Rx.Observable.interval(1000).subscribe(
     *   num => console.log(num),
     *   undefined,
     *   () => console.log('completed!') // Will not be called, even
     * );                                // when cancelling subscription
     *
     *
     * setTimeout(() => {
     *   subscription.unsubscribe();
     *   console.log('unsubscribed!');
     * }, 2500);
     *
     * // Logs:
     * // 0 after 1s
     * // 1 after 2s
     * // "unsubscribed!" after 2.5s
     *
     *
     * @param {Observer|Function} observerOrNext (optional) Either an observer with methods to be called,
     *  or the first of three possible handlers, which is the handler for each value emitted from the subscribed
     *  Observable.
     * @param {Function} error (optional) A handler for a terminal event resulting from an error. If no error handler is provided,
     *  the error will be thrown as unhandled.
     * @param {Function} complete (optional) A handler for a terminal event resulting from successful completion.
     * @return {ISubscription} a subscription reference to the registered handlers
     * @method subscribe
     */
    Observable.prototype.subscribe = function (observerOrNext, error, complete) {
        var operator = this.operator;
        var sink = toSubscriber(observerOrNext, error, complete);
        if (operator) {
            operator.call(sink, this.source);
        }
        else {
            sink.add(this.source || !sink.syncErrorThrowable ? this._subscribe(sink) : this._trySubscribe(sink));
        }
        if (sink.syncErrorThrowable) {
            sink.syncErrorThrowable = false;
            if (sink.syncErrorThrown) {
                throw sink.syncErrorValue;
            }
        }
        return sink;
    };
    Observable.prototype._trySubscribe = function (sink) {
        try {
            return this._subscribe(sink);
        }
        catch (err) {
            sink.syncErrorThrown = true;
            sink.syncErrorValue = err;
            sink.error(err);
        }
    };
    /**
     * @method forEach
     * @param {Function} next a handler for each value emitted by the observable
     * @param {PromiseConstructor} [PromiseCtor] a constructor function used to instantiate the Promise
     * @return {Promise} a promise that either resolves on observable completion or
     *  rejects with the handled error
     */
    Observable.prototype.forEach = function (next, PromiseCtor) {
        var _this = this;
        if (!PromiseCtor) {
            if (_root.Rx && _root.Rx.config && _root.Rx.config.Promise) {
                PromiseCtor = _root.Rx.config.Promise;
            }
            else if (_root.Promise) {
                PromiseCtor = _root.Promise;
            }
        }
        if (!PromiseCtor) {
            throw new Error('no Promise impl found');
        }
        return new PromiseCtor(function (resolve, reject) {
            // Must be declared in a separate statement to avoid a RefernceError when
            // accessing subscription below in the closure due to Temporal Dead Zone.
            var subscription;
            subscription = _this.subscribe(function (value) {
                if (subscription) {
                    // if there is a subscription, then we can surmise
                    // the next handling is asynchronous. Any errors thrown
                    // need to be rejected explicitly and unsubscribe must be
                    // called manually
                    try {
                        next(value);
                    }
                    catch (err) {
                        reject(err);
                        subscription.unsubscribe();
                    }
                }
                else {
                    // if there is NO subscription, then we're getting a nexted
                    // value synchronously during subscription. We can just call it.
                    // If it errors, Observable's `subscribe` will ensure the
                    // unsubscription logic is called, then synchronously rethrow the error.
                    // After that, Promise will trap the error and send it
                    // down the rejection path.
                    next(value);
                }
            }, reject, resolve);
        });
    };
    /** @deprecated internal use only */ Observable.prototype._subscribe = function (subscriber) {
        return this.source.subscribe(subscriber);
    };
    /**
     * An interop point defined by the es7-observable spec https://github.com/zenparsing/es-observable
     * @method Symbol.observable
     * @return {Observable} this instance of the observable
     */
    Observable.prototype[observable] = function () {
        return this;
    };
    /* tslint:enable:max-line-length */
    /**
     * Used to stitch together functional operators into a chain.
     * @method pipe
     * @return {Observable} the Observable result of all of the operators having
     * been called in the order they were passed in.
     *
     * @example
     *
     * import { map, filter, scan } from 'rxjs/operators';
     *
     * Rx.Observable.interval(1000)
     *   .pipe(
     *     filter(x => x % 2 === 0),
     *     map(x => x + x),
     *     scan((acc, x) => acc + x)
     *   )
     *   .subscribe(x => console.log(x))
     */
    Observable.prototype.pipe = function () {
        var operations = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            operations[_i - 0] = arguments[_i];
        }
        if (operations.length === 0) {
            return this;
        }
        return pipeFromArray(operations)(this);
    };
    /* tslint:enable:max-line-length */
    Observable.prototype.toPromise = function (PromiseCtor) {
        var _this = this;
        if (!PromiseCtor) {
            if (_root.Rx && _root.Rx.config && _root.Rx.config.Promise) {
                PromiseCtor = _root.Rx.config.Promise;
            }
            else if (_root.Promise) {
                PromiseCtor = _root.Promise;
            }
        }
        if (!PromiseCtor) {
            throw new Error('no Promise impl found');
        }
        return new PromiseCtor(function (resolve, reject) {
            var value;
            _this.subscribe(function (x) { return value = x; }, function (err) { return reject(err); }, function () { return resolve(value); });
        });
    };
    // HACK: Since TypeScript inherits static properties too, we have to
    // fight against TypeScript here so Subject can have a different static create signature
    /**
     * Creates a new cold Observable by calling the Observable constructor
     * @static true
     * @owner Observable
     * @method create
     * @param {Function} subscribe? the subscriber function to be passed to the Observable constructor
     * @return {Observable} a new cold observable
     */
    Observable.create = function (subscribe) {
        return new Observable(subscribe);
    };
    return Observable;
}());

/**
 * An error thrown when an action is invalid because the object has been
 * unsubscribed.
 *
 * @see {@link Subject}
 * @see {@link BehaviorSubject}
 *
 * @class ObjectUnsubscribedError
 */
var ObjectUnsubscribedError = (function (_super) {
    __extends(ObjectUnsubscribedError, _super);
    function ObjectUnsubscribedError() {
        var err = _super.call(this, 'object unsubscribed');
        this.name = err.name = 'ObjectUnsubscribedError';
        this.stack = err.stack;
        this.message = err.message;
    }
    return ObjectUnsubscribedError;
}(Error));

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SubjectSubscription = (function (_super) {
    __extends(SubjectSubscription, _super);
    function SubjectSubscription(subject, subscriber) {
        _super.call(this);
        this.subject = subject;
        this.subscriber = subscriber;
        this.closed = false;
    }
    SubjectSubscription.prototype.unsubscribe = function () {
        if (this.closed) {
            return;
        }
        this.closed = true;
        var subject = this.subject;
        var observers = subject.observers;
        this.subject = null;
        if (!observers || observers.length === 0 || subject.isStopped || subject.closed) {
            return;
        }
        var subscriberIndex = observers.indexOf(this.subscriber);
        if (subscriberIndex !== -1) {
            observers.splice(subscriberIndex, 1);
        }
    };
    return SubjectSubscription;
}(Subscription));

/**
 * @class SubjectSubscriber<T>
 */
var SubjectSubscriber = (function (_super) {
    __extends(SubjectSubscriber, _super);
    function SubjectSubscriber(destination) {
        _super.call(this, destination);
        this.destination = destination;
    }
    return SubjectSubscriber;
}(Subscriber));
/**
 * @class Subject<T>
 */
var Subject = (function (_super) {
    __extends(Subject, _super);
    function Subject() {
        _super.call(this);
        this.observers = [];
        this.closed = false;
        this.isStopped = false;
        this.hasError = false;
        this.thrownError = null;
    }
    Subject.prototype[rxSubscriber] = function () {
        return new SubjectSubscriber(this);
    };
    Subject.prototype.lift = function (operator) {
        var subject = new AnonymousSubject(this, this);
        subject.operator = operator;
        return subject;
    };
    Subject.prototype.next = function (value) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        if (!this.isStopped) {
            var observers = this.observers;
            var len = observers.length;
            var copy = observers.slice();
            for (var i = 0; i < len; i++) {
                copy[i].next(value);
            }
        }
    };
    Subject.prototype.error = function (err) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        this.hasError = true;
        this.thrownError = err;
        this.isStopped = true;
        var observers = this.observers;
        var len = observers.length;
        var copy = observers.slice();
        for (var i = 0; i < len; i++) {
            copy[i].error(err);
        }
        this.observers.length = 0;
    };
    Subject.prototype.complete = function () {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        this.isStopped = true;
        var observers = this.observers;
        var len = observers.length;
        var copy = observers.slice();
        for (var i = 0; i < len; i++) {
            copy[i].complete();
        }
        this.observers.length = 0;
    };
    Subject.prototype.unsubscribe = function () {
        this.isStopped = true;
        this.closed = true;
        this.observers = null;
    };
    Subject.prototype._trySubscribe = function (subscriber) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        else {
            return _super.prototype._trySubscribe.call(this, subscriber);
        }
    };
    /** @deprecated internal use only */ Subject.prototype._subscribe = function (subscriber) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        else if (this.hasError) {
            subscriber.error(this.thrownError);
            return Subscription.EMPTY;
        }
        else if (this.isStopped) {
            subscriber.complete();
            return Subscription.EMPTY;
        }
        else {
            this.observers.push(subscriber);
            return new SubjectSubscription(this, subscriber);
        }
    };
    Subject.prototype.asObservable = function () {
        var observable = new Observable();
        observable.source = this;
        return observable;
    };
    Subject.create = function (destination, source) {
        return new AnonymousSubject(destination, source);
    };
    return Subject;
}(Observable));
/**
 * @class AnonymousSubject<T>
 */
var AnonymousSubject = (function (_super) {
    __extends(AnonymousSubject, _super);
    function AnonymousSubject(destination, source) {
        _super.call(this);
        this.destination = destination;
        this.source = source;
    }
    AnonymousSubject.prototype.next = function (value) {
        var destination = this.destination;
        if (destination && destination.next) {
            destination.next(value);
        }
    };
    AnonymousSubject.prototype.error = function (err) {
        var destination = this.destination;
        if (destination && destination.error) {
            this.destination.error(err);
        }
    };
    AnonymousSubject.prototype.complete = function () {
        var destination = this.destination;
        if (destination && destination.complete) {
            this.destination.complete();
        }
    };
    /** @deprecated internal use only */ AnonymousSubject.prototype._subscribe = function (subscriber) {
        var source = this.source;
        if (source) {
            return this.source.subscribe(subscriber);
        }
        else {
            return Subscription.EMPTY;
        }
    };
    return AnonymousSubject;
}(Subject));

/**
 * @class AsyncSubject<T>
 */
var AsyncSubject = (function (_super) {
    __extends(AsyncSubject, _super);
    function AsyncSubject() {
        _super.apply(this, arguments);
        this.value = null;
        this.hasNext = false;
        this.hasCompleted = false;
    }
    /** @deprecated internal use only */ AsyncSubject.prototype._subscribe = function (subscriber) {
        if (this.hasError) {
            subscriber.error(this.thrownError);
            return Subscription.EMPTY;
        }
        else if (this.hasCompleted && this.hasNext) {
            subscriber.next(this.value);
            subscriber.complete();
            return Subscription.EMPTY;
        }
        return _super.prototype._subscribe.call(this, subscriber);
    };
    AsyncSubject.prototype.next = function (value) {
        if (!this.hasCompleted) {
            this.value = value;
            this.hasNext = true;
        }
    };
    AsyncSubject.prototype.error = function (error) {
        if (!this.hasCompleted) {
            _super.prototype.error.call(this, error);
        }
    };
    AsyncSubject.prototype.complete = function () {
        this.hasCompleted = true;
        if (this.hasNext) {
            _super.prototype.next.call(this, this.value);
        }
        _super.prototype.complete.call(this);
    };
    return AsyncSubject;
}(Subject));

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var BoundCallbackObservable = (function (_super) {
    __extends(BoundCallbackObservable, _super);
    function BoundCallbackObservable(callbackFunc, selector, args, context, scheduler) {
        _super.call(this);
        this.callbackFunc = callbackFunc;
        this.selector = selector;
        this.args = args;
        this.context = context;
        this.scheduler = scheduler;
    }
    /* tslint:enable:max-line-length */
    /**
     * Converts a callback API to a function that returns an Observable.
     *
     * <span class="informal">Give it a function `f` of type `f(x, callback)` and
     * it will return a function `g` that when called as `g(x)` will output an
     * Observable.</span>
     *
     * `bindCallback` is not an operator because its input and output are not
     * Observables. The input is a function `func` with some parameters, the
     * last parameter must be a callback function that `func` calls when it is
     * done.
     *
     * The output of `bindCallback` is a function that takes the same parameters
     * as `func`, except the last one (the callback). When the output function
     * is called with arguments it will return an Observable. If function `func`
     * calls its callback with one argument the Observable will emit that value.
     * If on the other hand the callback is called with multiple values the resulting
     * Observable will emit an array with said values as arguments.
     *
     * It is very important to remember that input function `func` is not called
     * when the output function is, but rather when the Observable returned by the output
     * function is subscribed. This means if `func` makes an AJAX request, that request
     * will be made every time someone subscribes to the resulting Observable, but not before.
     *
     * Optionally, a selector function can be passed to `bindObservable`. The selector function
     * takes the same arguments as the callback and returns the value that will be emitted by the Observable.
     * Even though by default multiple arguments passed to callback appear in the stream as an array
     * the selector function will be called with arguments directly, just as the callback would.
     * This means you can imagine the default selector (when one is not provided explicitly)
     * as a function that aggregates all its arguments into an array, or simply returns first argument
     * if there is only one.
     *
     * The last optional parameter - {@link Scheduler} - can be used to control when the call
     * to `func` happens after someone subscribes to Observable, as well as when results
     * passed to callback will be emitted. By default, the subscription to  an Observable calls `func`
     * synchronously, but using `Scheduler.async` as the last parameter will defer the call to `func`,
     * just like wrapping the call in `setTimeout` with a timeout of `0` would. If you use the async Scheduler
     * and call `subscribe` on the output Observable all function calls that are currently executing
     * will end before `func` is invoked.
     *
     * By default results passed to the callback are emitted immediately after `func` invokes the callback.
     * In particular, if the callback is called synchronously the subscription of the resulting Observable
     * will call the `next` function synchronously as well.  If you want to defer that call,
     * you may use `Scheduler.async` just as before.  This means that by using `Scheduler.async` you can
     * ensure that `func` always calls its callback asynchronously, thus avoiding terrifying Zalgo.
     *
     * Note that the Observable created by the output function will always emit a single value
     * and then complete immediately. If `func` calls the callback multiple times, values from subsequent
     * calls will not appear in the stream. If you need to listen for multiple calls,
     *  you probably want to use {@link fromEvent} or {@link fromEventPattern} instead.
     *
     * If `func` depends on some context (`this` property) and is not already bound the context of `func`
     * will be the context that the output function has at call time. In particular, if `func`
     * is called as a method of some objec and if `func` is not already bound, in order to preserve the context
     * it is recommended that the context of the output function is set to that object as well.
     *
     * If the input function calls its callback in the "node style" (i.e. first argument to callback is
     * optional error parameter signaling whether the call failed or not), {@link bindNodeCallback}
     * provides convenient error handling and probably is a better choice.
     * `bindCallback` will treat such functions the same as any other and error parameters
     * (whether passed or not) will always be interpreted as regular callback argument.
     *
     *
     * @example <caption>Convert jQuery's getJSON to an Observable API</caption>
     * // Suppose we have jQuery.getJSON('/my/url', callback)
     * var getJSONAsObservable = Rx.Observable.bindCallback(jQuery.getJSON);
     * var result = getJSONAsObservable('/my/url');
     * result.subscribe(x => console.log(x), e => console.error(e));
     *
     *
     * @example <caption>Receive an array of arguments passed to a callback</caption>
     * someFunction((a, b, c) => {
     *   console.log(a); // 5
     *   console.log(b); // 'some string'
     *   console.log(c); // {someProperty: 'someValue'}
     * });
     *
     * const boundSomeFunction = Rx.Observable.bindCallback(someFunction);
     * boundSomeFunction().subscribe(values => {
     *   console.log(values) // [5, 'some string', {someProperty: 'someValue'}]
     * });
     *
     *
     * @example <caption>Use bindCallback with a selector function</caption>
     * someFunction((a, b, c) => {
     *   console.log(a); // 'a'
     *   console.log(b); // 'b'
     *   console.log(c); // 'c'
     * });
     *
     * const boundSomeFunction = Rx.Observable.bindCallback(someFunction, (a, b, c) => a + b + c);
     * boundSomeFunction().subscribe(value => {
     *   console.log(value) // 'abc'
     * });
     *
     *
     * @example <caption>Compare behaviour with and without async Scheduler</caption>
     * function iCallMyCallbackSynchronously(cb) {
     *   cb();
     * }
     *
     * const boundSyncFn = Rx.Observable.bindCallback(iCallMyCallbackSynchronously);
     * const boundAsyncFn = Rx.Observable.bindCallback(iCallMyCallbackSynchronously, null, Rx.Scheduler.async);
     *
     * boundSyncFn().subscribe(() => console.log('I was sync!'));
     * boundAsyncFn().subscribe(() => console.log('I was async!'));
     * console.log('This happened...');
     *
     * // Logs:
     * // I was sync!
     * // This happened...
     * // I was async!
     *
     *
     * @example <caption>Use bindCallback on an object method</caption>
     * const boundMethod = Rx.Observable.bindCallback(someObject.methodWithCallback);
     * boundMethod.call(someObject) // make sure methodWithCallback has access to someObject
     * .subscribe(subscriber);
     *
     *
     * @see {@link bindNodeCallback}
     * @see {@link from}
     * @see {@link fromPromise}
     *
     * @param {function} func A function with a callback as the last parameter.
     * @param {function} [selector] A function which takes the arguments from the
     * callback and maps them to a value that is emitted on the output Observable.
     * @param {Scheduler} [scheduler] The scheduler on which to schedule the
     * callbacks.
     * @return {function(...params: *): Observable} A function which returns the
     * Observable that delivers the same values the callback would deliver.
     * @static true
     * @name bindCallback
     * @owner Observable
     */
    BoundCallbackObservable.create = function (func, selector, scheduler) {
        if (selector === void 0) { selector = undefined; }
        return function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i - 0] = arguments[_i];
            }
            return new BoundCallbackObservable(func, selector, args, this, scheduler);
        };
    };
    /** @deprecated internal use only */ BoundCallbackObservable.prototype._subscribe = function (subscriber) {
        var callbackFunc = this.callbackFunc;
        var args = this.args;
        var scheduler = this.scheduler;
        var subject = this.subject;
        if (!scheduler) {
            if (!subject) {
                subject = this.subject = new AsyncSubject();
                var handler = function handlerFn() {
                    var innerArgs = [];
                    for (var _i = 0; _i < arguments.length; _i++) {
                        innerArgs[_i - 0] = arguments[_i];
                    }
                    var source = handlerFn.source;
                    var selector = source.selector, subject = source.subject;
                    if (selector) {
                        var result_1 = tryCatch(selector).apply(this, innerArgs);
                        if (result_1 === errorObject) {
                            subject.error(errorObject.e);
                        }
                        else {
                            subject.next(result_1);
                            subject.complete();
                        }
                    }
                    else {
                        subject.next(innerArgs.length <= 1 ? innerArgs[0] : innerArgs);
                        subject.complete();
                    }
                };
                // use named function instance to avoid closure.
                handler.source = this;
                var result = tryCatch(callbackFunc).apply(this.context, args.concat(handler));
                if (result === errorObject) {
                    subject.error(errorObject.e);
                }
            }
            return subject.subscribe(subscriber);
        }
        else {
            return scheduler.schedule(BoundCallbackObservable.dispatch, 0, { source: this, subscriber: subscriber, context: this.context });
        }
    };
    BoundCallbackObservable.dispatch = function (state) {
        var self = this;
        var source = state.source, subscriber = state.subscriber, context = state.context;
        var callbackFunc = source.callbackFunc, args = source.args, scheduler = source.scheduler;
        var subject = source.subject;
        if (!subject) {
            subject = source.subject = new AsyncSubject();
            var handler = function handlerFn() {
                var innerArgs = [];
                for (var _i = 0; _i < arguments.length; _i++) {
                    innerArgs[_i - 0] = arguments[_i];
                }
                var source = handlerFn.source;
                var selector = source.selector, subject = source.subject;
                if (selector) {
                    var result_2 = tryCatch(selector).apply(this, innerArgs);
                    if (result_2 === errorObject) {
                        self.add(scheduler.schedule(dispatchError, 0, { err: errorObject.e, subject: subject }));
                    }
                    else {
                        self.add(scheduler.schedule(dispatchNext, 0, { value: result_2, subject: subject }));
                    }
                }
                else {
                    var value = innerArgs.length <= 1 ? innerArgs[0] : innerArgs;
                    self.add(scheduler.schedule(dispatchNext, 0, { value: value, subject: subject }));
                }
            };
            // use named function to pass values in without closure
            handler.source = source;
            var result = tryCatch(callbackFunc).apply(context, args.concat(handler));
            if (result === errorObject) {
                subject.error(errorObject.e);
            }
        }
        self.add(subject.subscribe(subscriber));
    };
    return BoundCallbackObservable;
}(Observable));
function dispatchNext(arg) {
    var value = arg.value, subject = arg.subject;
    subject.next(value);
    subject.complete();
}
function dispatchError(arg) {
    var err = arg.err, subject = arg.subject;
    subject.error(err);
}

var bindCallback = BoundCallbackObservable.create;

Observable.bindCallback = bindCallback;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var BoundNodeCallbackObservable = (function (_super) {
    __extends(BoundNodeCallbackObservable, _super);
    function BoundNodeCallbackObservable(callbackFunc, selector, args, context, scheduler) {
        _super.call(this);
        this.callbackFunc = callbackFunc;
        this.selector = selector;
        this.args = args;
        this.context = context;
        this.scheduler = scheduler;
    }
    /* tslint:enable:max-line-length */
    /**
     * Converts a Node.js-style callback API to a function that returns an
     * Observable.
     *
     * <span class="informal">It's just like {@link bindCallback}, but the
     * callback is expected to be of type `callback(error, result)`.</span>
     *
     * `bindNodeCallback` is not an operator because its input and output are not
     * Observables. The input is a function `func` with some parameters, but the
     * last parameter must be a callback function that `func` calls when it is
     * done. The callback function is expected to follow Node.js conventions,
     * where the first argument to the callback is an error object, signaling
     * whether call was successful. If that object is passed to callback, it means
     * something went wrong.
     *
     * The output of `bindNodeCallback` is a function that takes the same
     * parameters as `func`, except the last one (the callback). When the output
     * function is called with arguments, it will return an Observable.
     * If `func` calls its callback with error parameter present, Observable will
     * error with that value as well. If error parameter is not passed, Observable will emit
     * second parameter. If there are more parameters (third and so on),
     * Observable will emit an array with all arguments, except first error argument.
     *
     * Optionally `bindNodeCallback` accepts selector function, which allows you to
     * make resulting Observable emit value computed by selector, instead of regular
     * callback arguments. It works similarly to {@link bindCallback} selector, but
     * Node.js-style error argument will never be passed to that function.
     *
     * Note that `func` will not be called at the same time output function is,
     * but rather whenever resulting Observable is subscribed. By default call to
     * `func` will happen synchronously after subscription, but that can be changed
     * with proper {@link Scheduler} provided as optional third parameter. Scheduler
     * can also control when values from callback will be emitted by Observable.
     * To find out more, check out documentation for {@link bindCallback}, where
     * Scheduler works exactly the same.
     *
     * As in {@link bindCallback}, context (`this` property) of input function will be set to context
     * of returned function, when it is called.
     *
     * After Observable emits value, it will complete immediately. This means
     * even if `func` calls callback again, values from second and consecutive
     * calls will never appear on the stream. If you need to handle functions
     * that call callbacks multiple times, check out {@link fromEvent} or
     * {@link fromEventPattern} instead.
     *
     * Note that `bindNodeCallback` can be used in non-Node.js environments as well.
     * "Node.js-style" callbacks are just a convention, so if you write for
     * browsers or any other environment and API you use implements that callback style,
     * `bindNodeCallback` can be safely used on that API functions as well.
     *
     * Remember that Error object passed to callback does not have to be an instance
     * of JavaScript built-in `Error` object. In fact, it does not even have to an object.
     * Error parameter of callback function is interpreted as "present", when value
     * of that parameter is truthy. It could be, for example, non-zero number, non-empty
     * string or boolean `true`. In all of these cases resulting Observable would error
     * with that value. This means usually regular style callbacks will fail very often when
     * `bindNodeCallback` is used. If your Observable errors much more often then you
     * would expect, check if callback really is called in Node.js-style and, if not,
     * switch to {@link bindCallback} instead.
     *
     * Note that even if error parameter is technically present in callback, but its value
     * is falsy, it still won't appear in array emitted by Observable or in selector function.
     *
     *
     * @example <caption>Read a file from the filesystem and get the data as an Observable</caption>
     * import * as fs from 'fs';
     * var readFileAsObservable = Rx.Observable.bindNodeCallback(fs.readFile);
     * var result = readFileAsObservable('./roadNames.txt', 'utf8');
     * result.subscribe(x => console.log(x), e => console.error(e));
     *
     *
     * @example <caption>Use on function calling callback with multiple arguments</caption>
     * someFunction((err, a, b) => {
     *   console.log(err); // null
     *   console.log(a); // 5
     *   console.log(b); // "some string"
     * });
     * var boundSomeFunction = Rx.Observable.bindNodeCallback(someFunction);
     * boundSomeFunction()
     * .subscribe(value => {
     *   console.log(value); // [5, "some string"]
     * });
     *
     *
     * @example <caption>Use with selector function</caption>
     * someFunction((err, a, b) => {
     *   console.log(err); // undefined
     *   console.log(a); // "abc"
     *   console.log(b); // "DEF"
     * });
     * var boundSomeFunction = Rx.Observable.bindNodeCallback(someFunction, (a, b) => a + b);
     * boundSomeFunction()
     * .subscribe(value => {
     *   console.log(value); // "abcDEF"
     * });
     *
     *
     * @example <caption>Use on function calling callback in regular style</caption>
     * someFunction(a => {
     *   console.log(a); // 5
     * });
     * var boundSomeFunction = Rx.Observable.bindNodeCallback(someFunction);
     * boundSomeFunction()
     * .subscribe(
     *   value => {}             // never gets called
     *   err => console.log(err) // 5
     *);
     *
     *
     * @see {@link bindCallback}
     * @see {@link from}
     * @see {@link fromPromise}
     *
     * @param {function} func Function with a Node.js-style callback as the last parameter.
     * @param {function} [selector] A function which takes the arguments from the
     * callback and maps those to a value to emit on the output Observable.
     * @param {Scheduler} [scheduler] The scheduler on which to schedule the
     * callbacks.
     * @return {function(...params: *): Observable} A function which returns the
     * Observable that delivers the same values the Node.js callback would
     * deliver.
     * @static true
     * @name bindNodeCallback
     * @owner Observable
     */
    BoundNodeCallbackObservable.create = function (func, selector, scheduler) {
        if (selector === void 0) { selector = undefined; }
        return function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i - 0] = arguments[_i];
            }
            return new BoundNodeCallbackObservable(func, selector, args, this, scheduler);
        };
    };
    /** @deprecated internal use only */ BoundNodeCallbackObservable.prototype._subscribe = function (subscriber) {
        var callbackFunc = this.callbackFunc;
        var args = this.args;
        var scheduler = this.scheduler;
        var subject = this.subject;
        if (!scheduler) {
            if (!subject) {
                subject = this.subject = new AsyncSubject();
                var handler = function handlerFn() {
                    var innerArgs = [];
                    for (var _i = 0; _i < arguments.length; _i++) {
                        innerArgs[_i - 0] = arguments[_i];
                    }
                    var source = handlerFn.source;
                    var selector = source.selector, subject = source.subject;
                    var err = innerArgs.shift();
                    if (err) {
                        subject.error(err);
                    }
                    else if (selector) {
                        var result_1 = tryCatch(selector).apply(this, innerArgs);
                        if (result_1 === errorObject) {
                            subject.error(errorObject.e);
                        }
                        else {
                            subject.next(result_1);
                            subject.complete();
                        }
                    }
                    else {
                        subject.next(innerArgs.length <= 1 ? innerArgs[0] : innerArgs);
                        subject.complete();
                    }
                };
                // use named function instance to avoid closure.
                handler.source = this;
                var result = tryCatch(callbackFunc).apply(this.context, args.concat(handler));
                if (result === errorObject) {
                    subject.error(errorObject.e);
                }
            }
            return subject.subscribe(subscriber);
        }
        else {
            return scheduler.schedule(dispatch, 0, { source: this, subscriber: subscriber, context: this.context });
        }
    };
    return BoundNodeCallbackObservable;
}(Observable));
function dispatch(state) {
    var self = this;
    var source = state.source, subscriber = state.subscriber, context = state.context;
    // XXX: cast to `any` to access to the private field in `source`.
    var _a = source, callbackFunc = _a.callbackFunc, args = _a.args, scheduler = _a.scheduler;
    var subject = source.subject;
    if (!subject) {
        subject = source.subject = new AsyncSubject();
        var handler = function handlerFn() {
            var innerArgs = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                innerArgs[_i - 0] = arguments[_i];
            }
            var source = handlerFn.source;
            var selector = source.selector, subject = source.subject;
            var err = innerArgs.shift();
            if (err) {
                self.add(scheduler.schedule(dispatchError$1, 0, { err: err, subject: subject }));
            }
            else if (selector) {
                var result_2 = tryCatch(selector).apply(this, innerArgs);
                if (result_2 === errorObject) {
                    self.add(scheduler.schedule(dispatchError$1, 0, { err: errorObject.e, subject: subject }));
                }
                else {
                    self.add(scheduler.schedule(dispatchNext$1, 0, { value: result_2, subject: subject }));
                }
            }
            else {
                var value = innerArgs.length <= 1 ? innerArgs[0] : innerArgs;
                self.add(scheduler.schedule(dispatchNext$1, 0, { value: value, subject: subject }));
            }
        };
        // use named function to pass values in without closure
        handler.source = source;
        var result = tryCatch(callbackFunc).apply(context, args.concat(handler));
        if (result === errorObject) {
            self.add(scheduler.schedule(dispatchError$1, 0, { err: errorObject.e, subject: subject }));
        }
    }
    self.add(subject.subscribe(subscriber));
}
function dispatchNext$1(arg) {
    var value = arg.value, subject = arg.subject;
    subject.next(value);
    subject.complete();
}
function dispatchError$1(arg) {
    var err = arg.err, subject = arg.subject;
    subject.error(err);
}

var bindNodeCallback = BoundNodeCallbackObservable.create;

Observable.bindNodeCallback = bindNodeCallback;

function isScheduler(value) {
    return value && typeof value.schedule === 'function';
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var ScalarObservable = (function (_super) {
    __extends(ScalarObservable, _super);
    function ScalarObservable(value, scheduler) {
        _super.call(this);
        this.value = value;
        this.scheduler = scheduler;
        this._isScalar = true;
        if (scheduler) {
            this._isScalar = false;
        }
    }
    ScalarObservable.create = function (value, scheduler) {
        return new ScalarObservable(value, scheduler);
    };
    ScalarObservable.dispatch = function (state) {
        var done = state.done, value = state.value, subscriber = state.subscriber;
        if (done) {
            subscriber.complete();
            return;
        }
        subscriber.next(value);
        if (subscriber.closed) {
            return;
        }
        state.done = true;
        this.schedule(state);
    };
    /** @deprecated internal use only */ ScalarObservable.prototype._subscribe = function (subscriber) {
        var value = this.value;
        var scheduler = this.scheduler;
        if (scheduler) {
            return scheduler.schedule(ScalarObservable.dispatch, 0, {
                done: false, value: value, subscriber: subscriber
            });
        }
        else {
            subscriber.next(value);
            if (!subscriber.closed) {
                subscriber.complete();
            }
        }
    };
    return ScalarObservable;
}(Observable));

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var EmptyObservable = (function (_super) {
    __extends(EmptyObservable, _super);
    function EmptyObservable(scheduler) {
        _super.call(this);
        this.scheduler = scheduler;
    }
    /**
     * Creates an Observable that emits no items to the Observer and immediately
     * emits a complete notification.
     *
     * <span class="informal">Just emits 'complete', and nothing else.
     * </span>
     *
     * <img src="./img/empty.png" width="100%">
     *
     * This static operator is useful for creating a simple Observable that only
     * emits the complete notification. It can be used for composing with other
     * Observables, such as in a {@link mergeMap}.
     *
     * @example <caption>Emit the number 7, then complete.</caption>
     * var result = Rx.Observable.empty().startWith(7);
     * result.subscribe(x => console.log(x));
     *
     * @example <caption>Map and flatten only odd numbers to the sequence 'a', 'b', 'c'</caption>
     * var interval = Rx.Observable.interval(1000);
     * var result = interval.mergeMap(x =>
     *   x % 2 === 1 ? Rx.Observable.of('a', 'b', 'c') : Rx.Observable.empty()
     * );
     * result.subscribe(x => console.log(x));
     *
     * // Results in the following to the console:
     * // x is equal to the count on the interval eg(0,1,2,3,...)
     * // x will occur every 1000ms
     * // if x % 2 is equal to 1 print abc
     * // if x % 2 is not equal to 1 nothing will be output
     *
     * @see {@link create}
     * @see {@link never}
     * @see {@link of}
     * @see {@link throw}
     *
     * @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
     * the emission of the complete notification.
     * @return {Observable} An "empty" Observable: emits only the complete
     * notification.
     * @static true
     * @name empty
     * @owner Observable
     */
    EmptyObservable.create = function (scheduler) {
        return new EmptyObservable(scheduler);
    };
    EmptyObservable.dispatch = function (arg) {
        var subscriber = arg.subscriber;
        subscriber.complete();
    };
    /** @deprecated internal use only */ EmptyObservable.prototype._subscribe = function (subscriber) {
        var scheduler = this.scheduler;
        if (scheduler) {
            return scheduler.schedule(EmptyObservable.dispatch, 0, { subscriber: subscriber });
        }
        else {
            subscriber.complete();
        }
    };
    return EmptyObservable;
}(Observable));

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var ArrayObservable = (function (_super) {
    __extends(ArrayObservable, _super);
    function ArrayObservable(array, scheduler) {
        _super.call(this);
        this.array = array;
        this.scheduler = scheduler;
        if (!scheduler && array.length === 1) {
            this._isScalar = true;
            this.value = array[0];
        }
    }
    ArrayObservable.create = function (array, scheduler) {
        return new ArrayObservable(array, scheduler);
    };
    /**
     * Creates an Observable that emits some values you specify as arguments,
     * immediately one after the other, and then emits a complete notification.
     *
     * <span class="informal">Emits the arguments you provide, then completes.
     * </span>
     *
     * <img src="./img/of.png" width="100%">
     *
     * This static operator is useful for creating a simple Observable that only
     * emits the arguments given, and the complete notification thereafter. It can
     * be used for composing with other Observables, such as with {@link concat}.
     * By default, it uses a `null` IScheduler, which means the `next`
     * notifications are sent synchronously, although with a different IScheduler
     * it is possible to determine when those notifications will be delivered.
     *
     * @example <caption>Emit 10, 20, 30, then 'a', 'b', 'c', then start ticking every second.</caption>
     * var numbers = Rx.Observable.of(10, 20, 30);
     * var letters = Rx.Observable.of('a', 'b', 'c');
     * var interval = Rx.Observable.interval(1000);
     * var result = numbers.concat(letters).concat(interval);
     * result.subscribe(x => console.log(x));
     *
     * @see {@link create}
     * @see {@link empty}
     * @see {@link never}
     * @see {@link throw}
     *
     * @param {...T} values Arguments that represent `next` values to be emitted.
     * @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
     * the emissions of the `next` notifications.
     * @return {Observable<T>} An Observable that emits each given input value.
     * @static true
     * @name of
     * @owner Observable
     */
    ArrayObservable.of = function () {
        var array = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            array[_i - 0] = arguments[_i];
        }
        var scheduler = array[array.length - 1];
        if (isScheduler(scheduler)) {
            array.pop();
        }
        else {
            scheduler = null;
        }
        var len = array.length;
        if (len > 1) {
            return new ArrayObservable(array, scheduler);
        }
        else if (len === 1) {
            return new ScalarObservable(array[0], scheduler);
        }
        else {
            return new EmptyObservable(scheduler);
        }
    };
    ArrayObservable.dispatch = function (state) {
        var array = state.array, index = state.index, count = state.count, subscriber = state.subscriber;
        if (index >= count) {
            subscriber.complete();
            return;
        }
        subscriber.next(array[index]);
        if (subscriber.closed) {
            return;
        }
        state.index = index + 1;
        this.schedule(state);
    };
    /** @deprecated internal use only */ ArrayObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var array = this.array;
        var count = array.length;
        var scheduler = this.scheduler;
        if (scheduler) {
            return scheduler.schedule(ArrayObservable.dispatch, 0, {
                array: array, index: index, count: count, subscriber: subscriber
            });
        }
        else {
            for (var i = 0; i < count && !subscriber.closed; i++) {
                subscriber.next(array[i]);
            }
            subscriber.complete();
        }
    };
    return ArrayObservable;
}(Observable));

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var OuterSubscriber = (function (_super) {
    __extends(OuterSubscriber, _super);
    function OuterSubscriber() {
        _super.apply(this, arguments);
    }
    OuterSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.destination.next(innerValue);
    };
    OuterSubscriber.prototype.notifyError = function (error, innerSub) {
        this.destination.error(error);
    };
    OuterSubscriber.prototype.notifyComplete = function (innerSub) {
        this.destination.complete();
    };
    return OuterSubscriber;
}(Subscriber));

var isArrayLike = (function (x) { return x && typeof x.length === 'number'; });

function isPromise(value) {
    return value && typeof value.subscribe !== 'function' && typeof value.then === 'function';
}

function symbolIteratorPonyfill(root$$1) {
    var Symbol = root$$1.Symbol;
    if (typeof Symbol === 'function') {
        if (!Symbol.iterator) {
            Symbol.iterator = Symbol('iterator polyfill');
        }
        return Symbol.iterator;
    }
    else {
        // [for Mozilla Gecko 27-35:](https://mzl.la/2ewE1zC)
        var Set_1 = root$$1.Set;
        if (Set_1 && typeof new Set_1()['@@iterator'] === 'function') {
            return '@@iterator';
        }
        var Map_1 = root$$1.Map;
        // required for compatability with es6-shim
        if (Map_1) {
            var keys = Object.getOwnPropertyNames(Map_1.prototype);
            for (var i = 0; i < keys.length; ++i) {
                var key = keys[i];
                // according to spec, Map.prototype[@@iterator] and Map.orototype.entries must be equal.
                if (key !== 'entries' && key !== 'size' && Map_1.prototype[key] === Map_1.prototype['entries']) {
                    return key;
                }
            }
        }
        return '@@iterator';
    }
}
var iterator = symbolIteratorPonyfill(_root);
/**
 * @deprecated use iterator instead
 */

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var InnerSubscriber = (function (_super) {
    __extends(InnerSubscriber, _super);
    function InnerSubscriber(parent, outerValue, outerIndex) {
        _super.call(this);
        this.parent = parent;
        this.outerValue = outerValue;
        this.outerIndex = outerIndex;
        this.index = 0;
    }
    InnerSubscriber.prototype._next = function (value) {
        this.parent.notifyNext(this.outerValue, value, this.outerIndex, this.index++, this);
    };
    InnerSubscriber.prototype._error = function (error) {
        this.parent.notifyError(error, this);
        this.unsubscribe();
    };
    InnerSubscriber.prototype._complete = function () {
        this.parent.notifyComplete(this);
        this.unsubscribe();
    };
    return InnerSubscriber;
}(Subscriber));

function subscribeToResult(outerSubscriber, result, outerValue, outerIndex) {
    var destination = new InnerSubscriber(outerSubscriber, outerValue, outerIndex);
    if (destination.closed) {
        return null;
    }
    if (result instanceof Observable) {
        if (result._isScalar) {
            destination.next(result.value);
            destination.complete();
            return null;
        }
        else {
            destination.syncErrorThrowable = true;
            return result.subscribe(destination);
        }
    }
    else if (isArrayLike(result)) {
        for (var i = 0, len = result.length; i < len && !destination.closed; i++) {
            destination.next(result[i]);
        }
        if (!destination.closed) {
            destination.complete();
        }
    }
    else if (isPromise(result)) {
        result.then(function (value) {
            if (!destination.closed) {
                destination.next(value);
                destination.complete();
            }
        }, function (err) { return destination.error(err); })
            .then(null, function (err) {
            // Escaping the Promise trap: globally throw unhandled errors
            _root.setTimeout(function () { throw err; });
        });
        return destination;
    }
    else if (result && typeof result[iterator] === 'function') {
        var iterator$$1 = result[iterator]();
        do {
            var item = iterator$$1.next();
            if (item.done) {
                destination.complete();
                break;
            }
            destination.next(item.value);
            if (destination.closed) {
                break;
            }
        } while (true);
    }
    else if (result && typeof result[observable] === 'function') {
        var obs = result[observable]();
        if (typeof obs.subscribe !== 'function') {
            destination.error(new TypeError('Provided object does not correctly implement Symbol.observable'));
        }
        else {
            return obs.subscribe(new InnerSubscriber(outerSubscriber, outerValue, outerIndex));
        }
    }
    else {
        var value = isObject(result) ? 'an invalid object' : "'" + result + "'";
        var msg = ("You provided " + value + " where a stream was expected.")
            + ' You can provide an Observable, Promise, Array, or Iterable.';
        destination.error(new TypeError(msg));
    }
    return null;
}

var none = {};
/* tslint:enable:max-line-length */
/**
 * Combines multiple Observables to create an Observable whose values are
 * calculated from the latest values of each of its input Observables.
 *
 * <span class="informal">Whenever any input Observable emits a value, it
 * computes a formula using the latest values from all the inputs, then emits
 * the output of that formula.</span>
 *
 * <img src="./img/combineLatest.png" width="100%">
 *
 * `combineLatest` combines the values from this Observable with values from
 * Observables passed as arguments. This is done by subscribing to each
 * Observable, in order, and collecting an array of each of the most recent
 * values any time any of the input Observables emits, then either taking that
 * array and passing it as arguments to an optional `project` function and
 * emitting the return value of that, or just emitting the array of recent
 * values directly if there is no `project` function.
 *
 * @example <caption>Dynamically calculate the Body-Mass Index from an Observable of weight and one for height</caption>
 * var weight = Rx.Observable.of(70, 72, 76, 79, 75);
 * var height = Rx.Observable.of(1.76, 1.77, 1.78);
 * var bmi = weight.combineLatest(height, (w, h) => w / (h * h));
 * bmi.subscribe(x => console.log('BMI is ' + x));
 *
 * // With output to console:
 * // BMI is 24.212293388429753
 * // BMI is 23.93948099205209
 * // BMI is 23.671253629592222
 *
 * @see {@link combineAll}
 * @see {@link merge}
 * @see {@link withLatestFrom}
 *
 * @param {ObservableInput} other An input Observable to combine with the source
 * Observable. More than one input Observables may be given as argument.
 * @param {function} [project] An optional function to project the values from
 * the combined latest values into a new value on the output Observable.
 * @return {Observable} An Observable of projected values from the most recent
 * values from each input Observable, or an array of the most recent values from
 * each input Observable.
 * @method combineLatest
 * @owner Observable
 */
function combineLatest$1() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    var project = null;
    if (typeof observables[observables.length - 1] === 'function') {
        project = observables.pop();
    }
    // if the first and only other argument besides the resultSelector is an array
    // assume it's been called with `combineLatest([obs1, obs2, obs3], project)`
    if (observables.length === 1 && isArray(observables[0])) {
        observables = observables[0].slice();
    }
    return function (source) { return source.lift.call(new ArrayObservable([source].concat(observables)), new CombineLatestOperator(project)); };
}
var CombineLatestOperator = (function () {
    function CombineLatestOperator(project) {
        this.project = project;
    }
    CombineLatestOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new CombineLatestSubscriber(subscriber, this.project));
    };
    return CombineLatestOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var CombineLatestSubscriber = (function (_super) {
    __extends(CombineLatestSubscriber, _super);
    function CombineLatestSubscriber(destination, project) {
        _super.call(this, destination);
        this.project = project;
        this.active = 0;
        this.values = [];
        this.observables = [];
    }
    CombineLatestSubscriber.prototype._next = function (observable) {
        this.values.push(none);
        this.observables.push(observable);
    };
    CombineLatestSubscriber.prototype._complete = function () {
        var observables = this.observables;
        var len = observables.length;
        if (len === 0) {
            this.destination.complete();
        }
        else {
            this.active = len;
            this.toRespond = len;
            for (var i = 0; i < len; i++) {
                var observable = observables[i];
                this.add(subscribeToResult(this, observable, observable, i));
            }
        }
    };
    CombineLatestSubscriber.prototype.notifyComplete = function (unused) {
        if ((this.active -= 1) === 0) {
            this.destination.complete();
        }
    };
    CombineLatestSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var values = this.values;
        var oldVal = values[outerIndex];
        var toRespond = !this.toRespond
            ? 0
            : oldVal === none ? --this.toRespond : this.toRespond;
        values[outerIndex] = innerValue;
        if (toRespond === 0) {
            if (this.project) {
                this._tryProject(values);
            }
            else {
                this.destination.next(values.slice());
            }
        }
    };
    CombineLatestSubscriber.prototype._tryProject = function (values) {
        var result;
        try {
            result = this.project.apply(this, values);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return CombineLatestSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 * Combines multiple Observables to create an Observable whose values are
 * calculated from the latest values of each of its input Observables.
 *
 * <span class="informal">Whenever any input Observable emits a value, it
 * computes a formula using the latest values from all the inputs, then emits
 * the output of that formula.</span>
 *
 * <img src="./img/combineLatest.png" width="100%">
 *
 * `combineLatest` combines the values from all the Observables passed as
 * arguments. This is done by subscribing to each Observable in order and,
 * whenever any Observable emits, collecting an array of the most recent
 * values from each Observable. So if you pass `n` Observables to operator,
 * returned Observable will always emit an array of `n` values, in order
 * corresponding to order of passed Observables (value from the first Observable
 * on the first place and so on).
 *
 * Static version of `combineLatest` accepts either an array of Observables
 * or each Observable can be put directly as an argument. Note that array of
 * Observables is good choice, if you don't know beforehand how many Observables
 * you will combine. Passing empty array will result in Observable that
 * completes immediately.
 *
 * To ensure output array has always the same length, `combineLatest` will
 * actually wait for all input Observables to emit at least once,
 * before it starts emitting results. This means if some Observable emits
 * values before other Observables started emitting, all that values but last
 * will be lost. On the other hand, is some Observable does not emit value but
 * completes, resulting Observable will complete at the same moment without
 * emitting anything, since it will be now impossible to include value from
 * completed Observable in resulting array. Also, if some input Observable does
 * not emit any value and never completes, `combineLatest` will also never emit
 * and never complete, since, again, it will wait for all streams to emit some
 * value.
 *
 * If at least one Observable was passed to `combineLatest` and all passed Observables
 * emitted something, resulting Observable will complete when all combined
 * streams complete. So even if some Observable completes, result of
 * `combineLatest` will still emit values when other Observables do. In case
 * of completed Observable, its value from now on will always be the last
 * emitted value. On the other hand, if any Observable errors, `combineLatest`
 * will error immediately as well, and all other Observables will be unsubscribed.
 *
 * `combineLatest` accepts as optional parameter `project` function, which takes
 * as arguments all values that would normally be emitted by resulting Observable.
 * `project` can return any kind of value, which will be then emitted by Observable
 * instead of default array. Note that `project` does not take as argument that array
 * of values, but values themselves. That means default `project` can be imagined
 * as function that takes all its arguments and puts them into an array.
 *
 *
 * @example <caption>Combine two timer Observables</caption>
 * const firstTimer = Rx.Observable.timer(0, 1000); // emit 0, 1, 2... after every second, starting from now
 * const secondTimer = Rx.Observable.timer(500, 1000); // emit 0, 1, 2... after every second, starting 0,5s from now
 * const combinedTimers = Rx.Observable.combineLatest(firstTimer, secondTimer);
 * combinedTimers.subscribe(value => console.log(value));
 * // Logs
 * // [0, 0] after 0.5s
 * // [1, 0] after 1s
 * // [1, 1] after 1.5s
 * // [2, 1] after 2s
 *
 *
 * @example <caption>Combine an array of Observables</caption>
 * const observables = [1, 5, 10].map(
 *   n => Rx.Observable.of(n).delay(n * 1000).startWith(0) // emit 0 and then emit n after n seconds
 * );
 * const combined = Rx.Observable.combineLatest(observables);
 * combined.subscribe(value => console.log(value));
 * // Logs
 * // [0, 0, 0] immediately
 * // [1, 0, 0] after 1s
 * // [1, 5, 0] after 5s
 * // [1, 5, 10] after 10s
 *
 *
 * @example <caption>Use project function to dynamically calculate the Body-Mass Index</caption>
 * var weight = Rx.Observable.of(70, 72, 76, 79, 75);
 * var height = Rx.Observable.of(1.76, 1.77, 1.78);
 * var bmi = Rx.Observable.combineLatest(weight, height, (w, h) => w / (h * h));
 * bmi.subscribe(x => console.log('BMI is ' + x));
 *
 * // With output to console:
 * // BMI is 24.212293388429753
 * // BMI is 23.93948099205209
 * // BMI is 23.671253629592222
 *
 *
 * @see {@link combineAll}
 * @see {@link merge}
 * @see {@link withLatestFrom}
 *
 * @param {ObservableInput} observable1 An input Observable to combine with other Observables.
 * @param {ObservableInput} observable2 An input Observable to combine with other Observables.
 * More than one input Observables may be given as arguments
 * or an array of Observables may be given as the first argument.
 * @param {function} [project] An optional function to project the values from
 * the combined latest values into a new value on the output Observable.
 * @param {Scheduler} [scheduler=null] The IScheduler to use for subscribing to
 * each input Observable.
 * @return {Observable} An Observable of projected values from the most recent
 * values from each input Observable, or an array of the most recent values from
 * each input Observable.
 * @static true
 * @name combineLatest
 * @owner Observable
 */
function combineLatest$$1() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    var project = null;
    var scheduler = null;
    if (isScheduler(observables[observables.length - 1])) {
        scheduler = observables.pop();
    }
    if (typeof observables[observables.length - 1] === 'function') {
        project = observables.pop();
    }
    // if the first and only other argument besides the resultSelector is an array
    // assume it's been called with `combineLatest([obs1, obs2, obs3], project)`
    if (observables.length === 1 && isArray(observables[0])) {
        observables = observables[0];
    }
    return new ArrayObservable(observables, scheduler).lift(new CombineLatestOperator(project));
}

Observable.combineLatest = combineLatest$$1;

var of = ArrayObservable.of;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var PromiseObservable = (function (_super) {
    __extends(PromiseObservable, _super);
    function PromiseObservable(promise, scheduler) {
        _super.call(this);
        this.promise = promise;
        this.scheduler = scheduler;
    }
    /**
     * Converts a Promise to an Observable.
     *
     * <span class="informal">Returns an Observable that just emits the Promise's
     * resolved value, then completes.</span>
     *
     * Converts an ES2015 Promise or a Promises/A+ spec compliant Promise to an
     * Observable. If the Promise resolves with a value, the output Observable
     * emits that resolved value as a `next`, and then completes. If the Promise
     * is rejected, then the output Observable emits the corresponding Error.
     *
     * @example <caption>Convert the Promise returned by Fetch to an Observable</caption>
     * var result = Rx.Observable.fromPromise(fetch('http://myserver.com/'));
     * result.subscribe(x => console.log(x), e => console.error(e));
     *
     * @see {@link bindCallback}
     * @see {@link from}
     *
     * @param {PromiseLike<T>} promise The promise to be converted.
     * @param {Scheduler} [scheduler] An optional IScheduler to use for scheduling
     * the delivery of the resolved value (or the rejection).
     * @return {Observable<T>} An Observable which wraps the Promise.
     * @static true
     * @name fromPromise
     * @owner Observable
     */
    PromiseObservable.create = function (promise, scheduler) {
        return new PromiseObservable(promise, scheduler);
    };
    /** @deprecated internal use only */ PromiseObservable.prototype._subscribe = function (subscriber) {
        var _this = this;
        var promise = this.promise;
        var scheduler = this.scheduler;
        if (scheduler == null) {
            if (this._isScalar) {
                if (!subscriber.closed) {
                    subscriber.next(this.value);
                    subscriber.complete();
                }
            }
            else {
                promise.then(function (value) {
                    _this.value = value;
                    _this._isScalar = true;
                    if (!subscriber.closed) {
                        subscriber.next(value);
                        subscriber.complete();
                    }
                }, function (err) {
                    if (!subscriber.closed) {
                        subscriber.error(err);
                    }
                })
                    .then(null, function (err) {
                    // escape the promise trap, throw unhandled errors
                    _root.setTimeout(function () { throw err; });
                });
            }
        }
        else {
            if (this._isScalar) {
                if (!subscriber.closed) {
                    return scheduler.schedule(dispatchNext$2, 0, { value: this.value, subscriber: subscriber });
                }
            }
            else {
                promise.then(function (value) {
                    _this.value = value;
                    _this._isScalar = true;
                    if (!subscriber.closed) {
                        subscriber.add(scheduler.schedule(dispatchNext$2, 0, { value: value, subscriber: subscriber }));
                    }
                }, function (err) {
                    if (!subscriber.closed) {
                        subscriber.add(scheduler.schedule(dispatchError$2, 0, { err: err, subscriber: subscriber }));
                    }
                })
                    .then(null, function (err) {
                    // escape the promise trap, throw unhandled errors
                    _root.setTimeout(function () { throw err; });
                });
            }
        }
    };
    return PromiseObservable;
}(Observable));
function dispatchNext$2(arg) {
    var value = arg.value, subscriber = arg.subscriber;
    if (!subscriber.closed) {
        subscriber.next(value);
        subscriber.complete();
    }
}
function dispatchError$2(arg) {
    var err = arg.err, subscriber = arg.subscriber;
    if (!subscriber.closed) {
        subscriber.error(err);
    }
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var IteratorObservable = (function (_super) {
    __extends(IteratorObservable, _super);
    function IteratorObservable(iterator$$1, scheduler) {
        _super.call(this);
        this.scheduler = scheduler;
        if (iterator$$1 == null) {
            throw new Error('iterator cannot be null.');
        }
        this.iterator = getIterator(iterator$$1);
    }
    IteratorObservable.create = function (iterator$$1, scheduler) {
        return new IteratorObservable(iterator$$1, scheduler);
    };
    IteratorObservable.dispatch = function (state) {
        var index = state.index, hasError = state.hasError, iterator$$1 = state.iterator, subscriber = state.subscriber;
        if (hasError) {
            subscriber.error(state.error);
            return;
        }
        var result = iterator$$1.next();
        if (result.done) {
            subscriber.complete();
            return;
        }
        subscriber.next(result.value);
        state.index = index + 1;
        if (subscriber.closed) {
            if (typeof iterator$$1.return === 'function') {
                iterator$$1.return();
            }
            return;
        }
        this.schedule(state);
    };
    /** @deprecated internal use only */ IteratorObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var _a = this, iterator$$1 = _a.iterator, scheduler = _a.scheduler;
        if (scheduler) {
            return scheduler.schedule(IteratorObservable.dispatch, 0, {
                index: index, iterator: iterator$$1, subscriber: subscriber
            });
        }
        else {
            do {
                var result = iterator$$1.next();
                if (result.done) {
                    subscriber.complete();
                    break;
                }
                else {
                    subscriber.next(result.value);
                }
                if (subscriber.closed) {
                    if (typeof iterator$$1.return === 'function') {
                        iterator$$1.return();
                    }
                    break;
                }
            } while (true);
        }
    };
    return IteratorObservable;
}(Observable));
var StringIterator = (function () {
    function StringIterator(str, idx, len) {
        if (idx === void 0) { idx = 0; }
        if (len === void 0) { len = str.length; }
        this.str = str;
        this.idx = idx;
        this.len = len;
    }
    StringIterator.prototype[iterator] = function () { return (this); };
    StringIterator.prototype.next = function () {
        return this.idx < this.len ? {
            done: false,
            value: this.str.charAt(this.idx++)
        } : {
            done: true,
            value: undefined
        };
    };
    return StringIterator;
}());
var ArrayIterator = (function () {
    function ArrayIterator(arr, idx, len) {
        if (idx === void 0) { idx = 0; }
        if (len === void 0) { len = toLength(arr); }
        this.arr = arr;
        this.idx = idx;
        this.len = len;
    }
    ArrayIterator.prototype[iterator] = function () { return this; };
    ArrayIterator.prototype.next = function () {
        return this.idx < this.len ? {
            done: false,
            value: this.arr[this.idx++]
        } : {
            done: true,
            value: undefined
        };
    };
    return ArrayIterator;
}());
function getIterator(obj) {
    var i = obj[iterator];
    if (!i && typeof obj === 'string') {
        return new StringIterator(obj);
    }
    if (!i && obj.length !== undefined) {
        return new ArrayIterator(obj);
    }
    if (!i) {
        throw new TypeError('object is not iterable');
    }
    return obj[iterator]();
}
var maxSafeInteger = Math.pow(2, 53) - 1;
function toLength(o) {
    var len = +o.length;
    if (isNaN(len)) {
        return 0;
    }
    if (len === 0 || !numberIsFinite(len)) {
        return len;
    }
    len = sign(len) * Math.floor(Math.abs(len));
    if (len <= 0) {
        return 0;
    }
    if (len > maxSafeInteger) {
        return maxSafeInteger;
    }
    return len;
}
function numberIsFinite(value) {
    return typeof value === 'number' && _root.isFinite(value);
}
function sign(value) {
    var valueAsNumber = +value;
    if (valueAsNumber === 0) {
        return valueAsNumber;
    }
    if (isNaN(valueAsNumber)) {
        return valueAsNumber;
    }
    return valueAsNumber < 0 ? -1 : 1;
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var ArrayLikeObservable = (function (_super) {
    __extends(ArrayLikeObservable, _super);
    function ArrayLikeObservable(arrayLike, scheduler) {
        _super.call(this);
        this.arrayLike = arrayLike;
        this.scheduler = scheduler;
        if (!scheduler && arrayLike.length === 1) {
            this._isScalar = true;
            this.value = arrayLike[0];
        }
    }
    ArrayLikeObservable.create = function (arrayLike, scheduler) {
        var length = arrayLike.length;
        if (length === 0) {
            return new EmptyObservable();
        }
        else if (length === 1) {
            return new ScalarObservable(arrayLike[0], scheduler);
        }
        else {
            return new ArrayLikeObservable(arrayLike, scheduler);
        }
    };
    ArrayLikeObservable.dispatch = function (state) {
        var arrayLike = state.arrayLike, index = state.index, length = state.length, subscriber = state.subscriber;
        if (subscriber.closed) {
            return;
        }
        if (index >= length) {
            subscriber.complete();
            return;
        }
        subscriber.next(arrayLike[index]);
        state.index = index + 1;
        this.schedule(state);
    };
    /** @deprecated internal use only */ ArrayLikeObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var _a = this, arrayLike = _a.arrayLike, scheduler = _a.scheduler;
        var length = arrayLike.length;
        if (scheduler) {
            return scheduler.schedule(ArrayLikeObservable.dispatch, 0, {
                arrayLike: arrayLike, index: index, length: length, subscriber: subscriber
            });
        }
        else {
            for (var i = 0; i < length && !subscriber.closed; i++) {
                subscriber.next(arrayLike[i]);
            }
            subscriber.complete();
        }
    };
    return ArrayLikeObservable;
}(Observable));

/**
 * Represents a push-based event or value that an {@link Observable} can emit.
 * This class is particularly useful for operators that manage notifications,
 * like {@link materialize}, {@link dematerialize}, {@link observeOn}, and
 * others. Besides wrapping the actual delivered value, it also annotates it
 * with metadata of, for instance, what type of push message it is (`next`,
 * `error`, or `complete`).
 *
 * @see {@link materialize}
 * @see {@link dematerialize}
 * @see {@link observeOn}
 *
 * @class Notification<T>
 */
var Notification = (function () {
    function Notification(kind, value, error) {
        this.kind = kind;
        this.value = value;
        this.error = error;
        this.hasValue = kind === 'N';
    }
    /**
     * Delivers to the given `observer` the value wrapped by this Notification.
     * @param {Observer} observer
     * @return
     */
    Notification.prototype.observe = function (observer) {
        switch (this.kind) {
            case 'N':
                return observer.next && observer.next(this.value);
            case 'E':
                return observer.error && observer.error(this.error);
            case 'C':
                return observer.complete && observer.complete();
        }
    };
    /**
     * Given some {@link Observer} callbacks, deliver the value represented by the
     * current Notification to the correctly corresponding callback.
     * @param {function(value: T): void} next An Observer `next` callback.
     * @param {function(err: any): void} [error] An Observer `error` callback.
     * @param {function(): void} [complete] An Observer `complete` callback.
     * @return {any}
     */
    Notification.prototype.do = function (next, error, complete) {
        var kind = this.kind;
        switch (kind) {
            case 'N':
                return next && next(this.value);
            case 'E':
                return error && error(this.error);
            case 'C':
                return complete && complete();
        }
    };
    /**
     * Takes an Observer or its individual callback functions, and calls `observe`
     * or `do` methods accordingly.
     * @param {Observer|function(value: T): void} nextOrObserver An Observer or
     * the `next` callback.
     * @param {function(err: any): void} [error] An Observer `error` callback.
     * @param {function(): void} [complete] An Observer `complete` callback.
     * @return {any}
     */
    Notification.prototype.accept = function (nextOrObserver, error, complete) {
        if (nextOrObserver && typeof nextOrObserver.next === 'function') {
            return this.observe(nextOrObserver);
        }
        else {
            return this.do(nextOrObserver, error, complete);
        }
    };
    /**
     * Returns a simple Observable that just delivers the notification represented
     * by this Notification instance.
     * @return {any}
     */
    Notification.prototype.toObservable = function () {
        var kind = this.kind;
        switch (kind) {
            case 'N':
                return Observable.of(this.value);
            case 'E':
                return Observable.throw(this.error);
            case 'C':
                return Observable.empty();
        }
        throw new Error('unexpected notification kind value');
    };
    /**
     * A shortcut to create a Notification instance of the type `next` from a
     * given value.
     * @param {T} value The `next` value.
     * @return {Notification<T>} The "next" Notification representing the
     * argument.
     */
    Notification.createNext = function (value) {
        if (typeof value !== 'undefined') {
            return new Notification('N', value);
        }
        return Notification.undefinedValueNotification;
    };
    /**
     * A shortcut to create a Notification instance of the type `error` from a
     * given error.
     * @param {any} [err] The `error` error.
     * @return {Notification<T>} The "error" Notification representing the
     * argument.
     */
    Notification.createError = function (err) {
        return new Notification('E', undefined, err);
    };
    /**
     * A shortcut to create a Notification instance of the type `complete`.
     * @return {Notification<any>} The valueless "complete" Notification.
     */
    Notification.createComplete = function () {
        return Notification.completeNotification;
    };
    Notification.completeNotification = new Notification('C');
    Notification.undefinedValueNotification = new Notification('N', undefined);
    return Notification;
}());

/**
 *
 * Re-emits all notifications from source Observable with specified scheduler.
 *
 * <span class="informal">Ensure a specific scheduler is used, from outside of an Observable.</span>
 *
 * `observeOn` is an operator that accepts a scheduler as a first parameter, which will be used to reschedule
 * notifications emitted by the source Observable. It might be useful, if you do not have control over
 * internal scheduler of a given Observable, but want to control when its values are emitted nevertheless.
 *
 * Returned Observable emits the same notifications (nexted values, complete and error events) as the source Observable,
 * but rescheduled with provided scheduler. Note that this doesn't mean that source Observables internal
 * scheduler will be replaced in any way. Original scheduler still will be used, but when the source Observable emits
 * notification, it will be immediately scheduled again - this time with scheduler passed to `observeOn`.
 * An anti-pattern would be calling `observeOn` on Observable that emits lots of values synchronously, to split
 * that emissions into asynchronous chunks. For this to happen, scheduler would have to be passed into the source
 * Observable directly (usually into the operator that creates it). `observeOn` simply delays notifications a
 * little bit more, to ensure that they are emitted at expected moments.
 *
 * As a matter of fact, `observeOn` accepts second parameter, which specifies in milliseconds with what delay notifications
 * will be emitted. The main difference between {@link delay} operator and `observeOn` is that `observeOn`
 * will delay all notifications - including error notifications - while `delay` will pass through error
 * from source Observable immediately when it is emitted. In general it is highly recommended to use `delay` operator
 * for any kind of delaying of values in the stream, while using `observeOn` to specify which scheduler should be used
 * for notification emissions in general.
 *
 * @example <caption>Ensure values in subscribe are called just before browser repaint.</caption>
 * const intervals = Rx.Observable.interval(10); // Intervals are scheduled
 *                                               // with async scheduler by default...
 *
 * intervals
 * .observeOn(Rx.Scheduler.animationFrame)       // ...but we will observe on animationFrame
 * .subscribe(val => {                           // scheduler to ensure smooth animation.
 *   someDiv.style.height = val + 'px';
 * });
 *
 * @see {@link delay}
 *
 * @param {IScheduler} scheduler Scheduler that will be used to reschedule notifications from source Observable.
 * @param {number} [delay] Number of milliseconds that states with what delay every notification should be rescheduled.
 * @return {Observable<T>} Observable that emits the same notifications as the source Observable,
 * but with provided scheduler.
 *
 * @method observeOn
 * @owner Observable
 */
function observeOn(scheduler, delay) {
    if (delay === void 0) { delay = 0; }
    return function observeOnOperatorFunction(source) {
        return source.lift(new ObserveOnOperator(scheduler, delay));
    };
}
var ObserveOnOperator = (function () {
    function ObserveOnOperator(scheduler, delay) {
        if (delay === void 0) { delay = 0; }
        this.scheduler = scheduler;
        this.delay = delay;
    }
    ObserveOnOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ObserveOnSubscriber(subscriber, this.scheduler, this.delay));
    };
    return ObserveOnOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ObserveOnSubscriber = (function (_super) {
    __extends(ObserveOnSubscriber, _super);
    function ObserveOnSubscriber(destination, scheduler, delay) {
        if (delay === void 0) { delay = 0; }
        _super.call(this, destination);
        this.scheduler = scheduler;
        this.delay = delay;
    }
    ObserveOnSubscriber.dispatch = function (arg) {
        var notification = arg.notification, destination = arg.destination;
        notification.observe(destination);
        this.unsubscribe();
    };
    ObserveOnSubscriber.prototype.scheduleMessage = function (notification) {
        this.add(this.scheduler.schedule(ObserveOnSubscriber.dispatch, this.delay, new ObserveOnMessage(notification, this.destination)));
    };
    ObserveOnSubscriber.prototype._next = function (value) {
        this.scheduleMessage(Notification.createNext(value));
    };
    ObserveOnSubscriber.prototype._error = function (err) {
        this.scheduleMessage(Notification.createError(err));
    };
    ObserveOnSubscriber.prototype._complete = function () {
        this.scheduleMessage(Notification.createComplete());
    };
    return ObserveOnSubscriber;
}(Subscriber));
var ObserveOnMessage = (function () {
    function ObserveOnMessage(notification, destination) {
        this.notification = notification;
        this.destination = destination;
    }
    return ObserveOnMessage;
}());

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var FromObservable = (function (_super) {
    __extends(FromObservable, _super);
    function FromObservable(ish, scheduler) {
        _super.call(this, null);
        this.ish = ish;
        this.scheduler = scheduler;
    }
    /**
     * Creates an Observable from an Array, an array-like object, a Promise, an
     * iterable object, or an Observable-like object.
     *
     * <span class="informal">Converts almost anything to an Observable.</span>
     *
     * <img src="./img/from.png" width="100%">
     *
     * Convert various other objects and data types into Observables. `from`
     * converts a Promise or an array-like or an
     * [iterable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterable)
     * object into an Observable that emits the items in that promise or array or
     * iterable. A String, in this context, is treated as an array of characters.
     * Observable-like objects (contains a function named with the ES2015 Symbol
     * for Observable) can also be converted through this operator.
     *
     * @example <caption>Converts an array to an Observable</caption>
     * var array = [10, 20, 30];
     * var result = Rx.Observable.from(array);
     * result.subscribe(x => console.log(x));
     *
     * // Results in the following:
     * // 10 20 30
     *
     * @example <caption>Convert an infinite iterable (from a generator) to an Observable</caption>
     * function* generateDoubles(seed) {
     *   var i = seed;
     *   while (true) {
     *     yield i;
     *     i = 2 * i; // double it
     *   }
     * }
     *
     * var iterator = generateDoubles(3);
     * var result = Rx.Observable.from(iterator).take(10);
     * result.subscribe(x => console.log(x));
     *
     * // Results in the following:
     * // 3 6 12 24 48 96 192 384 768 1536
     *
     * @see {@link create}
     * @see {@link fromEvent}
     * @see {@link fromEventPattern}
     * @see {@link fromPromise}
     *
     * @param {ObservableInput<T>} ish A subscribable object, a Promise, an
     * Observable-like, an Array, an iterable or an array-like object to be
     * converted.
     * @param {Scheduler} [scheduler] The scheduler on which to schedule the
     * emissions of values.
     * @return {Observable<T>} The Observable whose values are originally from the
     * input object that was converted.
     * @static true
     * @name from
     * @owner Observable
     */
    FromObservable.create = function (ish, scheduler) {
        if (ish != null) {
            if (typeof ish[observable] === 'function') {
                if (ish instanceof Observable && !scheduler) {
                    return ish;
                }
                return new FromObservable(ish, scheduler);
            }
            else if (isArray(ish)) {
                return new ArrayObservable(ish, scheduler);
            }
            else if (isPromise(ish)) {
                return new PromiseObservable(ish, scheduler);
            }
            else if (typeof ish[iterator] === 'function' || typeof ish === 'string') {
                return new IteratorObservable(ish, scheduler);
            }
            else if (isArrayLike(ish)) {
                return new ArrayLikeObservable(ish, scheduler);
            }
        }
        throw new TypeError((ish !== null && typeof ish || ish) + ' is not observable');
    };
    /** @deprecated internal use only */ FromObservable.prototype._subscribe = function (subscriber) {
        var ish = this.ish;
        var scheduler = this.scheduler;
        if (scheduler == null) {
            return ish[observable]().subscribe(subscriber);
        }
        else {
            return ish[observable]().subscribe(new ObserveOnSubscriber(subscriber, scheduler, 0));
        }
    };
    return FromObservable;
}(Observable));

var from = FromObservable.create;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link mergeAll}.</span>
 *
 * <img src="./img/mergeMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an Observable, and then merging those resulting Observables and
 * emitting the results of this merger.
 *
 * @example <caption>Map and flatten each letter to an Observable ticking every 1 second</caption>
 * var letters = Rx.Observable.of('a', 'b', 'c');
 * var result = letters.mergeMap(x =>
 *   Rx.Observable.interval(1000).map(i => x+i)
 * );
 * result.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // a0
 * // b0
 * // c0
 * // a1
 * // b1
 * // c1
 * // continues to list a,b,c with respective ascending integers
 *
 * @see {@link concatMap}
 * @see {@link exhaustMap}
 * @see {@link merge}
 * @see {@link mergeAll}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 * @see {@link switchMap}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and merging the results of the Observables obtained
 * from this transformation.
 * @method mergeMap
 * @owner Observable
 */
function mergeMap(project, resultSelector, concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return function mergeMapOperatorFunction(source) {
        if (typeof resultSelector === 'number') {
            concurrent = resultSelector;
            resultSelector = null;
        }
        return source.lift(new MergeMapOperator(project, resultSelector, concurrent));
    };
}
var MergeMapOperator = (function () {
    function MergeMapOperator(project, resultSelector, concurrent) {
        if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
        this.project = project;
        this.resultSelector = resultSelector;
        this.concurrent = concurrent;
    }
    MergeMapOperator.prototype.call = function (observer, source) {
        return source.subscribe(new MergeMapSubscriber(observer, this.project, this.resultSelector, this.concurrent));
    };
    return MergeMapOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var MergeMapSubscriber = (function (_super) {
    __extends(MergeMapSubscriber, _super);
    function MergeMapSubscriber(destination, project, resultSelector, concurrent) {
        if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
        _super.call(this, destination);
        this.project = project;
        this.resultSelector = resultSelector;
        this.concurrent = concurrent;
        this.hasCompleted = false;
        this.buffer = [];
        this.active = 0;
        this.index = 0;
    }
    MergeMapSubscriber.prototype._next = function (value) {
        if (this.active < this.concurrent) {
            this._tryNext(value);
        }
        else {
            this.buffer.push(value);
        }
    };
    MergeMapSubscriber.prototype._tryNext = function (value) {
        var result;
        var index = this.index++;
        try {
            result = this.project(value, index);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.active++;
        this._innerSub(result, value, index);
    };
    MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {
        this.add(subscribeToResult(this, ish, value, index));
    };
    MergeMapSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (this.active === 0 && this.buffer.length === 0) {
            this.destination.complete();
        }
    };
    MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        if (this.resultSelector) {
            this._notifyResultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            this.destination.next(innerValue);
        }
    };
    MergeMapSubscriber.prototype._notifyResultSelector = function (outerValue, innerValue, outerIndex, innerIndex) {
        var result;
        try {
            result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {
        var buffer = this.buffer;
        this.remove(innerSub);
        this.active--;
        if (buffer.length > 0) {
            this._next(buffer.shift());
        }
        else if (this.active === 0 && this.hasCompleted) {
            this.destination.complete();
        }
    };
    return MergeMapSubscriber;
}(OuterSubscriber));

function identity(x) {
    return x;
}

/**
 * Converts a higher-order Observable into a first-order Observable which
 * concurrently delivers all values that are emitted on the inner Observables.
 *
 * <span class="informal">Flattens an Observable-of-Observables.</span>
 *
 * <img src="./img/mergeAll.png" width="100%">
 *
 * `mergeAll` subscribes to an Observable that emits Observables, also known as
 * a higher-order Observable. Each time it observes one of these emitted inner
 * Observables, it subscribes to that and delivers all the values from the
 * inner Observable on the output Observable. The output Observable only
 * completes once all inner Observables have completed. Any error delivered by
 * a inner Observable will be immediately emitted on the output Observable.
 *
 * @example <caption>Spawn a new interval Observable for each click event, and blend their outputs as one Observable</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
 * var firstOrder = higherOrder.mergeAll();
 * firstOrder.subscribe(x => console.log(x));
 *
 * @example <caption>Count from 0 to 9 every second for each click, but only allow 2 concurrent timers</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(10));
 * var firstOrder = higherOrder.mergeAll(2);
 * firstOrder.subscribe(x => console.log(x));
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link exhaust}
 * @see {@link merge}
 * @see {@link mergeMap}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 * @see {@link switch}
 * @see {@link zipAll}
 *
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of inner
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits values coming from all the
 * inner Observables emitted by the source Observable.
 * @method mergeAll
 * @owner Observable
 */
function mergeAll(concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return mergeMap(identity, null, concurrent);
}

/**
 * Converts a higher-order Observable into a first-order Observable by
 * concatenating the inner Observables in order.
 *
 * <span class="informal">Flattens an Observable-of-Observables by putting one
 * inner Observable after the other.</span>
 *
 * <img src="./img/concatAll.png" width="100%">
 *
 * Joins every Observable emitted by the source (a higher-order Observable), in
 * a serial fashion. It subscribes to each inner Observable only after the
 * previous inner Observable has completed, and merges all of their values into
 * the returned observable.
 *
 * __Warning:__ If the source Observable emits Observables quickly and
 * endlessly, and the inner Observables it emits generally complete slower than
 * the source emits, you can run into memory issues as the incoming Observables
 * collect in an unbounded buffer.
 *
 * Note: `concatAll` is equivalent to `mergeAll` with concurrency parameter set
 * to `1`.
 *
 * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map(ev => Rx.Observable.interval(1000).take(4));
 * var firstOrder = higherOrder.concatAll();
 * firstOrder.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // (results are not concurrent)
 * // For every click on the "document" it will emit values 0 to 3 spaced
 * // on a 1000ms interval
 * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
 *
 * @see {@link combineAll}
 * @see {@link concat}
 * @see {@link concatMap}
 * @see {@link concatMapTo}
 * @see {@link exhaust}
 * @see {@link mergeAll}
 * @see {@link switch}
 * @see {@link zipAll}
 *
 * @return {Observable} An Observable emitting values from all the inner
 * Observables concatenated.
 * @method concatAll
 * @owner Observable
 */
function concatAll() {
    return mergeAll(1);
}

/* tslint:enable:max-line-length */
/**
 * Creates an output Observable which sequentially emits all values from given
 * Observable and then moves on to the next.
 *
 * <span class="informal">Concatenates multiple Observables together by
 * sequentially emitting their values, one Observable after the other.</span>
 *
 * <img src="./img/concat.png" width="100%">
 *
 * `concat` joins multiple Observables together, by subscribing to them one at a time and
 * merging their results into the output Observable. You can pass either an array of
 * Observables, or put them directly as arguments. Passing an empty array will result
 * in Observable that completes immediately.
 *
 * `concat` will subscribe to first input Observable and emit all its values, without
 * changing or affecting them in any way. When that Observable completes, it will
 * subscribe to then next Observable passed and, again, emit its values. This will be
 * repeated, until the operator runs out of Observables. When last input Observable completes,
 * `concat` will complete as well. At any given moment only one Observable passed to operator
 * emits values. If you would like to emit values from passed Observables concurrently, check out
 * {@link merge} instead, especially with optional `concurrent` parameter. As a matter of fact,
 * `concat` is an equivalent of `merge` operator with `concurrent` parameter set to `1`.
 *
 * Note that if some input Observable never completes, `concat` will also never complete
 * and Observables following the one that did not complete will never be subscribed. On the other
 * hand, if some Observable simply completes immediately after it is subscribed, it will be
 * invisible for `concat`, which will just move on to the next Observable.
 *
 * If any Observable in chain errors, instead of passing control to the next Observable,
 * `concat` will error immediately as well. Observables that would be subscribed after
 * the one that emitted error, never will.
 *
 * If you pass to `concat` the same Observable many times, its stream of values
 * will be "replayed" on every subscription, which means you can repeat given Observable
 * as many times as you like. If passing the same Observable to `concat` 1000 times becomes tedious,
 * you can always use {@link repeat}.
 *
 * @example <caption>Concatenate a timer counting from 0 to 3 with a synchronous sequence from 1 to 10</caption>
 * var timer = Rx.Observable.interval(1000).take(4);
 * var sequence = Rx.Observable.range(1, 10);
 * var result = Rx.Observable.concat(timer, sequence);
 * result.subscribe(x => console.log(x));
 *
 * // results in:
 * // 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3 -immediate-> 1 ... 10
 *
 *
 * @example <caption>Concatenate an array of 3 Observables</caption>
 * var timer1 = Rx.Observable.interval(1000).take(10);
 * var timer2 = Rx.Observable.interval(2000).take(6);
 * var timer3 = Rx.Observable.interval(500).take(10);
 * var result = Rx.Observable.concat([timer1, timer2, timer3]); // note that array is passed
 * result.subscribe(x => console.log(x));
 *
 * // results in the following:
 * // (Prints to console sequentially)
 * // -1000ms-> 0 -1000ms-> 1 -1000ms-> ... 9
 * // -2000ms-> 0 -2000ms-> 1 -2000ms-> ... 5
 * // -500ms-> 0 -500ms-> 1 -500ms-> ... 9
 *
 *
 * @example <caption>Concatenate the same Observable to repeat it</caption>
 * const timer = Rx.Observable.interval(1000).take(2);
 *
 * Rx.Observable.concat(timer, timer) // concating the same Observable!
 * .subscribe(
 *   value => console.log(value),
 *   err => {},
 *   () => console.log('...and it is done!')
 * );
 *
 * // Logs:
 * // 0 after 1s
 * // 1 after 2s
 * // 0 after 3s
 * // 1 after 4s
 * // "...and it is done!" also after 4s
 *
 * @see {@link concatAll}
 * @see {@link concatMap}
 * @see {@link concatMapTo}
 *
 * @param {ObservableInput} input1 An input Observable to concatenate with others.
 * @param {ObservableInput} input2 An input Observable to concatenate with others.
 * More than one input Observables may be given as argument.
 * @param {Scheduler} [scheduler=null] An optional IScheduler to schedule each
 * Observable subscription on.
 * @return {Observable} All values of each passed Observable merged into a
 * single Observable, in order, in serial fashion.
 * @static true
 * @name concat
 * @owner Observable
 */
function concat() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    if (observables.length === 1 || (observables.length === 2 && isScheduler(observables[1]))) {
        return from(observables[0]);
    }
    return concatAll()(of.apply(void 0, observables));
}

Observable.concat = concat;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var DeferObservable = (function (_super) {
    __extends(DeferObservable, _super);
    function DeferObservable(observableFactory) {
        _super.call(this);
        this.observableFactory = observableFactory;
    }
    /**
     * Creates an Observable that, on subscribe, calls an Observable factory to
     * make an Observable for each new Observer.
     *
     * <span class="informal">Creates the Observable lazily, that is, only when it
     * is subscribed.
     * </span>
     *
     * <img src="./img/defer.png" width="100%">
     *
     * `defer` allows you to create the Observable only when the Observer
     * subscribes, and create a fresh Observable for each Observer. It waits until
     * an Observer subscribes to it, and then it generates an Observable,
     * typically with an Observable factory function. It does this afresh for each
     * subscriber, so although each subscriber may think it is subscribing to the
     * same Observable, in fact each subscriber gets its own individual
     * Observable.
     *
     * @example <caption>Subscribe to either an Observable of clicks or an Observable of interval, at random</caption>
     * var clicksOrInterval = Rx.Observable.defer(function () {
     *   if (Math.random() > 0.5) {
     *     return Rx.Observable.fromEvent(document, 'click');
     *   } else {
     *     return Rx.Observable.interval(1000);
     *   }
     * });
     * clicksOrInterval.subscribe(x => console.log(x));
     *
     * // Results in the following behavior:
     * // If the result of Math.random() is greater than 0.5 it will listen
     * // for clicks anywhere on the "document"; when document is clicked it
     * // will log a MouseEvent object to the console. If the result is less
     * // than 0.5 it will emit ascending numbers, one every second(1000ms).
     *
     * @see {@link create}
     *
     * @param {function(): SubscribableOrPromise} observableFactory The Observable
     * factory function to invoke for each Observer that subscribes to the output
     * Observable. May also return a Promise, which will be converted on the fly
     * to an Observable.
     * @return {Observable} An Observable whose Observers' subscriptions trigger
     * an invocation of the given Observable factory function.
     * @static true
     * @name defer
     * @owner Observable
     */
    DeferObservable.create = function (observableFactory) {
        return new DeferObservable(observableFactory);
    };
    /** @deprecated internal use only */ DeferObservable.prototype._subscribe = function (subscriber) {
        return new DeferSubscriber(subscriber, this.observableFactory);
    };
    return DeferObservable;
}(Observable));
var DeferSubscriber = (function (_super) {
    __extends(DeferSubscriber, _super);
    function DeferSubscriber(destination, factory) {
        _super.call(this, destination);
        this.factory = factory;
        this.tryDefer();
    }
    DeferSubscriber.prototype.tryDefer = function () {
        try {
            this._callFactory();
        }
        catch (err) {
            this._error(err);
        }
    };
    DeferSubscriber.prototype._callFactory = function () {
        var result = this.factory();
        if (result) {
            this.add(subscribeToResult(this, result));
        }
    };
    return DeferSubscriber;
}(OuterSubscriber));

var defer = DeferObservable.create;

Observable.defer = defer;

var empty$1 = EmptyObservable.create;

Observable.empty = empty$1;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var ForkJoinObservable = (function (_super) {
    __extends(ForkJoinObservable, _super);
    function ForkJoinObservable(sources, resultSelector) {
        _super.call(this);
        this.sources = sources;
        this.resultSelector = resultSelector;
    }
    /* tslint:enable:max-line-length */
    /**
     * Joins last values emitted by passed Observables.
     *
     * <span class="informal">Wait for Observables to complete and then combine last values they emitted.</span>
     *
     * <img src="./img/forkJoin.png" width="100%">
     *
     * `forkJoin` is an operator that takes any number of Observables which can be passed either as an array
     * or directly as arguments. If no input Observables are provided, resulting stream will complete
     * immediately.
     *
     * `forkJoin` will wait for all passed Observables to complete and then it will emit an array with last
     * values from corresponding Observables. So if you pass `n` Observables to the operator, resulting
     * array will have `n` values, where first value is the last thing emitted by the first Observable,
     * second value is the last thing emitted by the second Observable and so on. That means `forkJoin` will
     * not emit more than once and it will complete after that. If you need to emit combined values not only
     * at the end of lifecycle of passed Observables, but also throughout it, try out {@link combineLatest}
     * or {@link zip} instead.
     *
     * In order for resulting array to have the same length as the number of input Observables, whenever any of
     * that Observables completes without emitting any value, `forkJoin` will complete at that moment as well
     * and it will not emit anything either, even if it already has some last values from other Observables.
     * Conversely, if there is an Observable that never completes, `forkJoin` will never complete as well,
     * unless at any point some other Observable completes without emitting value, which brings us back to
     * the previous case. Overall, in order for `forkJoin` to emit a value, all Observables passed as arguments
     * have to emit something at least once and complete.
     *
     * If any input Observable errors at some point, `forkJoin` will error as well and all other Observables
     * will be immediately unsubscribed.
     *
     * Optionally `forkJoin` accepts project function, that will be called with values which normally
     * would land in emitted array. Whatever is returned by project function, will appear in output
     * Observable instead. This means that default project can be thought of as a function that takes
     * all its arguments and puts them into an array. Note that project function will be called only
     * when output Observable is supposed to emit a result.
     *
     * @example <caption>Use forkJoin with operator emitting immediately</caption>
     * const observable = Rx.Observable.forkJoin(
     *   Rx.Observable.of(1, 2, 3, 4),
     *   Rx.Observable.of(5, 6, 7, 8)
     * );
     * observable.subscribe(
     *   value => console.log(value),
     *   err => {},
     *   () => console.log('This is how it ends!')
     * );
     *
     * // Logs:
     * // [4, 8]
     * // "This is how it ends!"
     *
     *
     * @example <caption>Use forkJoin with operator emitting after some time</caption>
     * const observable = Rx.Observable.forkJoin(
     *   Rx.Observable.interval(1000).take(3), // emit 0, 1, 2 every second and complete
     *   Rx.Observable.interval(500).take(4) // emit 0, 1, 2, 3 every half a second and complete
     * );
     * observable.subscribe(
     *   value => console.log(value),
     *   err => {},
     *   () => console.log('This is how it ends!')
     * );
     *
     * // Logs:
     * // [2, 3] after 3 seconds
     * // "This is how it ends!" immediately after
     *
     *
     * @example <caption>Use forkJoin with project function</caption>
     * const observable = Rx.Observable.forkJoin(
     *   Rx.Observable.interval(1000).take(3), // emit 0, 1, 2 every second and complete
     *   Rx.Observable.interval(500).take(4), // emit 0, 1, 2, 3 every half a second and complete
     *   (n, m) => n + m
     * );
     * observable.subscribe(
     *   value => console.log(value),
     *   err => {},
     *   () => console.log('This is how it ends!')
     * );
     *
     * // Logs:
     * // 5 after 3 seconds
     * // "This is how it ends!" immediately after
     *
     * @see {@link combineLatest}
     * @see {@link zip}
     *
     * @param {...SubscribableOrPromise} sources Any number of Observables provided either as an array or as an arguments
     * passed directly to the operator.
     * @param {function} [project] Function that takes values emitted by input Observables and returns value
     * that will appear in resulting Observable instead of default array.
     * @return {Observable} Observable emitting either an array of last values emitted by passed Observables
     * or value from project function.
     * @static true
     * @name forkJoin
     * @owner Observable
     */
    ForkJoinObservable.create = function () {
        var sources = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            sources[_i - 0] = arguments[_i];
        }
        if (sources === null || arguments.length === 0) {
            return new EmptyObservable();
        }
        var resultSelector = null;
        if (typeof sources[sources.length - 1] === 'function') {
            resultSelector = sources.pop();
        }
        // if the first and only other argument besides the resultSelector is an array
        // assume it's been called with `forkJoin([obs1, obs2, obs3], resultSelector)`
        if (sources.length === 1 && isArray(sources[0])) {
            sources = sources[0];
        }
        if (sources.length === 0) {
            return new EmptyObservable();
        }
        return new ForkJoinObservable(sources, resultSelector);
    };
    /** @deprecated internal use only */ ForkJoinObservable.prototype._subscribe = function (subscriber) {
        return new ForkJoinSubscriber(subscriber, this.sources, this.resultSelector);
    };
    return ForkJoinObservable;
}(Observable));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ForkJoinSubscriber = (function (_super) {
    __extends(ForkJoinSubscriber, _super);
    function ForkJoinSubscriber(destination, sources, resultSelector) {
        _super.call(this, destination);
        this.sources = sources;
        this.resultSelector = resultSelector;
        this.completed = 0;
        this.haveValues = 0;
        var len = sources.length;
        this.total = len;
        this.values = new Array(len);
        for (var i = 0; i < len; i++) {
            var source = sources[i];
            var innerSubscription = subscribeToResult(this, source, null, i);
            if (innerSubscription) {
                innerSubscription.outerIndex = i;
                this.add(innerSubscription);
            }
        }
    }
    ForkJoinSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.values[outerIndex] = innerValue;
        if (!innerSub._hasValue) {
            innerSub._hasValue = true;
            this.haveValues++;
        }
    };
    ForkJoinSubscriber.prototype.notifyComplete = function (innerSub) {
        var destination = this.destination;
        var _a = this, haveValues = _a.haveValues, resultSelector = _a.resultSelector, values = _a.values;
        var len = values.length;
        if (!innerSub._hasValue) {
            destination.complete();
            return;
        }
        this.completed++;
        if (this.completed !== len) {
            return;
        }
        if (haveValues === len) {
            var value = resultSelector ? resultSelector.apply(this, values) : values;
            destination.next(value);
        }
        destination.complete();
    };
    return ForkJoinSubscriber;
}(OuterSubscriber));

var forkJoin = ForkJoinObservable.create;

Observable.forkJoin = forkJoin;

Observable.from = from;

var toString = Object.prototype.toString;
function isNodeStyleEventEmitter(sourceObj) {
    return !!sourceObj && typeof sourceObj.addListener === 'function' && typeof sourceObj.removeListener === 'function';
}
function isJQueryStyleEventEmitter(sourceObj) {
    return !!sourceObj && typeof sourceObj.on === 'function' && typeof sourceObj.off === 'function';
}
function isNodeList(sourceObj) {
    return !!sourceObj && toString.call(sourceObj) === '[object NodeList]';
}
function isHTMLCollection(sourceObj) {
    return !!sourceObj && toString.call(sourceObj) === '[object HTMLCollection]';
}
function isEventTarget(sourceObj) {
    return !!sourceObj && typeof sourceObj.addEventListener === 'function' && typeof sourceObj.removeEventListener === 'function';
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var FromEventObservable = (function (_super) {
    __extends(FromEventObservable, _super);
    function FromEventObservable(sourceObj, eventName, selector, options) {
        _super.call(this);
        this.sourceObj = sourceObj;
        this.eventName = eventName;
        this.selector = selector;
        this.options = options;
    }
    /* tslint:enable:max-line-length */
    /**
     * Creates an Observable that emits events of a specific type coming from the
     * given event target.
     *
     * <span class="informal">Creates an Observable from DOM events, or Node.js
     * EventEmitter events or others.</span>
     *
     * <img src="./img/fromEvent.png" width="100%">
     *
     * `fromEvent` accepts as a first argument event target, which is an object with methods
     * for registering event handler functions. As a second argument it takes string that indicates
     * type of event we want to listen for. `fromEvent` supports selected types of event targets,
     * which are described in detail below. If your event target does not match any of the ones listed,
     * you should use {@link fromEventPattern}, which can be used on arbitrary APIs.
     * When it comes to APIs supported by `fromEvent`, their methods for adding and removing event
     * handler functions have different names, but they all accept a string describing event type
     * and function itself, which will be called whenever said event happens.
     *
     * Every time resulting Observable is subscribed, event handler function will be registered
     * to event target on given event type. When that event fires, value
     * passed as a first argument to registered function will be emitted by output Observable.
     * When Observable is unsubscribed, function will be unregistered from event target.
     *
     * Note that if event target calls registered function with more than one argument, second
     * and following arguments will not appear in resulting stream. In order to get access to them,
     * you can pass to `fromEvent` optional project function, which will be called with all arguments
     * passed to event handler. Output Observable will then emit value returned by project function,
     * instead of the usual value.
     *
     * Remember that event targets listed below are checked via duck typing. It means that
     * no matter what kind of object you have and no matter what environment you work in,
     * you can safely use `fromEvent` on that object if it exposes described methods (provided
     * of course they behave as was described above). So for example if Node.js library exposes
     * event target which has the same method names as DOM EventTarget, `fromEvent` is still
     * a good choice.
     *
     * If the API you use is more callback then event handler oriented (subscribed
     * callback function fires only once and thus there is no need to manually
     * unregister it), you should use {@link bindCallback} or {@link bindNodeCallback}
     * instead.
     *
     * `fromEvent` supports following types of event targets:
     *
     * **DOM EventTarget**
     *
     * This is an object with `addEventListener` and `removeEventListener` methods.
     *
     * In the browser, `addEventListener` accepts - apart from event type string and event
     * handler function arguments - optional third parameter, which is either an object or boolean,
     * both used for additional configuration how and when passed function will be called. When
     * `fromEvent` is used with event target of that type, you can provide this values
     * as third parameter as well.
     *
     * **Node.js EventEmitter**
     *
     * An object with `addListener` and `removeListener` methods.
     *
     * **JQuery-style event target**
     *
     * An object with `on` and `off` methods
     *
     * **DOM NodeList**
     *
     * List of DOM Nodes, returned for example by `document.querySelectorAll` or `Node.childNodes`.
     *
     * Although this collection is not event target in itself, `fromEvent` will iterate over all Nodes
     * it contains and install event handler function in every of them. When returned Observable
     * is unsubscribed, function will be removed from all Nodes.
     *
     * **DOM HtmlCollection**
     *
     * Just as in case of NodeList it is a collection of DOM nodes. Here as well event handler function is
     * installed and removed in each of elements.
     *
     *
     * @example <caption>Emits clicks happening on the DOM document</caption>
     * var clicks = Rx.Observable.fromEvent(document, 'click');
     * clicks.subscribe(x => console.log(x));
     *
     * // Results in:
     * // MouseEvent object logged to console every time a click
     * // occurs on the document.
     *
     *
     * @example <caption>Use addEventListener with capture option</caption>
     * var clicksInDocument = Rx.Observable.fromEvent(document, 'click', true); // note optional configuration parameter
     *                                                                          // which will be passed to addEventListener
     * var clicksInDiv = Rx.Observable.fromEvent(someDivInDocument, 'click');
     *
     * clicksInDocument.subscribe(() => console.log('document'));
     * clicksInDiv.subscribe(() => console.log('div'));
     *
     * // By default events bubble UP in DOM tree, so normally
     * // when we would click on div in document
     * // "div" would be logged first and then "document".
     * // Since we specified optional `capture` option, document
     * // will catch event when it goes DOWN DOM tree, so console
     * // will log "document" and then "div".
     *
     * @see {@link bindCallback}
     * @see {@link bindNodeCallback}
     * @see {@link fromEventPattern}
     *
     * @param {EventTargetLike} target The DOM EventTarget, Node.js
     * EventEmitter, JQuery-like event target, NodeList or HTMLCollection to attach the event handler to.
     * @param {string} eventName The event name of interest, being emitted by the
     * `target`.
     * @param {EventListenerOptions} [options] Options to pass through to addEventListener
     * @param {SelectorMethodSignature<T>} [selector] An optional function to
     * post-process results. It takes the arguments from the event handler and
     * should return a single value.
     * @return {Observable<T>}
     * @static true
     * @name fromEvent
     * @owner Observable
     */
    FromEventObservable.create = function (target, eventName, options, selector) {
        if (isFunction(options)) {
            selector = options;
            options = undefined;
        }
        return new FromEventObservable(target, eventName, selector, options);
    };
    FromEventObservable.setupSubscription = function (sourceObj, eventName, handler, subscriber, options) {
        var unsubscribe;
        if (isNodeList(sourceObj) || isHTMLCollection(sourceObj)) {
            for (var i = 0, len = sourceObj.length; i < len; i++) {
                FromEventObservable.setupSubscription(sourceObj[i], eventName, handler, subscriber, options);
            }
        }
        else if (isEventTarget(sourceObj)) {
            var source_1 = sourceObj;
            sourceObj.addEventListener(eventName, handler, options);
            unsubscribe = function () { return source_1.removeEventListener(eventName, handler, options); };
        }
        else if (isJQueryStyleEventEmitter(sourceObj)) {
            var source_2 = sourceObj;
            sourceObj.on(eventName, handler);
            unsubscribe = function () { return source_2.off(eventName, handler); };
        }
        else if (isNodeStyleEventEmitter(sourceObj)) {
            var source_3 = sourceObj;
            sourceObj.addListener(eventName, handler);
            unsubscribe = function () { return source_3.removeListener(eventName, handler); };
        }
        else {
            throw new TypeError('Invalid event target');
        }
        subscriber.add(new Subscription(unsubscribe));
    };
    /** @deprecated internal use only */ FromEventObservable.prototype._subscribe = function (subscriber) {
        var sourceObj = this.sourceObj;
        var eventName = this.eventName;
        var options = this.options;
        var selector = this.selector;
        var handler = selector ? function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i - 0] = arguments[_i];
            }
            var result = tryCatch(selector).apply(void 0, args);
            if (result === errorObject) {
                subscriber.error(errorObject.e);
            }
            else {
                subscriber.next(result);
            }
        } : function (e) { return subscriber.next(e); };
        FromEventObservable.setupSubscription(sourceObj, eventName, handler, subscriber, options);
    };
    return FromEventObservable;
}(Observable));

var fromEvent = FromEventObservable.create;

Observable.fromEvent = fromEvent;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var FromEventPatternObservable = (function (_super) {
    __extends(FromEventPatternObservable, _super);
    function FromEventPatternObservable(addHandler, removeHandler, selector) {
        _super.call(this);
        this.addHandler = addHandler;
        this.removeHandler = removeHandler;
        this.selector = selector;
    }
    /**
     * Creates an Observable from an API based on addHandler/removeHandler
     * functions.
     *
     * <span class="informal">Converts any addHandler/removeHandler API to an
     * Observable.</span>
     *
     * <img src="./img/fromEventPattern.png" width="100%">
     *
     * Creates an Observable by using the `addHandler` and `removeHandler`
     * functions to add and remove the handlers, with an optional selector
     * function to project the event arguments to a result. The `addHandler` is
     * called when the output Observable is subscribed, and `removeHandler` is
     * called when the Subscription is unsubscribed.
     *
     * @example <caption>Emits clicks happening on the DOM document</caption>
     * function addClickHandler(handler) {
     *   document.addEventListener('click', handler);
     * }
     *
     * function removeClickHandler(handler) {
     *   document.removeEventListener('click', handler);
     * }
     *
     * var clicks = Rx.Observable.fromEventPattern(
     *   addClickHandler,
     *   removeClickHandler
     * );
     * clicks.subscribe(x => console.log(x));
     *
     * @see {@link from}
     * @see {@link fromEvent}
     *
     * @param {function(handler: Function): any} addHandler A function that takes
     * a `handler` function as argument and attaches it somehow to the actual
     * source of events.
     * @param {function(handler: Function, signal?: any): void} [removeHandler] An optional function that
     * takes a `handler` function as argument and removes it in case it was
     * previously attached using `addHandler`. if addHandler returns signal to teardown when remove,
     * removeHandler function will forward it.
     * @param {function(...args: any): T} [selector] An optional function to
     * post-process results. It takes the arguments from the event handler and
     * should return a single value.
     * @return {Observable<T>}
     * @static true
     * @name fromEventPattern
     * @owner Observable
     */
    FromEventPatternObservable.create = function (addHandler, removeHandler, selector) {
        return new FromEventPatternObservable(addHandler, removeHandler, selector);
    };
    /** @deprecated internal use only */ FromEventPatternObservable.prototype._subscribe = function (subscriber) {
        var _this = this;
        var removeHandler = this.removeHandler;
        var handler = !!this.selector ? function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i - 0] = arguments[_i];
            }
            _this._callSelector(subscriber, args);
        } : function (e) { subscriber.next(e); };
        var retValue = this._callAddHandler(handler, subscriber);
        if (!isFunction(removeHandler)) {
            return;
        }
        subscriber.add(new Subscription(function () {
            //TODO: determine whether or not to forward to error handler
            removeHandler(handler, retValue);
        }));
    };
    FromEventPatternObservable.prototype._callSelector = function (subscriber, args) {
        try {
            var result = this.selector.apply(this, args);
            subscriber.next(result);
        }
        catch (e) {
            subscriber.error(e);
        }
    };
    FromEventPatternObservable.prototype._callAddHandler = function (handler, errorSubscriber) {
        try {
            return this.addHandler(handler) || null;
        }
        catch (e) {
            errorSubscriber.error(e);
        }
    };
    return FromEventPatternObservable;
}(Observable));

var fromEventPattern = FromEventPatternObservable.create;

Observable.fromEventPattern = fromEventPattern;

var fromPromise = PromiseObservable.create;

Observable.fromPromise = fromPromise;

var selfSelector = function (value) { return value; };
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var GenerateObservable = (function (_super) {
    __extends(GenerateObservable, _super);
    function GenerateObservable(initialState, condition, iterate, resultSelector, scheduler) {
        _super.call(this);
        this.initialState = initialState;
        this.condition = condition;
        this.iterate = iterate;
        this.resultSelector = resultSelector;
        this.scheduler = scheduler;
    }
    GenerateObservable.create = function (initialStateOrOptions, condition, iterate, resultSelectorOrObservable, scheduler) {
        if (arguments.length == 1) {
            return new GenerateObservable(initialStateOrOptions.initialState, initialStateOrOptions.condition, initialStateOrOptions.iterate, initialStateOrOptions.resultSelector || selfSelector, initialStateOrOptions.scheduler);
        }
        if (resultSelectorOrObservable === undefined || isScheduler(resultSelectorOrObservable)) {
            return new GenerateObservable(initialStateOrOptions, condition, iterate, selfSelector, resultSelectorOrObservable);
        }
        return new GenerateObservable(initialStateOrOptions, condition, iterate, resultSelectorOrObservable, scheduler);
    };
    /** @deprecated internal use only */ GenerateObservable.prototype._subscribe = function (subscriber) {
        var state = this.initialState;
        if (this.scheduler) {
            return this.scheduler.schedule(GenerateObservable.dispatch, 0, {
                subscriber: subscriber,
                iterate: this.iterate,
                condition: this.condition,
                resultSelector: this.resultSelector,
                state: state });
        }
        var _a = this, condition = _a.condition, resultSelector = _a.resultSelector, iterate = _a.iterate;
        do {
            if (condition) {
                var conditionResult = void 0;
                try {
                    conditionResult = condition(state);
                }
                catch (err) {
                    subscriber.error(err);
                    return;
                }
                if (!conditionResult) {
                    subscriber.complete();
                    break;
                }
            }
            var value = void 0;
            try {
                value = resultSelector(state);
            }
            catch (err) {
                subscriber.error(err);
                return;
            }
            subscriber.next(value);
            if (subscriber.closed) {
                break;
            }
            try {
                state = iterate(state);
            }
            catch (err) {
                subscriber.error(err);
                return;
            }
        } while (true);
    };
    GenerateObservable.dispatch = function (state) {
        var subscriber = state.subscriber, condition = state.condition;
        if (subscriber.closed) {
            return;
        }
        if (state.needIterate) {
            try {
                state.state = state.iterate(state.state);
            }
            catch (err) {
                subscriber.error(err);
                return;
            }
        }
        else {
            state.needIterate = true;
        }
        if (condition) {
            var conditionResult = void 0;
            try {
                conditionResult = condition(state.state);
            }
            catch (err) {
                subscriber.error(err);
                return;
            }
            if (!conditionResult) {
                subscriber.complete();
                return;
            }
            if (subscriber.closed) {
                return;
            }
        }
        var value;
        try {
            value = state.resultSelector(state.state);
        }
        catch (err) {
            subscriber.error(err);
            return;
        }
        if (subscriber.closed) {
            return;
        }
        subscriber.next(value);
        if (subscriber.closed) {
            return;
        }
        return this.schedule(state);
    };
    return GenerateObservable;
}(Observable));

var generate = GenerateObservable.create;

Observable.generate = generate;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var IfObservable = (function (_super) {
    __extends(IfObservable, _super);
    function IfObservable(condition, thenSource, elseSource) {
        _super.call(this);
        this.condition = condition;
        this.thenSource = thenSource;
        this.elseSource = elseSource;
    }
    IfObservable.create = function (condition, thenSource, elseSource) {
        return new IfObservable(condition, thenSource, elseSource);
    };
    /** @deprecated internal use only */ IfObservable.prototype._subscribe = function (subscriber) {
        var _a = this, condition = _a.condition, thenSource = _a.thenSource, elseSource = _a.elseSource;
        return new IfSubscriber(subscriber, condition, thenSource, elseSource);
    };
    return IfObservable;
}(Observable));
var IfSubscriber = (function (_super) {
    __extends(IfSubscriber, _super);
    function IfSubscriber(destination, condition, thenSource, elseSource) {
        _super.call(this, destination);
        this.condition = condition;
        this.thenSource = thenSource;
        this.elseSource = elseSource;
        this.tryIf();
    }
    IfSubscriber.prototype.tryIf = function () {
        var _a = this, condition = _a.condition, thenSource = _a.thenSource, elseSource = _a.elseSource;
        var result;
        try {
            result = condition();
            var source = result ? thenSource : elseSource;
            if (source) {
                this.add(subscribeToResult(this, source));
            }
            else {
                this._complete();
            }
        }
        catch (err) {
            this._error(err);
        }
    };
    return IfSubscriber;
}(OuterSubscriber));

var _if = IfObservable.create;

Observable.if = _if;

function isNumeric(val) {
    // parseFloat NaNs numeric-cast false positives (null|true|false|"")
    // ...but misinterprets leading-number strings, particularly hex literals ("0x...")
    // subtraction forces infinities to NaN
    // adding 1 corrects loss of precision from parseFloat (#15100)
    return !isArray(val) && (val - parseFloat(val) + 1) >= 0;
}

/**
 * A unit of work to be executed in a {@link Scheduler}. An action is typically
 * created from within a Scheduler and an RxJS user does not need to concern
 * themselves about creating and manipulating an Action.
 *
 * ```ts
 * class Action<T> extends Subscription {
 *   new (scheduler: Scheduler, work: (state?: T) => void);
 *   schedule(state?: T, delay: number = 0): Subscription;
 * }
 * ```
 *
 * @class Action<T>
 */
var Action = (function (_super) {
    __extends(Action, _super);
    function Action(scheduler, work) {
        _super.call(this);
    }
    /**
     * Schedules this action on its parent Scheduler for execution. May be passed
     * some context object, `state`. May happen at some point in the future,
     * according to the `delay` parameter, if specified.
     * @param {T} [state] Some contextual data that the `work` function uses when
     * called by the Scheduler.
     * @param {number} [delay] Time to wait before executing the work, where the
     * time unit is implicit and defined by the Scheduler.
     * @return {void}
     */
    Action.prototype.schedule = function (state, delay) {
        if (delay === void 0) { delay = 0; }
        return this;
    };
    return Action;
}(Subscription));

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var AsyncAction = (function (_super) {
    __extends(AsyncAction, _super);
    function AsyncAction(scheduler, work) {
        _super.call(this, scheduler, work);
        this.scheduler = scheduler;
        this.work = work;
        this.pending = false;
    }
    AsyncAction.prototype.schedule = function (state, delay) {
        if (delay === void 0) { delay = 0; }
        if (this.closed) {
            return this;
        }
        // Always replace the current state with the new state.
        this.state = state;
        // Set the pending flag indicating that this action has been scheduled, or
        // has recursively rescheduled itself.
        this.pending = true;
        var id = this.id;
        var scheduler = this.scheduler;
        //
        // Important implementation note:
        //
        // Actions only execute once by default, unless rescheduled from within the
        // scheduled callback. This allows us to implement single and repeat
        // actions via the same code path, without adding API surface area, as well
        // as mimic traditional recursion but across asynchronous boundaries.
        //
        // However, JS runtimes and timers distinguish between intervals achieved by
        // serial `setTimeout` calls vs. a single `setInterval` call. An interval of
        // serial `setTimeout` calls can be individually delayed, which delays
        // scheduling the next `setTimeout`, and so on. `setInterval` attempts to
        // guarantee the interval callback will be invoked more precisely to the
        // interval period, regardless of load.
        //
        // Therefore, we use `setInterval` to schedule single and repeat actions.
        // If the action reschedules itself with the same delay, the interval is not
        // canceled. If the action doesn't reschedule, or reschedules with a
        // different delay, the interval will be canceled after scheduled callback
        // execution.
        //
        if (id != null) {
            this.id = this.recycleAsyncId(scheduler, id, delay);
        }
        this.delay = delay;
        // If this action has already an async Id, don't request a new one.
        this.id = this.id || this.requestAsyncId(scheduler, this.id, delay);
        return this;
    };
    AsyncAction.prototype.requestAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        return _root.setInterval(scheduler.flush.bind(scheduler, this), delay);
    };
    AsyncAction.prototype.recycleAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        // If this action is rescheduled with the same delay time, don't clear the interval id.
        if (delay !== null && this.delay === delay && this.pending === false) {
            return id;
        }
        // Otherwise, if the action's delay time is different from the current delay,
        // or the action has been rescheduled before it's executed, clear the interval id
        return _root.clearInterval(id) && undefined || undefined;
    };
    /**
     * Immediately executes this action and the `work` it contains.
     * @return {any}
     */
    AsyncAction.prototype.execute = function (state, delay) {
        if (this.closed) {
            return new Error('executing a cancelled action');
        }
        this.pending = false;
        var error = this._execute(state, delay);
        if (error) {
            return error;
        }
        else if (this.pending === false && this.id != null) {
            // Dequeue if the action didn't reschedule itself. Don't call
            // unsubscribe(), because the action could reschedule later.
            // For example:
            // ```
            // scheduler.schedule(function doWork(counter) {
            //   /* ... I'm a busy worker bee ... */
            //   var originalAction = this;
            //   /* wait 100ms before rescheduling the action */
            //   setTimeout(function () {
            //     originalAction.schedule(counter + 1);
            //   }, 100);
            // }, 1000);
            // ```
            this.id = this.recycleAsyncId(this.scheduler, this.id, null);
        }
    };
    AsyncAction.prototype._execute = function (state, delay) {
        var errored = false;
        var errorValue = undefined;
        try {
            this.work(state);
        }
        catch (e) {
            errored = true;
            errorValue = !!e && e || new Error(e);
        }
        if (errored) {
            this.unsubscribe();
            return errorValue;
        }
    };
    /** @deprecated internal use only */ AsyncAction.prototype._unsubscribe = function () {
        var id = this.id;
        var scheduler = this.scheduler;
        var actions = scheduler.actions;
        var index = actions.indexOf(this);
        this.work = null;
        this.state = null;
        this.pending = false;
        this.scheduler = null;
        if (index !== -1) {
            actions.splice(index, 1);
        }
        if (id != null) {
            this.id = this.recycleAsyncId(scheduler, id, null);
        }
        this.delay = null;
    };
    return AsyncAction;
}(Action));

/**
 * An execution context and a data structure to order tasks and schedule their
 * execution. Provides a notion of (potentially virtual) time, through the
 * `now()` getter method.
 *
 * Each unit of work in a Scheduler is called an {@link Action}.
 *
 * ```ts
 * class Scheduler {
 *   now(): number;
 *   schedule(work, delay?, state?): Subscription;
 * }
 * ```
 *
 * @class Scheduler
 */
var Scheduler$1 = (function () {
    function Scheduler(SchedulerAction, now) {
        if (now === void 0) { now = Scheduler.now; }
        this.SchedulerAction = SchedulerAction;
        this.now = now;
    }
    /**
     * Schedules a function, `work`, for execution. May happen at some point in
     * the future, according to the `delay` parameter, if specified. May be passed
     * some context object, `state`, which will be passed to the `work` function.
     *
     * The given arguments will be processed an stored as an Action object in a
     * queue of actions.
     *
     * @param {function(state: ?T): ?Subscription} work A function representing a
     * task, or some unit of work to be executed by the Scheduler.
     * @param {number} [delay] Time to wait before executing the work, where the
     * time unit is implicit and defined by the Scheduler itself.
     * @param {T} [state] Some contextual data that the `work` function uses when
     * called by the Scheduler.
     * @return {Subscription} A subscription in order to be able to unsubscribe
     * the scheduled work.
     */
    Scheduler.prototype.schedule = function (work, delay, state) {
        if (delay === void 0) { delay = 0; }
        return new this.SchedulerAction(this, work).schedule(state, delay);
    };
    Scheduler.now = Date.now ? Date.now : function () { return +new Date(); };
    return Scheduler;
}());

var AsyncScheduler = (function (_super) {
    __extends(AsyncScheduler, _super);
    function AsyncScheduler() {
        _super.apply(this, arguments);
        this.actions = [];
        /**
         * A flag to indicate whether the Scheduler is currently executing a batch of
         * queued actions.
         * @type {boolean}
         */
        this.active = false;
        /**
         * An internal ID used to track the latest asynchronous task such as those
         * coming from `setTimeout`, `setInterval`, `requestAnimationFrame`, and
         * others.
         * @type {any}
         */
        this.scheduled = undefined;
    }
    AsyncScheduler.prototype.flush = function (action) {
        var actions = this.actions;
        if (this.active) {
            actions.push(action);
            return;
        }
        var error;
        this.active = true;
        do {
            if (error = action.execute(action.state, action.delay)) {
                break;
            }
        } while (action = actions.shift()); // exhaust the scheduler queue
        this.active = false;
        if (error) {
            while (action = actions.shift()) {
                action.unsubscribe();
            }
            throw error;
        }
    };
    return AsyncScheduler;
}(Scheduler$1));

/**
 *
 * Async Scheduler
 *
 * <span class="informal">Schedule task as if you used setTimeout(task, duration)</span>
 *
 * `async` scheduler schedules tasks asynchronously, by putting them on the JavaScript
 * event loop queue. It is best used to delay tasks in time or to schedule tasks repeating
 * in intervals.
 *
 * If you just want to "defer" task, that is to perform it right after currently
 * executing synchronous code ends (commonly achieved by `setTimeout(deferredTask, 0)`),
 * better choice will be the {@link asap} scheduler.
 *
 * @example <caption>Use async scheduler to delay task</caption>
 * const task = () => console.log('it works!');
 *
 * Rx.Scheduler.async.schedule(task, 2000);
 *
 * // After 2 seconds logs:
 * // "it works!"
 *
 *
 * @example <caption>Use async scheduler to repeat task in intervals</caption>
 * function task(state) {
 *   console.log(state);
 *   this.schedule(state + 1, 1000); // `this` references currently executing Action,
 *                                   // which we reschedule with new state and delay
 * }
 *
 * Rx.Scheduler.async.schedule(task, 3000, 0);
 *
 * // Logs:
 * // 0 after 3s
 * // 1 after 4s
 * // 2 after 5s
 * // 3 after 6s
 *
 * @static true
 * @name async
 * @owner Scheduler
 */
var async = new AsyncScheduler(AsyncAction);

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var IntervalObservable = (function (_super) {
    __extends(IntervalObservable, _super);
    function IntervalObservable(period, scheduler) {
        if (period === void 0) { period = 0; }
        if (scheduler === void 0) { scheduler = async; }
        _super.call(this);
        this.period = period;
        this.scheduler = scheduler;
        if (!isNumeric(period) || period < 0) {
            this.period = 0;
        }
        if (!scheduler || typeof scheduler.schedule !== 'function') {
            this.scheduler = async;
        }
    }
    /**
     * Creates an Observable that emits sequential numbers every specified
     * interval of time, on a specified IScheduler.
     *
     * <span class="informal">Emits incremental numbers periodically in time.
     * </span>
     *
     * <img src="./img/interval.png" width="100%">
     *
     * `interval` returns an Observable that emits an infinite sequence of
     * ascending integers, with a constant interval of time of your choosing
     * between those emissions. The first emission is not sent immediately, but
     * only after the first period has passed. By default, this operator uses the
     * `async` IScheduler to provide a notion of time, but you may pass any
     * IScheduler to it.
     *
     * @example <caption>Emits ascending numbers, one every second (1000ms)</caption>
     * var numbers = Rx.Observable.interval(1000);
     * numbers.subscribe(x => console.log(x));
     *
     * @see {@link timer}
     * @see {@link delay}
     *
     * @param {number} [period=0] The interval size in milliseconds (by default)
     * or the time unit determined by the scheduler's clock.
     * @param {Scheduler} [scheduler=async] The IScheduler to use for scheduling
     * the emission of values, and providing a notion of "time".
     * @return {Observable} An Observable that emits a sequential number each time
     * interval.
     * @static true
     * @name interval
     * @owner Observable
     */
    IntervalObservable.create = function (period, scheduler) {
        if (period === void 0) { period = 0; }
        if (scheduler === void 0) { scheduler = async; }
        return new IntervalObservable(period, scheduler);
    };
    IntervalObservable.dispatch = function (state) {
        var index = state.index, subscriber = state.subscriber, period = state.period;
        subscriber.next(index);
        if (subscriber.closed) {
            return;
        }
        state.index += 1;
        this.schedule(state, period);
    };
    /** @deprecated internal use only */ IntervalObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var period = this.period;
        var scheduler = this.scheduler;
        subscriber.add(scheduler.schedule(IntervalObservable.dispatch, period, {
            index: index, subscriber: subscriber, period: period
        }));
    };
    return IntervalObservable;
}(Observable));

var interval = IntervalObservable.create;

Observable.interval = interval;

/* tslint:enable:max-line-length */
/**
 * Creates an output Observable which concurrently emits all values from every
 * given input Observable.
 *
 * <span class="informal">Flattens multiple Observables together by blending
 * their values into one Observable.</span>
 *
 * <img src="./img/merge.png" width="100%">
 *
 * `merge` subscribes to each given input Observable (as arguments), and simply
 * forwards (without doing any transformation) all the values from all the input
 * Observables to the output Observable. The output Observable only completes
 * once all input Observables have completed. Any error delivered by an input
 * Observable will be immediately emitted on the output Observable.
 *
 * @example <caption>Merge together two Observables: 1s interval and clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var timer = Rx.Observable.interval(1000);
 * var clicksOrTimer = Rx.Observable.merge(clicks, timer);
 * clicksOrTimer.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // timer will emit ascending values, one every second(1000ms) to console
 * // clicks logs MouseEvents to console everytime the "document" is clicked
 * // Since the two streams are merged you see these happening
 * // as they occur.
 *
 * @example <caption>Merge together 3 Observables, but only 2 run concurrently</caption>
 * var timer1 = Rx.Observable.interval(1000).take(10);
 * var timer2 = Rx.Observable.interval(2000).take(6);
 * var timer3 = Rx.Observable.interval(500).take(10);
 * var concurrent = 2; // the argument
 * var merged = Rx.Observable.merge(timer1, timer2, timer3, concurrent);
 * merged.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // - First timer1 and timer2 will run concurrently
 * // - timer1 will emit a value every 1000ms for 10 iterations
 * // - timer2 will emit a value every 2000ms for 6 iterations
 * // - after timer1 hits it's max iteration, timer2 will
 * //   continue, and timer3 will start to run concurrently with timer2
 * // - when timer2 hits it's max iteration it terminates, and
 * //   timer3 will continue to emit a value every 500ms until it is complete
 *
 * @see {@link mergeAll}
 * @see {@link mergeMap}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 *
 * @param {...ObservableInput} observables Input Observables to merge together.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @param {Scheduler} [scheduler=null] The IScheduler to use for managing
 * concurrency of input Observables.
 * @return {Observable} an Observable that emits items that are the result of
 * every input Observable.
 * @static true
 * @name merge
 * @owner Observable
 */
function merge() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    var concurrent = Number.POSITIVE_INFINITY;
    var scheduler = null;
    var last = observables[observables.length - 1];
    if (isScheduler(last)) {
        scheduler = observables.pop();
        if (observables.length > 1 && typeof observables[observables.length - 1] === 'number') {
            concurrent = observables.pop();
        }
    }
    else if (typeof last === 'number') {
        concurrent = observables.pop();
    }
    if (scheduler === null && observables.length === 1 && observables[0] instanceof Observable) {
        return observables[0];
    }
    return mergeAll(concurrent)(new ArrayObservable(observables, scheduler));
}

Observable.merge = merge;

function race() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    // if the only argument is an array, it was most likely called with
    // `race([obs1, obs2, ...])`
    if (observables.length === 1) {
        if (isArray(observables[0])) {
            observables = observables[0];
        }
        else {
            return observables[0];
        }
    }
    return new ArrayObservable(observables).lift(new RaceOperator());
}
var RaceOperator = (function () {
    function RaceOperator() {
    }
    RaceOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new RaceSubscriber(subscriber));
    };
    return RaceOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var RaceSubscriber = (function (_super) {
    __extends(RaceSubscriber, _super);
    function RaceSubscriber(destination) {
        _super.call(this, destination);
        this.hasFirst = false;
        this.observables = [];
        this.subscriptions = [];
    }
    RaceSubscriber.prototype._next = function (observable) {
        this.observables.push(observable);
    };
    RaceSubscriber.prototype._complete = function () {
        var observables = this.observables;
        var len = observables.length;
        if (len === 0) {
            this.destination.complete();
        }
        else {
            for (var i = 0; i < len && !this.hasFirst; i++) {
                var observable = observables[i];
                var subscription = subscribeToResult(this, observable, observable, i);
                if (this.subscriptions) {
                    this.subscriptions.push(subscription);
                }
                this.add(subscription);
            }
            this.observables = null;
        }
    };
    RaceSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        if (!this.hasFirst) {
            this.hasFirst = true;
            for (var i = 0; i < this.subscriptions.length; i++) {
                if (i !== outerIndex) {
                    var subscription = this.subscriptions[i];
                    subscription.unsubscribe();
                    this.remove(subscription);
                }
            }
            this.subscriptions = null;
        }
        this.destination.next(innerValue);
    };
    return RaceSubscriber;
}(OuterSubscriber));

Observable.race = race;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var NeverObservable = (function (_super) {
    __extends(NeverObservable, _super);
    function NeverObservable() {
        _super.call(this);
    }
    /**
     * Creates an Observable that emits no items to the Observer.
     *
     * <span class="informal">An Observable that never emits anything.</span>
     *
     * <img src="./img/never.png" width="100%">
     *
     * This static operator is useful for creating a simple Observable that emits
     * neither values nor errors nor the completion notification. It can be used
     * for testing purposes or for composing with other Observables. Please note
     * that by never emitting a complete notification, this Observable keeps the
     * subscription from being disposed automatically. Subscriptions need to be
     * manually disposed.
     *
     * @example <caption>Emit the number 7, then never emit anything else (not even complete).</caption>
     * function info() {
     *   console.log('Will not be called');
     * }
     * var result = Rx.Observable.never().startWith(7);
     * result.subscribe(x => console.log(x), info, info);
     *
     * @see {@link create}
     * @see {@link empty}
     * @see {@link of}
     * @see {@link throw}
     *
     * @return {Observable} A "never" Observable: never emits anything.
     * @static true
     * @name never
     * @owner Observable
     */
    NeverObservable.create = function () {
        return new NeverObservable();
    };
    /** @deprecated internal use only */ NeverObservable.prototype._subscribe = function (subscriber) {
        noop();
    };
    return NeverObservable;
}(Observable));

var never = NeverObservable.create;

Observable.never = never;

Observable.of = of;

/* tslint:enable:max-line-length */
/**
 * When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one
 * that was passed.
 *
 * <span class="informal">Execute series of Observables no matter what, even if it means swallowing errors.</span>
 *
 * <img src="./img/onErrorResumeNext.png" width="100%">
 *
 * `onErrorResumeNext` is an operator that accepts a series of Observables, provided either directly as
 * arguments or as an array. If no single Observable is provided, returned Observable will simply behave the same
 * as the source.
 *
 * `onErrorResumeNext` returns an Observable that starts by subscribing and re-emitting values from the source Observable.
 * When its stream of values ends - no matter if Observable completed or emitted an error - `onErrorResumeNext`
 * will subscribe to the first Observable that was passed as an argument to the method. It will start re-emitting
 * its values as well and - again - when that stream ends, `onErrorResumeNext` will proceed to subscribing yet another
 * Observable in provided series, no matter if previous Observable completed or ended with an error. This will
 * be happening until there is no more Observables left in the series, at which point returned Observable will
 * complete - even if the last subscribed stream ended with an error.
 *
 * `onErrorResumeNext` can be therefore thought of as version of {@link concat} operator, which is more permissive
 * when it comes to the errors emitted by its input Observables. While `concat` subscribes to the next Observable
 * in series only if previous one successfully completed, `onErrorResumeNext` subscribes even if it ended with
 * an error.
 *
 * Note that you do not get any access to errors emitted by the Observables. In particular do not
 * expect these errors to appear in error callback passed to {@link subscribe}. If you want to take
 * specific actions based on what error was emitted by an Observable, you should try out {@link catch} instead.
 *
 *
 * @example <caption>Subscribe to the next Observable after map fails</caption>
 * Rx.Observable.of(1, 2, 3, 0)
 *   .map(x => {
 *       if (x === 0) { throw Error(); }
         return 10 / x;
 *   })
 *   .onErrorResumeNext(Rx.Observable.of(1, 2, 3))
 *   .subscribe(
 *     val => console.log(val),
 *     err => console.log(err),          // Will never be called.
 *     () => console.log('that\'s it!')
 *   );
 *
 * // Logs:
 * // 10
 * // 5
 * // 3.3333333333333335
 * // 1
 * // 2
 * // 3
 * // "that's it!"
 *
 * @see {@link concat}
 * @see {@link catch}
 *
 * @param {...ObservableInput} observables Observables passed either directly or as an array.
 * @return {Observable} An Observable that emits values from source Observable, but - if it errors - subscribes
 * to the next passed Observable and so on, until it completes or runs out of Observables.
 * @method onErrorResumeNext
 * @owner Observable
 */
function onErrorResumeNext$1() {
    var nextSources = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        nextSources[_i - 0] = arguments[_i];
    }
    if (nextSources.length === 1 && isArray(nextSources[0])) {
        nextSources = nextSources[0];
    }
    return function (source) { return source.lift(new OnErrorResumeNextOperator(nextSources)); };
}
/* tslint:enable:max-line-length */
function onErrorResumeNextStatic() {
    var nextSources = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        nextSources[_i - 0] = arguments[_i];
    }
    var source = null;
    if (nextSources.length === 1 && isArray(nextSources[0])) {
        nextSources = nextSources[0];
    }
    source = nextSources.shift();
    return new FromObservable(source, null).lift(new OnErrorResumeNextOperator(nextSources));
}
var OnErrorResumeNextOperator = (function () {
    function OnErrorResumeNextOperator(nextSources) {
        this.nextSources = nextSources;
    }
    OnErrorResumeNextOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new OnErrorResumeNextSubscriber(subscriber, this.nextSources));
    };
    return OnErrorResumeNextOperator;
}());
var OnErrorResumeNextSubscriber = (function (_super) {
    __extends(OnErrorResumeNextSubscriber, _super);
    function OnErrorResumeNextSubscriber(destination, nextSources) {
        _super.call(this, destination);
        this.destination = destination;
        this.nextSources = nextSources;
    }
    OnErrorResumeNextSubscriber.prototype.notifyError = function (error, innerSub) {
        this.subscribeToNextSource();
    };
    OnErrorResumeNextSubscriber.prototype.notifyComplete = function (innerSub) {
        this.subscribeToNextSource();
    };
    OnErrorResumeNextSubscriber.prototype._error = function (err) {
        this.subscribeToNextSource();
    };
    OnErrorResumeNextSubscriber.prototype._complete = function () {
        this.subscribeToNextSource();
    };
    OnErrorResumeNextSubscriber.prototype.subscribeToNextSource = function () {
        var next = this.nextSources.shift();
        if (next) {
            this.add(subscribeToResult(this, next));
        }
        else {
            this.destination.complete();
        }
    };
    return OnErrorResumeNextSubscriber;
}(OuterSubscriber));

var onErrorResumeNext$$1 = onErrorResumeNextStatic;

Observable.onErrorResumeNext = onErrorResumeNext$$1;

function dispatch$1(state) {
    var obj = state.obj, keys = state.keys, length = state.length, index = state.index, subscriber = state.subscriber;
    if (index === length) {
        subscriber.complete();
        return;
    }
    var key = keys[index];
    subscriber.next([key, obj[key]]);
    state.index = index + 1;
    this.schedule(state);
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var PairsObservable = (function (_super) {
    __extends(PairsObservable, _super);
    function PairsObservable(obj, scheduler) {
        _super.call(this);
        this.obj = obj;
        this.scheduler = scheduler;
        this.keys = Object.keys(obj);
    }
    /**
     * Convert an object into an observable sequence of [key, value] pairs
     * using an optional IScheduler to enumerate the object.
     *
     * @example <caption>Converts a javascript object to an Observable</caption>
     * var obj = {
     *   foo: 42,
     *   bar: 56,
     *   baz: 78
     * };
     *
     * var source = Rx.Observable.pairs(obj);
     *
     * var subscription = source.subscribe(
     *   function (x) {
     *     console.log('Next: %s', x);
     *   },
     *   function (err) {
     *     console.log('Error: %s', err);
     *   },
     *   function () {
     *     console.log('Completed');
     *   });
     *
     * @param {Object} obj The object to inspect and turn into an
     * Observable sequence.
     * @param {Scheduler} [scheduler] An optional IScheduler to run the
     * enumeration of the input sequence on.
     * @returns {(Observable<Array<string | T>>)} An observable sequence of
     * [key, value] pairs from the object.
     */
    PairsObservable.create = function (obj, scheduler) {
        return new PairsObservable(obj, scheduler);
    };
    /** @deprecated internal use only */ PairsObservable.prototype._subscribe = function (subscriber) {
        var _a = this, keys = _a.keys, scheduler = _a.scheduler;
        var length = keys.length;
        if (scheduler) {
            return scheduler.schedule(dispatch$1, 0, {
                obj: this.obj, keys: keys, length: length, index: 0, subscriber: subscriber
            });
        }
        else {
            for (var idx = 0; idx < length; idx++) {
                var key = keys[idx];
                subscriber.next([key, this.obj[key]]);
            }
            subscriber.complete();
        }
    };
    return PairsObservable;
}(Observable));

var pairs = PairsObservable.create;

Observable.pairs = pairs;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var RangeObservable = (function (_super) {
    __extends(RangeObservable, _super);
    function RangeObservable(start, count, scheduler) {
        _super.call(this);
        this.start = start;
        this._count = count;
        this.scheduler = scheduler;
    }
    /**
     * Creates an Observable that emits a sequence of numbers within a specified
     * range.
     *
     * <span class="informal">Emits a sequence of numbers in a range.</span>
     *
     * <img src="./img/range.png" width="100%">
     *
     * `range` operator emits a range of sequential integers, in order, where you
     * select the `start` of the range and its `length`. By default, uses no
     * IScheduler and just delivers the notifications synchronously, but may use
     * an optional IScheduler to regulate those deliveries.
     *
     * @example <caption>Emits the numbers 1 to 10</caption>
     * var numbers = Rx.Observable.range(1, 10);
     * numbers.subscribe(x => console.log(x));
     *
     * @see {@link timer}
     * @see {@link interval}
     *
     * @param {number} [start=0] The value of the first integer in the sequence.
     * @param {number} [count=0] The number of sequential integers to generate.
     * @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
     * the emissions of the notifications.
     * @return {Observable} An Observable of numbers that emits a finite range of
     * sequential integers.
     * @static true
     * @name range
     * @owner Observable
     */
    RangeObservable.create = function (start, count, scheduler) {
        if (start === void 0) { start = 0; }
        if (count === void 0) { count = 0; }
        return new RangeObservable(start, count, scheduler);
    };
    RangeObservable.dispatch = function (state) {
        var start = state.start, index = state.index, count = state.count, subscriber = state.subscriber;
        if (index >= count) {
            subscriber.complete();
            return;
        }
        subscriber.next(start);
        if (subscriber.closed) {
            return;
        }
        state.index = index + 1;
        state.start = start + 1;
        this.schedule(state);
    };
    /** @deprecated internal use only */ RangeObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var start = this.start;
        var count = this._count;
        var scheduler = this.scheduler;
        if (scheduler) {
            return scheduler.schedule(RangeObservable.dispatch, 0, {
                index: index, count: count, start: start, subscriber: subscriber
            });
        }
        else {
            do {
                if (index++ >= count) {
                    subscriber.complete();
                    break;
                }
                subscriber.next(start++);
                if (subscriber.closed) {
                    break;
                }
            } while (true);
        }
    };
    return RangeObservable;
}(Observable));

var range = RangeObservable.create;

Observable.range = range;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var UsingObservable = (function (_super) {
    __extends(UsingObservable, _super);
    function UsingObservable(resourceFactory, observableFactory) {
        _super.call(this);
        this.resourceFactory = resourceFactory;
        this.observableFactory = observableFactory;
    }
    UsingObservable.create = function (resourceFactory, observableFactory) {
        return new UsingObservable(resourceFactory, observableFactory);
    };
    /** @deprecated internal use only */ UsingObservable.prototype._subscribe = function (subscriber) {
        var _a = this, resourceFactory = _a.resourceFactory, observableFactory = _a.observableFactory;
        var resource;
        try {
            resource = resourceFactory();
            return new UsingSubscriber(subscriber, resource, observableFactory);
        }
        catch (err) {
            subscriber.error(err);
        }
    };
    return UsingObservable;
}(Observable));
var UsingSubscriber = (function (_super) {
    __extends(UsingSubscriber, _super);
    function UsingSubscriber(destination, resource, observableFactory) {
        _super.call(this, destination);
        this.resource = resource;
        this.observableFactory = observableFactory;
        destination.add(resource);
        this.tryUse();
    }
    UsingSubscriber.prototype.tryUse = function () {
        try {
            var source = this.observableFactory.call(this, this.resource);
            if (source) {
                this.add(subscribeToResult(this, source));
            }
        }
        catch (err) {
            this._error(err);
        }
    };
    return UsingSubscriber;
}(OuterSubscriber));

var using = UsingObservable.create;

Observable.using = using;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var ErrorObservable = (function (_super) {
    __extends(ErrorObservable, _super);
    function ErrorObservable(error, scheduler) {
        _super.call(this);
        this.error = error;
        this.scheduler = scheduler;
    }
    /**
     * Creates an Observable that emits no items to the Observer and immediately
     * emits an error notification.
     *
     * <span class="informal">Just emits 'error', and nothing else.
     * </span>
     *
     * <img src="./img/throw.png" width="100%">
     *
     * This static operator is useful for creating a simple Observable that only
     * emits the error notification. It can be used for composing with other
     * Observables, such as in a {@link mergeMap}.
     *
     * @example <caption>Emit the number 7, then emit an error.</caption>
     * var result = Rx.Observable.throw(new Error('oops!')).startWith(7);
     * result.subscribe(x => console.log(x), e => console.error(e));
     *
     * @example <caption>Map and flatten numbers to the sequence 'a', 'b', 'c', but throw an error for 13</caption>
     * var interval = Rx.Observable.interval(1000);
     * var result = interval.mergeMap(x =>
     *   x === 13 ?
     *     Rx.Observable.throw('Thirteens are bad') :
     *     Rx.Observable.of('a', 'b', 'c')
     * );
     * result.subscribe(x => console.log(x), e => console.error(e));
     *
     * @see {@link create}
     * @see {@link empty}
     * @see {@link never}
     * @see {@link of}
     *
     * @param {any} error The particular Error to pass to the error notification.
     * @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
     * the emission of the error notification.
     * @return {Observable} An error Observable: emits only the error notification
     * using the given error argument.
     * @static true
     * @name throw
     * @owner Observable
     */
    ErrorObservable.create = function (error, scheduler) {
        return new ErrorObservable(error, scheduler);
    };
    ErrorObservable.dispatch = function (arg) {
        var error = arg.error, subscriber = arg.subscriber;
        subscriber.error(error);
    };
    /** @deprecated internal use only */ ErrorObservable.prototype._subscribe = function (subscriber) {
        var error = this.error;
        var scheduler = this.scheduler;
        subscriber.syncErrorThrowable = true;
        if (scheduler) {
            return scheduler.schedule(ErrorObservable.dispatch, 0, {
                error: error, subscriber: subscriber
            });
        }
        else {
            subscriber.error(error);
        }
    };
    return ErrorObservable;
}(Observable));

var _throw = ErrorObservable.create;

Observable.throw = _throw;

function isDate(value) {
    return value instanceof Date && !isNaN(+value);
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var TimerObservable = (function (_super) {
    __extends(TimerObservable, _super);
    function TimerObservable(dueTime, period, scheduler) {
        if (dueTime === void 0) { dueTime = 0; }
        _super.call(this);
        this.period = -1;
        this.dueTime = 0;
        if (isNumeric(period)) {
            this.period = Number(period) < 1 && 1 || Number(period);
        }
        else if (isScheduler(period)) {
            scheduler = period;
        }
        if (!isScheduler(scheduler)) {
            scheduler = async;
        }
        this.scheduler = scheduler;
        this.dueTime = isDate(dueTime) ?
            (+dueTime - this.scheduler.now()) :
            dueTime;
    }
    /**
     * Creates an Observable that starts emitting after an `initialDelay` and
     * emits ever increasing numbers after each `period` of time thereafter.
     *
     * <span class="informal">Its like {@link interval}, but you can specify when
     * should the emissions start.</span>
     *
     * <img src="./img/timer.png" width="100%">
     *
     * `timer` returns an Observable that emits an infinite sequence of ascending
     * integers, with a constant interval of time, `period` of your choosing
     * between those emissions. The first emission happens after the specified
     * `initialDelay`. The initial delay may be a {@link Date}. By default, this
     * operator uses the `async` IScheduler to provide a notion of time, but you
     * may pass any IScheduler to it. If `period` is not specified, the output
     * Observable emits only one value, `0`. Otherwise, it emits an infinite
     * sequence.
     *
     * @example <caption>Emits ascending numbers, one every second (1000ms), starting after 3 seconds</caption>
     * var numbers = Rx.Observable.timer(3000, 1000);
     * numbers.subscribe(x => console.log(x));
     *
     * @example <caption>Emits one number after five seconds</caption>
     * var numbers = Rx.Observable.timer(5000);
     * numbers.subscribe(x => console.log(x));
     *
     * @see {@link interval}
     * @see {@link delay}
     *
     * @param {number|Date} initialDelay The initial delay time to wait before
     * emitting the first value of `0`.
     * @param {number} [period] The period of time between emissions of the
     * subsequent numbers.
     * @param {Scheduler} [scheduler=async] The IScheduler to use for scheduling
     * the emission of values, and providing a notion of "time".
     * @return {Observable} An Observable that emits a `0` after the
     * `initialDelay` and ever increasing numbers after each `period` of time
     * thereafter.
     * @static true
     * @name timer
     * @owner Observable
     */
    TimerObservable.create = function (initialDelay, period, scheduler) {
        if (initialDelay === void 0) { initialDelay = 0; }
        return new TimerObservable(initialDelay, period, scheduler);
    };
    TimerObservable.dispatch = function (state) {
        var index = state.index, period = state.period, subscriber = state.subscriber;
        var action = this;
        subscriber.next(index);
        if (subscriber.closed) {
            return;
        }
        else if (period === -1) {
            return subscriber.complete();
        }
        state.index = index + 1;
        action.schedule(state, period);
    };
    /** @deprecated internal use only */ TimerObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var _a = this, period = _a.period, dueTime = _a.dueTime, scheduler = _a.scheduler;
        return scheduler.schedule(TimerObservable.dispatch, dueTime, {
            index: index, period: period, subscriber: subscriber
        });
    };
    return TimerObservable;
}(Observable));

var timer = TimerObservable.create;

Observable.timer = timer;

/* tslint:enable:max-line-length */
/**
 * @param observables
 * @return {Observable<R>}
 * @method zip
 * @owner Observable
 */
function zip$1() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return function zipOperatorFunction(source) {
        return source.lift.call(zipStatic.apply(void 0, [source].concat(observables)));
    };
}
/* tslint:enable:max-line-length */
/**
 * Combines multiple Observables to create an Observable whose values are calculated from the values, in order, of each
 * of its input Observables.
 *
 * If the latest parameter is a function, this function is used to compute the created value from the input values.
 * Otherwise, an array of the input values is returned.
 *
 * @example <caption>Combine age and name from different sources</caption>
 *
 * let age$ = Observable.of<number>(27, 25, 29);
 * let name$ = Observable.of<string>('Foo', 'Bar', 'Beer');
 * let isDev$ = Observable.of<boolean>(true, true, false);
 *
 * Observable
 *     .zip(age$,
 *          name$,
 *          isDev$,
 *          (age: number, name: string, isDev: boolean) => ({ age, name, isDev }))
 *     .subscribe(x => console.log(x));
 *
 * // outputs
 * // { age: 27, name: 'Foo', isDev: true }
 * // { age: 25, name: 'Bar', isDev: true }
 * // { age: 29, name: 'Beer', isDev: false }
 *
 * @param observables
 * @return {Observable<R>}
 * @static true
 * @name zip
 * @owner Observable
 */
function zipStatic() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    var project = observables[observables.length - 1];
    if (typeof project === 'function') {
        observables.pop();
    }
    return new ArrayObservable(observables).lift(new ZipOperator(project));
}
var ZipOperator = (function () {
    function ZipOperator(project) {
        this.project = project;
    }
    ZipOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ZipSubscriber(subscriber, this.project));
    };
    return ZipOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ZipSubscriber = (function (_super) {
    __extends(ZipSubscriber, _super);
    function ZipSubscriber(destination, project, values) {
        if (values === void 0) { values = Object.create(null); }
        _super.call(this, destination);
        this.iterators = [];
        this.active = 0;
        this.project = (typeof project === 'function') ? project : null;
        this.values = values;
    }
    ZipSubscriber.prototype._next = function (value) {
        var iterators = this.iterators;
        if (isArray(value)) {
            iterators.push(new StaticArrayIterator(value));
        }
        else if (typeof value[iterator] === 'function') {
            iterators.push(new StaticIterator(value[iterator]()));
        }
        else {
            iterators.push(new ZipBufferIterator(this.destination, this, value));
        }
    };
    ZipSubscriber.prototype._complete = function () {
        var iterators = this.iterators;
        var len = iterators.length;
        if (len === 0) {
            this.destination.complete();
            return;
        }
        this.active = len;
        for (var i = 0; i < len; i++) {
            var iterator$$1 = iterators[i];
            if (iterator$$1.stillUnsubscribed) {
                this.add(iterator$$1.subscribe(iterator$$1, i));
            }
            else {
                this.active--; // not an observable
            }
        }
    };
    ZipSubscriber.prototype.notifyInactive = function () {
        this.active--;
        if (this.active === 0) {
            this.destination.complete();
        }
    };
    ZipSubscriber.prototype.checkIterators = function () {
        var iterators = this.iterators;
        var len = iterators.length;
        var destination = this.destination;
        // abort if not all of them have values
        for (var i = 0; i < len; i++) {
            var iterator$$1 = iterators[i];
            if (typeof iterator$$1.hasValue === 'function' && !iterator$$1.hasValue()) {
                return;
            }
        }
        var shouldComplete = false;
        var args = [];
        for (var i = 0; i < len; i++) {
            var iterator$$1 = iterators[i];
            var result = iterator$$1.next();
            // check to see if it's completed now that you've gotten
            // the next value.
            if (iterator$$1.hasCompleted()) {
                shouldComplete = true;
            }
            if (result.done) {
                destination.complete();
                return;
            }
            args.push(result.value);
        }
        if (this.project) {
            this._tryProject(args);
        }
        else {
            destination.next(args);
        }
        if (shouldComplete) {
            destination.complete();
        }
    };
    ZipSubscriber.prototype._tryProject = function (args) {
        var result;
        try {
            result = this.project.apply(this, args);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return ZipSubscriber;
}(Subscriber));
var StaticIterator = (function () {
    function StaticIterator(iterator$$1) {
        this.iterator = iterator$$1;
        this.nextResult = iterator$$1.next();
    }
    StaticIterator.prototype.hasValue = function () {
        return true;
    };
    StaticIterator.prototype.next = function () {
        var result = this.nextResult;
        this.nextResult = this.iterator.next();
        return result;
    };
    StaticIterator.prototype.hasCompleted = function () {
        var nextResult = this.nextResult;
        return nextResult && nextResult.done;
    };
    return StaticIterator;
}());
var StaticArrayIterator = (function () {
    function StaticArrayIterator(array) {
        this.array = array;
        this.index = 0;
        this.length = 0;
        this.length = array.length;
    }
    StaticArrayIterator.prototype[iterator] = function () {
        return this;
    };
    StaticArrayIterator.prototype.next = function (value) {
        var i = this.index++;
        var array = this.array;
        return i < this.length ? { value: array[i], done: false } : { value: null, done: true };
    };
    StaticArrayIterator.prototype.hasValue = function () {
        return this.array.length > this.index;
    };
    StaticArrayIterator.prototype.hasCompleted = function () {
        return this.array.length === this.index;
    };
    return StaticArrayIterator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ZipBufferIterator = (function (_super) {
    __extends(ZipBufferIterator, _super);
    function ZipBufferIterator(destination, parent, observable) {
        _super.call(this, destination);
        this.parent = parent;
        this.observable = observable;
        this.stillUnsubscribed = true;
        this.buffer = [];
        this.isComplete = false;
    }
    ZipBufferIterator.prototype[iterator] = function () {
        return this;
    };
    // NOTE: there is actually a name collision here with Subscriber.next and Iterator.next
    //    this is legit because `next()` will never be called by a subscription in this case.
    ZipBufferIterator.prototype.next = function () {
        var buffer = this.buffer;
        if (buffer.length === 0 && this.isComplete) {
            return { value: null, done: true };
        }
        else {
            return { value: buffer.shift(), done: false };
        }
    };
    ZipBufferIterator.prototype.hasValue = function () {
        return this.buffer.length > 0;
    };
    ZipBufferIterator.prototype.hasCompleted = function () {
        return this.buffer.length === 0 && this.isComplete;
    };
    ZipBufferIterator.prototype.notifyComplete = function () {
        if (this.buffer.length > 0) {
            this.isComplete = true;
            this.parent.notifyInactive();
        }
        else {
            this.destination.complete();
        }
    };
    ZipBufferIterator.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.buffer.push(innerValue);
        this.parent.checkIterators();
    };
    ZipBufferIterator.prototype.subscribe = function (value, index) {
        return subscribeToResult(this, this.observable, this, index);
    };
    return ZipBufferIterator;
}(OuterSubscriber));

var zip$$1 = zipStatic;

Observable.zip = zip$$1;

/**
 * Applies a given `project` function to each value emitted by the source
 * Observable, and emits the resulting values as an Observable.
 *
 * <span class="informal">Like [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map),
 * it passes each source value through a transformation function to get
 * corresponding output values.</span>
 *
 * <img src="./img/map.png" width="100%">
 *
 * Similar to the well known `Array.prototype.map` function, this operator
 * applies a projection to each value and emits that projection in the output
 * Observable.
 *
 * @example <caption>Map every click to the clientX position of that click</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var positions = clicks.map(ev => ev.clientX);
 * positions.subscribe(x => console.log(x));
 *
 * @see {@link mapTo}
 * @see {@link pluck}
 *
 * @param {function(value: T, index: number): R} project The function to apply
 * to each `value` emitted by the source Observable. The `index` parameter is
 * the number `i` for the i-th emission that has happened since the
 * subscription, starting from the number `0`.
 * @param {any} [thisArg] An optional argument to define what `this` is in the
 * `project` function.
 * @return {Observable<R>} An Observable that emits the values from the source
 * Observable transformed by the given `project` function.
 * @method map
 * @owner Observable
 */
function map(project, thisArg) {
    return function mapOperation(source) {
        if (typeof project !== 'function') {
            throw new TypeError('argument is not a function. Are you looking for `mapTo()`?');
        }
        return source.lift(new MapOperator(project, thisArg));
    };
}
var MapOperator = (function () {
    function MapOperator(project, thisArg) {
        this.project = project;
        this.thisArg = thisArg;
    }
    MapOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg));
    };
    return MapOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var MapSubscriber = (function (_super) {
    __extends(MapSubscriber, _super);
    function MapSubscriber(destination, project, thisArg) {
        _super.call(this, destination);
        this.project = project;
        this.count = 0;
        this.thisArg = thisArg || this;
    }
    // NOTE: This looks unoptimized, but it's actually purposefully NOT
    // using try/catch optimizations.
    MapSubscriber.prototype._next = function (value) {
        var result;
        try {
            result = this.project.call(this.thisArg, value, this.count++);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return MapSubscriber;
}(Subscriber));

function getCORSRequest() {
    if (_root.XMLHttpRequest) {
        return new _root.XMLHttpRequest();
    }
    else if (!!_root.XDomainRequest) {
        return new _root.XDomainRequest();
    }
    else {
        throw new Error('CORS is not supported by your browser');
    }
}
function getXMLHttpRequest() {
    if (_root.XMLHttpRequest) {
        return new _root.XMLHttpRequest();
    }
    else {
        var progId = void 0;
        try {
            var progIds = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];
            for (var i = 0; i < 3; i++) {
                try {
                    progId = progIds[i];
                    if (new _root.ActiveXObject(progId)) {
                        break;
                    }
                }
                catch (e) {
                }
            }
            return new _root.ActiveXObject(progId);
        }
        catch (e) {
            throw new Error('XMLHttpRequest is not supported by your browser');
        }
    }
}
function ajaxGet(url, headers) {
    if (headers === void 0) { headers = null; }
    return new AjaxObservable({ method: 'GET', url: url, headers: headers });
}

function ajaxPost(url, body, headers) {
    return new AjaxObservable({ method: 'POST', url: url, body: body, headers: headers });
}

function ajaxDelete(url, headers) {
    return new AjaxObservable({ method: 'DELETE', url: url, headers: headers });
}

function ajaxPut(url, body, headers) {
    return new AjaxObservable({ method: 'PUT', url: url, body: body, headers: headers });
}

function ajaxPatch(url, body, headers) {
    return new AjaxObservable({ method: 'PATCH', url: url, body: body, headers: headers });
}

var mapResponse = map(function (x, index) { return x.response; });
function ajaxGetJSON(url, headers) {
    return mapResponse(new AjaxObservable({
        method: 'GET',
        url: url,
        responseType: 'json',
        headers: headers
    }));
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var AjaxObservable = (function (_super) {
    __extends(AjaxObservable, _super);
    function AjaxObservable(urlOrRequest) {
        _super.call(this);
        var request = {
            async: true,
            createXHR: function () {
                return this.crossDomain ? getCORSRequest.call(this) : getXMLHttpRequest();
            },
            crossDomain: false,
            withCredentials: false,
            headers: {},
            method: 'GET',
            responseType: 'json',
            timeout: 0
        };
        if (typeof urlOrRequest === 'string') {
            request.url = urlOrRequest;
        }
        else {
            for (var prop in urlOrRequest) {
                if (urlOrRequest.hasOwnProperty(prop)) {
                    request[prop] = urlOrRequest[prop];
                }
            }
        }
        this.request = request;
    }
    /** @deprecated internal use only */ AjaxObservable.prototype._subscribe = function (subscriber) {
        return new AjaxSubscriber(subscriber, this.request);
    };
    /**
     * Creates an observable for an Ajax request with either a request object with
     * url, headers, etc or a string for a URL.
     *
     * @example
     * source = Rx.Observable.ajax('/products');
     * source = Rx.Observable.ajax({ url: 'products', method: 'GET' });
     *
     * @param {string|Object} request Can be one of the following:
     *   A string of the URL to make the Ajax call.
     *   An object with the following properties
     *   - url: URL of the request
     *   - body: The body of the request
     *   - method: Method of the request, such as GET, POST, PUT, PATCH, DELETE
     *   - async: Whether the request is async
     *   - headers: Optional headers
     *   - crossDomain: true if a cross domain request, else false
     *   - createXHR: a function to override if you need to use an alternate
     *   XMLHttpRequest implementation.
     *   - resultSelector: a function to use to alter the output value type of
     *   the Observable. Gets {@link AjaxResponse} as an argument.
     * @return {Observable} An observable sequence containing the XMLHttpRequest.
     * @static true
     * @name ajax
     * @owner Observable
    */
    AjaxObservable.create = (function () {
        var create = function (urlOrRequest) {
            return new AjaxObservable(urlOrRequest);
        };
        create.get = ajaxGet;
        create.post = ajaxPost;
        create.delete = ajaxDelete;
        create.put = ajaxPut;
        create.patch = ajaxPatch;
        create.getJSON = ajaxGetJSON;
        return create;
    })();
    return AjaxObservable;
}(Observable));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var AjaxSubscriber = (function (_super) {
    __extends(AjaxSubscriber, _super);
    function AjaxSubscriber(destination, request) {
        _super.call(this, destination);
        this.request = request;
        this.done = false;
        var headers = request.headers = request.headers || {};
        // force CORS if requested
        if (!request.crossDomain && !headers['X-Requested-With']) {
            headers['X-Requested-With'] = 'XMLHttpRequest';
        }
        // ensure content type is set
        if (!('Content-Type' in headers) && !(_root.FormData && request.body instanceof _root.FormData) && typeof request.body !== 'undefined') {
            headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';
        }
        // properly serialize body
        request.body = this.serializeBody(request.body, request.headers['Content-Type']);
        this.send();
    }
    AjaxSubscriber.prototype.next = function (e) {
        this.done = true;
        var _a = this, xhr = _a.xhr, request = _a.request, destination = _a.destination;
        var response = new AjaxResponse(e, xhr, request);
        destination.next(response);
    };
    AjaxSubscriber.prototype.send = function () {
        var _a = this, request = _a.request, _b = _a.request, user = _b.user, method = _b.method, url = _b.url, async = _b.async, password = _b.password, headers = _b.headers, body = _b.body;
        var createXHR = request.createXHR;
        var xhr = tryCatch(createXHR).call(request);
        if (xhr === errorObject) {
            this.error(errorObject.e);
        }
        else {
            this.xhr = xhr;
            // set up the events before open XHR
            // https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest
            // You need to add the event listeners before calling open() on the request.
            // Otherwise the progress events will not fire.
            this.setupEvents(xhr, request);
            // open XHR
            var result = void 0;
            if (user) {
                result = tryCatch(xhr.open).call(xhr, method, url, async, user, password);
            }
            else {
                result = tryCatch(xhr.open).call(xhr, method, url, async);
            }
            if (result === errorObject) {
                this.error(errorObject.e);
                return null;
            }
            // timeout, responseType and withCredentials can be set once the XHR is open
            if (async) {
                xhr.timeout = request.timeout;
                xhr.responseType = request.responseType;
            }
            if ('withCredentials' in xhr) {
                xhr.withCredentials = !!request.withCredentials;
            }
            // set headers
            this.setHeaders(xhr, headers);
            // finally send the request
            result = body ? tryCatch(xhr.send).call(xhr, body) : tryCatch(xhr.send).call(xhr);
            if (result === errorObject) {
                this.error(errorObject.e);
                return null;
            }
        }
        return xhr;
    };
    AjaxSubscriber.prototype.serializeBody = function (body, contentType) {
        if (!body || typeof body === 'string') {
            return body;
        }
        else if (_root.FormData && body instanceof _root.FormData) {
            return body;
        }
        if (contentType) {
            var splitIndex = contentType.indexOf(';');
            if (splitIndex !== -1) {
                contentType = contentType.substring(0, splitIndex);
            }
        }
        switch (contentType) {
            case 'application/x-www-form-urlencoded':
                return Object.keys(body).map(function (key) { return (encodeURI(key) + "=" + encodeURI(body[key])); }).join('&');
            case 'application/json':
                return JSON.stringify(body);
            default:
                return body;
        }
    };
    AjaxSubscriber.prototype.setHeaders = function (xhr, headers) {
        for (var key in headers) {
            if (headers.hasOwnProperty(key)) {
                xhr.setRequestHeader(key, headers[key]);
            }
        }
    };
    AjaxSubscriber.prototype.setupEvents = function (xhr, request) {
        var progressSubscriber = request.progressSubscriber;
        function xhrTimeout(e) {
            var _a = xhrTimeout, subscriber = _a.subscriber, progressSubscriber = _a.progressSubscriber, request = _a.request;
            if (progressSubscriber) {
                progressSubscriber.error(e);
            }
            subscriber.error(new AjaxTimeoutError(this, request)); //TODO: Make betterer.
        }
        
        xhr.ontimeout = xhrTimeout;
        xhrTimeout.request = request;
        xhrTimeout.subscriber = this;
        xhrTimeout.progressSubscriber = progressSubscriber;
        if (xhr.upload && 'withCredentials' in xhr) {
            if (progressSubscriber) {
                var xhrProgress_1;
                xhrProgress_1 = function (e) {
                    var progressSubscriber = xhrProgress_1.progressSubscriber;
                    progressSubscriber.next(e);
                };
                if (_root.XDomainRequest) {
                    xhr.onprogress = xhrProgress_1;
                }
                else {
                    xhr.upload.onprogress = xhrProgress_1;
                }
                xhrProgress_1.progressSubscriber = progressSubscriber;
            }
            var xhrError_1;
            xhrError_1 = function (e) {
                var _a = xhrError_1, progressSubscriber = _a.progressSubscriber, subscriber = _a.subscriber, request = _a.request;
                if (progressSubscriber) {
                    progressSubscriber.error(e);
                }
                subscriber.error(new AjaxError('ajax error', this, request));
            };
            xhr.onerror = xhrError_1;
            xhrError_1.request = request;
            xhrError_1.subscriber = this;
            xhrError_1.progressSubscriber = progressSubscriber;
        }
        function xhrReadyStateChange(e) {
            var _a = xhrReadyStateChange, subscriber = _a.subscriber, progressSubscriber = _a.progressSubscriber, request = _a.request;
            if (this.readyState === 4) {
                // normalize IE9 bug (http://bugs.jquery.com/ticket/1450)
                var status_1 = this.status === 1223 ? 204 : this.status;
                var response = (this.responseType === 'text' ? (this.response || this.responseText) : this.response);
                // fix status code when it is 0 (0 status is undocumented).
                // Occurs when accessing file resources or on Android 4.1 stock browser
                // while retrieving files from application cache.
                if (status_1 === 0) {
                    status_1 = response ? 200 : 0;
                }
                if (200 <= status_1 && status_1 < 300) {
                    if (progressSubscriber) {
                        progressSubscriber.complete();
                    }
                    subscriber.next(e);
                    subscriber.complete();
                }
                else {
                    if (progressSubscriber) {
                        progressSubscriber.error(e);
                    }
                    subscriber.error(new AjaxError('ajax error ' + status_1, this, request));
                }
            }
        }
        
        xhr.onreadystatechange = xhrReadyStateChange;
        xhrReadyStateChange.subscriber = this;
        xhrReadyStateChange.progressSubscriber = progressSubscriber;
        xhrReadyStateChange.request = request;
    };
    AjaxSubscriber.prototype.unsubscribe = function () {
        var _a = this, done = _a.done, xhr = _a.xhr;
        if (!done && xhr && xhr.readyState !== 4 && typeof xhr.abort === 'function') {
            xhr.abort();
        }
        _super.prototype.unsubscribe.call(this);
    };
    return AjaxSubscriber;
}(Subscriber));
/**
 * A normalized AJAX response.
 *
 * @see {@link ajax}
 *
 * @class AjaxResponse
 */
var AjaxResponse = (function () {
    function AjaxResponse(originalEvent, xhr, request) {
        this.originalEvent = originalEvent;
        this.xhr = xhr;
        this.request = request;
        this.status = xhr.status;
        this.responseType = xhr.responseType || request.responseType;
        this.response = parseXhrResponse(this.responseType, xhr);
    }
    return AjaxResponse;
}());
/**
 * A normalized AJAX error.
 *
 * @see {@link ajax}
 *
 * @class AjaxError
 */
var AjaxError = (function (_super) {
    __extends(AjaxError, _super);
    function AjaxError(message, xhr, request) {
        _super.call(this, message);
        this.message = message;
        this.xhr = xhr;
        this.request = request;
        this.status = xhr.status;
        this.responseType = xhr.responseType || request.responseType;
        this.response = parseXhrResponse(this.responseType, xhr);
    }
    return AjaxError;
}(Error));
function parseXhrResponse(responseType, xhr) {
    switch (responseType) {
        case 'json':
            if ('response' in xhr) {
                //IE does not support json as responseType, parse it internally
                return xhr.responseType ? xhr.response : JSON.parse(xhr.response || xhr.responseText || 'null');
            }
            else {
                // HACK(benlesh): TypeScript shennanigans
                // tslint:disable-next-line:no-any latest TS seems to think xhr is "never" here.
                return JSON.parse(xhr.responseText || 'null');
            }
        case 'xml':
            return xhr.responseXML;
        case 'text':
        default:
            // HACK(benlesh): TypeScript shennanigans
            // tslint:disable-next-line:no-any latest TS seems to think xhr is "never" here.
            return ('response' in xhr) ? xhr.response : xhr.responseText;
    }
}
/**
 * @see {@link ajax}
 *
 * @class AjaxTimeoutError
 */
var AjaxTimeoutError = (function (_super) {
    __extends(AjaxTimeoutError, _super);
    function AjaxTimeoutError(xhr, request) {
        _super.call(this, 'ajax timeout', xhr, request);
    }
    return AjaxTimeoutError;
}(AjaxError));

var ajax = AjaxObservable.create;

Observable.ajax = ajax;

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var QueueAction = (function (_super) {
    __extends(QueueAction, _super);
    function QueueAction(scheduler, work) {
        _super.call(this, scheduler, work);
        this.scheduler = scheduler;
        this.work = work;
    }
    QueueAction.prototype.schedule = function (state, delay) {
        if (delay === void 0) { delay = 0; }
        if (delay > 0) {
            return _super.prototype.schedule.call(this, state, delay);
        }
        this.delay = delay;
        this.state = state;
        this.scheduler.flush(this);
        return this;
    };
    QueueAction.prototype.execute = function (state, delay) {
        return (delay > 0 || this.closed) ?
            _super.prototype.execute.call(this, state, delay) :
            this._execute(state, delay);
    };
    QueueAction.prototype.requestAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        // If delay exists and is greater than 0, or if the delay is null (the
        // action wasn't rescheduled) but was originally scheduled as an async
        // action, then recycle as an async action.
        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {
            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);
        }
        // Otherwise flush the scheduler starting with this action.
        return scheduler.flush(this);
    };
    return QueueAction;
}(AsyncAction));

var QueueScheduler = (function (_super) {
    __extends(QueueScheduler, _super);
    function QueueScheduler() {
        _super.apply(this, arguments);
    }
    return QueueScheduler;
}(AsyncScheduler));

/**
 *
 * Queue Scheduler
 *
 * <span class="informal">Put every next task on a queue, instead of executing it immediately</span>
 *
 * `queue` scheduler, when used with delay, behaves the same as {@link async} scheduler.
 *
 * When used without delay, it schedules given task synchronously - executes it right when
 * it is scheduled. However when called recursively, that is when inside the scheduled task,
 * another task is scheduled with queue scheduler, instead of executing immediately as well,
 * that task will be put on a queue and wait for current one to finish.
 *
 * This means that when you execute task with `queue` scheduler, you are sure it will end
 * before any other task scheduled with that scheduler will start.
 *
 * @examples <caption>Schedule recursively first, then do something</caption>
 *
 * Rx.Scheduler.queue.schedule(() => {
 *   Rx.Scheduler.queue.schedule(() => console.log('second')); // will not happen now, but will be put on a queue
 *
 *   console.log('first');
 * });
 *
 * // Logs:
 * // "first"
 * // "second"
 *
 *
 * @example <caption>Reschedule itself recursively</caption>
 *
 * Rx.Scheduler.queue.schedule(function(state) {
 *   if (state !== 0) {
 *     console.log('before', state);
 *     this.schedule(state - 1); // `this` references currently executing Action,
 *                               // which we reschedule with new state
 *     console.log('after', state);
 *   }
 * }, 0, 3);
 *
 * // In scheduler that runs recursively, you would expect:
 * // "before", 3
 * // "before", 2
 * // "before", 1
 * // "after", 1
 * // "after", 2
 * // "after", 3
 *
 * // But with queue it logs:
 * // "before", 3
 * // "after", 3
 * // "before", 2
 * // "after", 2
 * // "before", 1
 * // "after", 1
 *
 *
 * @static true
 * @name queue
 * @owner Scheduler
 */
var queue = new QueueScheduler(QueueAction);

/**
 * @class ReplaySubject<T>
 */
var ReplaySubject = (function (_super) {
    __extends(ReplaySubject, _super);
    function ReplaySubject(bufferSize, windowTime, scheduler) {
        if (bufferSize === void 0) { bufferSize = Number.POSITIVE_INFINITY; }
        if (windowTime === void 0) { windowTime = Number.POSITIVE_INFINITY; }
        _super.call(this);
        this.scheduler = scheduler;
        this._events = [];
        this._bufferSize = bufferSize < 1 ? 1 : bufferSize;
        this._windowTime = windowTime < 1 ? 1 : windowTime;
    }
    ReplaySubject.prototype.next = function (value) {
        var now = this._getNow();
        this._events.push(new ReplayEvent(now, value));
        this._trimBufferThenGetEvents();
        _super.prototype.next.call(this, value);
    };
    /** @deprecated internal use only */ ReplaySubject.prototype._subscribe = function (subscriber) {
        var _events = this._trimBufferThenGetEvents();
        var scheduler = this.scheduler;
        var subscription;
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        else if (this.hasError) {
            subscription = Subscription.EMPTY;
        }
        else if (this.isStopped) {
            subscription = Subscription.EMPTY;
        }
        else {
            this.observers.push(subscriber);
            subscription = new SubjectSubscription(this, subscriber);
        }
        if (scheduler) {
            subscriber.add(subscriber = new ObserveOnSubscriber(subscriber, scheduler));
        }
        var len = _events.length;
        for (var i = 0; i < len && !subscriber.closed; i++) {
            subscriber.next(_events[i].value);
        }
        if (this.hasError) {
            subscriber.error(this.thrownError);
        }
        else if (this.isStopped) {
            subscriber.complete();
        }
        return subscription;
    };
    ReplaySubject.prototype._getNow = function () {
        return (this.scheduler || queue).now();
    };
    ReplaySubject.prototype._trimBufferThenGetEvents = function () {
        var now = this._getNow();
        var _bufferSize = this._bufferSize;
        var _windowTime = this._windowTime;
        var _events = this._events;
        var eventsCount = _events.length;
        var spliceCount = 0;
        // Trim events that fall out of the time window.
        // Start at the front of the list. Break early once
        // we encounter an event that falls within the window.
        while (spliceCount < eventsCount) {
            if ((now - _events[spliceCount].time) < _windowTime) {
                break;
            }
            spliceCount++;
        }
        if (eventsCount > _bufferSize) {
            spliceCount = Math.max(spliceCount, eventsCount - _bufferSize);
        }
        if (spliceCount > 0) {
            _events.splice(0, spliceCount);
        }
        return _events;
    };
    return ReplaySubject;
}(Subject));
var ReplayEvent = (function () {
    function ReplayEvent(time, value) {
        this.time = time;
        this.value = value;
    }
    return ReplayEvent;
}());

function assignImpl(target) {
    var sources = [];
    for (var _i = 1; _i < arguments.length; _i++) {
        sources[_i - 1] = arguments[_i];
    }
    var len = sources.length;
    for (var i = 0; i < len; i++) {
        var source = sources[i];
        for (var k in source) {
            if (source.hasOwnProperty(k)) {
                target[k] = source[k];
            }
        }
    }
    return target;
}

function getAssign(root$$1) {
    return root$$1.Object.assign || assignImpl;
}
var assign = getAssign(_root);

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var WebSocketSubject = (function (_super) {
    __extends(WebSocketSubject, _super);
    function WebSocketSubject(urlConfigOrSource, destination) {
        if (urlConfigOrSource instanceof Observable) {
            _super.call(this, destination, urlConfigOrSource);
        }
        else {
            _super.call(this);
            this.WebSocketCtor = _root.WebSocket;
            this._output = new Subject();
            if (typeof urlConfigOrSource === 'string') {
                this.url = urlConfigOrSource;
            }
            else {
                // WARNING: config object could override important members here.
                assign(this, urlConfigOrSource);
            }
            if (!this.WebSocketCtor) {
                throw new Error('no WebSocket constructor can be found');
            }
            this.destination = new ReplaySubject();
        }
    }
    WebSocketSubject.prototype.resultSelector = function (e) {
        return JSON.parse(e.data);
    };
    /**
     * Wrapper around the w3c-compatible WebSocket object provided by the browser.
     *
     * @example <caption>Wraps browser WebSocket</caption>
     *
     * let socket$ = Observable.webSocket('ws://localhost:8081');
     *
     * socket$.subscribe(
     *    (msg) => console.log('message received: ' + msg),
     *    (err) => console.log(err),
     *    () => console.log('complete')
     *  );
     *
     * socket$.next(JSON.stringify({ op: 'hello' }));
     *
     * @example <caption>Wraps WebSocket from nodejs-websocket (using node.js)</caption>
     *
     * import { w3cwebsocket } from 'websocket';
     *
     * let socket$ = Observable.webSocket({
     *   url: 'ws://localhost:8081',
     *   WebSocketCtor: w3cwebsocket
     * });
     *
     * socket$.subscribe(
     *    (msg) => console.log('message received: ' + msg),
     *    (err) => console.log(err),
     *    () => console.log('complete')
     *  );
     *
     * socket$.next(JSON.stringify({ op: 'hello' }));
     *
     * @param {string | WebSocketSubjectConfig} urlConfigOrSource the source of the websocket as an url or a structure defining the websocket object
     * @return {WebSocketSubject}
     * @static true
     * @name webSocket
     * @owner Observable
     */
    WebSocketSubject.create = function (urlConfigOrSource) {
        return new WebSocketSubject(urlConfigOrSource);
    };
    WebSocketSubject.prototype.lift = function (operator) {
        var sock = new WebSocketSubject(this, this.destination);
        sock.operator = operator;
        return sock;
    };
    WebSocketSubject.prototype._resetState = function () {
        this.socket = null;
        if (!this.source) {
            this.destination = new ReplaySubject();
        }
        this._output = new Subject();
    };
    // TODO: factor this out to be a proper Operator/Subscriber implementation and eliminate closures
    WebSocketSubject.prototype.multiplex = function (subMsg, unsubMsg, messageFilter) {
        var self = this;
        return new Observable(function (observer) {
            var result = tryCatch(subMsg)();
            if (result === errorObject) {
                observer.error(errorObject.e);
            }
            else {
                self.next(result);
            }
            var subscription = self.subscribe(function (x) {
                var result = tryCatch(messageFilter)(x);
                if (result === errorObject) {
                    observer.error(errorObject.e);
                }
                else if (result) {
                    observer.next(x);
                }
            }, function (err) { return observer.error(err); }, function () { return observer.complete(); });
            return function () {
                var result = tryCatch(unsubMsg)();
                if (result === errorObject) {
                    observer.error(errorObject.e);
                }
                else {
                    self.next(result);
                }
                subscription.unsubscribe();
            };
        });
    };
    WebSocketSubject.prototype._connectSocket = function () {
        var _this = this;
        var WebSocketCtor = this.WebSocketCtor;
        var observer = this._output;
        var socket = null;
        try {
            socket = this.protocol ?
                new WebSocketCtor(this.url, this.protocol) :
                new WebSocketCtor(this.url);
            this.socket = socket;
            if (this.binaryType) {
                this.socket.binaryType = this.binaryType;
            }
        }
        catch (e) {
            observer.error(e);
            return;
        }
        var subscription = new Subscription(function () {
            _this.socket = null;
            if (socket && socket.readyState === 1) {
                socket.close();
            }
        });
        socket.onopen = function (e) {
            var openObserver = _this.openObserver;
            if (openObserver) {
                openObserver.next(e);
            }
            var queue = _this.destination;
            _this.destination = Subscriber.create(function (x) { return socket.readyState === 1 && socket.send(x); }, function (e) {
                var closingObserver = _this.closingObserver;
                if (closingObserver) {
                    closingObserver.next(undefined);
                }
                if (e && e.code) {
                    socket.close(e.code, e.reason);
                }
                else {
                    observer.error(new TypeError('WebSocketSubject.error must be called with an object with an error code, ' +
                        'and an optional reason: { code: number, reason: string }'));
                }
                _this._resetState();
            }, function () {
                var closingObserver = _this.closingObserver;
                if (closingObserver) {
                    closingObserver.next(undefined);
                }
                socket.close();
                _this._resetState();
            });
            if (queue && queue instanceof ReplaySubject) {
                subscription.add(queue.subscribe(_this.destination));
            }
        };
        socket.onerror = function (e) {
            _this._resetState();
            observer.error(e);
        };
        socket.onclose = function (e) {
            _this._resetState();
            var closeObserver = _this.closeObserver;
            if (closeObserver) {
                closeObserver.next(e);
            }
            if (e.wasClean) {
                observer.complete();
            }
            else {
                observer.error(e);
            }
        };
        socket.onmessage = function (e) {
            var result = tryCatch(_this.resultSelector)(e);
            if (result === errorObject) {
                observer.error(errorObject.e);
            }
            else {
                observer.next(result);
            }
        };
    };
    /** @deprecated internal use only */ WebSocketSubject.prototype._subscribe = function (subscriber) {
        var _this = this;
        var source = this.source;
        if (source) {
            return source.subscribe(subscriber);
        }
        if (!this.socket) {
            this._connectSocket();
        }
        var subscription = new Subscription();
        subscription.add(this._output.subscribe(subscriber));
        subscription.add(function () {
            var socket = _this.socket;
            if (_this._output.observers.length === 0) {
                if (socket && socket.readyState === 1) {
                    socket.close();
                }
                _this._resetState();
            }
        });
        return subscription;
    };
    WebSocketSubject.prototype.unsubscribe = function () {
        var _a = this, source = _a.source, socket = _a.socket;
        if (socket && socket.readyState === 1) {
            socket.close();
            this._resetState();
        }
        _super.prototype.unsubscribe.call(this);
        if (!source) {
            this.destination = new ReplaySubject();
        }
    };
    return WebSocketSubject;
}(AnonymousSubject));

var webSocket = WebSocketSubject.create;

Observable.webSocket = webSocket;

/**
 * Buffers the source Observable values until `closingNotifier` emits.
 *
 * <span class="informal">Collects values from the past as an array, and emits
 * that array only when another Observable emits.</span>
 *
 * <img src="./img/buffer.png" width="100%">
 *
 * Buffers the incoming Observable values until the given `closingNotifier`
 * Observable emits a value, at which point it emits the buffer on the output
 * Observable and starts a new buffer internally, awaiting the next time
 * `closingNotifier` emits.
 *
 * @example <caption>On every click, emit array of most recent interval events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var interval = Rx.Observable.interval(1000);
 * var buffered = interval.buffer(clicks);
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link bufferCount}
 * @see {@link bufferTime}
 * @see {@link bufferToggle}
 * @see {@link bufferWhen}
 * @see {@link window}
 *
 * @param {Observable<any>} closingNotifier An Observable that signals the
 * buffer to be emitted on the output Observable.
 * @return {Observable<T[]>} An Observable of buffers, which are arrays of
 * values.
 * @method buffer
 * @owner Observable
 */
function buffer$1(closingNotifier) {
    return function bufferOperatorFunction(source) {
        return source.lift(new BufferOperator(closingNotifier));
    };
}
var BufferOperator = (function () {
    function BufferOperator(closingNotifier) {
        this.closingNotifier = closingNotifier;
    }
    BufferOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new BufferSubscriber(subscriber, this.closingNotifier));
    };
    return BufferOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var BufferSubscriber = (function (_super) {
    __extends(BufferSubscriber, _super);
    function BufferSubscriber(destination, closingNotifier) {
        _super.call(this, destination);
        this.buffer = [];
        this.add(subscribeToResult(this, closingNotifier));
    }
    BufferSubscriber.prototype._next = function (value) {
        this.buffer.push(value);
    };
    BufferSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var buffer = this.buffer;
        this.buffer = [];
        this.destination.next(buffer);
    };
    return BufferSubscriber;
}(OuterSubscriber));

/**
 * Buffers the source Observable values until `closingNotifier` emits.
 *
 * <span class="informal">Collects values from the past as an array, and emits
 * that array only when another Observable emits.</span>
 *
 * <img src="./img/buffer.png" width="100%">
 *
 * Buffers the incoming Observable values until the given `closingNotifier`
 * Observable emits a value, at which point it emits the buffer on the output
 * Observable and starts a new buffer internally, awaiting the next time
 * `closingNotifier` emits.
 *
 * @example <caption>On every click, emit array of most recent interval events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var interval = Rx.Observable.interval(1000);
 * var buffered = interval.buffer(clicks);
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link bufferCount}
 * @see {@link bufferTime}
 * @see {@link bufferToggle}
 * @see {@link bufferWhen}
 * @see {@link window}
 *
 * @param {Observable<any>} closingNotifier An Observable that signals the
 * buffer to be emitted on the output Observable.
 * @return {Observable<T[]>} An Observable of buffers, which are arrays of
 * values.
 * @method buffer
 * @owner Observable
 */
function buffer$$1(closingNotifier) {
    return buffer$1(closingNotifier)(this);
}

Observable.prototype.buffer = buffer$$1;

/**
 * Buffers the source Observable values until the size hits the maximum
 * `bufferSize` given.
 *
 * <span class="informal">Collects values from the past as an array, and emits
 * that array only when its size reaches `bufferSize`.</span>
 *
 * <img src="./img/bufferCount.png" width="100%">
 *
 * Buffers a number of values from the source Observable by `bufferSize` then
 * emits the buffer and clears it, and starts a new buffer each
 * `startBufferEvery` values. If `startBufferEvery` is not provided or is
 * `null`, then new buffers are started immediately at the start of the source
 * and when each buffer closes and is emitted.
 *
 * @example <caption>Emit the last two click events as an array</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferCount(2);
 * buffered.subscribe(x => console.log(x));
 *
 * @example <caption>On every click, emit the last two click events as an array</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferCount(2, 1);
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferTime}
 * @see {@link bufferToggle}
 * @see {@link bufferWhen}
 * @see {@link pairwise}
 * @see {@link windowCount}
 *
 * @param {number} bufferSize The maximum size of the buffer emitted.
 * @param {number} [startBufferEvery] Interval at which to start a new buffer.
 * For example if `startBufferEvery` is `2`, then a new buffer will be started
 * on every other value from the source. A new buffer is started at the
 * beginning of the source by default.
 * @return {Observable<T[]>} An Observable of arrays of buffered values.
 * @method bufferCount
 * @owner Observable
 */
function bufferCount$1(bufferSize, startBufferEvery) {
    if (startBufferEvery === void 0) { startBufferEvery = null; }
    return function bufferCountOperatorFunction(source) {
        return source.lift(new BufferCountOperator(bufferSize, startBufferEvery));
    };
}
var BufferCountOperator = (function () {
    function BufferCountOperator(bufferSize, startBufferEvery) {
        this.bufferSize = bufferSize;
        this.startBufferEvery = startBufferEvery;
        if (!startBufferEvery || bufferSize === startBufferEvery) {
            this.subscriberClass = BufferCountSubscriber;
        }
        else {
            this.subscriberClass = BufferSkipCountSubscriber;
        }
    }
    BufferCountOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new this.subscriberClass(subscriber, this.bufferSize, this.startBufferEvery));
    };
    return BufferCountOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var BufferCountSubscriber = (function (_super) {
    __extends(BufferCountSubscriber, _super);
    function BufferCountSubscriber(destination, bufferSize) {
        _super.call(this, destination);
        this.bufferSize = bufferSize;
        this.buffer = [];
    }
    BufferCountSubscriber.prototype._next = function (value) {
        var buffer = this.buffer;
        buffer.push(value);
        if (buffer.length == this.bufferSize) {
            this.destination.next(buffer);
            this.buffer = [];
        }
    };
    BufferCountSubscriber.prototype._complete = function () {
        var buffer = this.buffer;
        if (buffer.length > 0) {
            this.destination.next(buffer);
        }
        _super.prototype._complete.call(this);
    };
    return BufferCountSubscriber;
}(Subscriber));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var BufferSkipCountSubscriber = (function (_super) {
    __extends(BufferSkipCountSubscriber, _super);
    function BufferSkipCountSubscriber(destination, bufferSize, startBufferEvery) {
        _super.call(this, destination);
        this.bufferSize = bufferSize;
        this.startBufferEvery = startBufferEvery;
        this.buffers = [];
        this.count = 0;
    }
    BufferSkipCountSubscriber.prototype._next = function (value) {
        var _a = this, bufferSize = _a.bufferSize, startBufferEvery = _a.startBufferEvery, buffers = _a.buffers, count = _a.count;
        this.count++;
        if (count % startBufferEvery === 0) {
            buffers.push([]);
        }
        for (var i = buffers.length; i--;) {
            var buffer = buffers[i];
            buffer.push(value);
            if (buffer.length === bufferSize) {
                buffers.splice(i, 1);
                this.destination.next(buffer);
            }
        }
    };
    BufferSkipCountSubscriber.prototype._complete = function () {
        var _a = this, buffers = _a.buffers, destination = _a.destination;
        while (buffers.length > 0) {
            var buffer = buffers.shift();
            if (buffer.length > 0) {
                destination.next(buffer);
            }
        }
        _super.prototype._complete.call(this);
    };
    return BufferSkipCountSubscriber;
}(Subscriber));

/**
 * Buffers the source Observable values until the size hits the maximum
 * `bufferSize` given.
 *
 * <span class="informal">Collects values from the past as an array, and emits
 * that array only when its size reaches `bufferSize`.</span>
 *
 * <img src="./img/bufferCount.png" width="100%">
 *
 * Buffers a number of values from the source Observable by `bufferSize` then
 * emits the buffer and clears it, and starts a new buffer each
 * `startBufferEvery` values. If `startBufferEvery` is not provided or is
 * `null`, then new buffers are started immediately at the start of the source
 * and when each buffer closes and is emitted.
 *
 * @example <caption>Emit the last two click events as an array</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferCount(2);
 * buffered.subscribe(x => console.log(x));
 *
 * @example <caption>On every click, emit the last two click events as an array</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferCount(2, 1);
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferTime}
 * @see {@link bufferToggle}
 * @see {@link bufferWhen}
 * @see {@link pairwise}
 * @see {@link windowCount}
 *
 * @param {number} bufferSize The maximum size of the buffer emitted.
 * @param {number} [startBufferEvery] Interval at which to start a new buffer.
 * For example if `startBufferEvery` is `2`, then a new buffer will be started
 * on every other value from the source. A new buffer is started at the
 * beginning of the source by default.
 * @return {Observable<T[]>} An Observable of arrays of buffered values.
 * @method bufferCount
 * @owner Observable
 */
function bufferCount$$1(bufferSize, startBufferEvery) {
    if (startBufferEvery === void 0) { startBufferEvery = null; }
    return bufferCount$1(bufferSize, startBufferEvery)(this);
}

Observable.prototype.bufferCount = bufferCount$$1;

/* tslint:enable:max-line-length */
/**
 * Buffers the source Observable values for a specific time period.
 *
 * <span class="informal">Collects values from the past as an array, and emits
 * those arrays periodically in time.</span>
 *
 * <img src="./img/bufferTime.png" width="100%">
 *
 * Buffers values from the source for a specific time duration `bufferTimeSpan`.
 * Unless the optional argument `bufferCreationInterval` is given, it emits and
 * resets the buffer every `bufferTimeSpan` milliseconds. If
 * `bufferCreationInterval` is given, this operator opens the buffer every
 * `bufferCreationInterval` milliseconds and closes (emits and resets) the
 * buffer every `bufferTimeSpan` milliseconds. When the optional argument
 * `maxBufferSize` is specified, the buffer will be closed either after
 * `bufferTimeSpan` milliseconds or when it contains `maxBufferSize` elements.
 *
 * @example <caption>Every second, emit an array of the recent click events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferTime(1000);
 * buffered.subscribe(x => console.log(x));
 *
 * @example <caption>Every 5 seconds, emit the click events from the next 2 seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferTime(2000, 5000);
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 * @see {@link bufferToggle}
 * @see {@link bufferWhen}
 * @see {@link windowTime}
 *
 * @param {number} bufferTimeSpan The amount of time to fill each buffer array.
 * @param {number} [bufferCreationInterval] The interval at which to start new
 * buffers.
 * @param {number} [maxBufferSize] The maximum buffer size.
 * @param {Scheduler} [scheduler=async] The scheduler on which to schedule the
 * intervals that determine buffer boundaries.
 * @return {Observable<T[]>} An observable of arrays of buffered values.
 * @method bufferTime
 * @owner Observable
 */
function bufferTime$1(bufferTimeSpan) {
    var length = arguments.length;
    var scheduler = async;
    if (isScheduler(arguments[arguments.length - 1])) {
        scheduler = arguments[arguments.length - 1];
        length--;
    }
    var bufferCreationInterval = null;
    if (length >= 2) {
        bufferCreationInterval = arguments[1];
    }
    var maxBufferSize = Number.POSITIVE_INFINITY;
    if (length >= 3) {
        maxBufferSize = arguments[2];
    }
    return function bufferTimeOperatorFunction(source) {
        return source.lift(new BufferTimeOperator(bufferTimeSpan, bufferCreationInterval, maxBufferSize, scheduler));
    };
}
var BufferTimeOperator = (function () {
    function BufferTimeOperator(bufferTimeSpan, bufferCreationInterval, maxBufferSize, scheduler) {
        this.bufferTimeSpan = bufferTimeSpan;
        this.bufferCreationInterval = bufferCreationInterval;
        this.maxBufferSize = maxBufferSize;
        this.scheduler = scheduler;
    }
    BufferTimeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new BufferTimeSubscriber(subscriber, this.bufferTimeSpan, this.bufferCreationInterval, this.maxBufferSize, this.scheduler));
    };
    return BufferTimeOperator;
}());
var Context = (function () {
    function Context() {
        this.buffer = [];
    }
    return Context;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var BufferTimeSubscriber = (function (_super) {
    __extends(BufferTimeSubscriber, _super);
    function BufferTimeSubscriber(destination, bufferTimeSpan, bufferCreationInterval, maxBufferSize, scheduler) {
        _super.call(this, destination);
        this.bufferTimeSpan = bufferTimeSpan;
        this.bufferCreationInterval = bufferCreationInterval;
        this.maxBufferSize = maxBufferSize;
        this.scheduler = scheduler;
        this.contexts = [];
        var context = this.openContext();
        this.timespanOnly = bufferCreationInterval == null || bufferCreationInterval < 0;
        if (this.timespanOnly) {
            var timeSpanOnlyState = { subscriber: this, context: context, bufferTimeSpan: bufferTimeSpan };
            this.add(context.closeAction = scheduler.schedule(dispatchBufferTimeSpanOnly, bufferTimeSpan, timeSpanOnlyState));
        }
        else {
            var closeState = { subscriber: this, context: context };
            var creationState = { bufferTimeSpan: bufferTimeSpan, bufferCreationInterval: bufferCreationInterval, subscriber: this, scheduler: scheduler };
            this.add(context.closeAction = scheduler.schedule(dispatchBufferClose, bufferTimeSpan, closeState));
            this.add(scheduler.schedule(dispatchBufferCreation, bufferCreationInterval, creationState));
        }
    }
    BufferTimeSubscriber.prototype._next = function (value) {
        var contexts = this.contexts;
        var len = contexts.length;
        var filledBufferContext;
        for (var i = 0; i < len; i++) {
            var context = contexts[i];
            var buffer = context.buffer;
            buffer.push(value);
            if (buffer.length == this.maxBufferSize) {
                filledBufferContext = context;
            }
        }
        if (filledBufferContext) {
            this.onBufferFull(filledBufferContext);
        }
    };
    BufferTimeSubscriber.prototype._error = function (err) {
        this.contexts.length = 0;
        _super.prototype._error.call(this, err);
    };
    BufferTimeSubscriber.prototype._complete = function () {
        var _a = this, contexts = _a.contexts, destination = _a.destination;
        while (contexts.length > 0) {
            var context = contexts.shift();
            destination.next(context.buffer);
        }
        _super.prototype._complete.call(this);
    };
    /** @deprecated internal use only */ BufferTimeSubscriber.prototype._unsubscribe = function () {
        this.contexts = null;
    };
    BufferTimeSubscriber.prototype.onBufferFull = function (context) {
        this.closeContext(context);
        var closeAction = context.closeAction;
        closeAction.unsubscribe();
        this.remove(closeAction);
        if (!this.closed && this.timespanOnly) {
            context = this.openContext();
            var bufferTimeSpan = this.bufferTimeSpan;
            var timeSpanOnlyState = { subscriber: this, context: context, bufferTimeSpan: bufferTimeSpan };
            this.add(context.closeAction = this.scheduler.schedule(dispatchBufferTimeSpanOnly, bufferTimeSpan, timeSpanOnlyState));
        }
    };
    BufferTimeSubscriber.prototype.openContext = function () {
        var context = new Context();
        this.contexts.push(context);
        return context;
    };
    BufferTimeSubscriber.prototype.closeContext = function (context) {
        this.destination.next(context.buffer);
        var contexts = this.contexts;
        var spliceIndex = contexts ? contexts.indexOf(context) : -1;
        if (spliceIndex >= 0) {
            contexts.splice(contexts.indexOf(context), 1);
        }
    };
    return BufferTimeSubscriber;
}(Subscriber));
function dispatchBufferTimeSpanOnly(state) {
    var subscriber = state.subscriber;
    var prevContext = state.context;
    if (prevContext) {
        subscriber.closeContext(prevContext);
    }
    if (!subscriber.closed) {
        state.context = subscriber.openContext();
        state.context.closeAction = this.schedule(state, state.bufferTimeSpan);
    }
}
function dispatchBufferCreation(state) {
    var bufferCreationInterval = state.bufferCreationInterval, bufferTimeSpan = state.bufferTimeSpan, subscriber = state.subscriber, scheduler = state.scheduler;
    var context = subscriber.openContext();
    var action = this;
    if (!subscriber.closed) {
        subscriber.add(context.closeAction = scheduler.schedule(dispatchBufferClose, bufferTimeSpan, { subscriber: subscriber, context: context }));
        action.schedule(state, bufferCreationInterval);
    }
}
function dispatchBufferClose(arg) {
    var subscriber = arg.subscriber, context = arg.context;
    subscriber.closeContext(context);
}

/* tslint:enable:max-line-length */
/**
 * Buffers the source Observable values for a specific time period.
 *
 * <span class="informal">Collects values from the past as an array, and emits
 * those arrays periodically in time.</span>
 *
 * <img src="./img/bufferTime.png" width="100%">
 *
 * Buffers values from the source for a specific time duration `bufferTimeSpan`.
 * Unless the optional argument `bufferCreationInterval` is given, it emits and
 * resets the buffer every `bufferTimeSpan` milliseconds. If
 * `bufferCreationInterval` is given, this operator opens the buffer every
 * `bufferCreationInterval` milliseconds and closes (emits and resets) the
 * buffer every `bufferTimeSpan` milliseconds. When the optional argument
 * `maxBufferSize` is specified, the buffer will be closed either after
 * `bufferTimeSpan` milliseconds or when it contains `maxBufferSize` elements.
 *
 * @example <caption>Every second, emit an array of the recent click events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferTime(1000);
 * buffered.subscribe(x => console.log(x));
 *
 * @example <caption>Every 5 seconds, emit the click events from the next 2 seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferTime(2000, 5000);
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 * @see {@link bufferToggle}
 * @see {@link bufferWhen}
 * @see {@link windowTime}
 *
 * @param {number} bufferTimeSpan The amount of time to fill each buffer array.
 * @param {number} [bufferCreationInterval] The interval at which to start new
 * buffers.
 * @param {number} [maxBufferSize] The maximum buffer size.
 * @param {Scheduler} [scheduler=async] The scheduler on which to schedule the
 * intervals that determine buffer boundaries.
 * @return {Observable<T[]>} An observable of arrays of buffered values.
 * @method bufferTime
 * @owner Observable
 */
function bufferTime$$1(bufferTimeSpan) {
    var length = arguments.length;
    var scheduler = async;
    if (isScheduler(arguments[arguments.length - 1])) {
        scheduler = arguments[arguments.length - 1];
        length--;
    }
    var bufferCreationInterval = null;
    if (length >= 2) {
        bufferCreationInterval = arguments[1];
    }
    var maxBufferSize = Number.POSITIVE_INFINITY;
    if (length >= 3) {
        maxBufferSize = arguments[2];
    }
    return bufferTime$1(bufferTimeSpan, bufferCreationInterval, maxBufferSize, scheduler)(this);
}

Observable.prototype.bufferTime = bufferTime$$1;

/**
 * Buffers the source Observable values starting from an emission from
 * `openings` and ending when the output of `closingSelector` emits.
 *
 * <span class="informal">Collects values from the past as an array. Starts
 * collecting only when `opening` emits, and calls the `closingSelector`
 * function to get an Observable that tells when to close the buffer.</span>
 *
 * <img src="./img/bufferToggle.png" width="100%">
 *
 * Buffers values from the source by opening the buffer via signals from an
 * Observable provided to `openings`, and closing and sending the buffers when
 * a Subscribable or Promise returned by the `closingSelector` function emits.
 *
 * @example <caption>Every other second, emit the click events from the next 500ms</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var openings = Rx.Observable.interval(1000);
 * var buffered = clicks.bufferToggle(openings, i =>
 *   i % 2 ? Rx.Observable.interval(500) : Rx.Observable.empty()
 * );
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 * @see {@link bufferTime}
 * @see {@link bufferWhen}
 * @see {@link windowToggle}
 *
 * @param {SubscribableOrPromise<O>} openings A Subscribable or Promise of notifications to start new
 * buffers.
 * @param {function(value: O): SubscribableOrPromise} closingSelector A function that takes
 * the value emitted by the `openings` observable and returns a Subscribable or Promise,
 * which, when it emits, signals that the associated buffer should be emitted
 * and cleared.
 * @return {Observable<T[]>} An observable of arrays of buffered values.
 * @method bufferToggle
 * @owner Observable
 */
function bufferToggle$1(openings, closingSelector) {
    return function bufferToggleOperatorFunction(source) {
        return source.lift(new BufferToggleOperator(openings, closingSelector));
    };
}
var BufferToggleOperator = (function () {
    function BufferToggleOperator(openings, closingSelector) {
        this.openings = openings;
        this.closingSelector = closingSelector;
    }
    BufferToggleOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new BufferToggleSubscriber(subscriber, this.openings, this.closingSelector));
    };
    return BufferToggleOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var BufferToggleSubscriber = (function (_super) {
    __extends(BufferToggleSubscriber, _super);
    function BufferToggleSubscriber(destination, openings, closingSelector) {
        _super.call(this, destination);
        this.openings = openings;
        this.closingSelector = closingSelector;
        this.contexts = [];
        this.add(subscribeToResult(this, openings));
    }
    BufferToggleSubscriber.prototype._next = function (value) {
        var contexts = this.contexts;
        var len = contexts.length;
        for (var i = 0; i < len; i++) {
            contexts[i].buffer.push(value);
        }
    };
    BufferToggleSubscriber.prototype._error = function (err) {
        var contexts = this.contexts;
        while (contexts.length > 0) {
            var context = contexts.shift();
            context.subscription.unsubscribe();
            context.buffer = null;
            context.subscription = null;
        }
        this.contexts = null;
        _super.prototype._error.call(this, err);
    };
    BufferToggleSubscriber.prototype._complete = function () {
        var contexts = this.contexts;
        while (contexts.length > 0) {
            var context = contexts.shift();
            this.destination.next(context.buffer);
            context.subscription.unsubscribe();
            context.buffer = null;
            context.subscription = null;
        }
        this.contexts = null;
        _super.prototype._complete.call(this);
    };
    BufferToggleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        outerValue ? this.closeBuffer(outerValue) : this.openBuffer(innerValue);
    };
    BufferToggleSubscriber.prototype.notifyComplete = function (innerSub) {
        this.closeBuffer(innerSub.context);
    };
    BufferToggleSubscriber.prototype.openBuffer = function (value) {
        try {
            var closingSelector = this.closingSelector;
            var closingNotifier = closingSelector.call(this, value);
            if (closingNotifier) {
                this.trySubscribe(closingNotifier);
            }
        }
        catch (err) {
            this._error(err);
        }
    };
    BufferToggleSubscriber.prototype.closeBuffer = function (context) {
        var contexts = this.contexts;
        if (contexts && context) {
            var buffer = context.buffer, subscription = context.subscription;
            this.destination.next(buffer);
            contexts.splice(contexts.indexOf(context), 1);
            this.remove(subscription);
            subscription.unsubscribe();
        }
    };
    BufferToggleSubscriber.prototype.trySubscribe = function (closingNotifier) {
        var contexts = this.contexts;
        var buffer = [];
        var subscription = new Subscription();
        var context = { buffer: buffer, subscription: subscription };
        contexts.push(context);
        var innerSubscription = subscribeToResult(this, closingNotifier, context);
        if (!innerSubscription || innerSubscription.closed) {
            this.closeBuffer(context);
        }
        else {
            innerSubscription.context = context;
            this.add(innerSubscription);
            subscription.add(innerSubscription);
        }
    };
    return BufferToggleSubscriber;
}(OuterSubscriber));

/**
 * Buffers the source Observable values starting from an emission from
 * `openings` and ending when the output of `closingSelector` emits.
 *
 * <span class="informal">Collects values from the past as an array. Starts
 * collecting only when `opening` emits, and calls the `closingSelector`
 * function to get an Observable that tells when to close the buffer.</span>
 *
 * <img src="./img/bufferToggle.png" width="100%">
 *
 * Buffers values from the source by opening the buffer via signals from an
 * Observable provided to `openings`, and closing and sending the buffers when
 * a Subscribable or Promise returned by the `closingSelector` function emits.
 *
 * @example <caption>Every other second, emit the click events from the next 500ms</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var openings = Rx.Observable.interval(1000);
 * var buffered = clicks.bufferToggle(openings, i =>
 *   i % 2 ? Rx.Observable.interval(500) : Rx.Observable.empty()
 * );
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 * @see {@link bufferTime}
 * @see {@link bufferWhen}
 * @see {@link windowToggle}
 *
 * @param {SubscribableOrPromise<O>} openings A Subscribable or Promise of notifications to start new
 * buffers.
 * @param {function(value: O): SubscribableOrPromise} closingSelector A function that takes
 * the value emitted by the `openings` observable and returns a Subscribable or Promise,
 * which, when it emits, signals that the associated buffer should be emitted
 * and cleared.
 * @return {Observable<T[]>} An observable of arrays of buffered values.
 * @method bufferToggle
 * @owner Observable
 */
function bufferToggle$$1(openings, closingSelector) {
    return bufferToggle$1(openings, closingSelector)(this);
}

Observable.prototype.bufferToggle = bufferToggle$$1;

/**
 * Buffers the source Observable values, using a factory function of closing
 * Observables to determine when to close, emit, and reset the buffer.
 *
 * <span class="informal">Collects values from the past as an array. When it
 * starts collecting values, it calls a function that returns an Observable that
 * tells when to close the buffer and restart collecting.</span>
 *
 * <img src="./img/bufferWhen.png" width="100%">
 *
 * Opens a buffer immediately, then closes the buffer when the observable
 * returned by calling `closingSelector` function emits a value. When it closes
 * the buffer, it immediately opens a new buffer and repeats the process.
 *
 * @example <caption>Emit an array of the last clicks every [1-5] random seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferWhen(() =>
 *   Rx.Observable.interval(1000 + Math.random() * 4000)
 * );
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 * @see {@link bufferTime}
 * @see {@link bufferToggle}
 * @see {@link windowWhen}
 *
 * @param {function(): Observable} closingSelector A function that takes no
 * arguments and returns an Observable that signals buffer closure.
 * @return {Observable<T[]>} An observable of arrays of buffered values.
 * @method bufferWhen
 * @owner Observable
 */
function bufferWhen$1(closingSelector) {
    return function (source) {
        return source.lift(new BufferWhenOperator(closingSelector));
    };
}
var BufferWhenOperator = (function () {
    function BufferWhenOperator(closingSelector) {
        this.closingSelector = closingSelector;
    }
    BufferWhenOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new BufferWhenSubscriber(subscriber, this.closingSelector));
    };
    return BufferWhenOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var BufferWhenSubscriber = (function (_super) {
    __extends(BufferWhenSubscriber, _super);
    function BufferWhenSubscriber(destination, closingSelector) {
        _super.call(this, destination);
        this.closingSelector = closingSelector;
        this.subscribing = false;
        this.openBuffer();
    }
    BufferWhenSubscriber.prototype._next = function (value) {
        this.buffer.push(value);
    };
    BufferWhenSubscriber.prototype._complete = function () {
        var buffer = this.buffer;
        if (buffer) {
            this.destination.next(buffer);
        }
        _super.prototype._complete.call(this);
    };
    /** @deprecated internal use only */ BufferWhenSubscriber.prototype._unsubscribe = function () {
        this.buffer = null;
        this.subscribing = false;
    };
    BufferWhenSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.openBuffer();
    };
    BufferWhenSubscriber.prototype.notifyComplete = function () {
        if (this.subscribing) {
            this.complete();
        }
        else {
            this.openBuffer();
        }
    };
    BufferWhenSubscriber.prototype.openBuffer = function () {
        var closingSubscription = this.closingSubscription;
        if (closingSubscription) {
            this.remove(closingSubscription);
            closingSubscription.unsubscribe();
        }
        var buffer = this.buffer;
        if (this.buffer) {
            this.destination.next(buffer);
        }
        this.buffer = [];
        var closingNotifier = tryCatch(this.closingSelector)();
        if (closingNotifier === errorObject) {
            this.error(errorObject.e);
        }
        else {
            closingSubscription = new Subscription();
            this.closingSubscription = closingSubscription;
            this.add(closingSubscription);
            this.subscribing = true;
            closingSubscription.add(subscribeToResult(this, closingNotifier));
            this.subscribing = false;
        }
    };
    return BufferWhenSubscriber;
}(OuterSubscriber));

/**
 * Buffers the source Observable values, using a factory function of closing
 * Observables to determine when to close, emit, and reset the buffer.
 *
 * <span class="informal">Collects values from the past as an array. When it
 * starts collecting values, it calls a function that returns an Observable that
 * tells when to close the buffer and restart collecting.</span>
 *
 * <img src="./img/bufferWhen.png" width="100%">
 *
 * Opens a buffer immediately, then closes the buffer when the observable
 * returned by calling `closingSelector` function emits a value. When it closes
 * the buffer, it immediately opens a new buffer and repeats the process.
 *
 * @example <caption>Emit an array of the last clicks every [1-5] random seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var buffered = clicks.bufferWhen(() =>
 *   Rx.Observable.interval(1000 + Math.random() * 4000)
 * );
 * buffered.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 * @see {@link bufferTime}
 * @see {@link bufferToggle}
 * @see {@link windowWhen}
 *
 * @param {function(): Observable} closingSelector A function that takes no
 * arguments and returns an Observable that signals buffer closure.
 * @return {Observable<T[]>} An observable of arrays of buffered values.
 * @method bufferWhen
 * @owner Observable
 */
function bufferWhen$$1(closingSelector) {
    return bufferWhen$1(closingSelector)(this);
}

Observable.prototype.bufferWhen = bufferWhen$$1;

/**
 * Catches errors on the observable to be handled by returning a new observable or throwing an error.
 *
 * <img src="./img/catch.png" width="100%">
 *
 * @example <caption>Continues with a different Observable when there's an error</caption>
 *
 * Observable.of(1, 2, 3, 4, 5)
 *   .map(n => {
 * 	   if (n == 4) {
 * 	     throw 'four!';
 *     }
 *	   return n;
 *   })
 *   .catch(err => Observable.of('I', 'II', 'III', 'IV', 'V'))
 *   .subscribe(x => console.log(x));
 *   // 1, 2, 3, I, II, III, IV, V
 *
 * @example <caption>Retries the caught source Observable again in case of error, similar to retry() operator</caption>
 *
 * Observable.of(1, 2, 3, 4, 5)
 *   .map(n => {
 * 	   if (n === 4) {
 * 	     throw 'four!';
 *     }
 * 	   return n;
 *   })
 *   .catch((err, caught) => caught)
 *   .take(30)
 *   .subscribe(x => console.log(x));
 *   // 1, 2, 3, 1, 2, 3, ...
 *
 * @example <caption>Throws a new error when the source Observable throws an error</caption>
 *
 * Observable.of(1, 2, 3, 4, 5)
 *   .map(n => {
 *     if (n == 4) {
 *       throw 'four!';
 *     }
 *     return n;
 *   })
 *   .catch(err => {
 *     throw 'error in source. Details: ' + err;
 *   })
 *   .subscribe(
 *     x => console.log(x),
 *     err => console.log(err)
 *   );
 *   // 1, 2, 3, error in source. Details: four!
 *
 * @param {function} selector a function that takes as arguments `err`, which is the error, and `caught`, which
 *  is the source observable, in case you'd like to "retry" that observable by returning it again. Whatever observable
 *  is returned by the `selector` will be used to continue the observable chain.
 * @return {Observable} An observable that originates from either the source or the observable returned by the
 *  catch `selector` function.
 * @name catchError
 */
function catchError(selector) {
    return function catchErrorOperatorFunction(source) {
        var operator = new CatchOperator(selector);
        var caught = source.lift(operator);
        return (operator.caught = caught);
    };
}
var CatchOperator = (function () {
    function CatchOperator(selector) {
        this.selector = selector;
    }
    CatchOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new CatchSubscriber(subscriber, this.selector, this.caught));
    };
    return CatchOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var CatchSubscriber = (function (_super) {
    __extends(CatchSubscriber, _super);
    function CatchSubscriber(destination, selector, caught) {
        _super.call(this, destination);
        this.selector = selector;
        this.caught = caught;
    }
    // NOTE: overriding `error` instead of `_error` because we don't want
    // to have this flag this subscriber as `isStopped`. We can mimic the
    // behavior of the RetrySubscriber (from the `retry` operator), where
    // we unsubscribe from our source chain, reset our Subscriber flags,
    // then subscribe to the selector result.
    CatchSubscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            var result = void 0;
            try {
                result = this.selector(err, this.caught);
            }
            catch (err2) {
                _super.prototype.error.call(this, err2);
                return;
            }
            this._unsubscribeAndRecycle();
            this.add(subscribeToResult(this, result));
        }
    };
    return CatchSubscriber;
}(OuterSubscriber));

/**
 * Catches errors on the observable to be handled by returning a new observable or throwing an error.
 *
 * <img src="./img/catch.png" width="100%">
 *
 * @example <caption>Continues with a different Observable when there's an error</caption>
 *
 * Observable.of(1, 2, 3, 4, 5)
 *   .map(n => {
 * 	   if (n == 4) {
 * 	     throw 'four!';
 *     }
 *	   return n;
 *   })
 *   .catch(err => Observable.of('I', 'II', 'III', 'IV', 'V'))
 *   .subscribe(x => console.log(x));
 *   // 1, 2, 3, I, II, III, IV, V
 *
 * @example <caption>Retries the caught source Observable again in case of error, similar to retry() operator</caption>
 *
 * Observable.of(1, 2, 3, 4, 5)
 *   .map(n => {
 * 	   if (n === 4) {
 * 	     throw 'four!';
 *     }
 * 	   return n;
 *   })
 *   .catch((err, caught) => caught)
 *   .take(30)
 *   .subscribe(x => console.log(x));
 *   // 1, 2, 3, 1, 2, 3, ...
 *
 * @example <caption>Throws a new error when the source Observable throws an error</caption>
 *
 * Observable.of(1, 2, 3, 4, 5)
 *   .map(n => {
 *     if (n == 4) {
 *       throw 'four!';
 *     }
 *     return n;
 *   })
 *   .catch(err => {
 *     throw 'error in source. Details: ' + err;
 *   })
 *   .subscribe(
 *     x => console.log(x),
 *     err => console.log(err)
 *   );
 *   // 1, 2, 3, error in source. Details: four!
 *
 * @param {function} selector a function that takes as arguments `err`, which is the error, and `caught`, which
 *  is the source observable, in case you'd like to "retry" that observable by returning it again. Whatever observable
 *  is returned by the `selector` will be used to continue the observable chain.
 * @return {Observable} An observable that originates from either the source or the observable returned by the
 *  catch `selector` function.
 * @method catch
 * @name catch
 * @owner Observable
 */
function _catch(selector) {
    return catchError(selector)(this);
}

Observable.prototype.catch = _catch;
Observable.prototype._catch = _catch;

function combineAll$1(project) {
    return function (source) { return source.lift(new CombineLatestOperator(project)); };
}

/**
 * Converts a higher-order Observable into a first-order Observable by waiting
 * for the outer Observable to complete, then applying {@link combineLatest}.
 *
 * <span class="informal">Flattens an Observable-of-Observables by applying
 * {@link combineLatest} when the Observable-of-Observables completes.</span>
 *
 * <img src="./img/combineAll.png" width="100%">
 *
 * Takes an Observable of Observables, and collects all Observables from it.
 * Once the outer Observable completes, it subscribes to all collected
 * Observables and combines their values using the {@link combineLatest}
 * strategy, such that:
 * - Every time an inner Observable emits, the output Observable emits.
 * - When the returned observable emits, it emits all of the latest values by:
 *   - If a `project` function is provided, it is called with each recent value
 *     from each inner Observable in whatever order they arrived, and the result
 *     of the `project` function is what is emitted by the output Observable.
 *   - If there is no `project` function, an array of all of the most recent
 *     values is emitted by the output Observable.
 *
 * @example <caption>Map two click events to a finite interval Observable, then apply combineAll</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map(ev =>
 *   Rx.Observable.interval(Math.random()*2000).take(3)
 * ).take(2);
 * var result = higherOrder.combineAll();
 * result.subscribe(x => console.log(x));
 *
 * @see {@link combineLatest}
 * @see {@link mergeAll}
 *
 * @param {function} [project] An optional function to map the most recent
 * values from each inner Observable into a new result. Takes each of the most
 * recent values from each collected inner Observable as arguments, in order.
 * @return {Observable} An Observable of projected results or arrays of recent
 * values.
 * @method combineAll
 * @owner Observable
 */
function combineAll$$1(project) {
    return combineAll$1(project)(this);
}

Observable.prototype.combineAll = combineAll$$1;

/* tslint:enable:max-line-length */
/**
 * Combines multiple Observables to create an Observable whose values are
 * calculated from the latest values of each of its input Observables.
 *
 * <span class="informal">Whenever any input Observable emits a value, it
 * computes a formula using the latest values from all the inputs, then emits
 * the output of that formula.</span>
 *
 * <img src="./img/combineLatest.png" width="100%">
 *
 * `combineLatest` combines the values from this Observable with values from
 * Observables passed as arguments. This is done by subscribing to each
 * Observable, in order, and collecting an array of each of the most recent
 * values any time any of the input Observables emits, then either taking that
 * array and passing it as arguments to an optional `project` function and
 * emitting the return value of that, or just emitting the array of recent
 * values directly if there is no `project` function.
 *
 * @example <caption>Dynamically calculate the Body-Mass Index from an Observable of weight and one for height</caption>
 * var weight = Rx.Observable.of(70, 72, 76, 79, 75);
 * var height = Rx.Observable.of(1.76, 1.77, 1.78);
 * var bmi = weight.combineLatest(height, (w, h) => w / (h * h));
 * bmi.subscribe(x => console.log('BMI is ' + x));
 *
 * // With output to console:
 * // BMI is 24.212293388429753
 * // BMI is 23.93948099205209
 * // BMI is 23.671253629592222
 *
 * @see {@link combineAll}
 * @see {@link merge}
 * @see {@link withLatestFrom}
 *
 * @param {ObservableInput} other An input Observable to combine with the source
 * Observable. More than one input Observables may be given as argument.
 * @param {function} [project] An optional function to project the values from
 * the combined latest values into a new value on the output Observable.
 * @return {Observable} An Observable of projected values from the most recent
 * values from each input Observable, or an array of the most recent values from
 * each input Observable.
 * @method combineLatest
 * @owner Observable
 */
function combineLatest$2() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return combineLatest$1.apply(void 0, observables)(this);
}

Observable.prototype.combineLatest = combineLatest$2;

/* tslint:enable:max-line-length */
/**
 * Creates an output Observable which sequentially emits all values from every
 * given input Observable after the current Observable.
 *
 * <span class="informal">Concatenates multiple Observables together by
 * sequentially emitting their values, one Observable after the other.</span>
 *
 * <img src="./img/concat.png" width="100%">
 *
 * Joins this Observable with multiple other Observables by subscribing to them
 * one at a time, starting with the source, and merging their results into the
 * output Observable. Will wait for each Observable to complete before moving
 * on to the next.
 *
 * @example <caption>Concatenate a timer counting from 0 to 3 with a synchronous sequence from 1 to 10</caption>
 * var timer = Rx.Observable.interval(1000).take(4);
 * var sequence = Rx.Observable.range(1, 10);
 * var result = timer.concat(sequence);
 * result.subscribe(x => console.log(x));
 *
 * // results in:
 * // 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3 -immediate-> 1 ... 10
 *
 * @example <caption>Concatenate 3 Observables</caption>
 * var timer1 = Rx.Observable.interval(1000).take(10);
 * var timer2 = Rx.Observable.interval(2000).take(6);
 * var timer3 = Rx.Observable.interval(500).take(10);
 * var result = timer1.concat(timer2, timer3);
 * result.subscribe(x => console.log(x));
 *
 * // results in the following:
 * // (Prints to console sequentially)
 * // -1000ms-> 0 -1000ms-> 1 -1000ms-> ... 9
 * // -2000ms-> 0 -2000ms-> 1 -2000ms-> ... 5
 * // -500ms-> 0 -500ms-> 1 -500ms-> ... 9
 *
 * @see {@link concatAll}
 * @see {@link concatMap}
 * @see {@link concatMapTo}
 *
 * @param {ObservableInput} other An input Observable to concatenate after the source
 * Observable. More than one input Observables may be given as argument.
 * @param {Scheduler} [scheduler=null] An optional IScheduler to schedule each
 * Observable subscription on.
 * @return {Observable} All values of each passed Observable merged into a
 * single Observable, in order, in serial fashion.
 * @method concat
 * @owner Observable
 */
function concat$2() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return function (source) { return source.lift.call(concat.apply(void 0, [source].concat(observables))); };
}

/* tslint:enable:max-line-length */
/**
 * Creates an output Observable which sequentially emits all values from every
 * given input Observable after the current Observable.
 *
 * <span class="informal">Concatenates multiple Observables together by
 * sequentially emitting their values, one Observable after the other.</span>
 *
 * <img src="./img/concat.png" width="100%">
 *
 * Joins this Observable with multiple other Observables by subscribing to them
 * one at a time, starting with the source, and merging their results into the
 * output Observable. Will wait for each Observable to complete before moving
 * on to the next.
 *
 * @example <caption>Concatenate a timer counting from 0 to 3 with a synchronous sequence from 1 to 10</caption>
 * var timer = Rx.Observable.interval(1000).take(4);
 * var sequence = Rx.Observable.range(1, 10);
 * var result = timer.concat(sequence);
 * result.subscribe(x => console.log(x));
 *
 * // results in:
 * // 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3 -immediate-> 1 ... 10
 *
 * @example <caption>Concatenate 3 Observables</caption>
 * var timer1 = Rx.Observable.interval(1000).take(10);
 * var timer2 = Rx.Observable.interval(2000).take(6);
 * var timer3 = Rx.Observable.interval(500).take(10);
 * var result = timer1.concat(timer2, timer3);
 * result.subscribe(x => console.log(x));
 *
 * // results in the following:
 * // (Prints to console sequentially)
 * // -1000ms-> 0 -1000ms-> 1 -1000ms-> ... 9
 * // -2000ms-> 0 -2000ms-> 1 -2000ms-> ... 5
 * // -500ms-> 0 -500ms-> 1 -500ms-> ... 9
 *
 * @see {@link concatAll}
 * @see {@link concatMap}
 * @see {@link concatMapTo}
 *
 * @param {ObservableInput} other An input Observable to concatenate after the source
 * Observable. More than one input Observables may be given as argument.
 * @param {Scheduler} [scheduler=null] An optional IScheduler to schedule each
 * Observable subscription on.
 * @return {Observable} All values of each passed Observable merged into a
 * single Observable, in order, in serial fashion.
 * @method concat
 * @owner Observable
 */
function concat$1() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return concat$2.apply(void 0, observables)(this);
}

Observable.prototype.concat = concat$1;

/* tslint:enable:max-line-length */
/**
 * Converts a higher-order Observable into a first-order Observable by
 * concatenating the inner Observables in order.
 *
 * <span class="informal">Flattens an Observable-of-Observables by putting one
 * inner Observable after the other.</span>
 *
 * <img src="./img/concatAll.png" width="100%">
 *
 * Joins every Observable emitted by the source (a higher-order Observable), in
 * a serial fashion. It subscribes to each inner Observable only after the
 * previous inner Observable has completed, and merges all of their values into
 * the returned observable.
 *
 * __Warning:__ If the source Observable emits Observables quickly and
 * endlessly, and the inner Observables it emits generally complete slower than
 * the source emits, you can run into memory issues as the incoming Observables
 * collect in an unbounded buffer.
 *
 * Note: `concatAll` is equivalent to `mergeAll` with concurrency parameter set
 * to `1`.
 *
 * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map(ev => Rx.Observable.interval(1000).take(4));
 * var firstOrder = higherOrder.concatAll();
 * firstOrder.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // (results are not concurrent)
 * // For every click on the "document" it will emit values 0 to 3 spaced
 * // on a 1000ms interval
 * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
 *
 * @see {@link combineAll}
 * @see {@link concat}
 * @see {@link concatMap}
 * @see {@link concatMapTo}
 * @see {@link exhaust}
 * @see {@link mergeAll}
 * @see {@link switch}
 * @see {@link zipAll}
 *
 * @return {Observable} An Observable emitting values from all the inner
 * Observables concatenated.
 * @method concatAll
 * @owner Observable
 */
function concatAll$1() {
    return concatAll()(this);
}

Observable.prototype.concatAll = concatAll$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable, in a serialized fashion waiting for each one to complete before
 * merging the next.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link concatAll}.</span>
 *
 * <img src="./img/concatMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. Each new inner Observable is
 * concatenated with the previous inner Observable.
 *
 * __Warning:__ if source values arrive endlessly and faster than their
 * corresponding inner Observables can complete, it will result in memory issues
 * as inner Observables amass in an unbounded buffer waiting for their turn to
 * be subscribed to.
 *
 * Note: `concatMap` is equivalent to `mergeMap` with concurrency parameter set
 * to `1`.
 *
 * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.concatMap(ev => Rx.Observable.interval(1000).take(4));
 * result.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // (results are not concurrent)
 * // For every click on the "document" it will emit values 0 to 3 spaced
 * // on a 1000ms interval
 * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
 *
 * @see {@link concat}
 * @see {@link concatAll}
 * @see {@link concatMapTo}
 * @see {@link exhaustMap}
 * @see {@link mergeMap}
 * @see {@link switchMap}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and taking values from each projected inner
 * Observable sequentially.
 * @method concatMap
 * @owner Observable
 */
function concatMap$1(project, resultSelector) {
    return mergeMap(project, resultSelector, 1);
}

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable, in a serialized fashion waiting for each one to complete before
 * merging the next.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link concatAll}.</span>
 *
 * <img src="./img/concatMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. Each new inner Observable is
 * concatenated with the previous inner Observable.
 *
 * __Warning:__ if source values arrive endlessly and faster than their
 * corresponding inner Observables can complete, it will result in memory issues
 * as inner Observables amass in an unbounded buffer waiting for their turn to
 * be subscribed to.
 *
 * Note: `concatMap` is equivalent to `mergeMap` with concurrency parameter set
 * to `1`.
 *
 * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.concatMap(ev => Rx.Observable.interval(1000).take(4));
 * result.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // (results are not concurrent)
 * // For every click on the "document" it will emit values 0 to 3 spaced
 * // on a 1000ms interval
 * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
 *
 * @see {@link concat}
 * @see {@link concatAll}
 * @see {@link concatMapTo}
 * @see {@link exhaustMap}
 * @see {@link mergeMap}
 * @see {@link switchMap}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and taking values from each projected inner
 * Observable sequentially.
 * @method concatMap
 * @owner Observable
 */
function concatMap$$1(project, resultSelector) {
    return concatMap$1(project, resultSelector)(this);
}

Observable.prototype.concatMap = concatMap$$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to the same Observable which is merged multiple
 * times in a serialized fashion on the output Observable.
 *
 * <span class="informal">It's like {@link concatMap}, but maps each value
 * always to the same inner Observable.</span>
 *
 * <img src="./img/concatMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then flattens those resulting Observables into one
 * single Observable, which is the output Observable. Each new `innerObservable`
 * instance emitted on the output Observable is concatenated with the previous
 * `innerObservable` instance.
 *
 * __Warning:__ if source values arrive endlessly and faster than their
 * corresponding inner Observables can complete, it will result in memory issues
 * as inner Observables amass in an unbounded buffer waiting for their turn to
 * be subscribed to.
 *
 * Note: `concatMapTo` is equivalent to `mergeMapTo` with concurrency parameter
 * set to `1`.
 *
 * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.concatMapTo(Rx.Observable.interval(1000).take(4));
 * result.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // (results are not concurrent)
 * // For every click on the "document" it will emit values 0 to 3 spaced
 * // on a 1000ms interval
 * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
 *
 * @see {@link concat}
 * @see {@link concatAll}
 * @see {@link concatMap}
 * @see {@link mergeMapTo}
 * @see {@link switchMapTo}
 *
 * @param {ObservableInput} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An observable of values merged together by joining the
 * passed observable with itself, one after the other, for each value emitted
 * from the source.
 * @method concatMapTo
 * @owner Observable
 */
function concatMapTo$1(innerObservable, resultSelector) {
    return concatMap$1(function () { return innerObservable; }, resultSelector);
}

/* tslint:enable:max-line-length */
/**
 * Projects each source value to the same Observable which is merged multiple
 * times in a serialized fashion on the output Observable.
 *
 * <span class="informal">It's like {@link concatMap}, but maps each value
 * always to the same inner Observable.</span>
 *
 * <img src="./img/concatMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then flattens those resulting Observables into one
 * single Observable, which is the output Observable. Each new `innerObservable`
 * instance emitted on the output Observable is concatenated with the previous
 * `innerObservable` instance.
 *
 * __Warning:__ if source values arrive endlessly and faster than their
 * corresponding inner Observables can complete, it will result in memory issues
 * as inner Observables amass in an unbounded buffer waiting for their turn to
 * be subscribed to.
 *
 * Note: `concatMapTo` is equivalent to `mergeMapTo` with concurrency parameter
 * set to `1`.
 *
 * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.concatMapTo(Rx.Observable.interval(1000).take(4));
 * result.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // (results are not concurrent)
 * // For every click on the "document" it will emit values 0 to 3 spaced
 * // on a 1000ms interval
 * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
 *
 * @see {@link concat}
 * @see {@link concatAll}
 * @see {@link concatMap}
 * @see {@link mergeMapTo}
 * @see {@link switchMapTo}
 *
 * @param {ObservableInput} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An observable of values merged together by joining the
 * passed observable with itself, one after the other, for each value emitted
 * from the source.
 * @method concatMapTo
 * @owner Observable
 */
function concatMapTo$$1(innerObservable, resultSelector) {
    return concatMapTo$1(innerObservable, resultSelector)(this);
}

Observable.prototype.concatMapTo = concatMapTo$$1;

/**
 * Counts the number of emissions on the source and emits that number when the
 * source completes.
 *
 * <span class="informal">Tells how many values were emitted, when the source
 * completes.</span>
 *
 * <img src="./img/count.png" width="100%">
 *
 * `count` transforms an Observable that emits values into an Observable that
 * emits a single value that represents the number of values emitted by the
 * source Observable. If the source Observable terminates with an error, `count`
 * will pass this error notification along without emitting a value first. If
 * the source Observable does not terminate at all, `count` will neither emit
 * a value nor terminate. This operator takes an optional `predicate` function
 * as argument, in which case the output emission will represent the number of
 * source values that matched `true` with the `predicate`.
 *
 * @example <caption>Counts how many seconds have passed before the first click happened</caption>
 * var seconds = Rx.Observable.interval(1000);
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var secondsBeforeClick = seconds.takeUntil(clicks);
 * var result = secondsBeforeClick.count();
 * result.subscribe(x => console.log(x));
 *
 * @example <caption>Counts how many odd numbers are there between 1 and 7</caption>
 * var numbers = Rx.Observable.range(1, 7);
 * var result = numbers.count(i => i % 2 === 1);
 * result.subscribe(x => console.log(x));
 *
 * // Results in:
 * // 4
 *
 * @see {@link max}
 * @see {@link min}
 * @see {@link reduce}
 *
 * @param {function(value: T, i: number, source: Observable<T>): boolean} [predicate] A
 * boolean function to select what values are to be counted. It is provided with
 * arguments of:
 * - `value`: the value from the source Observable.
 * - `index`: the (zero-based) "index" of the value from the source Observable.
 * - `source`: the source Observable instance itself.
 * @return {Observable} An Observable of one number that represents the count as
 * described above.
 * @method count
 * @owner Observable
 */
function count$1(predicate) {
    return function (source) { return source.lift(new CountOperator(predicate, source)); };
}
var CountOperator = (function () {
    function CountOperator(predicate, source) {
        this.predicate = predicate;
        this.source = source;
    }
    CountOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new CountSubscriber(subscriber, this.predicate, this.source));
    };
    return CountOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var CountSubscriber = (function (_super) {
    __extends(CountSubscriber, _super);
    function CountSubscriber(destination, predicate, source) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.source = source;
        this.count = 0;
        this.index = 0;
    }
    CountSubscriber.prototype._next = function (value) {
        if (this.predicate) {
            this._tryPredicate(value);
        }
        else {
            this.count++;
        }
    };
    CountSubscriber.prototype._tryPredicate = function (value) {
        var result;
        try {
            result = this.predicate(value, this.index++, this.source);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        if (result) {
            this.count++;
        }
    };
    CountSubscriber.prototype._complete = function () {
        this.destination.next(this.count);
        this.destination.complete();
    };
    return CountSubscriber;
}(Subscriber));

/**
 * Counts the number of emissions on the source and emits that number when the
 * source completes.
 *
 * <span class="informal">Tells how many values were emitted, when the source
 * completes.</span>
 *
 * <img src="./img/count.png" width="100%">
 *
 * `count` transforms an Observable that emits values into an Observable that
 * emits a single value that represents the number of values emitted by the
 * source Observable. If the source Observable terminates with an error, `count`
 * will pass this error notification along without emitting a value first. If
 * the source Observable does not terminate at all, `count` will neither emit
 * a value nor terminate. This operator takes an optional `predicate` function
 * as argument, in which case the output emission will represent the number of
 * source values that matched `true` with the `predicate`.
 *
 * @example <caption>Counts how many seconds have passed before the first click happened</caption>
 * var seconds = Rx.Observable.interval(1000);
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var secondsBeforeClick = seconds.takeUntil(clicks);
 * var result = secondsBeforeClick.count();
 * result.subscribe(x => console.log(x));
 *
 * @example <caption>Counts how many odd numbers are there between 1 and 7</caption>
 * var numbers = Rx.Observable.range(1, 7);
 * var result = numbers.count(i => i % 2 === 1);
 * result.subscribe(x => console.log(x));
 *
 * // Results in:
 * // 4
 *
 * @see {@link max}
 * @see {@link min}
 * @see {@link reduce}
 *
 * @param {function(value: T, i: number, source: Observable<T>): boolean} [predicate] A
 * boolean function to select what values are to be counted. It is provided with
 * arguments of:
 * - `value`: the value from the source Observable.
 * - `index`: the (zero-based) "index" of the value from the source Observable.
 * - `source`: the source Observable instance itself.
 * @return {Observable} An Observable of one number that represents the count as
 * described above.
 * @method count
 * @owner Observable
 */
function count$$1(predicate) {
    return count$1(predicate)(this);
}

Observable.prototype.count = count$$1;

/**
 * Converts an Observable of {@link Notification} objects into the emissions
 * that they represent.
 *
 * <span class="informal">Unwraps {@link Notification} objects as actual `next`,
 * `error` and `complete` emissions. The opposite of {@link materialize}.</span>
 *
 * <img src="./img/dematerialize.png" width="100%">
 *
 * `dematerialize` is assumed to operate an Observable that only emits
 * {@link Notification} objects as `next` emissions, and does not emit any
 * `error`. Such Observable is the output of a `materialize` operation. Those
 * notifications are then unwrapped using the metadata they contain, and emitted
 * as `next`, `error`, and `complete` on the output Observable.
 *
 * Use this operator in conjunction with {@link materialize}.
 *
 * @example <caption>Convert an Observable of Notifications to an actual Observable</caption>
 * var notifA = new Rx.Notification('N', 'A');
 * var notifB = new Rx.Notification('N', 'B');
 * var notifE = new Rx.Notification('E', void 0,
 *   new TypeError('x.toUpperCase is not a function')
 * );
 * var materialized = Rx.Observable.of(notifA, notifB, notifE);
 * var upperCase = materialized.dematerialize();
 * upperCase.subscribe(x => console.log(x), e => console.error(e));
 *
 * // Results in:
 * // A
 * // B
 * // TypeError: x.toUpperCase is not a function
 *
 * @see {@link Notification}
 * @see {@link materialize}
 *
 * @return {Observable} An Observable that emits items and notifications
 * embedded in Notification objects emitted by the source Observable.
 * @method dematerialize
 * @owner Observable
 */
function dematerialize$1() {
    return function dematerializeOperatorFunction(source) {
        return source.lift(new DeMaterializeOperator());
    };
}
var DeMaterializeOperator = (function () {
    function DeMaterializeOperator() {
    }
    DeMaterializeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DeMaterializeSubscriber(subscriber));
    };
    return DeMaterializeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DeMaterializeSubscriber = (function (_super) {
    __extends(DeMaterializeSubscriber, _super);
    function DeMaterializeSubscriber(destination) {
        _super.call(this, destination);
    }
    DeMaterializeSubscriber.prototype._next = function (value) {
        value.observe(this.destination);
    };
    return DeMaterializeSubscriber;
}(Subscriber));

/**
 * Converts an Observable of {@link Notification} objects into the emissions
 * that they represent.
 *
 * <span class="informal">Unwraps {@link Notification} objects as actual `next`,
 * `error` and `complete` emissions. The opposite of {@link materialize}.</span>
 *
 * <img src="./img/dematerialize.png" width="100%">
 *
 * `dematerialize` is assumed to operate an Observable that only emits
 * {@link Notification} objects as `next` emissions, and does not emit any
 * `error`. Such Observable is the output of a `materialize` operation. Those
 * notifications are then unwrapped using the metadata they contain, and emitted
 * as `next`, `error`, and `complete` on the output Observable.
 *
 * Use this operator in conjunction with {@link materialize}.
 *
 * @example <caption>Convert an Observable of Notifications to an actual Observable</caption>
 * var notifA = new Rx.Notification('N', 'A');
 * var notifB = new Rx.Notification('N', 'B');
 * var notifE = new Rx.Notification('E', void 0,
 *   new TypeError('x.toUpperCase is not a function')
 * );
 * var materialized = Rx.Observable.of(notifA, notifB, notifE);
 * var upperCase = materialized.dematerialize();
 * upperCase.subscribe(x => console.log(x), e => console.error(e));
 *
 * // Results in:
 * // A
 * // B
 * // TypeError: x.toUpperCase is not a function
 *
 * @see {@link Notification}
 * @see {@link materialize}
 *
 * @return {Observable} An Observable that emits items and notifications
 * embedded in Notification objects emitted by the source Observable.
 * @method dematerialize
 * @owner Observable
 */
function dematerialize$$1() {
    return dematerialize$1()(this);
}

Observable.prototype.dematerialize = dematerialize$$1;

/**
 * Emits a value from the source Observable only after a particular time span
 * determined by another Observable has passed without another source emission.
 *
 * <span class="informal">It's like {@link debounceTime}, but the time span of
 * emission silence is determined by a second Observable.</span>
 *
 * <img src="./img/debounce.png" width="100%">
 *
 * `debounce` delays values emitted by the source Observable, but drops previous
 * pending delayed emissions if a new value arrives on the source Observable.
 * This operator keeps track of the most recent value from the source
 * Observable, and spawns a duration Observable by calling the
 * `durationSelector` function. The value is emitted only when the duration
 * Observable emits a value or completes, and if no other value was emitted on
 * the source Observable since the duration Observable was spawned. If a new
 * value appears before the duration Observable emits, the previous value will
 * be dropped and will not be emitted on the output Observable.
 *
 * Like {@link debounceTime}, this is a rate-limiting operator, and also a
 * delay-like operator since output emissions do not necessarily occur at the
 * same time as they did on the source Observable.
 *
 * @example <caption>Emit the most recent click after a burst of clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.debounce(() => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounceTime}
 * @see {@link delayWhen}
 * @see {@link throttle}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the timeout
 * duration for each source value, returned as an Observable or a Promise.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified duration Observable returned by
 * `durationSelector`, and may drop some values if they occur too frequently.
 * @method debounce
 * @owner Observable
 */
function debounce$1(durationSelector) {
    return function (source) { return source.lift(new DebounceOperator(durationSelector)); };
}
var DebounceOperator = (function () {
    function DebounceOperator(durationSelector) {
        this.durationSelector = durationSelector;
    }
    DebounceOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DebounceSubscriber(subscriber, this.durationSelector));
    };
    return DebounceOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DebounceSubscriber = (function (_super) {
    __extends(DebounceSubscriber, _super);
    function DebounceSubscriber(destination, durationSelector) {
        _super.call(this, destination);
        this.durationSelector = durationSelector;
        this.hasValue = false;
        this.durationSubscription = null;
    }
    DebounceSubscriber.prototype._next = function (value) {
        try {
            var result = this.durationSelector.call(this, value);
            if (result) {
                this._tryNext(value, result);
            }
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    DebounceSubscriber.prototype._complete = function () {
        this.emitValue();
        this.destination.complete();
    };
    DebounceSubscriber.prototype._tryNext = function (value, duration) {
        var subscription = this.durationSubscription;
        this.value = value;
        this.hasValue = true;
        if (subscription) {
            subscription.unsubscribe();
            this.remove(subscription);
        }
        subscription = subscribeToResult(this, duration);
        if (!subscription.closed) {
            this.add(this.durationSubscription = subscription);
        }
    };
    DebounceSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.emitValue();
    };
    DebounceSubscriber.prototype.notifyComplete = function () {
        this.emitValue();
    };
    DebounceSubscriber.prototype.emitValue = function () {
        if (this.hasValue) {
            var value = this.value;
            var subscription = this.durationSubscription;
            if (subscription) {
                this.durationSubscription = null;
                subscription.unsubscribe();
                this.remove(subscription);
            }
            this.value = null;
            this.hasValue = false;
            _super.prototype._next.call(this, value);
        }
    };
    return DebounceSubscriber;
}(OuterSubscriber));

/**
 * Emits a value from the source Observable only after a particular time span
 * determined by another Observable has passed without another source emission.
 *
 * <span class="informal">It's like {@link debounceTime}, but the time span of
 * emission silence is determined by a second Observable.</span>
 *
 * <img src="./img/debounce.png" width="100%">
 *
 * `debounce` delays values emitted by the source Observable, but drops previous
 * pending delayed emissions if a new value arrives on the source Observable.
 * This operator keeps track of the most recent value from the source
 * Observable, and spawns a duration Observable by calling the
 * `durationSelector` function. The value is emitted only when the duration
 * Observable emits a value or completes, and if no other value was emitted on
 * the source Observable since the duration Observable was spawned. If a new
 * value appears before the duration Observable emits, the previous value will
 * be dropped and will not be emitted on the output Observable.
 *
 * Like {@link debounceTime}, this is a rate-limiting operator, and also a
 * delay-like operator since output emissions do not necessarily occur at the
 * same time as they did on the source Observable.
 *
 * @example <caption>Emit the most recent click after a burst of clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.debounce(() => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounceTime}
 * @see {@link delayWhen}
 * @see {@link throttle}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the timeout
 * duration for each source value, returned as an Observable or a Promise.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified duration Observable returned by
 * `durationSelector`, and may drop some values if they occur too frequently.
 * @method debounce
 * @owner Observable
 */
function debounce$$1(durationSelector) {
    return debounce$1(durationSelector)(this);
}

Observable.prototype.debounce = debounce$$1;

/**
 * Emits a value from the source Observable only after a particular time span
 * has passed without another source emission.
 *
 * <span class="informal">It's like {@link delay}, but passes only the most
 * recent value from each burst of emissions.</span>
 *
 * <img src="./img/debounceTime.png" width="100%">
 *
 * `debounceTime` delays values emitted by the source Observable, but drops
 * previous pending delayed emissions if a new value arrives on the source
 * Observable. This operator keeps track of the most recent value from the
 * source Observable, and emits that only when `dueTime` enough time has passed
 * without any other value appearing on the source Observable. If a new value
 * appears before `dueTime` silence occurs, the previous value will be dropped
 * and will not be emitted on the output Observable.
 *
 * This is a rate-limiting operator, because it is impossible for more than one
 * value to be emitted in any time window of duration `dueTime`, but it is also
 * a delay-like operator since output emissions do not occur at the same time as
 * they did on the source Observable. Optionally takes a {@link IScheduler} for
 * managing timers.
 *
 * @example <caption>Emit the most recent click after a burst of clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.debounceTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounce}
 * @see {@link delay}
 * @see {@link sampleTime}
 * @see {@link throttleTime}
 *
 * @param {number} dueTime The timeout duration in milliseconds (or the time
 * unit determined internally by the optional `scheduler`) for the window of
 * time required to wait for emission silence before emitting the most recent
 * source value.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the timeout for each value.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified `dueTime`, and may drop some values if they occur
 * too frequently.
 * @method debounceTime
 * @owner Observable
 */
function debounceTime$1(dueTime, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return function (source) { return source.lift(new DebounceTimeOperator(dueTime, scheduler)); };
}
var DebounceTimeOperator = (function () {
    function DebounceTimeOperator(dueTime, scheduler) {
        this.dueTime = dueTime;
        this.scheduler = scheduler;
    }
    DebounceTimeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DebounceTimeSubscriber(subscriber, this.dueTime, this.scheduler));
    };
    return DebounceTimeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DebounceTimeSubscriber = (function (_super) {
    __extends(DebounceTimeSubscriber, _super);
    function DebounceTimeSubscriber(destination, dueTime, scheduler) {
        _super.call(this, destination);
        this.dueTime = dueTime;
        this.scheduler = scheduler;
        this.debouncedSubscription = null;
        this.lastValue = null;
        this.hasValue = false;
    }
    DebounceTimeSubscriber.prototype._next = function (value) {
        this.clearDebounce();
        this.lastValue = value;
        this.hasValue = true;
        this.add(this.debouncedSubscription = this.scheduler.schedule(dispatchNext$3, this.dueTime, this));
    };
    DebounceTimeSubscriber.prototype._complete = function () {
        this.debouncedNext();
        this.destination.complete();
    };
    DebounceTimeSubscriber.prototype.debouncedNext = function () {
        this.clearDebounce();
        if (this.hasValue) {
            this.destination.next(this.lastValue);
            this.lastValue = null;
            this.hasValue = false;
        }
    };
    DebounceTimeSubscriber.prototype.clearDebounce = function () {
        var debouncedSubscription = this.debouncedSubscription;
        if (debouncedSubscription !== null) {
            this.remove(debouncedSubscription);
            debouncedSubscription.unsubscribe();
            this.debouncedSubscription = null;
        }
    };
    return DebounceTimeSubscriber;
}(Subscriber));
function dispatchNext$3(subscriber) {
    subscriber.debouncedNext();
}

/**
 * Emits a value from the source Observable only after a particular time span
 * has passed without another source emission.
 *
 * <span class="informal">It's like {@link delay}, but passes only the most
 * recent value from each burst of emissions.</span>
 *
 * <img src="./img/debounceTime.png" width="100%">
 *
 * `debounceTime` delays values emitted by the source Observable, but drops
 * previous pending delayed emissions if a new value arrives on the source
 * Observable. This operator keeps track of the most recent value from the
 * source Observable, and emits that only when `dueTime` enough time has passed
 * without any other value appearing on the source Observable. If a new value
 * appears before `dueTime` silence occurs, the previous value will be dropped
 * and will not be emitted on the output Observable.
 *
 * This is a rate-limiting operator, because it is impossible for more than one
 * value to be emitted in any time window of duration `dueTime`, but it is also
 * a delay-like operator since output emissions do not occur at the same time as
 * they did on the source Observable. Optionally takes a {@link IScheduler} for
 * managing timers.
 *
 * @example <caption>Emit the most recent click after a burst of clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.debounceTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounce}
 * @see {@link delay}
 * @see {@link sampleTime}
 * @see {@link throttleTime}
 *
 * @param {number} dueTime The timeout duration in milliseconds (or the time
 * unit determined internally by the optional `scheduler`) for the window of
 * time required to wait for emission silence before emitting the most recent
 * source value.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the timeout for each value.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified `dueTime`, and may drop some values if they occur
 * too frequently.
 * @method debounceTime
 * @owner Observable
 */
function debounceTime$$1(dueTime, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return debounceTime$1(dueTime, scheduler)(this);
}

Observable.prototype.debounceTime = debounceTime$$1;

/* tslint:enable:max-line-length */
/**
 * Emits a given value if the source Observable completes without emitting any
 * `next` value, otherwise mirrors the source Observable.
 *
 * <span class="informal">If the source Observable turns out to be empty, then
 * this operator will emit a default value.</span>
 *
 * <img src="./img/defaultIfEmpty.png" width="100%">
 *
 * `defaultIfEmpty` emits the values emitted by the source Observable or a
 * specified default value if the source Observable is empty (completes without
 * having emitted any `next` value).
 *
 * @example <caption>If no clicks happen in 5 seconds, then emit "no clicks"</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var clicksBeforeFive = clicks.takeUntil(Rx.Observable.interval(5000));
 * var result = clicksBeforeFive.defaultIfEmpty('no clicks');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link empty}
 * @see {@link last}
 *
 * @param {any} [defaultValue=null] The default value used if the source
 * Observable is empty.
 * @return {Observable} An Observable that emits either the specified
 * `defaultValue` if the source Observable emits no items, or the values emitted
 * by the source Observable.
 * @method defaultIfEmpty
 * @owner Observable
 */
function defaultIfEmpty$1(defaultValue) {
    if (defaultValue === void 0) { defaultValue = null; }
    return function (source) { return source.lift(new DefaultIfEmptyOperator(defaultValue)); };
}
var DefaultIfEmptyOperator = (function () {
    function DefaultIfEmptyOperator(defaultValue) {
        this.defaultValue = defaultValue;
    }
    DefaultIfEmptyOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
    };
    return DefaultIfEmptyOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DefaultIfEmptySubscriber = (function (_super) {
    __extends(DefaultIfEmptySubscriber, _super);
    function DefaultIfEmptySubscriber(destination, defaultValue) {
        _super.call(this, destination);
        this.defaultValue = defaultValue;
        this.isEmpty = true;
    }
    DefaultIfEmptySubscriber.prototype._next = function (value) {
        this.isEmpty = false;
        this.destination.next(value);
    };
    DefaultIfEmptySubscriber.prototype._complete = function () {
        if (this.isEmpty) {
            this.destination.next(this.defaultValue);
        }
        this.destination.complete();
    };
    return DefaultIfEmptySubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Emits a given value if the source Observable completes without emitting any
 * `next` value, otherwise mirrors the source Observable.
 *
 * <span class="informal">If the source Observable turns out to be empty, then
 * this operator will emit a default value.</span>
 *
 * <img src="./img/defaultIfEmpty.png" width="100%">
 *
 * `defaultIfEmpty` emits the values emitted by the source Observable or a
 * specified default value if the source Observable is empty (completes without
 * having emitted any `next` value).
 *
 * @example <caption>If no clicks happen in 5 seconds, then emit "no clicks"</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var clicksBeforeFive = clicks.takeUntil(Rx.Observable.interval(5000));
 * var result = clicksBeforeFive.defaultIfEmpty('no clicks');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link empty}
 * @see {@link last}
 *
 * @param {any} [defaultValue=null] The default value used if the source
 * Observable is empty.
 * @return {Observable} An Observable that emits either the specified
 * `defaultValue` if the source Observable emits no items, or the values emitted
 * by the source Observable.
 * @method defaultIfEmpty
 * @owner Observable
 */
function defaultIfEmpty$$1(defaultValue) {
    if (defaultValue === void 0) { defaultValue = null; }
    return defaultIfEmpty$1(defaultValue)(this);
}

Observable.prototype.defaultIfEmpty = defaultIfEmpty$$1;

/**
 * Delays the emission of items from the source Observable by a given timeout or
 * until a given Date.
 *
 * <span class="informal">Time shifts each item by some specified amount of
 * milliseconds.</span>
 *
 * <img src="./img/delay.png" width="100%">
 *
 * If the delay argument is a Number, this operator time shifts the source
 * Observable by that amount of time expressed in milliseconds. The relative
 * time intervals between the values are preserved.
 *
 * If the delay argument is a Date, this operator time shifts the start of the
 * Observable execution until the given date occurs.
 *
 * @example <caption>Delay each click by one second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var delayedClicks = clicks.delay(1000); // each click emitted after 1 second
 * delayedClicks.subscribe(x => console.log(x));
 *
 * @example <caption>Delay all clicks until a future date happens</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var date = new Date('March 15, 2050 12:00:00'); // in the future
 * var delayedClicks = clicks.delay(date); // click emitted only after that date
 * delayedClicks.subscribe(x => console.log(x));
 *
 * @see {@link debounceTime}
 * @see {@link delayWhen}
 *
 * @param {number|Date} delay The delay duration in milliseconds (a `number`) or
 * a `Date` until which the emission of the source items is delayed.
 * @param {Scheduler} [scheduler=async] The IScheduler to use for
 * managing the timers that handle the time-shift for each item.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified timeout or Date.
 * @method delay
 * @owner Observable
 */
function delay$1(delay, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    var absoluteDelay = isDate(delay);
    var delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);
    return function (source) { return source.lift(new DelayOperator(delayFor, scheduler)); };
}
var DelayOperator = (function () {
    function DelayOperator(delay, scheduler) {
        this.delay = delay;
        this.scheduler = scheduler;
    }
    DelayOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));
    };
    return DelayOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DelaySubscriber = (function (_super) {
    __extends(DelaySubscriber, _super);
    function DelaySubscriber(destination, delay, scheduler) {
        _super.call(this, destination);
        this.delay = delay;
        this.scheduler = scheduler;
        this.queue = [];
        this.active = false;
        this.errored = false;
    }
    DelaySubscriber.dispatch = function (state) {
        var source = state.source;
        var queue = source.queue;
        var scheduler = state.scheduler;
        var destination = state.destination;
        while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {
            queue.shift().notification.observe(destination);
        }
        if (queue.length > 0) {
            var delay_1 = Math.max(0, queue[0].time - scheduler.now());
            this.schedule(state, delay_1);
        }
        else {
            this.unsubscribe();
            source.active = false;
        }
    };
    DelaySubscriber.prototype._schedule = function (scheduler) {
        this.active = true;
        this.add(scheduler.schedule(DelaySubscriber.dispatch, this.delay, {
            source: this, destination: this.destination, scheduler: scheduler
        }));
    };
    DelaySubscriber.prototype.scheduleNotification = function (notification) {
        if (this.errored === true) {
            return;
        }
        var scheduler = this.scheduler;
        var message = new DelayMessage(scheduler.now() + this.delay, notification);
        this.queue.push(message);
        if (this.active === false) {
            this._schedule(scheduler);
        }
    };
    DelaySubscriber.prototype._next = function (value) {
        this.scheduleNotification(Notification.createNext(value));
    };
    DelaySubscriber.prototype._error = function (err) {
        this.errored = true;
        this.queue = [];
        this.destination.error(err);
    };
    DelaySubscriber.prototype._complete = function () {
        this.scheduleNotification(Notification.createComplete());
    };
    return DelaySubscriber;
}(Subscriber));
var DelayMessage = (function () {
    function DelayMessage(time, notification) {
        this.time = time;
        this.notification = notification;
    }
    return DelayMessage;
}());

/**
 * Delays the emission of items from the source Observable by a given timeout or
 * until a given Date.
 *
 * <span class="informal">Time shifts each item by some specified amount of
 * milliseconds.</span>
 *
 * <img src="./img/delay.png" width="100%">
 *
 * If the delay argument is a Number, this operator time shifts the source
 * Observable by that amount of time expressed in milliseconds. The relative
 * time intervals between the values are preserved.
 *
 * If the delay argument is a Date, this operator time shifts the start of the
 * Observable execution until the given date occurs.
 *
 * @example <caption>Delay each click by one second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var delayedClicks = clicks.delay(1000); // each click emitted after 1 second
 * delayedClicks.subscribe(x => console.log(x));
 *
 * @example <caption>Delay all clicks until a future date happens</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var date = new Date('March 15, 2050 12:00:00'); // in the future
 * var delayedClicks = clicks.delay(date); // click emitted only after that date
 * delayedClicks.subscribe(x => console.log(x));
 *
 * @see {@link debounceTime}
 * @see {@link delayWhen}
 *
 * @param {number|Date} delay The delay duration in milliseconds (a `number`) or
 * a `Date` until which the emission of the source items is delayed.
 * @param {Scheduler} [scheduler=async] The IScheduler to use for
 * managing the timers that handle the time-shift for each item.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified timeout or Date.
 * @method delay
 * @owner Observable
 */
function delay$$1(delay$$1, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return delay$1(delay$$1, scheduler)(this);
}

Observable.prototype.delay = delay$$1;

/**
 * Delays the emission of items from the source Observable by a given time span
 * determined by the emissions of another Observable.
 *
 * <span class="informal">It's like {@link delay}, but the time span of the
 * delay duration is determined by a second Observable.</span>
 *
 * <img src="./img/delayWhen.png" width="100%">
 *
 * `delayWhen` time shifts each emitted value from the source Observable by a
 * time span determined by another Observable. When the source emits a value,
 * the `delayDurationSelector` function is called with the source value as
 * argument, and should return an Observable, called the "duration" Observable.
 * The source value is emitted on the output Observable only when the duration
 * Observable emits a value or completes.
 *
 * Optionally, `delayWhen` takes a second argument, `subscriptionDelay`, which
 * is an Observable. When `subscriptionDelay` emits its first value or
 * completes, the source Observable is subscribed to and starts behaving like
 * described in the previous paragraph. If `subscriptionDelay` is not provided,
 * `delayWhen` will subscribe to the source Observable as soon as the output
 * Observable is subscribed.
 *
 * @example <caption>Delay each click by a random amount of time, between 0 and 5 seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var delayedClicks = clicks.delayWhen(event =>
 *   Rx.Observable.interval(Math.random() * 5000)
 * );
 * delayedClicks.subscribe(x => console.log(x));
 *
 * @see {@link debounce}
 * @see {@link delay}
 *
 * @param {function(value: T): Observable} delayDurationSelector A function that
 * returns an Observable for each value emitted by the source Observable, which
 * is then used to delay the emission of that item on the output Observable
 * until the Observable returned from this function emits a value.
 * @param {Observable} subscriptionDelay An Observable that triggers the
 * subscription to the source Observable once it emits any value.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by an amount of time specified by the Observable returned by
 * `delayDurationSelector`.
 * @method delayWhen
 * @owner Observable
 */
function delayWhen$1(delayDurationSelector, subscriptionDelay) {
    if (subscriptionDelay) {
        return function (source) {
            return new SubscriptionDelayObservable(source, subscriptionDelay)
                .lift(new DelayWhenOperator(delayDurationSelector));
        };
    }
    return function (source) { return source.lift(new DelayWhenOperator(delayDurationSelector)); };
}
var DelayWhenOperator = (function () {
    function DelayWhenOperator(delayDurationSelector) {
        this.delayDurationSelector = delayDurationSelector;
    }
    DelayWhenOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DelayWhenSubscriber(subscriber, this.delayDurationSelector));
    };
    return DelayWhenOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DelayWhenSubscriber = (function (_super) {
    __extends(DelayWhenSubscriber, _super);
    function DelayWhenSubscriber(destination, delayDurationSelector) {
        _super.call(this, destination);
        this.delayDurationSelector = delayDurationSelector;
        this.completed = false;
        this.delayNotifierSubscriptions = [];
        this.values = [];
    }
    DelayWhenSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.destination.next(outerValue);
        this.removeSubscription(innerSub);
        this.tryComplete();
    };
    DelayWhenSubscriber.prototype.notifyError = function (error, innerSub) {
        this._error(error);
    };
    DelayWhenSubscriber.prototype.notifyComplete = function (innerSub) {
        var value = this.removeSubscription(innerSub);
        if (value) {
            this.destination.next(value);
        }
        this.tryComplete();
    };
    DelayWhenSubscriber.prototype._next = function (value) {
        try {
            var delayNotifier = this.delayDurationSelector(value);
            if (delayNotifier) {
                this.tryDelay(delayNotifier, value);
            }
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    DelayWhenSubscriber.prototype._complete = function () {
        this.completed = true;
        this.tryComplete();
    };
    DelayWhenSubscriber.prototype.removeSubscription = function (subscription) {
        subscription.unsubscribe();
        var subscriptionIdx = this.delayNotifierSubscriptions.indexOf(subscription);
        var value = null;
        if (subscriptionIdx !== -1) {
            value = this.values[subscriptionIdx];
            this.delayNotifierSubscriptions.splice(subscriptionIdx, 1);
            this.values.splice(subscriptionIdx, 1);
        }
        return value;
    };
    DelayWhenSubscriber.prototype.tryDelay = function (delayNotifier, value) {
        var notifierSubscription = subscribeToResult(this, delayNotifier, value);
        if (notifierSubscription && !notifierSubscription.closed) {
            this.add(notifierSubscription);
            this.delayNotifierSubscriptions.push(notifierSubscription);
        }
        this.values.push(value);
    };
    DelayWhenSubscriber.prototype.tryComplete = function () {
        if (this.completed && this.delayNotifierSubscriptions.length === 0) {
            this.destination.complete();
        }
    };
    return DelayWhenSubscriber;
}(OuterSubscriber));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SubscriptionDelayObservable = (function (_super) {
    __extends(SubscriptionDelayObservable, _super);
    function SubscriptionDelayObservable(/** @deprecated internal use only */ source, subscriptionDelay) {
        _super.call(this);
        this.source = source;
        this.subscriptionDelay = subscriptionDelay;
    }
    /** @deprecated internal use only */ SubscriptionDelayObservable.prototype._subscribe = function (subscriber) {
        this.subscriptionDelay.subscribe(new SubscriptionDelaySubscriber(subscriber, this.source));
    };
    return SubscriptionDelayObservable;
}(Observable));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SubscriptionDelaySubscriber = (function (_super) {
    __extends(SubscriptionDelaySubscriber, _super);
    function SubscriptionDelaySubscriber(parent, source) {
        _super.call(this);
        this.parent = parent;
        this.source = source;
        this.sourceSubscribed = false;
    }
    SubscriptionDelaySubscriber.prototype._next = function (unused) {
        this.subscribeToSource();
    };
    SubscriptionDelaySubscriber.prototype._error = function (err) {
        this.unsubscribe();
        this.parent.error(err);
    };
    SubscriptionDelaySubscriber.prototype._complete = function () {
        this.subscribeToSource();
    };
    SubscriptionDelaySubscriber.prototype.subscribeToSource = function () {
        if (!this.sourceSubscribed) {
            this.sourceSubscribed = true;
            this.unsubscribe();
            this.source.subscribe(this.parent);
        }
    };
    return SubscriptionDelaySubscriber;
}(Subscriber));

/**
 * Delays the emission of items from the source Observable by a given time span
 * determined by the emissions of another Observable.
 *
 * <span class="informal">It's like {@link delay}, but the time span of the
 * delay duration is determined by a second Observable.</span>
 *
 * <img src="./img/delayWhen.png" width="100%">
 *
 * `delayWhen` time shifts each emitted value from the source Observable by a
 * time span determined by another Observable. When the source emits a value,
 * the `delayDurationSelector` function is called with the source value as
 * argument, and should return an Observable, called the "duration" Observable.
 * The source value is emitted on the output Observable only when the duration
 * Observable emits a value or completes.
 *
 * Optionally, `delayWhen` takes a second argument, `subscriptionDelay`, which
 * is an Observable. When `subscriptionDelay` emits its first value or
 * completes, the source Observable is subscribed to and starts behaving like
 * described in the previous paragraph. If `subscriptionDelay` is not provided,
 * `delayWhen` will subscribe to the source Observable as soon as the output
 * Observable is subscribed.
 *
 * @example <caption>Delay each click by a random amount of time, between 0 and 5 seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var delayedClicks = clicks.delayWhen(event =>
 *   Rx.Observable.interval(Math.random() * 5000)
 * );
 * delayedClicks.subscribe(x => console.log(x));
 *
 * @see {@link debounce}
 * @see {@link delay}
 *
 * @param {function(value: T): Observable} delayDurationSelector A function that
 * returns an Observable for each value emitted by the source Observable, which
 * is then used to delay the emission of that item on the output Observable
 * until the Observable returned from this function emits a value.
 * @param {Observable} subscriptionDelay An Observable that triggers the
 * subscription to the source Observable once it emits any value.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by an amount of time specified by the Observable returned by
 * `delayDurationSelector`.
 * @method delayWhen
 * @owner Observable
 */
function delayWhen$$1(delayDurationSelector, subscriptionDelay) {
    return delayWhen$1(delayDurationSelector, subscriptionDelay)(this);
}

Observable.prototype.delayWhen = delayWhen$$1;

function minimalSetImpl() {
    // THIS IS NOT a full impl of Set, this is just the minimum
    // bits of functionality we need for this library.
    return (function () {
        function MinimalSet() {
            this._values = [];
        }
        MinimalSet.prototype.add = function (value) {
            if (!this.has(value)) {
                this._values.push(value);
            }
        };
        MinimalSet.prototype.has = function (value) {
            return this._values.indexOf(value) !== -1;
        };
        Object.defineProperty(MinimalSet.prototype, "size", {
            get: function () {
                return this._values.length;
            },
            enumerable: true,
            configurable: true
        });
        MinimalSet.prototype.clear = function () {
            this._values.length = 0;
        };
        return MinimalSet;
    }());
}
var Set = _root.Set || minimalSetImpl();

/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from previous items.
 *
 * If a keySelector function is provided, then it will project each value from the source observable into a new value that it will
 * check for equality with previously projected values. If a keySelector function is not provided, it will use each value from the
 * source observable directly with an equality check against previous values.
 *
 * In JavaScript runtimes that support `Set`, this operator will use a `Set` to improve performance of the distinct value checking.
 *
 * In other runtimes, this operator will use a minimal implementation of `Set` that relies on an `Array` and `indexOf` under the
 * hood, so performance will degrade as more values are checked for distinction. Even in newer browsers, a long-running `distinct`
 * use might result in memory leaks. To help alleviate this in some scenarios, an optional `flushes` parameter is also provided so
 * that the internal `Set` can be "flushed", basically clearing it of values.
 *
 * @example <caption>A simple example with numbers</caption>
 * Observable.of(1, 1, 2, 2, 2, 1, 2, 3, 4, 3, 2, 1)
 *   .distinct()
 *   .subscribe(x => console.log(x)); // 1, 2, 3, 4
 *
 * @example <caption>An example using a keySelector function</caption>
 * interface Person {
 *    age: number,
 *    name: string
 * }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'})
 *     .distinct((p: Person) => p.name)
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 *
 * @see {@link distinctUntilChanged}
 * @see {@link distinctUntilKeyChanged}
 *
 * @param {function} [keySelector] Optional function to select which value you want to check as distinct.
 * @param {Observable} [flushes] Optional Observable for flushing the internal HashSet of the operator.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values.
 * @method distinct
 * @owner Observable
 */
function distinct$1(keySelector, flushes) {
    return function (source) { return source.lift(new DistinctOperator(keySelector, flushes)); };
}
var DistinctOperator = (function () {
    function DistinctOperator(keySelector, flushes) {
        this.keySelector = keySelector;
        this.flushes = flushes;
    }
    DistinctOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DistinctSubscriber(subscriber, this.keySelector, this.flushes));
    };
    return DistinctOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DistinctSubscriber = (function (_super) {
    __extends(DistinctSubscriber, _super);
    function DistinctSubscriber(destination, keySelector, flushes) {
        _super.call(this, destination);
        this.keySelector = keySelector;
        this.values = new Set();
        if (flushes) {
            this.add(subscribeToResult(this, flushes));
        }
    }
    DistinctSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.values.clear();
    };
    DistinctSubscriber.prototype.notifyError = function (error, innerSub) {
        this._error(error);
    };
    DistinctSubscriber.prototype._next = function (value) {
        if (this.keySelector) {
            this._useKeySelector(value);
        }
        else {
            this._finalizeNext(value, value);
        }
    };
    DistinctSubscriber.prototype._useKeySelector = function (value) {
        var key;
        var destination = this.destination;
        try {
            key = this.keySelector(value);
        }
        catch (err) {
            destination.error(err);
            return;
        }
        this._finalizeNext(key, value);
    };
    DistinctSubscriber.prototype._finalizeNext = function (key, value) {
        var values = this.values;
        if (!values.has(key)) {
            values.add(key);
            this.destination.next(value);
        }
    };
    return DistinctSubscriber;
}(OuterSubscriber));

/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from previous items.
 *
 * If a keySelector function is provided, then it will project each value from the source observable into a new value that it will
 * check for equality with previously projected values. If a keySelector function is not provided, it will use each value from the
 * source observable directly with an equality check against previous values.
 *
 * In JavaScript runtimes that support `Set`, this operator will use a `Set` to improve performance of the distinct value checking.
 *
 * In other runtimes, this operator will use a minimal implementation of `Set` that relies on an `Array` and `indexOf` under the
 * hood, so performance will degrade as more values are checked for distinction. Even in newer browsers, a long-running `distinct`
 * use might result in memory leaks. To help alleviate this in some scenarios, an optional `flushes` parameter is also provided so
 * that the internal `Set` can be "flushed", basically clearing it of values.
 *
 * @example <caption>A simple example with numbers</caption>
 * Observable.of(1, 1, 2, 2, 2, 1, 2, 3, 4, 3, 2, 1)
 *   .distinct()
 *   .subscribe(x => console.log(x)); // 1, 2, 3, 4
 *
 * @example <caption>An example using a keySelector function</caption>
 * interface Person {
 *    age: number,
 *    name: string
 * }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'})
 *     .distinct((p: Person) => p.name)
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 *
 * @see {@link distinctUntilChanged}
 * @see {@link distinctUntilKeyChanged}
 *
 * @param {function} [keySelector] Optional function to select which value you want to check as distinct.
 * @param {Observable} [flushes] Optional Observable for flushing the internal HashSet of the operator.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values.
 * @method distinct
 * @owner Observable
 */
function distinct$$1(keySelector, flushes) {
    return distinct$1(keySelector, flushes)(this);
}

Observable.prototype.distinct = distinct$$1;

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item.
 *
 * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
 *
 * If a comparator function is not provided, an equality check is used by default.
 *
 * @example <caption>A simple example with numbers</caption>
 * Observable.of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4)
 *   .distinctUntilChanged()
 *   .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4
 *
 * @example <caption>An example using a compare function</caption>
 * interface Person {
 *    age: number,
 *    name: string
 * }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'})
 *     { age: 6, name: 'Foo'})
 *     .distinctUntilChanged((p: Person, q: Person) => p.name === q.name)
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo' }
 *
 * @see {@link distinct}
 * @see {@link distinctUntilKeyChanged}
 *
 * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values.
 * @method distinctUntilChanged
 * @owner Observable
 */
function distinctUntilChanged$1(compare, keySelector) {
    return function (source) { return source.lift(new DistinctUntilChangedOperator(compare, keySelector)); };
}
var DistinctUntilChangedOperator = (function () {
    function DistinctUntilChangedOperator(compare, keySelector) {
        this.compare = compare;
        this.keySelector = keySelector;
    }
    DistinctUntilChangedOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));
    };
    return DistinctUntilChangedOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DistinctUntilChangedSubscriber = (function (_super) {
    __extends(DistinctUntilChangedSubscriber, _super);
    function DistinctUntilChangedSubscriber(destination, compare, keySelector) {
        _super.call(this, destination);
        this.keySelector = keySelector;
        this.hasKey = false;
        if (typeof compare === 'function') {
            this.compare = compare;
        }
    }
    DistinctUntilChangedSubscriber.prototype.compare = function (x, y) {
        return x === y;
    };
    DistinctUntilChangedSubscriber.prototype._next = function (value) {
        var keySelector = this.keySelector;
        var key = value;
        if (keySelector) {
            key = tryCatch(this.keySelector)(value);
            if (key === errorObject) {
                return this.destination.error(errorObject.e);
            }
        }
        var result = false;
        if (this.hasKey) {
            result = tryCatch(this.compare)(this.key, key);
            if (result === errorObject) {
                return this.destination.error(errorObject.e);
            }
        }
        else {
            this.hasKey = true;
        }
        if (Boolean(result) === false) {
            this.key = key;
            this.destination.next(value);
        }
    };
    return DistinctUntilChangedSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item.
 *
 * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
 *
 * If a comparator function is not provided, an equality check is used by default.
 *
 * @example <caption>A simple example with numbers</caption>
 * Observable.of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4)
 *   .distinctUntilChanged()
 *   .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4
 *
 * @example <caption>An example using a compare function</caption>
 * interface Person {
 *    age: number,
 *    name: string
 * }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'})
 *     { age: 6, name: 'Foo'})
 *     .distinctUntilChanged((p: Person, q: Person) => p.name === q.name)
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo' }
 *
 * @see {@link distinct}
 * @see {@link distinctUntilKeyChanged}
 *
 * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values.
 * @method distinctUntilChanged
 * @owner Observable
 */
function distinctUntilChanged$$1(compare, keySelector) {
    return distinctUntilChanged$1(compare, keySelector)(this);
}

Observable.prototype.distinctUntilChanged = distinctUntilChanged$$1;

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item,
 * using a property accessed by using the key provided to check if the two items are distinct.
 *
 * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
 *
 * If a comparator function is not provided, an equality check is used by default.
 *
 * @example <caption>An example comparing the name of persons</caption>
 *
 *  interface Person {
 *     age: number,
 *     name: string
 *  }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'},
 *     { age: 6, name: 'Foo'})
 *     .distinctUntilKeyChanged('name')
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo' }
 *
 * @example <caption>An example comparing the first letters of the name</caption>
 *
 * interface Person {
 *     age: number,
 *     name: string
 *  }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo1'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo2'},
 *     { age: 6, name: 'Foo3'})
 *     .distinctUntilKeyChanged('name', (x: string, y: string) => x.substring(0, 3) === y.substring(0, 3))
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo1' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo2' }
 *
 * @see {@link distinct}
 * @see {@link distinctUntilChanged}
 *
 * @param {string} key String key for object property lookup on each item.
 * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values based on the key specified.
 * @method distinctUntilKeyChanged
 * @owner Observable
 */
function distinctUntilKeyChanged$1(key, compare) {
    return distinctUntilChanged$1(function (x, y) { return compare ? compare(x[key], y[key]) : x[key] === y[key]; });
}

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item,
 * using a property accessed by using the key provided to check if the two items are distinct.
 *
 * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
 *
 * If a comparator function is not provided, an equality check is used by default.
 *
 * @example <caption>An example comparing the name of persons</caption>
 *
 *  interface Person {
 *     age: number,
 *     name: string
 *  }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'},
 *     { age: 6, name: 'Foo'})
 *     .distinctUntilKeyChanged('name')
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo' }
 *
 * @example <caption>An example comparing the first letters of the name</caption>
 *
 * interface Person {
 *     age: number,
 *     name: string
 *  }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo1'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo2'},
 *     { age: 6, name: 'Foo3'})
 *     .distinctUntilKeyChanged('name', (x: string, y: string) => x.substring(0, 3) === y.substring(0, 3))
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo1' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo2' }
 *
 * @see {@link distinct}
 * @see {@link distinctUntilChanged}
 *
 * @param {string} key String key for object property lookup on each item.
 * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values based on the key specified.
 * @method distinctUntilKeyChanged
 * @owner Observable
 */
function distinctUntilKeyChanged$$1(key, compare) {
    return distinctUntilKeyChanged$1(key, compare)(this);
}

Observable.prototype.distinctUntilKeyChanged = distinctUntilKeyChanged$$1;

/* tslint:enable:max-line-length */
/**
 * Perform a side effect for every emission on the source Observable, but return
 * an Observable that is identical to the source.
 *
 * <span class="informal">Intercepts each emission on the source and runs a
 * function, but returns an output which is identical to the source as long as errors don't occur.</span>
 *
 * <img src="./img/do.png" width="100%">
 *
 * Returns a mirrored Observable of the source Observable, but modified so that
 * the provided Observer is called to perform a side effect for every value,
 * error, and completion emitted by the source. Any errors that are thrown in
 * the aforementioned Observer or handlers are safely sent down the error path
 * of the output Observable.
 *
 * This operator is useful for debugging your Observables for the correct values
 * or performing other side effects.
 *
 * Note: this is different to a `subscribe` on the Observable. If the Observable
 * returned by `do` is not subscribed, the side effects specified by the
 * Observer will never happen. `do` therefore simply spies on existing
 * execution, it does not trigger an execution to happen like `subscribe` does.
 *
 * @example <caption>Map every click to the clientX position of that click, while also logging the click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var positions = clicks
 *   .do(ev => console.log(ev))
 *   .map(ev => ev.clientX);
 * positions.subscribe(x => console.log(x));
 *
 * @see {@link map}
 * @see {@link subscribe}
 *
 * @param {Observer|function} [nextOrObserver] A normal Observer object or a
 * callback for `next`.
 * @param {function} [error] Callback for errors in the source.
 * @param {function} [complete] Callback for the completion of the source.
 * @return {Observable} An Observable identical to the source, but runs the
 * specified Observer or callback(s) for each item.
 * @name tap
 */
function tap(nextOrObserver, error, complete) {
    return function tapOperatorFunction(source) {
        return source.lift(new DoOperator(nextOrObserver, error, complete));
    };
}
var DoOperator = (function () {
    function DoOperator(nextOrObserver, error, complete) {
        this.nextOrObserver = nextOrObserver;
        this.error = error;
        this.complete = complete;
    }
    DoOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DoSubscriber(subscriber, this.nextOrObserver, this.error, this.complete));
    };
    return DoOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DoSubscriber = (function (_super) {
    __extends(DoSubscriber, _super);
    function DoSubscriber(destination, nextOrObserver, error, complete) {
        _super.call(this, destination);
        var safeSubscriber = new Subscriber(nextOrObserver, error, complete);
        safeSubscriber.syncErrorThrowable = true;
        this.add(safeSubscriber);
        this.safeSubscriber = safeSubscriber;
    }
    DoSubscriber.prototype._next = function (value) {
        var safeSubscriber = this.safeSubscriber;
        safeSubscriber.next(value);
        if (safeSubscriber.syncErrorThrown) {
            this.destination.error(safeSubscriber.syncErrorValue);
        }
        else {
            this.destination.next(value);
        }
    };
    DoSubscriber.prototype._error = function (err) {
        var safeSubscriber = this.safeSubscriber;
        safeSubscriber.error(err);
        if (safeSubscriber.syncErrorThrown) {
            this.destination.error(safeSubscriber.syncErrorValue);
        }
        else {
            this.destination.error(err);
        }
    };
    DoSubscriber.prototype._complete = function () {
        var safeSubscriber = this.safeSubscriber;
        safeSubscriber.complete();
        if (safeSubscriber.syncErrorThrown) {
            this.destination.error(safeSubscriber.syncErrorValue);
        }
        else {
            this.destination.complete();
        }
    };
    return DoSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Perform a side effect for every emission on the source Observable, but return
 * an Observable that is identical to the source.
 *
 * <span class="informal">Intercepts each emission on the source and runs a
 * function, but returns an output which is identical to the source as long as errors don't occur.</span>
 *
 * <img src="./img/do.png" width="100%">
 *
 * Returns a mirrored Observable of the source Observable, but modified so that
 * the provided Observer is called to perform a side effect for every value,
 * error, and completion emitted by the source. Any errors that are thrown in
 * the aforementioned Observer or handlers are safely sent down the error path
 * of the output Observable.
 *
 * This operator is useful for debugging your Observables for the correct values
 * or performing other side effects.
 *
 * Note: this is different to a `subscribe` on the Observable. If the Observable
 * returned by `do` is not subscribed, the side effects specified by the
 * Observer will never happen. `do` therefore simply spies on existing
 * execution, it does not trigger an execution to happen like `subscribe` does.
 *
 * @example <caption>Map every click to the clientX position of that click, while also logging the click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var positions = clicks
 *   .do(ev => console.log(ev))
 *   .map(ev => ev.clientX);
 * positions.subscribe(x => console.log(x));
 *
 * @see {@link map}
 * @see {@link subscribe}
 *
 * @param {Observer|function} [nextOrObserver] A normal Observer object or a
 * callback for `next`.
 * @param {function} [error] Callback for errors in the source.
 * @param {function} [complete] Callback for the completion of the source.
 * @return {Observable} An Observable identical to the source, but runs the
 * specified Observer or callback(s) for each item.
 * @method do
 * @name do
 * @owner Observable
 */
function _do(nextOrObserver, error, complete) {
    return tap(nextOrObserver, error, complete)(this);
}

Observable.prototype.do = _do;
Observable.prototype._do = _do;

/**
 * Converts a higher-order Observable into a first-order Observable by dropping
 * inner Observables while the previous inner Observable has not yet completed.
 *
 * <span class="informal">Flattens an Observable-of-Observables by dropping the
 * next inner Observables while the current inner is still executing.</span>
 *
 * <img src="./img/exhaust.png" width="100%">
 *
 * `exhaust` subscribes to an Observable that emits Observables, also known as a
 * higher-order Observable. Each time it observes one of these emitted inner
 * Observables, the output Observable begins emitting the items emitted by that
 * inner Observable. So far, it behaves like {@link mergeAll}. However,
 * `exhaust` ignores every new inner Observable if the previous Observable has
 * not yet completed. Once that one completes, it will accept and flatten the
 * next inner Observable and repeat this process.
 *
 * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(5));
 * var result = higherOrder.exhaust();
 * result.subscribe(x => console.log(x));
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link switch}
 * @see {@link mergeAll}
 * @see {@link exhaustMap}
 * @see {@link zipAll}
 *
 * @return {Observable} An Observable that takes a source of Observables and propagates the first observable
 * exclusively until it completes before subscribing to the next.
 * @method exhaust
 * @owner Observable
 */
function exhaust$1() {
    return function (source) { return source.lift(new SwitchFirstOperator()); };
}
var SwitchFirstOperator = (function () {
    function SwitchFirstOperator() {
    }
    SwitchFirstOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SwitchFirstSubscriber(subscriber));
    };
    return SwitchFirstOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SwitchFirstSubscriber = (function (_super) {
    __extends(SwitchFirstSubscriber, _super);
    function SwitchFirstSubscriber(destination) {
        _super.call(this, destination);
        this.hasCompleted = false;
        this.hasSubscription = false;
    }
    SwitchFirstSubscriber.prototype._next = function (value) {
        if (!this.hasSubscription) {
            this.hasSubscription = true;
            this.add(subscribeToResult(this, value));
        }
    };
    SwitchFirstSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (!this.hasSubscription) {
            this.destination.complete();
        }
    };
    SwitchFirstSubscriber.prototype.notifyComplete = function (innerSub) {
        this.remove(innerSub);
        this.hasSubscription = false;
        if (this.hasCompleted) {
            this.destination.complete();
        }
    };
    return SwitchFirstSubscriber;
}(OuterSubscriber));

/**
 * Converts a higher-order Observable into a first-order Observable by dropping
 * inner Observables while the previous inner Observable has not yet completed.
 *
 * <span class="informal">Flattens an Observable-of-Observables by dropping the
 * next inner Observables while the current inner is still executing.</span>
 *
 * <img src="./img/exhaust.png" width="100%">
 *
 * `exhaust` subscribes to an Observable that emits Observables, also known as a
 * higher-order Observable. Each time it observes one of these emitted inner
 * Observables, the output Observable begins emitting the items emitted by that
 * inner Observable. So far, it behaves like {@link mergeAll}. However,
 * `exhaust` ignores every new inner Observable if the previous Observable has
 * not yet completed. Once that one completes, it will accept and flatten the
 * next inner Observable and repeat this process.
 *
 * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(5));
 * var result = higherOrder.exhaust();
 * result.subscribe(x => console.log(x));
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link switch}
 * @see {@link mergeAll}
 * @see {@link exhaustMap}
 * @see {@link zipAll}
 *
 * @return {Observable} An Observable that takes a source of Observables and propagates the first observable
 * exclusively until it completes before subscribing to the next.
 * @method exhaust
 * @owner Observable
 */
function exhaust$$1() {
    return exhaust$1()(this);
}

Observable.prototype.exhaust = exhaust$$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable only if the previous projected Observable has completed.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link exhaust}.</span>
 *
 * <img src="./img/exhaustMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. When it projects a source value to
 * an Observable, the output Observable begins emitting the items emitted by
 * that projected Observable. However, `exhaustMap` ignores every new projected
 * Observable if the previous projected Observable has not yet completed. Once
 * that one completes, it will accept and flatten the next projected Observable
 * and repeat this process.
 *
 * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.exhaustMap((ev) => Rx.Observable.interval(1000).take(5));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMap}
 * @see {@link exhaust}
 * @see {@link mergeMap}
 * @see {@link switchMap}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable containing projected Observables
 * of each item of the source, ignoring projected Observables that start before
 * their preceding Observable has completed.
 * @method exhaustMap
 * @owner Observable
 */
function exhaustMap$1(project, resultSelector) {
    return function (source) { return source.lift(new SwitchFirstMapOperator(project, resultSelector)); };
}
var SwitchFirstMapOperator = (function () {
    function SwitchFirstMapOperator(project, resultSelector) {
        this.project = project;
        this.resultSelector = resultSelector;
    }
    SwitchFirstMapOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SwitchFirstMapSubscriber(subscriber, this.project, this.resultSelector));
    };
    return SwitchFirstMapOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SwitchFirstMapSubscriber = (function (_super) {
    __extends(SwitchFirstMapSubscriber, _super);
    function SwitchFirstMapSubscriber(destination, project, resultSelector) {
        _super.call(this, destination);
        this.project = project;
        this.resultSelector = resultSelector;
        this.hasSubscription = false;
        this.hasCompleted = false;
        this.index = 0;
    }
    SwitchFirstMapSubscriber.prototype._next = function (value) {
        if (!this.hasSubscription) {
            this.tryNext(value);
        }
    };
    SwitchFirstMapSubscriber.prototype.tryNext = function (value) {
        var index = this.index++;
        var destination = this.destination;
        try {
            var result = this.project(value, index);
            this.hasSubscription = true;
            this.add(subscribeToResult(this, result, value, index));
        }
        catch (err) {
            destination.error(err);
        }
    };
    SwitchFirstMapSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (!this.hasSubscription) {
            this.destination.complete();
        }
    };
    SwitchFirstMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        if (resultSelector) {
            this.trySelectResult(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            destination.next(innerValue);
        }
    };
    SwitchFirstMapSubscriber.prototype.trySelectResult = function (outerValue, innerValue, outerIndex, innerIndex) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        try {
            var result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
            destination.next(result);
        }
        catch (err) {
            destination.error(err);
        }
    };
    SwitchFirstMapSubscriber.prototype.notifyError = function (err) {
        this.destination.error(err);
    };
    SwitchFirstMapSubscriber.prototype.notifyComplete = function (innerSub) {
        this.remove(innerSub);
        this.hasSubscription = false;
        if (this.hasCompleted) {
            this.destination.complete();
        }
    };
    return SwitchFirstMapSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable only if the previous projected Observable has completed.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link exhaust}.</span>
 *
 * <img src="./img/exhaustMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. When it projects a source value to
 * an Observable, the output Observable begins emitting the items emitted by
 * that projected Observable. However, `exhaustMap` ignores every new projected
 * Observable if the previous projected Observable has not yet completed. Once
 * that one completes, it will accept and flatten the next projected Observable
 * and repeat this process.
 *
 * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.exhaustMap((ev) => Rx.Observable.interval(1000).take(5));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMap}
 * @see {@link exhaust}
 * @see {@link mergeMap}
 * @see {@link switchMap}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable containing projected Observables
 * of each item of the source, ignoring projected Observables that start before
 * their preceding Observable has completed.
 * @method exhaustMap
 * @owner Observable
 */
function exhaustMap$$1(project, resultSelector) {
    return exhaustMap$1(project, resultSelector)(this);
}

Observable.prototype.exhaustMap = exhaustMap$$1;

/* tslint:enable:max-line-length */
/**
 * Recursively projects each source value to an Observable which is merged in
 * the output Observable.
 *
 * <span class="informal">It's similar to {@link mergeMap}, but applies the
 * projection function to every source value as well as every output value.
 * It's recursive.</span>
 *
 * <img src="./img/expand.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an Observable, and then merging those resulting Observables and
 * emitting the results of this merger. *Expand* will re-emit on the output
 * Observable every source value. Then, each output value is given to the
 * `project` function which returns an inner Observable to be merged on the
 * output Observable. Those output values resulting from the projection are also
 * given to the `project` function to produce new output values. This is how
 * *expand* behaves recursively.
 *
 * @example <caption>Start emitting the powers of two on every click, at most 10 of them</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var powersOfTwo = clicks
 *   .mapTo(1)
 *   .expand(x => Rx.Observable.of(2 * x).delay(1000))
 *   .take(10);
 * powersOfTwo.subscribe(x => console.log(x));
 *
 * @see {@link mergeMap}
 * @see {@link mergeScan}
 *
 * @param {function(value: T, index: number) => Observable} project A function
 * that, when applied to an item emitted by the source or the output Observable,
 * returns an Observable.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @param {Scheduler} [scheduler=null] The IScheduler to use for subscribing to
 * each projected inner Observable.
 * @return {Observable} An Observable that emits the source values and also
 * result of applying the projection function to each value emitted on the
 * output Observable and and merging the results of the Observables obtained
 * from this transformation.
 * @method expand
 * @owner Observable
 */
function expand$1(project, concurrent, scheduler) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    if (scheduler === void 0) { scheduler = undefined; }
    concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
    return function (source) { return source.lift(new ExpandOperator(project, concurrent, scheduler)); };
}
var ExpandOperator = (function () {
    function ExpandOperator(project, concurrent, scheduler) {
        this.project = project;
        this.concurrent = concurrent;
        this.scheduler = scheduler;
    }
    ExpandOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler));
    };
    return ExpandOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ExpandSubscriber = (function (_super) {
    __extends(ExpandSubscriber, _super);
    function ExpandSubscriber(destination, project, concurrent, scheduler) {
        _super.call(this, destination);
        this.project = project;
        this.concurrent = concurrent;
        this.scheduler = scheduler;
        this.index = 0;
        this.active = 0;
        this.hasCompleted = false;
        if (concurrent < Number.POSITIVE_INFINITY) {
            this.buffer = [];
        }
    }
    ExpandSubscriber.dispatch = function (arg) {
        var subscriber = arg.subscriber, result = arg.result, value = arg.value, index = arg.index;
        subscriber.subscribeToProjection(result, value, index);
    };
    ExpandSubscriber.prototype._next = function (value) {
        var destination = this.destination;
        if (destination.closed) {
            this._complete();
            return;
        }
        var index = this.index++;
        if (this.active < this.concurrent) {
            destination.next(value);
            var result = tryCatch(this.project)(value, index);
            if (result === errorObject) {
                destination.error(errorObject.e);
            }
            else if (!this.scheduler) {
                this.subscribeToProjection(result, value, index);
            }
            else {
                var state = { subscriber: this, result: result, value: value, index: index };
                this.add(this.scheduler.schedule(ExpandSubscriber.dispatch, 0, state));
            }
        }
        else {
            this.buffer.push(value);
        }
    };
    ExpandSubscriber.prototype.subscribeToProjection = function (result, value, index) {
        this.active++;
        this.add(subscribeToResult(this, result, value, index));
    };
    ExpandSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (this.hasCompleted && this.active === 0) {
            this.destination.complete();
        }
    };
    ExpandSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this._next(innerValue);
    };
    ExpandSubscriber.prototype.notifyComplete = function (innerSub) {
        var buffer = this.buffer;
        this.remove(innerSub);
        this.active--;
        if (buffer && buffer.length > 0) {
            this._next(buffer.shift());
        }
        if (this.hasCompleted && this.active === 0) {
            this.destination.complete();
        }
    };
    return ExpandSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 * Recursively projects each source value to an Observable which is merged in
 * the output Observable.
 *
 * <span class="informal">It's similar to {@link mergeMap}, but applies the
 * projection function to every source value as well as every output value.
 * It's recursive.</span>
 *
 * <img src="./img/expand.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an Observable, and then merging those resulting Observables and
 * emitting the results of this merger. *Expand* will re-emit on the output
 * Observable every source value. Then, each output value is given to the
 * `project` function which returns an inner Observable to be merged on the
 * output Observable. Those output values resulting from the projection are also
 * given to the `project` function to produce new output values. This is how
 * *expand* behaves recursively.
 *
 * @example <caption>Start emitting the powers of two on every click, at most 10 of them</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var powersOfTwo = clicks
 *   .mapTo(1)
 *   .expand(x => Rx.Observable.of(2 * x).delay(1000))
 *   .take(10);
 * powersOfTwo.subscribe(x => console.log(x));
 *
 * @see {@link mergeMap}
 * @see {@link mergeScan}
 *
 * @param {function(value: T, index: number) => Observable} project A function
 * that, when applied to an item emitted by the source or the output Observable,
 * returns an Observable.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @param {Scheduler} [scheduler=null] The IScheduler to use for subscribing to
 * each projected inner Observable.
 * @return {Observable} An Observable that emits the source values and also
 * result of applying the projection function to each value emitted on the
 * output Observable and and merging the results of the Observables obtained
 * from this transformation.
 * @method expand
 * @owner Observable
 */
function expand$$1(project, concurrent, scheduler) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    if (scheduler === void 0) { scheduler = undefined; }
    concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
    return expand$1(project, concurrent, scheduler)(this);
}

Observable.prototype.expand = expand$$1;

/**
 * An error thrown when an element was queried at a certain index of an
 * Observable, but no such index or position exists in that sequence.
 *
 * @see {@link elementAt}
 * @see {@link take}
 * @see {@link takeLast}
 *
 * @class ArgumentOutOfRangeError
 */
var ArgumentOutOfRangeError = (function (_super) {
    __extends(ArgumentOutOfRangeError, _super);
    function ArgumentOutOfRangeError() {
        var err = _super.call(this, 'argument out of range');
        this.name = err.name = 'ArgumentOutOfRangeError';
        this.stack = err.stack;
        this.message = err.message;
    }
    return ArgumentOutOfRangeError;
}(Error));

/**
 * Emits the single value at the specified `index` in a sequence of emissions
 * from the source Observable.
 *
 * <span class="informal">Emits only the i-th value, then completes.</span>
 *
 * <img src="./img/elementAt.png" width="100%">
 *
 * `elementAt` returns an Observable that emits the item at the specified
 * `index` in the source Observable, or a default value if that `index` is out
 * of range and the `default` argument is provided. If the `default` argument is
 * not given and the `index` is out of range, the output Observable will emit an
 * `ArgumentOutOfRangeError` error.
 *
 * @example <caption>Emit only the third click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.elementAt(2);
 * result.subscribe(x => console.log(x));
 *
 * // Results in:
 * // click 1 = nothing
 * // click 2 = nothing
 * // click 3 = MouseEvent object logged to console
 *
 * @see {@link first}
 * @see {@link last}
 * @see {@link skip}
 * @see {@link single}
 * @see {@link take}
 *
 * @throws {ArgumentOutOfRangeError} When using `elementAt(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0` or the
 * Observable has completed before emitting the i-th `next` notification.
 *
 * @param {number} index Is the number `i` for the i-th source emission that has
 * happened since the subscription, starting from the number `0`.
 * @param {T} [defaultValue] The default value returned for missing indices.
 * @return {Observable} An Observable that emits a single item, if it is found.
 * Otherwise, will emit the default value if given. If not, then emits an error.
 * @method elementAt
 * @owner Observable
 */
function elementAt$1(index, defaultValue) {
    return function (source) { return source.lift(new ElementAtOperator(index, defaultValue)); };
}
var ElementAtOperator = (function () {
    function ElementAtOperator(index, defaultValue) {
        this.index = index;
        this.defaultValue = defaultValue;
        if (index < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    ElementAtOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ElementAtSubscriber(subscriber, this.index, this.defaultValue));
    };
    return ElementAtOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ElementAtSubscriber = (function (_super) {
    __extends(ElementAtSubscriber, _super);
    function ElementAtSubscriber(destination, index, defaultValue) {
        _super.call(this, destination);
        this.index = index;
        this.defaultValue = defaultValue;
    }
    ElementAtSubscriber.prototype._next = function (x) {
        if (this.index-- === 0) {
            this.destination.next(x);
            this.destination.complete();
        }
    };
    ElementAtSubscriber.prototype._complete = function () {
        var destination = this.destination;
        if (this.index >= 0) {
            if (typeof this.defaultValue !== 'undefined') {
                destination.next(this.defaultValue);
            }
            else {
                destination.error(new ArgumentOutOfRangeError);
            }
        }
        destination.complete();
    };
    return ElementAtSubscriber;
}(Subscriber));

/**
 * Emits the single value at the specified `index` in a sequence of emissions
 * from the source Observable.
 *
 * <span class="informal">Emits only the i-th value, then completes.</span>
 *
 * <img src="./img/elementAt.png" width="100%">
 *
 * `elementAt` returns an Observable that emits the item at the specified
 * `index` in the source Observable, or a default value if that `index` is out
 * of range and the `default` argument is provided. If the `default` argument is
 * not given and the `index` is out of range, the output Observable will emit an
 * `ArgumentOutOfRangeError` error.
 *
 * @example <caption>Emit only the third click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.elementAt(2);
 * result.subscribe(x => console.log(x));
 *
 * // Results in:
 * // click 1 = nothing
 * // click 2 = nothing
 * // click 3 = MouseEvent object logged to console
 *
 * @see {@link first}
 * @see {@link last}
 * @see {@link skip}
 * @see {@link single}
 * @see {@link take}
 *
 * @throws {ArgumentOutOfRangeError} When using `elementAt(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0` or the
 * Observable has completed before emitting the i-th `next` notification.
 *
 * @param {number} index Is the number `i` for the i-th source emission that has
 * happened since the subscription, starting from the number `0`.
 * @param {T} [defaultValue] The default value returned for missing indices.
 * @return {Observable} An Observable that emits a single item, if it is found.
 * Otherwise, will emit the default value if given. If not, then emits an error.
 * @method elementAt
 * @owner Observable
 */
function elementAt$$1(index, defaultValue) {
    return elementAt$1(index, defaultValue)(this);
}

Observable.prototype.elementAt = elementAt$$1;

/* tslint:enable:max-line-length */
/**
 * Filter items emitted by the source Observable by only emitting those that
 * satisfy a specified predicate.
 *
 * <span class="informal">Like
 * [Array.prototype.filter()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter),
 * it only emits a value from the source if it passes a criterion function.</span>
 *
 * <img src="./img/filter.png" width="100%">
 *
 * Similar to the well-known `Array.prototype.filter` method, this operator
 * takes values from the source Observable, passes them through a `predicate`
 * function and only emits those values that yielded `true`.
 *
 * @example <caption>Emit only click events whose target was a DIV element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var clicksOnDivs = clicks.filter(ev => ev.target.tagName === 'DIV');
 * clicksOnDivs.subscribe(x => console.log(x));
 *
 * @see {@link distinct}
 * @see {@link distinctUntilChanged}
 * @see {@link distinctUntilKeyChanged}
 * @see {@link ignoreElements}
 * @see {@link partition}
 * @see {@link skip}
 *
 * @param {function(value: T, index: number): boolean} predicate A function that
 * evaluates each value emitted by the source Observable. If it returns `true`,
 * the value is emitted, if `false` the value is not passed to the output
 * Observable. The `index` parameter is the number `i` for the i-th source
 * emission that has happened since the subscription, starting from the number
 * `0`.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {Observable} An Observable of values from the source that were
 * allowed by the `predicate` function.
 * @method filter
 * @owner Observable
 */
function filter$1(predicate, thisArg) {
    return function filterOperatorFunction(source) {
        return source.lift(new FilterOperator(predicate, thisArg));
    };
}
var FilterOperator = (function () {
    function FilterOperator(predicate, thisArg) {
        this.predicate = predicate;
        this.thisArg = thisArg;
    }
    FilterOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new FilterSubscriber(subscriber, this.predicate, this.thisArg));
    };
    return FilterOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var FilterSubscriber = (function (_super) {
    __extends(FilterSubscriber, _super);
    function FilterSubscriber(destination, predicate, thisArg) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.thisArg = thisArg;
        this.count = 0;
    }
    // the try catch block below is left specifically for
    // optimization and perf reasons. a tryCatcher is not necessary here.
    FilterSubscriber.prototype._next = function (value) {
        var result;
        try {
            result = this.predicate.call(this.thisArg, value, this.count++);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        if (result) {
            this.destination.next(value);
        }
    };
    return FilterSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Filter items emitted by the source Observable by only emitting those that
 * satisfy a specified predicate.
 *
 * <span class="informal">Like
 * [Array.prototype.filter()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter),
 * it only emits a value from the source if it passes a criterion function.</span>
 *
 * <img src="./img/filter.png" width="100%">
 *
 * Similar to the well-known `Array.prototype.filter` method, this operator
 * takes values from the source Observable, passes them through a `predicate`
 * function and only emits those values that yielded `true`.
 *
 * @example <caption>Emit only click events whose target was a DIV element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var clicksOnDivs = clicks.filter(ev => ev.target.tagName === 'DIV');
 * clicksOnDivs.subscribe(x => console.log(x));
 *
 * @see {@link distinct}
 * @see {@link distinctUntilChanged}
 * @see {@link distinctUntilKeyChanged}
 * @see {@link ignoreElements}
 * @see {@link partition}
 * @see {@link skip}
 *
 * @param {function(value: T, index: number): boolean} predicate A function that
 * evaluates each value emitted by the source Observable. If it returns `true`,
 * the value is emitted, if `false` the value is not passed to the output
 * Observable. The `index` parameter is the number `i` for the i-th source
 * emission that has happened since the subscription, starting from the number
 * `0`.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {Observable} An Observable of values from the source that were
 * allowed by the `predicate` function.
 * @method filter
 * @owner Observable
 */
function filter$$1(predicate, thisArg) {
    return filter$1(predicate, thisArg)(this);
}

Observable.prototype.filter = filter$$1;

/**
 * Returns an Observable that mirrors the source Observable, but will call a specified function when
 * the source terminates on complete or error.
 * @param {function} callback Function to be called when source terminates.
 * @return {Observable} An Observable that mirrors the source, but will call the specified function on termination.
 * @method finally
 * @owner Observable
 */
function finalize(callback) {
    return function (source) { return source.lift(new FinallyOperator(callback)); };
}
var FinallyOperator = (function () {
    function FinallyOperator(callback) {
        this.callback = callback;
    }
    FinallyOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new FinallySubscriber(subscriber, this.callback));
    };
    return FinallyOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var FinallySubscriber = (function (_super) {
    __extends(FinallySubscriber, _super);
    function FinallySubscriber(destination, callback) {
        _super.call(this, destination);
        this.add(new Subscription(callback));
    }
    return FinallySubscriber;
}(Subscriber));

/**
 * Returns an Observable that mirrors the source Observable, but will call a specified function when
 * the source terminates on complete or error.
 * @param {function} callback Function to be called when source terminates.
 * @return {Observable} An Observable that mirrors the source, but will call the specified function on termination.
 * @method finally
 * @owner Observable
 */
function _finally(callback) {
    return finalize(callback)(this);
}

Observable.prototype.finally = _finally;
Observable.prototype._finally = _finally;

/**
 * Emits only the first value emitted by the source Observable that meets some
 * condition.
 *
 * <span class="informal">Finds the first value that passes some test and emits
 * that.</span>
 *
 * <img src="./img/find.png" width="100%">
 *
 * `find` searches for the first item in the source Observable that matches the
 * specified condition embodied by the `predicate`, and returns the first
 * occurrence in the source. Unlike {@link first}, the `predicate` is required
 * in `find`, and does not emit an error if a valid value is not found.
 *
 * @example <caption>Find and emit the first click that happens on a DIV element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.find(ev => ev.target.tagName === 'DIV');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link filter}
 * @see {@link first}
 * @see {@link findIndex}
 * @see {@link take}
 *
 * @param {function(value: T, index: number, source: Observable<T>): boolean} predicate
 * A function called with each item to test for condition matching.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {Observable<T>} An Observable of the first item that matches the
 * condition.
 * @method find
 * @owner Observable
 */
function find$1(predicate, thisArg) {
    if (typeof predicate !== 'function') {
        throw new TypeError('predicate is not a function');
    }
    return function (source) { return source.lift(new FindValueOperator(predicate, source, false, thisArg)); };
}
var FindValueOperator = (function () {
    function FindValueOperator(predicate, source, yieldIndex, thisArg) {
        this.predicate = predicate;
        this.source = source;
        this.yieldIndex = yieldIndex;
        this.thisArg = thisArg;
    }
    FindValueOperator.prototype.call = function (observer, source) {
        return source.subscribe(new FindValueSubscriber(observer, this.predicate, this.source, this.yieldIndex, this.thisArg));
    };
    return FindValueOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var FindValueSubscriber = (function (_super) {
    __extends(FindValueSubscriber, _super);
    function FindValueSubscriber(destination, predicate, source, yieldIndex, thisArg) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.source = source;
        this.yieldIndex = yieldIndex;
        this.thisArg = thisArg;
        this.index = 0;
    }
    FindValueSubscriber.prototype.notifyComplete = function (value) {
        var destination = this.destination;
        destination.next(value);
        destination.complete();
    };
    FindValueSubscriber.prototype._next = function (value) {
        var _a = this, predicate = _a.predicate, thisArg = _a.thisArg;
        var index = this.index++;
        try {
            var result = predicate.call(thisArg || this, value, index, this.source);
            if (result) {
                this.notifyComplete(this.yieldIndex ? index : value);
            }
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    FindValueSubscriber.prototype._complete = function () {
        this.notifyComplete(this.yieldIndex ? -1 : undefined);
    };
    return FindValueSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Emits only the first value emitted by the source Observable that meets some
 * condition.
 *
 * <span class="informal">Finds the first value that passes some test and emits
 * that.</span>
 *
 * <img src="./img/find.png" width="100%">
 *
 * `find` searches for the first item in the source Observable that matches the
 * specified condition embodied by the `predicate`, and returns the first
 * occurrence in the source. Unlike {@link first}, the `predicate` is required
 * in `find`, and does not emit an error if a valid value is not found.
 *
 * @example <caption>Find and emit the first click that happens on a DIV element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.find(ev => ev.target.tagName === 'DIV');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link filter}
 * @see {@link first}
 * @see {@link findIndex}
 * @see {@link take}
 *
 * @param {function(value: T, index: number, source: Observable<T>): boolean} predicate
 * A function called with each item to test for condition matching.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {Observable<T>} An Observable of the first item that matches the
 * condition.
 * @method find
 * @owner Observable
 */
function find$$1(predicate, thisArg) {
    return find$1(predicate, thisArg)(this);
}

Observable.prototype.find = find$$1;

/**
 * Emits only the index of the first value emitted by the source Observable that
 * meets some condition.
 *
 * <span class="informal">It's like {@link find}, but emits the index of the
 * found value, not the value itself.</span>
 *
 * <img src="./img/findIndex.png" width="100%">
 *
 * `findIndex` searches for the first item in the source Observable that matches
 * the specified condition embodied by the `predicate`, and returns the
 * (zero-based) index of the first occurrence in the source. Unlike
 * {@link first}, the `predicate` is required in `findIndex`, and does not emit
 * an error if a valid value is not found.
 *
 * @example <caption>Emit the index of first click that happens on a DIV element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.findIndex(ev => ev.target.tagName === 'DIV');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link filter}
 * @see {@link find}
 * @see {@link first}
 * @see {@link take}
 *
 * @param {function(value: T, index: number, source: Observable<T>): boolean} predicate
 * A function called with each item to test for condition matching.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {Observable} An Observable of the index of the first item that
 * matches the condition.
 * @method find
 * @owner Observable
 */
function findIndex$1(predicate, thisArg) {
    return function (source) { return source.lift(new FindValueOperator(predicate, source, true, thisArg)); };
}

/**
 * Emits only the index of the first value emitted by the source Observable that
 * meets some condition.
 *
 * <span class="informal">It's like {@link find}, but emits the index of the
 * found value, not the value itself.</span>
 *
 * <img src="./img/findIndex.png" width="100%">
 *
 * `findIndex` searches for the first item in the source Observable that matches
 * the specified condition embodied by the `predicate`, and returns the
 * (zero-based) index of the first occurrence in the source. Unlike
 * {@link first}, the `predicate` is required in `findIndex`, and does not emit
 * an error if a valid value is not found.
 *
 * @example <caption>Emit the index of first click that happens on a DIV element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.findIndex(ev => ev.target.tagName === 'DIV');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link filter}
 * @see {@link find}
 * @see {@link first}
 * @see {@link take}
 *
 * @param {function(value: T, index: number, source: Observable<T>): boolean} predicate
 * A function called with each item to test for condition matching.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {Observable} An Observable of the index of the first item that
 * matches the condition.
 * @method find
 * @owner Observable
 */
function findIndex$$1(predicate, thisArg) {
    return findIndex$1(predicate, thisArg)(this);
}

Observable.prototype.findIndex = findIndex$$1;

/**
 * An error thrown when an Observable or a sequence was queried but has no
 * elements.
 *
 * @see {@link first}
 * @see {@link last}
 * @see {@link single}
 *
 * @class EmptyError
 */
var EmptyError = (function (_super) {
    __extends(EmptyError, _super);
    function EmptyError() {
        var err = _super.call(this, 'no elements in sequence');
        this.name = err.name = 'EmptyError';
        this.stack = err.stack;
        this.message = err.message;
    }
    return EmptyError;
}(Error));

/**
 * Emits only the first value (or the first value that meets some condition)
 * emitted by the source Observable.
 *
 * <span class="informal">Emits only the first value. Or emits only the first
 * value that passes some test.</span>
 *
 * <img src="./img/first.png" width="100%">
 *
 * If called with no arguments, `first` emits the first value of the source
 * Observable, then completes. If called with a `predicate` function, `first`
 * emits the first value of the source that matches the specified condition. It
 * may also take a `resultSelector` function to produce the output value from
 * the input value, and a `defaultValue` to emit in case the source completes
 * before it is able to emit a valid value. Throws an error if `defaultValue`
 * was not provided and a matching element is not found.
 *
 * @example <caption>Emit only the first click that happens on the DOM</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.first();
 * result.subscribe(x => console.log(x));
 *
 * @example <caption>Emits the first click that happens on a DIV</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.first(ev => ev.target.tagName === 'DIV');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link filter}
 * @see {@link find}
 * @see {@link take}
 *
 * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
 * callback if the Observable completes before any `next` notification was sent.
 *
 * @param {function(value: T, index: number, source: Observable<T>): boolean} [predicate]
 * An optional function called with each item to test for condition matching.
 * @param {function(value: T, index: number): R} [resultSelector] A function to
 * produce the value on the output Observable based on the values
 * and the indices of the source Observable. The arguments passed to this
 * function are:
 * - `value`: the value that was emitted on the source.
 * - `index`: the "index" of the value from the source.
 * @param {R} [defaultValue] The default value emitted in case no valid value
 * was found on the source.
 * @return {Observable<T|R>} An Observable of the first item that matches the
 * condition.
 * @method first
 * @owner Observable
 */
function first$1(predicate, resultSelector, defaultValue) {
    return function (source) { return source.lift(new FirstOperator(predicate, resultSelector, defaultValue, source)); };
}
var FirstOperator = (function () {
    function FirstOperator(predicate, resultSelector, defaultValue, source) {
        this.predicate = predicate;
        this.resultSelector = resultSelector;
        this.defaultValue = defaultValue;
        this.source = source;
    }
    FirstOperator.prototype.call = function (observer, source) {
        return source.subscribe(new FirstSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source));
    };
    return FirstOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var FirstSubscriber = (function (_super) {
    __extends(FirstSubscriber, _super);
    function FirstSubscriber(destination, predicate, resultSelector, defaultValue, source) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.resultSelector = resultSelector;
        this.defaultValue = defaultValue;
        this.source = source;
        this.index = 0;
        this.hasCompleted = false;
        this._emitted = false;
    }
    FirstSubscriber.prototype._next = function (value) {
        var index = this.index++;
        if (this.predicate) {
            this._tryPredicate(value, index);
        }
        else {
            this._emit(value, index);
        }
    };
    FirstSubscriber.prototype._tryPredicate = function (value, index) {
        var result;
        try {
            result = this.predicate(value, index, this.source);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        if (result) {
            this._emit(value, index);
        }
    };
    FirstSubscriber.prototype._emit = function (value, index) {
        if (this.resultSelector) {
            this._tryResultSelector(value, index);
            return;
        }
        this._emitFinal(value);
    };
    FirstSubscriber.prototype._tryResultSelector = function (value, index) {
        var result;
        try {
            result = this.resultSelector(value, index);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this._emitFinal(result);
    };
    FirstSubscriber.prototype._emitFinal = function (value) {
        var destination = this.destination;
        if (!this._emitted) {
            this._emitted = true;
            destination.next(value);
            destination.complete();
            this.hasCompleted = true;
        }
    };
    FirstSubscriber.prototype._complete = function () {
        var destination = this.destination;
        if (!this.hasCompleted && typeof this.defaultValue !== 'undefined') {
            destination.next(this.defaultValue);
            destination.complete();
        }
        else if (!this.hasCompleted) {
            destination.error(new EmptyError);
        }
    };
    return FirstSubscriber;
}(Subscriber));

/**
 * Emits only the first value (or the first value that meets some condition)
 * emitted by the source Observable.
 *
 * <span class="informal">Emits only the first value. Or emits only the first
 * value that passes some test.</span>
 *
 * <img src="./img/first.png" width="100%">
 *
 * If called with no arguments, `first` emits the first value of the source
 * Observable, then completes. If called with a `predicate` function, `first`
 * emits the first value of the source that matches the specified condition. It
 * may also take a `resultSelector` function to produce the output value from
 * the input value, and a `defaultValue` to emit in case the source completes
 * before it is able to emit a valid value. Throws an error if `defaultValue`
 * was not provided and a matching element is not found.
 *
 * @example <caption>Emit only the first click that happens on the DOM</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.first();
 * result.subscribe(x => console.log(x));
 *
 * @example <caption>Emits the first click that happens on a DIV</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.first(ev => ev.target.tagName === 'DIV');
 * result.subscribe(x => console.log(x));
 *
 * @see {@link filter}
 * @see {@link find}
 * @see {@link take}
 *
 * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
 * callback if the Observable completes before any `next` notification was sent.
 *
 * @param {function(value: T, index: number, source: Observable<T>): boolean} [predicate]
 * An optional function called with each item to test for condition matching.
 * @param {function(value: T, index: number): R} [resultSelector] A function to
 * produce the value on the output Observable based on the values
 * and the indices of the source Observable. The arguments passed to this
 * function are:
 * - `value`: the value that was emitted on the source.
 * - `index`: the "index" of the value from the source.
 * @param {R} [defaultValue] The default value emitted in case no valid value
 * was found on the source.
 * @return {Observable<T|R>} An Observable of the first item that matches the
 * condition.
 * @method first
 * @owner Observable
 */
function first$$1(predicate, resultSelector, defaultValue) {
    return first$1(predicate, resultSelector, defaultValue)(this);
}

Observable.prototype.first = first$$1;

var MapPolyfill = (function () {
    function MapPolyfill() {
        this.size = 0;
        this._values = [];
        this._keys = [];
    }
    MapPolyfill.prototype.get = function (key) {
        var i = this._keys.indexOf(key);
        return i === -1 ? undefined : this._values[i];
    };
    MapPolyfill.prototype.set = function (key, value) {
        var i = this._keys.indexOf(key);
        if (i === -1) {
            this._keys.push(key);
            this._values.push(value);
            this.size++;
        }
        else {
            this._values[i] = value;
        }
        return this;
    };
    MapPolyfill.prototype.delete = function (key) {
        var i = this._keys.indexOf(key);
        if (i === -1) {
            return false;
        }
        this._values.splice(i, 1);
        this._keys.splice(i, 1);
        this.size--;
        return true;
    };
    MapPolyfill.prototype.clear = function () {
        this._keys.length = 0;
        this._values.length = 0;
        this.size = 0;
    };
    MapPolyfill.prototype.forEach = function (cb, thisArg) {
        for (var i = 0; i < this.size; i++) {
            cb.call(thisArg, this._values[i], this._keys[i]);
        }
    };
    return MapPolyfill;
}());

var Map = _root.Map || (function () { return MapPolyfill; })();

var FastMap = (function () {
    function FastMap() {
        this.values = {};
    }
    FastMap.prototype.delete = function (key) {
        this.values[key] = null;
        return true;
    };
    FastMap.prototype.set = function (key, value) {
        this.values[key] = value;
        return this;
    };
    FastMap.prototype.get = function (key) {
        return this.values[key];
    };
    FastMap.prototype.forEach = function (cb, thisArg) {
        var values = this.values;
        for (var key in values) {
            if (values.hasOwnProperty(key) && values[key] !== null) {
                cb.call(thisArg, values[key], key);
            }
        }
    };
    FastMap.prototype.clear = function () {
        this.values = {};
    };
    return FastMap;
}());

/* tslint:enable:max-line-length */
/**
 * Groups the items emitted by an Observable according to a specified criterion,
 * and emits these grouped items as `GroupedObservables`, one
 * {@link GroupedObservable} per group.
 *
 * <img src="./img/groupBy.png" width="100%">
 *
 * @example <caption>Group objects by id and return as array</caption>
 * Observable.of<Obj>({id: 1, name: 'aze1'},
 *                    {id: 2, name: 'sf2'},
 *                    {id: 2, name: 'dg2'},
 *                    {id: 1, name: 'erg1'},
 *                    {id: 1, name: 'df1'},
 *                    {id: 2, name: 'sfqfb2'},
 *                    {id: 3, name: 'qfs3'},
 *                    {id: 2, name: 'qsgqsfg2'}
 *     )
 *     .groupBy(p => p.id)
 *     .flatMap( (group$) => group$.reduce((acc, cur) => [...acc, cur], []))
 *     .subscribe(p => console.log(p));
 *
 * // displays:
 * // [ { id: 1, name: 'aze1' },
 * //   { id: 1, name: 'erg1' },
 * //   { id: 1, name: 'df1' } ]
 * //
 * // [ { id: 2, name: 'sf2' },
 * //   { id: 2, name: 'dg2' },
 * //   { id: 2, name: 'sfqfb2' },
 * //   { id: 2, name: 'qsgqsfg2' } ]
 * //
 * // [ { id: 3, name: 'qfs3' } ]
 *
 * @example <caption>Pivot data on the id field</caption>
 * Observable.of<Obj>({id: 1, name: 'aze1'},
 *                    {id: 2, name: 'sf2'},
 *                    {id: 2, name: 'dg2'},
 *                    {id: 1, name: 'erg1'},
 *                    {id: 1, name: 'df1'},
 *                    {id: 2, name: 'sfqfb2'},
 *                    {id: 3, name: 'qfs1'},
 *                    {id: 2, name: 'qsgqsfg2'}
 *                   )
 *     .groupBy(p => p.id, p => p.name)
 *     .flatMap( (group$) => group$.reduce((acc, cur) => [...acc, cur], ["" + group$.key]))
 *     .map(arr => ({'id': parseInt(arr[0]), 'values': arr.slice(1)}))
 *     .subscribe(p => console.log(p));
 *
 * // displays:
 * // { id: 1, values: [ 'aze1', 'erg1', 'df1' ] }
 * // { id: 2, values: [ 'sf2', 'dg2', 'sfqfb2', 'qsgqsfg2' ] }
 * // { id: 3, values: [ 'qfs1' ] }
 *
 * @param {function(value: T): K} keySelector A function that extracts the key
 * for each item.
 * @param {function(value: T): R} [elementSelector] A function that extracts the
 * return element for each item.
 * @param {function(grouped: GroupedObservable<K,R>): Observable<any>} [durationSelector]
 * A function that returns an Observable to determine how long each group should
 * exist.
 * @return {Observable<GroupedObservable<K,R>>} An Observable that emits
 * GroupedObservables, each of which corresponds to a unique key value and each
 * of which emits those items from the source Observable that share that key
 * value.
 * @method groupBy
 * @owner Observable
 */
function groupBy$1(keySelector, elementSelector, durationSelector, subjectSelector) {
    return function (source) {
        return source.lift(new GroupByOperator(keySelector, elementSelector, durationSelector, subjectSelector));
    };
}
var GroupByOperator = (function () {
    function GroupByOperator(keySelector, elementSelector, durationSelector, subjectSelector) {
        this.keySelector = keySelector;
        this.elementSelector = elementSelector;
        this.durationSelector = durationSelector;
        this.subjectSelector = subjectSelector;
    }
    GroupByOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new GroupBySubscriber(subscriber, this.keySelector, this.elementSelector, this.durationSelector, this.subjectSelector));
    };
    return GroupByOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var GroupBySubscriber = (function (_super) {
    __extends(GroupBySubscriber, _super);
    function GroupBySubscriber(destination, keySelector, elementSelector, durationSelector, subjectSelector) {
        _super.call(this, destination);
        this.keySelector = keySelector;
        this.elementSelector = elementSelector;
        this.durationSelector = durationSelector;
        this.subjectSelector = subjectSelector;
        this.groups = null;
        this.attemptedToUnsubscribe = false;
        this.count = 0;
    }
    GroupBySubscriber.prototype._next = function (value) {
        var key;
        try {
            key = this.keySelector(value);
        }
        catch (err) {
            this.error(err);
            return;
        }
        this._group(value, key);
    };
    GroupBySubscriber.prototype._group = function (value, key) {
        var groups = this.groups;
        if (!groups) {
            groups = this.groups = typeof key === 'string' ? new FastMap() : new Map();
        }
        var group = groups.get(key);
        var element;
        if (this.elementSelector) {
            try {
                element = this.elementSelector(value);
            }
            catch (err) {
                this.error(err);
            }
        }
        else {
            element = value;
        }
        if (!group) {
            group = this.subjectSelector ? this.subjectSelector() : new Subject();
            groups.set(key, group);
            var groupedObservable = new GroupedObservable(key, group, this);
            this.destination.next(groupedObservable);
            if (this.durationSelector) {
                var duration = void 0;
                try {
                    duration = this.durationSelector(new GroupedObservable(key, group));
                }
                catch (err) {
                    this.error(err);
                    return;
                }
                this.add(duration.subscribe(new GroupDurationSubscriber(key, group, this)));
            }
        }
        if (!group.closed) {
            group.next(element);
        }
    };
    GroupBySubscriber.prototype._error = function (err) {
        var groups = this.groups;
        if (groups) {
            groups.forEach(function (group, key) {
                group.error(err);
            });
            groups.clear();
        }
        this.destination.error(err);
    };
    GroupBySubscriber.prototype._complete = function () {
        var groups = this.groups;
        if (groups) {
            groups.forEach(function (group, key) {
                group.complete();
            });
            groups.clear();
        }
        this.destination.complete();
    };
    GroupBySubscriber.prototype.removeGroup = function (key) {
        this.groups.delete(key);
    };
    GroupBySubscriber.prototype.unsubscribe = function () {
        if (!this.closed) {
            this.attemptedToUnsubscribe = true;
            if (this.count === 0) {
                _super.prototype.unsubscribe.call(this);
            }
        }
    };
    return GroupBySubscriber;
}(Subscriber));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var GroupDurationSubscriber = (function (_super) {
    __extends(GroupDurationSubscriber, _super);
    function GroupDurationSubscriber(key, group, parent) {
        _super.call(this, group);
        this.key = key;
        this.group = group;
        this.parent = parent;
    }
    GroupDurationSubscriber.prototype._next = function (value) {
        this.complete();
    };
    /** @deprecated internal use only */ GroupDurationSubscriber.prototype._unsubscribe = function () {
        var _a = this, parent = _a.parent, key = _a.key;
        this.key = this.parent = null;
        if (parent) {
            parent.removeGroup(key);
        }
    };
    return GroupDurationSubscriber;
}(Subscriber));
/**
 * An Observable representing values belonging to the same group represented by
 * a common key. The values emitted by a GroupedObservable come from the source
 * Observable. The common key is available as the field `key` on a
 * GroupedObservable instance.
 *
 * @class GroupedObservable<K, T>
 */
var GroupedObservable = (function (_super) {
    __extends(GroupedObservable, _super);
    function GroupedObservable(key, groupSubject, refCountSubscription) {
        _super.call(this);
        this.key = key;
        this.groupSubject = groupSubject;
        this.refCountSubscription = refCountSubscription;
    }
    /** @deprecated internal use only */ GroupedObservable.prototype._subscribe = function (subscriber) {
        var subscription = new Subscription();
        var _a = this, refCountSubscription = _a.refCountSubscription, groupSubject = _a.groupSubject;
        if (refCountSubscription && !refCountSubscription.closed) {
            subscription.add(new InnerRefCountSubscription(refCountSubscription));
        }
        subscription.add(groupSubject.subscribe(subscriber));
        return subscription;
    };
    return GroupedObservable;
}(Observable));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var InnerRefCountSubscription = (function (_super) {
    __extends(InnerRefCountSubscription, _super);
    function InnerRefCountSubscription(parent) {
        _super.call(this);
        this.parent = parent;
        parent.count++;
    }
    InnerRefCountSubscription.prototype.unsubscribe = function () {
        var parent = this.parent;
        if (!parent.closed && !this.closed) {
            _super.prototype.unsubscribe.call(this);
            parent.count -= 1;
            if (parent.count === 0 && parent.attemptedToUnsubscribe) {
                parent.unsubscribe();
            }
        }
    };
    return InnerRefCountSubscription;
}(Subscription));

/* tslint:enable:max-line-length */
/**
 * Groups the items emitted by an Observable according to a specified criterion,
 * and emits these grouped items as `GroupedObservables`, one
 * {@link GroupedObservable} per group.
 *
 * <img src="./img/groupBy.png" width="100%">
 *
 * @example <caption>Group objects by id and return as array</caption>
 * Observable.of<Obj>({id: 1, name: 'aze1'},
 *                    {id: 2, name: 'sf2'},
 *                    {id: 2, name: 'dg2'},
 *                    {id: 1, name: 'erg1'},
 *                    {id: 1, name: 'df1'},
 *                    {id: 2, name: 'sfqfb2'},
 *                    {id: 3, name: 'qfs3'},
 *                    {id: 2, name: 'qsgqsfg2'}
 *     )
 *     .groupBy(p => p.id)
 *     .flatMap( (group$) => group$.reduce((acc, cur) => [...acc, cur], []))
 *     .subscribe(p => console.log(p));
 *
 * // displays:
 * // [ { id: 1, name: 'aze1' },
 * //   { id: 1, name: 'erg1' },
 * //   { id: 1, name: 'df1' } ]
 * //
 * // [ { id: 2, name: 'sf2' },
 * //   { id: 2, name: 'dg2' },
 * //   { id: 2, name: 'sfqfb2' },
 * //   { id: 2, name: 'qsgqsfg2' } ]
 * //
 * // [ { id: 3, name: 'qfs3' } ]
 *
 * @example <caption>Pivot data on the id field</caption>
 * Observable.of<Obj>({id: 1, name: 'aze1'},
 *                    {id: 2, name: 'sf2'},
 *                    {id: 2, name: 'dg2'},
 *                    {id: 1, name: 'erg1'},
 *                    {id: 1, name: 'df1'},
 *                    {id: 2, name: 'sfqfb2'},
 *                    {id: 3, name: 'qfs1'},
 *                    {id: 2, name: 'qsgqsfg2'}
 *                   )
 *     .groupBy(p => p.id, p => p.name)
 *     .flatMap( (group$) => group$.reduce((acc, cur) => [...acc, cur], ["" + group$.key]))
 *     .map(arr => ({'id': parseInt(arr[0]), 'values': arr.slice(1)}))
 *     .subscribe(p => console.log(p));
 *
 * // displays:
 * // { id: 1, values: [ 'aze1', 'erg1', 'df1' ] }
 * // { id: 2, values: [ 'sf2', 'dg2', 'sfqfb2', 'qsgqsfg2' ] }
 * // { id: 3, values: [ 'qfs1' ] }
 *
 * @param {function(value: T): K} keySelector A function that extracts the key
 * for each item.
 * @param {function(value: T): R} [elementSelector] A function that extracts the
 * return element for each item.
 * @param {function(grouped: GroupedObservable<K,R>): Observable<any>} [durationSelector]
 * A function that returns an Observable to determine how long each group should
 * exist.
 * @return {Observable<GroupedObservable<K,R>>} An Observable that emits
 * GroupedObservables, each of which corresponds to a unique key value and each
 * of which emits those items from the source Observable that share that key
 * value.
 * @method groupBy
 * @owner Observable
 */
function groupBy$$1(keySelector, elementSelector, durationSelector, subjectSelector) {
    return groupBy$1(keySelector, elementSelector, durationSelector, subjectSelector)(this);
}

Observable.prototype.groupBy = groupBy$$1;

/**
 * Ignores all items emitted by the source Observable and only passes calls of `complete` or `error`.
 *
 * <img src="./img/ignoreElements.png" width="100%">
 *
 * @return {Observable} An empty Observable that only calls `complete`
 * or `error`, based on which one is called by the source Observable.
 * @method ignoreElements
 * @owner Observable
 */
function ignoreElements$1() {
    return function ignoreElementsOperatorFunction(source) {
        return source.lift(new IgnoreElementsOperator());
    };
}
var IgnoreElementsOperator = (function () {
    function IgnoreElementsOperator() {
    }
    IgnoreElementsOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new IgnoreElementsSubscriber(subscriber));
    };
    return IgnoreElementsOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var IgnoreElementsSubscriber = (function (_super) {
    __extends(IgnoreElementsSubscriber, _super);
    function IgnoreElementsSubscriber() {
        _super.apply(this, arguments);
    }
    IgnoreElementsSubscriber.prototype._next = function (unused) {
        noop();
    };
    return IgnoreElementsSubscriber;
}(Subscriber));

/**
 * Ignores all items emitted by the source Observable and only passes calls of `complete` or `error`.
 *
 * <img src="./img/ignoreElements.png" width="100%">
 *
 * @return {Observable} An empty Observable that only calls `complete`
 * or `error`, based on which one is called by the source Observable.
 * @method ignoreElements
 * @owner Observable
 */
function ignoreElements$$1() {
    return ignoreElements$1()(this);
}

Observable.prototype.ignoreElements = ignoreElements$$1;

function isEmpty$1() {
    return function (source) { return source.lift(new IsEmptyOperator()); };
}
var IsEmptyOperator = (function () {
    function IsEmptyOperator() {
    }
    IsEmptyOperator.prototype.call = function (observer, source) {
        return source.subscribe(new IsEmptySubscriber(observer));
    };
    return IsEmptyOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var IsEmptySubscriber = (function (_super) {
    __extends(IsEmptySubscriber, _super);
    function IsEmptySubscriber(destination) {
        _super.call(this, destination);
    }
    IsEmptySubscriber.prototype.notifyComplete = function (isEmpty) {
        var destination = this.destination;
        destination.next(isEmpty);
        destination.complete();
    };
    IsEmptySubscriber.prototype._next = function (value) {
        this.notifyComplete(false);
    };
    IsEmptySubscriber.prototype._complete = function () {
        this.notifyComplete(true);
    };
    return IsEmptySubscriber;
}(Subscriber));

/**
 * If the source Observable is empty it returns an Observable that emits true, otherwise it emits false.
 *
 * <img src="./img/isEmpty.png" width="100%">
 *
 * @return {Observable} An Observable that emits a Boolean.
 * @method isEmpty
 * @owner Observable
 */
function isEmpty$$1() {
    return isEmpty$1()(this);
}

Observable.prototype.isEmpty = isEmpty$$1;

/**
 * Ignores source values for a duration determined by another Observable, then
 * emits the most recent value from the source Observable, then repeats this
 * process.
 *
 * <span class="informal">It's like {@link auditTime}, but the silencing
 * duration is determined by a second Observable.</span>
 *
 * <img src="./img/audit.png" width="100%">
 *
 * `audit` is similar to `throttle`, but emits the last value from the silenced
 * time window, instead of the first value. `audit` emits the most recent value
 * from the source Observable on the output Observable as soon as its internal
 * timer becomes disabled, and ignores source values while the timer is enabled.
 * Initially, the timer is disabled. As soon as the first source value arrives,
 * the timer is enabled by calling the `durationSelector` function with the
 * source value, which returns the "duration" Observable. When the duration
 * Observable emits a value or completes, the timer is disabled, then the most
 * recent source value is emitted on the output Observable, and this process
 * repeats for the next source value.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.audit(ev => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounce}
 * @see {@link delayWhen}
 * @see {@link sample}
 * @see {@link throttle}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the silencing
 * duration, returned as an Observable or a Promise.
 * @return {Observable<T>} An Observable that performs rate-limiting of
 * emissions from the source Observable.
 * @method audit
 * @owner Observable
 */
function audit$1(durationSelector) {
    return function auditOperatorFunction(source) {
        return source.lift(new AuditOperator(durationSelector));
    };
}
var AuditOperator = (function () {
    function AuditOperator(durationSelector) {
        this.durationSelector = durationSelector;
    }
    AuditOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new AuditSubscriber(subscriber, this.durationSelector));
    };
    return AuditOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var AuditSubscriber = (function (_super) {
    __extends(AuditSubscriber, _super);
    function AuditSubscriber(destination, durationSelector) {
        _super.call(this, destination);
        this.durationSelector = durationSelector;
        this.hasValue = false;
    }
    AuditSubscriber.prototype._next = function (value) {
        this.value = value;
        this.hasValue = true;
        if (!this.throttled) {
            var duration = tryCatch(this.durationSelector)(value);
            if (duration === errorObject) {
                this.destination.error(errorObject.e);
            }
            else {
                var innerSubscription = subscribeToResult(this, duration);
                if (innerSubscription.closed) {
                    this.clearThrottle();
                }
                else {
                    this.add(this.throttled = innerSubscription);
                }
            }
        }
    };
    AuditSubscriber.prototype.clearThrottle = function () {
        var _a = this, value = _a.value, hasValue = _a.hasValue, throttled = _a.throttled;
        if (throttled) {
            this.remove(throttled);
            this.throttled = null;
            throttled.unsubscribe();
        }
        if (hasValue) {
            this.value = null;
            this.hasValue = false;
            this.destination.next(value);
        }
    };
    AuditSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex) {
        this.clearThrottle();
    };
    AuditSubscriber.prototype.notifyComplete = function () {
        this.clearThrottle();
    };
    return AuditSubscriber;
}(OuterSubscriber));

/**
 * Ignores source values for a duration determined by another Observable, then
 * emits the most recent value from the source Observable, then repeats this
 * process.
 *
 * <span class="informal">It's like {@link auditTime}, but the silencing
 * duration is determined by a second Observable.</span>
 *
 * <img src="./img/audit.png" width="100%">
 *
 * `audit` is similar to `throttle`, but emits the last value from the silenced
 * time window, instead of the first value. `audit` emits the most recent value
 * from the source Observable on the output Observable as soon as its internal
 * timer becomes disabled, and ignores source values while the timer is enabled.
 * Initially, the timer is disabled. As soon as the first source value arrives,
 * the timer is enabled by calling the `durationSelector` function with the
 * source value, which returns the "duration" Observable. When the duration
 * Observable emits a value or completes, the timer is disabled, then the most
 * recent source value is emitted on the output Observable, and this process
 * repeats for the next source value.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.audit(ev => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounce}
 * @see {@link delayWhen}
 * @see {@link sample}
 * @see {@link throttle}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the silencing
 * duration, returned as an Observable or a Promise.
 * @return {Observable<T>} An Observable that performs rate-limiting of
 * emissions from the source Observable.
 * @method audit
 * @owner Observable
 */
function audit$$1(durationSelector) {
    return audit$1(durationSelector)(this);
}

Observable.prototype.audit = audit$$1;

/**
 * Ignores source values for `duration` milliseconds, then emits the most recent
 * value from the source Observable, then repeats this process.
 *
 * <span class="informal">When it sees a source values, it ignores that plus
 * the next ones for `duration` milliseconds, and then it emits the most recent
 * value from the source.</span>
 *
 * <img src="./img/auditTime.png" width="100%">
 *
 * `auditTime` is similar to `throttleTime`, but emits the last value from the
 * silenced time window, instead of the first value. `auditTime` emits the most
 * recent value from the source Observable on the output Observable as soon as
 * its internal timer becomes disabled, and ignores source values while the
 * timer is enabled. Initially, the timer is disabled. As soon as the first
 * source value arrives, the timer is enabled. After `duration` milliseconds (or
 * the time unit determined internally by the optional `scheduler`) has passed,
 * the timer is disabled, then the most recent source value is emitted on the
 * output Observable, and this process repeats for the next source value.
 * Optionally takes a {@link IScheduler} for managing timers.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.auditTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounceTime}
 * @see {@link delay}
 * @see {@link sampleTime}
 * @see {@link throttleTime}
 *
 * @param {number} duration Time to wait before emitting the most recent source
 * value, measured in milliseconds or the time unit determined internally
 * by the optional `scheduler`.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the rate-limiting behavior.
 * @return {Observable<T>} An Observable that performs rate-limiting of
 * emissions from the source Observable.
 * @method auditTime
 * @owner Observable
 */
function auditTime$1(duration, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return audit$1(function () { return timer(duration, scheduler); });
}

/**
 * Ignores source values for `duration` milliseconds, then emits the most recent
 * value from the source Observable, then repeats this process.
 *
 * <span class="informal">When it sees a source values, it ignores that plus
 * the next ones for `duration` milliseconds, and then it emits the most recent
 * value from the source.</span>
 *
 * <img src="./img/auditTime.png" width="100%">
 *
 * `auditTime` is similar to `throttleTime`, but emits the last value from the
 * silenced time window, instead of the first value. `auditTime` emits the most
 * recent value from the source Observable on the output Observable as soon as
 * its internal timer becomes disabled, and ignores source values while the
 * timer is enabled. Initially, the timer is disabled. As soon as the first
 * source value arrives, the timer is enabled. After `duration` milliseconds (or
 * the time unit determined internally by the optional `scheduler`) has passed,
 * the timer is disabled, then the most recent source value is emitted on the
 * output Observable, and this process repeats for the next source value.
 * Optionally takes a {@link IScheduler} for managing timers.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.auditTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounceTime}
 * @see {@link delay}
 * @see {@link sampleTime}
 * @see {@link throttleTime}
 *
 * @param {number} duration Time to wait before emitting the most recent source
 * value, measured in milliseconds or the time unit determined internally
 * by the optional `scheduler`.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the rate-limiting behavior.
 * @return {Observable<T>} An Observable that performs rate-limiting of
 * emissions from the source Observable.
 * @method auditTime
 * @owner Observable
 */
function auditTime$$1(duration, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return auditTime$1(duration, scheduler)(this);
}

Observable.prototype.auditTime = auditTime$$1;

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits only the last item emitted by the source Observable.
 * It optionally takes a predicate function as a parameter, in which case, rather than emitting
 * the last item from the source Observable, the resulting Observable will emit the last item
 * from the source Observable that satisfies the predicate.
 *
 * <img src="./img/last.png" width="100%">
 *
 * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
 * callback if the Observable completes before any `next` notification was sent.
 * @param {function} predicate - The condition any source emitted item has to satisfy.
 * @return {Observable} An Observable that emits only the last item satisfying the given condition
 * from the source, or an NoSuchElementException if no such items are emitted.
 * @throws - Throws if no items that match the predicate are emitted by the source Observable.
 * @method last
 * @owner Observable
 */
function last$1(predicate, resultSelector, defaultValue) {
    return function (source) { return source.lift(new LastOperator(predicate, resultSelector, defaultValue, source)); };
}
var LastOperator = (function () {
    function LastOperator(predicate, resultSelector, defaultValue, source) {
        this.predicate = predicate;
        this.resultSelector = resultSelector;
        this.defaultValue = defaultValue;
        this.source = source;
    }
    LastOperator.prototype.call = function (observer, source) {
        return source.subscribe(new LastSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source));
    };
    return LastOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var LastSubscriber = (function (_super) {
    __extends(LastSubscriber, _super);
    function LastSubscriber(destination, predicate, resultSelector, defaultValue, source) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.resultSelector = resultSelector;
        this.defaultValue = defaultValue;
        this.source = source;
        this.hasValue = false;
        this.index = 0;
        if (typeof defaultValue !== 'undefined') {
            this.lastValue = defaultValue;
            this.hasValue = true;
        }
    }
    LastSubscriber.prototype._next = function (value) {
        var index = this.index++;
        if (this.predicate) {
            this._tryPredicate(value, index);
        }
        else {
            if (this.resultSelector) {
                this._tryResultSelector(value, index);
                return;
            }
            this.lastValue = value;
            this.hasValue = true;
        }
    };
    LastSubscriber.prototype._tryPredicate = function (value, index) {
        var result;
        try {
            result = this.predicate(value, index, this.source);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        if (result) {
            if (this.resultSelector) {
                this._tryResultSelector(value, index);
                return;
            }
            this.lastValue = value;
            this.hasValue = true;
        }
    };
    LastSubscriber.prototype._tryResultSelector = function (value, index) {
        var result;
        try {
            result = this.resultSelector(value, index);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.lastValue = result;
        this.hasValue = true;
    };
    LastSubscriber.prototype._complete = function () {
        var destination = this.destination;
        if (this.hasValue) {
            destination.next(this.lastValue);
            destination.complete();
        }
        else {
            destination.error(new EmptyError);
        }
    };
    return LastSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits only the last item emitted by the source Observable.
 * It optionally takes a predicate function as a parameter, in which case, rather than emitting
 * the last item from the source Observable, the resulting Observable will emit the last item
 * from the source Observable that satisfies the predicate.
 *
 * <img src="./img/last.png" width="100%">
 *
 * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
 * callback if the Observable completes before any `next` notification was sent.
 * @param {function} predicate - The condition any source emitted item has to satisfy.
 * @return {Observable} An Observable that emits only the last item satisfying the given condition
 * from the source, or an NoSuchElementException if no such items are emitted.
 * @throws - Throws if no items that match the predicate are emitted by the source Observable.
 * @method last
 * @owner Observable
 */
function last$$1(predicate, resultSelector, defaultValue) {
    return last$1(predicate, resultSelector, defaultValue)(this);
}

Observable.prototype.last = last$$1;

/**
 * @param func
 * @return {Observable<R>}
 * @method let
 * @owner Observable
 */
function letProto(func) {
    return func(this);
}

Observable.prototype.let = letProto;
Observable.prototype.letBind = letProto;

/**
 * Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
 *
 * @example <caption>A simple example emitting true if all elements are less than 5, false otherwise</caption>
 *  Observable.of(1, 2, 3, 4, 5, 6)
 *     .every(x => x < 5)
 *     .subscribe(x => console.log(x)); // -> false
 *
 * @param {function} predicate A function for determining if an item meets a specified condition.
 * @param {any} [thisArg] Optional object to use for `this` in the callback.
 * @return {Observable} An Observable of booleans that determines if all items of the source Observable meet the condition specified.
 * @method every
 * @owner Observable
 */
function every$1(predicate, thisArg) {
    return function (source) { return source.lift(new EveryOperator(predicate, thisArg, source)); };
}
var EveryOperator = (function () {
    function EveryOperator(predicate, thisArg, source) {
        this.predicate = predicate;
        this.thisArg = thisArg;
        this.source = source;
    }
    EveryOperator.prototype.call = function (observer, source) {
        return source.subscribe(new EverySubscriber(observer, this.predicate, this.thisArg, this.source));
    };
    return EveryOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var EverySubscriber = (function (_super) {
    __extends(EverySubscriber, _super);
    function EverySubscriber(destination, predicate, thisArg, source) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.thisArg = thisArg;
        this.source = source;
        this.index = 0;
        this.thisArg = thisArg || this;
    }
    EverySubscriber.prototype.notifyComplete = function (everyValueMatch) {
        this.destination.next(everyValueMatch);
        this.destination.complete();
    };
    EverySubscriber.prototype._next = function (value) {
        var result = false;
        try {
            result = this.predicate.call(this.thisArg, value, this.index++, this.source);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        if (!result) {
            this.notifyComplete(false);
        }
    };
    EverySubscriber.prototype._complete = function () {
        this.notifyComplete(true);
    };
    return EverySubscriber;
}(Subscriber));

/**
 * Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
 *
 * @example <caption>A simple example emitting true if all elements are less than 5, false otherwise</caption>
 *  Observable.of(1, 2, 3, 4, 5, 6)
 *     .every(x => x < 5)
 *     .subscribe(x => console.log(x)); // -> false
 *
 * @param {function} predicate A function for determining if an item meets a specified condition.
 * @param {any} [thisArg] Optional object to use for `this` in the callback.
 * @return {Observable} An Observable of booleans that determines if all items of the source Observable meet the condition specified.
 * @method every
 * @owner Observable
 */
function every$$1(predicate, thisArg) {
    return every$1(predicate, thisArg)(this);
}

Observable.prototype.every = every$$1;

/**
 * Applies a given `project` function to each value emitted by the source
 * Observable, and emits the resulting values as an Observable.
 *
 * <span class="informal">Like [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map),
 * it passes each source value through a transformation function to get
 * corresponding output values.</span>
 *
 * <img src="./img/map.png" width="100%">
 *
 * Similar to the well known `Array.prototype.map` function, this operator
 * applies a projection to each value and emits that projection in the output
 * Observable.
 *
 * @example <caption>Map every click to the clientX position of that click</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var positions = clicks.map(ev => ev.clientX);
 * positions.subscribe(x => console.log(x));
 *
 * @see {@link mapTo}
 * @see {@link pluck}
 *
 * @param {function(value: T, index: number): R} project The function to apply
 * to each `value` emitted by the source Observable. The `index` parameter is
 * the number `i` for the i-th emission that has happened since the
 * subscription, starting from the number `0`.
 * @param {any} [thisArg] An optional argument to define what `this` is in the
 * `project` function.
 * @return {Observable<R>} An Observable that emits the values from the source
 * Observable transformed by the given `project` function.
 * @method map
 * @owner Observable
 */
function map$1(project, thisArg) {
    return map(project, thisArg)(this);
}

Observable.prototype.map = map$1;

/**
 * Emits the given constant value on the output Observable every time the source
 * Observable emits a value.
 *
 * <span class="informal">Like {@link map}, but it maps every source value to
 * the same output value every time.</span>
 *
 * <img src="./img/mapTo.png" width="100%">
 *
 * Takes a constant `value` as argument, and emits that whenever the source
 * Observable emits a value. In other words, ignores the actual source value,
 * and simply uses the emission moment to know when to emit the given `value`.
 *
 * @example <caption>Map every click to the string 'Hi'</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var greetings = clicks.mapTo('Hi');
 * greetings.subscribe(x => console.log(x));
 *
 * @see {@link map}
 *
 * @param {any} value The value to map each source value to.
 * @return {Observable} An Observable that emits the given `value` every time
 * the source Observable emits something.
 * @method mapTo
 * @owner Observable
 */
function mapTo$1(value) {
    return function (source) { return source.lift(new MapToOperator(value)); };
}
var MapToOperator = (function () {
    function MapToOperator(value) {
        this.value = value;
    }
    MapToOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new MapToSubscriber(subscriber, this.value));
    };
    return MapToOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var MapToSubscriber = (function (_super) {
    __extends(MapToSubscriber, _super);
    function MapToSubscriber(destination, value) {
        _super.call(this, destination);
        this.value = value;
    }
    MapToSubscriber.prototype._next = function (x) {
        this.destination.next(this.value);
    };
    return MapToSubscriber;
}(Subscriber));

/**
 * Emits the given constant value on the output Observable every time the source
 * Observable emits a value.
 *
 * <span class="informal">Like {@link map}, but it maps every source value to
 * the same output value every time.</span>
 *
 * <img src="./img/mapTo.png" width="100%">
 *
 * Takes a constant `value` as argument, and emits that whenever the source
 * Observable emits a value. In other words, ignores the actual source value,
 * and simply uses the emission moment to know when to emit the given `value`.
 *
 * @example <caption>Map every click to the string 'Hi'</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var greetings = clicks.mapTo('Hi');
 * greetings.subscribe(x => console.log(x));
 *
 * @see {@link map}
 *
 * @param {any} value The value to map each source value to.
 * @return {Observable} An Observable that emits the given `value` every time
 * the source Observable emits something.
 * @method mapTo
 * @owner Observable
 */
function mapTo$$1(value) {
    return mapTo$1(value)(this);
}

Observable.prototype.mapTo = mapTo$$1;

/**
 * Represents all of the notifications from the source Observable as `next`
 * emissions marked with their original types within {@link Notification}
 * objects.
 *
 * <span class="informal">Wraps `next`, `error` and `complete` emissions in
 * {@link Notification} objects, emitted as `next` on the output Observable.
 * </span>
 *
 * <img src="./img/materialize.png" width="100%">
 *
 * `materialize` returns an Observable that emits a `next` notification for each
 * `next`, `error`, or `complete` emission of the source Observable. When the
 * source Observable emits `complete`, the output Observable will emit `next` as
 * a Notification of type "complete", and then it will emit `complete` as well.
 * When the source Observable emits `error`, the output will emit `next` as a
 * Notification of type "error", and then `complete`.
 *
 * This operator is useful for producing metadata of the source Observable, to
 * be consumed as `next` emissions. Use it in conjunction with
 * {@link dematerialize}.
 *
 * @example <caption>Convert a faulty Observable to an Observable of Notifications</caption>
 * var letters = Rx.Observable.of('a', 'b', 13, 'd');
 * var upperCase = letters.map(x => x.toUpperCase());
 * var materialized = upperCase.materialize();
 * materialized.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // - Notification {kind: "N", value: "A", error: undefined, hasValue: true}
 * // - Notification {kind: "N", value: "B", error: undefined, hasValue: true}
 * // - Notification {kind: "E", value: undefined, error: TypeError:
 * //   x.toUpperCase is not a function at MapSubscriber.letters.map.x
 * //   [as project] (http://1…, hasValue: false}
 *
 * @see {@link Notification}
 * @see {@link dematerialize}
 *
 * @return {Observable<Notification<T>>} An Observable that emits
 * {@link Notification} objects that wrap the original emissions from the source
 * Observable with metadata.
 * @method materialize
 * @owner Observable
 */
function materialize$1() {
    return function materializeOperatorFunction(source) {
        return source.lift(new MaterializeOperator());
    };
}
var MaterializeOperator = (function () {
    function MaterializeOperator() {
    }
    MaterializeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new MaterializeSubscriber(subscriber));
    };
    return MaterializeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var MaterializeSubscriber = (function (_super) {
    __extends(MaterializeSubscriber, _super);
    function MaterializeSubscriber(destination) {
        _super.call(this, destination);
    }
    MaterializeSubscriber.prototype._next = function (value) {
        this.destination.next(Notification.createNext(value));
    };
    MaterializeSubscriber.prototype._error = function (err) {
        var destination = this.destination;
        destination.next(Notification.createError(err));
        destination.complete();
    };
    MaterializeSubscriber.prototype._complete = function () {
        var destination = this.destination;
        destination.next(Notification.createComplete());
        destination.complete();
    };
    return MaterializeSubscriber;
}(Subscriber));

/**
 * Represents all of the notifications from the source Observable as `next`
 * emissions marked with their original types within {@link Notification}
 * objects.
 *
 * <span class="informal">Wraps `next`, `error` and `complete` emissions in
 * {@link Notification} objects, emitted as `next` on the output Observable.
 * </span>
 *
 * <img src="./img/materialize.png" width="100%">
 *
 * `materialize` returns an Observable that emits a `next` notification for each
 * `next`, `error`, or `complete` emission of the source Observable. When the
 * source Observable emits `complete`, the output Observable will emit `next` as
 * a Notification of type "complete", and then it will emit `complete` as well.
 * When the source Observable emits `error`, the output will emit `next` as a
 * Notification of type "error", and then `complete`.
 *
 * This operator is useful for producing metadata of the source Observable, to
 * be consumed as `next` emissions. Use it in conjunction with
 * {@link dematerialize}.
 *
 * @example <caption>Convert a faulty Observable to an Observable of Notifications</caption>
 * var letters = Rx.Observable.of('a', 'b', 13, 'd');
 * var upperCase = letters.map(x => x.toUpperCase());
 * var materialized = upperCase.materialize();
 * materialized.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // - Notification {kind: "N", value: "A", error: undefined, hasValue: true}
 * // - Notification {kind: "N", value: "B", error: undefined, hasValue: true}
 * // - Notification {kind: "E", value: undefined, error: TypeError:
 * //   x.toUpperCase is not a function at MapSubscriber.letters.map.x
 * //   [as project] (http://1…, hasValue: false}
 *
 * @see {@link Notification}
 * @see {@link dematerialize}
 *
 * @return {Observable<Notification<T>>} An Observable that emits
 * {@link Notification} objects that wrap the original emissions from the source
 * Observable with metadata.
 * @method materialize
 * @owner Observable
 */
function materialize$$1() {
    return materialize$1()(this);
}

Observable.prototype.materialize = materialize$$1;

/* tslint:enable:max-line-length */
/**
 * Applies an accumulator function over the source Observable, and returns each
 * intermediate result, with an optional seed value.
 *
 * <span class="informal">It's like {@link reduce}, but emits the current
 * accumulation whenever the source emits a value.</span>
 *
 * <img src="./img/scan.png" width="100%">
 *
 * Combines together all values emitted on the source, using an accumulator
 * function that knows how to join a new source value into the accumulation from
 * the past. Is similar to {@link reduce}, but emits the intermediate
 * accumulations.
 *
 * Returns an Observable that applies a specified `accumulator` function to each
 * item emitted by the source Observable. If a `seed` value is specified, then
 * that value will be used as the initial value for the accumulator. If no seed
 * value is specified, the first item of the source is used as the seed.
 *
 * @example <caption>Count the number of click events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var ones = clicks.mapTo(1);
 * var seed = 0;
 * var count = ones.scan((acc, one) => acc + one, seed);
 * count.subscribe(x => console.log(x));
 *
 * @see {@link expand}
 * @see {@link mergeScan}
 * @see {@link reduce}
 *
 * @param {function(acc: R, value: T, index: number): R} accumulator
 * The accumulator function called on each source value.
 * @param {T|R} [seed] The initial accumulation value.
 * @return {Observable<R>} An observable of the accumulated values.
 * @method scan
 * @owner Observable
 */
function scan(accumulator, seed) {
    var hasSeed = false;
    // providing a seed of `undefined` *should* be valid and trigger
    // hasSeed! so don't use `seed !== undefined` checks!
    // For this reason, we have to check it here at the original call site
    // otherwise inside Operator/Subscriber we won't know if `undefined`
    // means they didn't provide anything or if they literally provided `undefined`
    if (arguments.length >= 2) {
        hasSeed = true;
    }
    return function scanOperatorFunction(source) {
        return source.lift(new ScanOperator(accumulator, seed, hasSeed));
    };
}
var ScanOperator = (function () {
    function ScanOperator(accumulator, seed, hasSeed) {
        if (hasSeed === void 0) { hasSeed = false; }
        this.accumulator = accumulator;
        this.seed = seed;
        this.hasSeed = hasSeed;
    }
    ScanOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));
    };
    return ScanOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ScanSubscriber = (function (_super) {
    __extends(ScanSubscriber, _super);
    function ScanSubscriber(destination, accumulator, _seed, hasSeed) {
        _super.call(this, destination);
        this.accumulator = accumulator;
        this._seed = _seed;
        this.hasSeed = hasSeed;
        this.index = 0;
    }
    Object.defineProperty(ScanSubscriber.prototype, "seed", {
        get: function () {
            return this._seed;
        },
        set: function (value) {
            this.hasSeed = true;
            this._seed = value;
        },
        enumerable: true,
        configurable: true
    });
    ScanSubscriber.prototype._next = function (value) {
        if (!this.hasSeed) {
            this.seed = value;
            this.destination.next(value);
        }
        else {
            return this._tryNext(value);
        }
    };
    ScanSubscriber.prototype._tryNext = function (value) {
        var index = this.index++;
        var result;
        try {
            result = this.accumulator(this.seed, value, index);
        }
        catch (err) {
            this.destination.error(err);
        }
        this.seed = result;
        this.destination.next(result);
    };
    return ScanSubscriber;
}(Subscriber));

/**
 * Emits only the last `count` values emitted by the source Observable.
 *
 * <span class="informal">Remembers the latest `count` values, then emits those
 * only when the source completes.</span>
 *
 * <img src="./img/takeLast.png" width="100%">
 *
 * `takeLast` returns an Observable that emits at most the last `count` values
 * emitted by the source Observable. If the source emits fewer than `count`
 * values then all of its values are emitted. This operator must wait until the
 * `complete` notification emission from the source in order to emit the `next`
 * values on the output Observable, because otherwise it is impossible to know
 * whether or not more values will be emitted on the source. For this reason,
 * all values are emitted synchronously, followed by the complete notification.
 *
 * @example <caption>Take the last 3 values of an Observable with many values</caption>
 * var many = Rx.Observable.range(1, 100);
 * var lastThree = many.takeLast(3);
 * lastThree.subscribe(x => console.log(x));
 *
 * @see {@link take}
 * @see {@link takeUntil}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @throws {ArgumentOutOfRangeError} When using `takeLast(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
 *
 * @param {number} count The maximum number of values to emit from the end of
 * the sequence of values emitted by the source Observable.
 * @return {Observable<T>} An Observable that emits at most the last count
 * values emitted by the source Observable.
 * @method takeLast
 * @owner Observable
 */
function takeLast(count) {
    return function takeLastOperatorFunction(source) {
        if (count === 0) {
            return new EmptyObservable();
        }
        else {
            return source.lift(new TakeLastOperator(count));
        }
    };
}
var TakeLastOperator = (function () {
    function TakeLastOperator(total) {
        this.total = total;
        if (this.total < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    TakeLastOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TakeLastSubscriber(subscriber, this.total));
    };
    return TakeLastOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TakeLastSubscriber = (function (_super) {
    __extends(TakeLastSubscriber, _super);
    function TakeLastSubscriber(destination, total) {
        _super.call(this, destination);
        this.total = total;
        this.ring = new Array();
        this.count = 0;
    }
    TakeLastSubscriber.prototype._next = function (value) {
        var ring = this.ring;
        var total = this.total;
        var count = this.count++;
        if (ring.length < total) {
            ring.push(value);
        }
        else {
            var index = count % total;
            ring[index] = value;
        }
    };
    TakeLastSubscriber.prototype._complete = function () {
        var destination = this.destination;
        var count = this.count;
        if (count > 0) {
            var total = this.count >= this.total ? this.total : this.count;
            var ring = this.ring;
            for (var i = 0; i < total; i++) {
                var idx = (count++) % total;
                destination.next(ring[idx]);
            }
        }
        destination.complete();
    };
    return TakeLastSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Applies an accumulator function over the source Observable, and returns the
 * accumulated result when the source completes, given an optional seed value.
 *
 * <span class="informal">Combines together all values emitted on the source,
 * using an accumulator function that knows how to join a new source value into
 * the accumulation from the past.</span>
 *
 * <img src="./img/reduce.png" width="100%">
 *
 * Like
 * [Array.prototype.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce),
 * `reduce` applies an `accumulator` function against an accumulation and each
 * value of the source Observable (from the past) to reduce it to a single
 * value, emitted on the output Observable. Note that `reduce` will only emit
 * one value, only when the source Observable completes. It is equivalent to
 * applying operator {@link scan} followed by operator {@link last}.
 *
 * Returns an Observable that applies a specified `accumulator` function to each
 * item emitted by the source Observable. If a `seed` value is specified, then
 * that value will be used as the initial value for the accumulator. If no seed
 * value is specified, the first item of the source is used as the seed.
 *
 * @example <caption>Count the number of click events that happened in 5 seconds</caption>
 * var clicksInFiveSeconds = Rx.Observable.fromEvent(document, 'click')
 *   .takeUntil(Rx.Observable.interval(5000));
 * var ones = clicksInFiveSeconds.mapTo(1);
 * var seed = 0;
 * var count = ones.reduce((acc, one) => acc + one, seed);
 * count.subscribe(x => console.log(x));
 *
 * @see {@link count}
 * @see {@link expand}
 * @see {@link mergeScan}
 * @see {@link scan}
 *
 * @param {function(acc: R, value: T, index: number): R} accumulator The accumulator function
 * called on each source value.
 * @param {R} [seed] The initial accumulation value.
 * @return {Observable<R>} An Observable that emits a single value that is the
 * result of accumulating the values emitted by the source Observable.
 * @method reduce
 * @owner Observable
 */
function reduce(accumulator, seed) {
    // providing a seed of `undefined` *should* be valid and trigger
    // hasSeed! so don't use `seed !== undefined` checks!
    // For this reason, we have to check it here at the original call site
    // otherwise inside Operator/Subscriber we won't know if `undefined`
    // means they didn't provide anything or if they literally provided `undefined`
    if (arguments.length >= 2) {
        return function reduceOperatorFunctionWithSeed(source) {
            return pipe(scan(accumulator, seed), takeLast(1), defaultIfEmpty$1(seed))(source);
        };
    }
    return function reduceOperatorFunction(source) {
        return pipe(scan(function (acc, value, index) {
            return accumulator(acc, value, index + 1);
        }), takeLast(1))(source);
    };
}

/**
 * The Max operator operates on an Observable that emits numbers (or items that can be compared with a provided function),
 * and when source Observable completes it emits a single item: the item with the largest value.
 *
 * <img src="./img/max.png" width="100%">
 *
 * @example <caption>Get the maximal value of a series of numbers</caption>
 * Rx.Observable.of(5, 4, 7, 2, 8)
 *   .max()
 *   .subscribe(x => console.log(x)); // -> 8
 *
 * @example <caption>Use a comparer function to get the maximal item</caption>
 * interface Person {
 *   age: number,
 *   name: string
 * }
 * Observable.of<Person>({age: 7, name: 'Foo'},
 *                       {age: 5, name: 'Bar'},
 *                       {age: 9, name: 'Beer'})
 *           .max<Person>((a: Person, b: Person) => a.age < b.age ? -1 : 1)
 *           .subscribe((x: Person) => console.log(x.name)); // -> 'Beer'
 * }
 *
 * @see {@link min}
 *
 * @param {Function} [comparer] - Optional comparer function that it will use instead of its default to compare the
 * value of two items.
 * @return {Observable} An Observable that emits item with the largest value.
 * @method max
 * @owner Observable
 */
function max$1(comparer) {
    var max = (typeof comparer === 'function')
        ? function (x, y) { return comparer(x, y) > 0 ? x : y; }
        : function (x, y) { return x > y ? x : y; };
    return reduce(max);
}

/**
 * The Max operator operates on an Observable that emits numbers (or items that can be compared with a provided function),
 * and when source Observable completes it emits a single item: the item with the largest value.
 *
 * <img src="./img/max.png" width="100%">
 *
 * @example <caption>Get the maximal value of a series of numbers</caption>
 * Rx.Observable.of(5, 4, 7, 2, 8)
 *   .max()
 *   .subscribe(x => console.log(x)); // -> 8
 *
 * @example <caption>Use a comparer function to get the maximal item</caption>
 * interface Person {
 *   age: number,
 *   name: string
 * }
 * Observable.of<Person>({age: 7, name: 'Foo'},
 *                       {age: 5, name: 'Bar'},
 *                       {age: 9, name: 'Beer'})
 *           .max<Person>((a: Person, b: Person) => a.age < b.age ? -1 : 1)
 *           .subscribe((x: Person) => console.log(x.name)); // -> 'Beer'
 * }
 *
 * @see {@link min}
 *
 * @param {Function} [comparer] - Optional comparer function that it will use instead of its default to compare the
 * value of two items.
 * @return {Observable} An Observable that emits item with the largest value.
 * @method max
 * @owner Observable
 */
function max$$1(comparer) {
    return max$1(comparer)(this);
}

Observable.prototype.max = max$$1;

/* tslint:enable:max-line-length */
/**
 * Creates an output Observable which concurrently emits all values from every
 * given input Observable.
 *
 * <span class="informal">Flattens multiple Observables together by blending
 * their values into one Observable.</span>
 *
 * <img src="./img/merge.png" width="100%">
 *
 * `merge` subscribes to each given input Observable (either the source or an
 * Observable given as argument), and simply forwards (without doing any
 * transformation) all the values from all the input Observables to the output
 * Observable. The output Observable only completes once all input Observables
 * have completed. Any error delivered by an input Observable will be immediately
 * emitted on the output Observable.
 *
 * @example <caption>Merge together two Observables: 1s interval and clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var timer = Rx.Observable.interval(1000);
 * var clicksOrTimer = clicks.merge(timer);
 * clicksOrTimer.subscribe(x => console.log(x));
 *
 * @example <caption>Merge together 3 Observables, but only 2 run concurrently</caption>
 * var timer1 = Rx.Observable.interval(1000).take(10);
 * var timer2 = Rx.Observable.interval(2000).take(6);
 * var timer3 = Rx.Observable.interval(500).take(10);
 * var concurrent = 2; // the argument
 * var merged = timer1.merge(timer2, timer3, concurrent);
 * merged.subscribe(x => console.log(x));
 *
 * @see {@link mergeAll}
 * @see {@link mergeMap}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 *
 * @param {ObservableInput} other An input Observable to merge with the source
 * Observable. More than one input Observables may be given as argument.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @param {Scheduler} [scheduler=null] The IScheduler to use for managing
 * concurrency of input Observables.
 * @return {Observable} An Observable that emits items that are the result of
 * every input Observable.
 * @method merge
 * @owner Observable
 */
function merge$2() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return function (source) { return source.lift.call(merge.apply(void 0, [source].concat(observables))); };
}

/* tslint:enable:max-line-length */
/**
 * Creates an output Observable which concurrently emits all values from every
 * given input Observable.
 *
 * <span class="informal">Flattens multiple Observables together by blending
 * their values into one Observable.</span>
 *
 * <img src="./img/merge.png" width="100%">
 *
 * `merge` subscribes to each given input Observable (either the source or an
 * Observable given as argument), and simply forwards (without doing any
 * transformation) all the values from all the input Observables to the output
 * Observable. The output Observable only completes once all input Observables
 * have completed. Any error delivered by an input Observable will be immediately
 * emitted on the output Observable.
 *
 * @example <caption>Merge together two Observables: 1s interval and clicks</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var timer = Rx.Observable.interval(1000);
 * var clicksOrTimer = clicks.merge(timer);
 * clicksOrTimer.subscribe(x => console.log(x));
 *
 * @example <caption>Merge together 3 Observables, but only 2 run concurrently</caption>
 * var timer1 = Rx.Observable.interval(1000).take(10);
 * var timer2 = Rx.Observable.interval(2000).take(6);
 * var timer3 = Rx.Observable.interval(500).take(10);
 * var concurrent = 2; // the argument
 * var merged = timer1.merge(timer2, timer3, concurrent);
 * merged.subscribe(x => console.log(x));
 *
 * @see {@link mergeAll}
 * @see {@link mergeMap}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 *
 * @param {ObservableInput} other An input Observable to merge with the source
 * Observable. More than one input Observables may be given as argument.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @param {Scheduler} [scheduler=null] The IScheduler to use for managing
 * concurrency of input Observables.
 * @return {Observable} An Observable that emits items that are the result of
 * every input Observable.
 * @method merge
 * @owner Observable
 */
function merge$1() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return merge$2.apply(void 0, observables)(this);
}

Observable.prototype.merge = merge$1;

/**
 * Converts a higher-order Observable into a first-order Observable which
 * concurrently delivers all values that are emitted on the inner Observables.
 *
 * <span class="informal">Flattens an Observable-of-Observables.</span>
 *
 * <img src="./img/mergeAll.png" width="100%">
 *
 * `mergeAll` subscribes to an Observable that emits Observables, also known as
 * a higher-order Observable. Each time it observes one of these emitted inner
 * Observables, it subscribes to that and delivers all the values from the
 * inner Observable on the output Observable. The output Observable only
 * completes once all inner Observables have completed. Any error delivered by
 * a inner Observable will be immediately emitted on the output Observable.
 *
 * @example <caption>Spawn a new interval Observable for each click event, and blend their outputs as one Observable</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
 * var firstOrder = higherOrder.mergeAll();
 * firstOrder.subscribe(x => console.log(x));
 *
 * @example <caption>Count from 0 to 9 every second for each click, but only allow 2 concurrent timers</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(10));
 * var firstOrder = higherOrder.mergeAll(2);
 * firstOrder.subscribe(x => console.log(x));
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link exhaust}
 * @see {@link merge}
 * @see {@link mergeMap}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 * @see {@link switch}
 * @see {@link zipAll}
 *
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of inner
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits values coming from all the
 * inner Observables emitted by the source Observable.
 * @method mergeAll
 * @owner Observable
 */
function mergeAll$1(concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return mergeAll(concurrent)(this);
}

Observable.prototype.mergeAll = mergeAll$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link mergeAll}.</span>
 *
 * <img src="./img/mergeMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an Observable, and then merging those resulting Observables and
 * emitting the results of this merger.
 *
 * @example <caption>Map and flatten each letter to an Observable ticking every 1 second</caption>
 * var letters = Rx.Observable.of('a', 'b', 'c');
 * var result = letters.mergeMap(x =>
 *   Rx.Observable.interval(1000).map(i => x+i)
 * );
 * result.subscribe(x => console.log(x));
 *
 * // Results in the following:
 * // a0
 * // b0
 * // c0
 * // a1
 * // b1
 * // c1
 * // continues to list a,b,c with respective ascending integers
 *
 * @see {@link concatMap}
 * @see {@link exhaustMap}
 * @see {@link merge}
 * @see {@link mergeAll}
 * @see {@link mergeMapTo}
 * @see {@link mergeScan}
 * @see {@link switchMap}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and merging the results of the Observables obtained
 * from this transformation.
 * @method mergeMap
 * @owner Observable
 */
function mergeMap$1(project, resultSelector, concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return mergeMap(project, resultSelector, concurrent)(this);
}

Observable.prototype.mergeMap = mergeMap$1;
Observable.prototype.flatMap = mergeMap$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to the same Observable which is merged multiple
 * times in the output Observable.
 *
 * <span class="informal">It's like {@link mergeMap}, but maps each value always
 * to the same inner Observable.</span>
 *
 * <img src="./img/mergeMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then merges those resulting Observables into one
 * single Observable, which is the output Observable.
 *
 * @example <caption>For each click event, start an interval Observable ticking every 1 second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.mergeMapTo(Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMapTo}
 * @see {@link merge}
 * @see {@link mergeAll}
 * @see {@link mergeMap}
 * @see {@link mergeScan}
 * @see {@link switchMapTo}
 *
 * @param {ObservableInput} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits items from the given
 * `innerObservable` (and optionally transformed through `resultSelector`) every
 * time a value is emitted on the source Observable.
 * @method mergeMapTo
 * @owner Observable
 */
function mergeMapTo$1(innerObservable, resultSelector, concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    if (typeof resultSelector === 'number') {
        concurrent = resultSelector;
        resultSelector = null;
    }
    return function (source) { return source.lift(new MergeMapToOperator(innerObservable, resultSelector, concurrent)); };
}
// TODO: Figure out correct signature here: an Operator<Observable<T>, R>
//       needs to implement call(observer: Subscriber<R>): Subscriber<Observable<T>>
var MergeMapToOperator = (function () {
    function MergeMapToOperator(ish, resultSelector, concurrent) {
        if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
        this.ish = ish;
        this.resultSelector = resultSelector;
        this.concurrent = concurrent;
    }
    MergeMapToOperator.prototype.call = function (observer, source) {
        return source.subscribe(new MergeMapToSubscriber(observer, this.ish, this.resultSelector, this.concurrent));
    };
    return MergeMapToOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var MergeMapToSubscriber = (function (_super) {
    __extends(MergeMapToSubscriber, _super);
    function MergeMapToSubscriber(destination, ish, resultSelector, concurrent) {
        if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
        _super.call(this, destination);
        this.ish = ish;
        this.resultSelector = resultSelector;
        this.concurrent = concurrent;
        this.hasCompleted = false;
        this.buffer = [];
        this.active = 0;
        this.index = 0;
    }
    MergeMapToSubscriber.prototype._next = function (value) {
        if (this.active < this.concurrent) {
            var resultSelector = this.resultSelector;
            var index = this.index++;
            var ish = this.ish;
            var destination = this.destination;
            this.active++;
            this._innerSub(ish, destination, resultSelector, value, index);
        }
        else {
            this.buffer.push(value);
        }
    };
    MergeMapToSubscriber.prototype._innerSub = function (ish, destination, resultSelector, value, index) {
        this.add(subscribeToResult(this, ish, value, index));
    };
    MergeMapToSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (this.active === 0 && this.buffer.length === 0) {
            this.destination.complete();
        }
    };
    MergeMapToSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        if (resultSelector) {
            this.trySelectResult(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            destination.next(innerValue);
        }
    };
    MergeMapToSubscriber.prototype.trySelectResult = function (outerValue, innerValue, outerIndex, innerIndex) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        var result;
        try {
            result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        catch (err) {
            destination.error(err);
            return;
        }
        destination.next(result);
    };
    MergeMapToSubscriber.prototype.notifyError = function (err) {
        this.destination.error(err);
    };
    MergeMapToSubscriber.prototype.notifyComplete = function (innerSub) {
        var buffer = this.buffer;
        this.remove(innerSub);
        this.active--;
        if (buffer.length > 0) {
            this._next(buffer.shift());
        }
        else if (this.active === 0 && this.hasCompleted) {
            this.destination.complete();
        }
    };
    return MergeMapToSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 * Projects each source value to the same Observable which is merged multiple
 * times in the output Observable.
 *
 * <span class="informal">It's like {@link mergeMap}, but maps each value always
 * to the same inner Observable.</span>
 *
 * <img src="./img/mergeMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then merges those resulting Observables into one
 * single Observable, which is the output Observable.
 *
 * @example <caption>For each click event, start an interval Observable ticking every 1 second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.mergeMapTo(Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMapTo}
 * @see {@link merge}
 * @see {@link mergeAll}
 * @see {@link mergeMap}
 * @see {@link mergeScan}
 * @see {@link switchMapTo}
 *
 * @param {ObservableInput} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits items from the given
 * `innerObservable` (and optionally transformed through `resultSelector`) every
 * time a value is emitted on the source Observable.
 * @method mergeMapTo
 * @owner Observable
 */
function mergeMapTo$$1(innerObservable, resultSelector, concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return mergeMapTo$1(innerObservable, resultSelector, concurrent)(this);
}

Observable.prototype.flatMapTo = mergeMapTo$$1;
Observable.prototype.mergeMapTo = mergeMapTo$$1;

/**
 * Applies an accumulator function over the source Observable where the
 * accumulator function itself returns an Observable, then each intermediate
 * Observable returned is merged into the output Observable.
 *
 * <span class="informal">It's like {@link scan}, but the Observables returned
 * by the accumulator are merged into the outer Observable.</span>
 *
 * @example <caption>Count the number of click events</caption>
 * const click$ = Rx.Observable.fromEvent(document, 'click');
 * const one$ = click$.mapTo(1);
 * const seed = 0;
 * const count$ = one$.mergeScan((acc, one) => Rx.Observable.of(acc + one), seed);
 * count$.subscribe(x => console.log(x));
 *
 * // Results:
 * 1
 * 2
 * 3
 * 4
 * // ...and so on for each click
 *
 * @param {function(acc: R, value: T): Observable<R>} accumulator
 * The accumulator function called on each source value.
 * @param seed The initial accumulation value.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of
 * input Observables being subscribed to concurrently.
 * @return {Observable<R>} An observable of the accumulated values.
 * @method mergeScan
 * @owner Observable
 */
function mergeScan$1(accumulator, seed, concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return function (source) { return source.lift(new MergeScanOperator(accumulator, seed, concurrent)); };
}
var MergeScanOperator = (function () {
    function MergeScanOperator(accumulator, seed, concurrent) {
        this.accumulator = accumulator;
        this.seed = seed;
        this.concurrent = concurrent;
    }
    MergeScanOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent));
    };
    return MergeScanOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var MergeScanSubscriber = (function (_super) {
    __extends(MergeScanSubscriber, _super);
    function MergeScanSubscriber(destination, accumulator, acc, concurrent) {
        _super.call(this, destination);
        this.accumulator = accumulator;
        this.acc = acc;
        this.concurrent = concurrent;
        this.hasValue = false;
        this.hasCompleted = false;
        this.buffer = [];
        this.active = 0;
        this.index = 0;
    }
    MergeScanSubscriber.prototype._next = function (value) {
        if (this.active < this.concurrent) {
            var index = this.index++;
            var ish = tryCatch(this.accumulator)(this.acc, value);
            var destination = this.destination;
            if (ish === errorObject) {
                destination.error(errorObject.e);
            }
            else {
                this.active++;
                this._innerSub(ish, value, index);
            }
        }
        else {
            this.buffer.push(value);
        }
    };
    MergeScanSubscriber.prototype._innerSub = function (ish, value, index) {
        this.add(subscribeToResult(this, ish, value, index));
    };
    MergeScanSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (this.active === 0 && this.buffer.length === 0) {
            if (this.hasValue === false) {
                this.destination.next(this.acc);
            }
            this.destination.complete();
        }
    };
    MergeScanSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var destination = this.destination;
        this.acc = innerValue;
        this.hasValue = true;
        destination.next(innerValue);
    };
    MergeScanSubscriber.prototype.notifyComplete = function (innerSub) {
        var buffer = this.buffer;
        this.remove(innerSub);
        this.active--;
        if (buffer.length > 0) {
            this._next(buffer.shift());
        }
        else if (this.active === 0 && this.hasCompleted) {
            if (this.hasValue === false) {
                this.destination.next(this.acc);
            }
            this.destination.complete();
        }
    };
    return MergeScanSubscriber;
}(OuterSubscriber));

/**
 * Applies an accumulator function over the source Observable where the
 * accumulator function itself returns an Observable, then each intermediate
 * Observable returned is merged into the output Observable.
 *
 * <span class="informal">It's like {@link scan}, but the Observables returned
 * by the accumulator are merged into the outer Observable.</span>
 *
 * @example <caption>Count the number of click events</caption>
 * const click$ = Rx.Observable.fromEvent(document, 'click');
 * const one$ = click$.mapTo(1);
 * const seed = 0;
 * const count$ = one$.mergeScan((acc, one) => Rx.Observable.of(acc + one), seed);
 * count$.subscribe(x => console.log(x));
 *
 * // Results:
 * 1
 * 2
 * 3
 * 4
 * // ...and so on for each click
 *
 * @param {function(acc: R, value: T): Observable<R>} accumulator
 * The accumulator function called on each source value.
 * @param seed The initial accumulation value.
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of
 * input Observables being subscribed to concurrently.
 * @return {Observable<R>} An observable of the accumulated values.
 * @method mergeScan
 * @owner Observable
 */
function mergeScan$$1(accumulator, seed, concurrent) {
    if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
    return mergeScan$1(accumulator, seed, concurrent)(this);
}

Observable.prototype.mergeScan = mergeScan$$1;

/**
 * The Min operator operates on an Observable that emits numbers (or items that can be compared with a provided function),
 * and when source Observable completes it emits a single item: the item with the smallest value.
 *
 * <img src="./img/min.png" width="100%">
 *
 * @example <caption>Get the minimal value of a series of numbers</caption>
 * Rx.Observable.of(5, 4, 7, 2, 8)
 *   .min()
 *   .subscribe(x => console.log(x)); // -> 2
 *
 * @example <caption>Use a comparer function to get the minimal item</caption>
 * interface Person {
 *   age: number,
 *   name: string
 * }
 * Observable.of<Person>({age: 7, name: 'Foo'},
 *                       {age: 5, name: 'Bar'},
 *                       {age: 9, name: 'Beer'})
 *           .min<Person>( (a: Person, b: Person) => a.age < b.age ? -1 : 1)
 *           .subscribe((x: Person) => console.log(x.name)); // -> 'Bar'
 * }
 *
 * @see {@link max}
 *
 * @param {Function} [comparer] - Optional comparer function that it will use instead of its default to compare the
 * value of two items.
 * @return {Observable<R>} An Observable that emits item with the smallest value.
 * @method min
 * @owner Observable
 */
function min$1(comparer) {
    var min = (typeof comparer === 'function')
        ? function (x, y) { return comparer(x, y) < 0 ? x : y; }
        : function (x, y) { return x < y ? x : y; };
    return reduce(min);
}

/**
 * The Min operator operates on an Observable that emits numbers (or items that can be compared with a provided function),
 * and when source Observable completes it emits a single item: the item with the smallest value.
 *
 * <img src="./img/min.png" width="100%">
 *
 * @example <caption>Get the minimal value of a series of numbers</caption>
 * Rx.Observable.of(5, 4, 7, 2, 8)
 *   .min()
 *   .subscribe(x => console.log(x)); // -> 2
 *
 * @example <caption>Use a comparer function to get the minimal item</caption>
 * interface Person {
 *   age: number,
 *   name: string
 * }
 * Observable.of<Person>({age: 7, name: 'Foo'},
 *                       {age: 5, name: 'Bar'},
 *                       {age: 9, name: 'Beer'})
 *           .min<Person>( (a: Person, b: Person) => a.age < b.age ? -1 : 1)
 *           .subscribe((x: Person) => console.log(x.name)); // -> 'Bar'
 * }
 *
 * @see {@link max}
 *
 * @param {Function} [comparer] - Optional comparer function that it will use instead of its default to compare the
 * value of two items.
 * @return {Observable<R>} An Observable that emits item with the smallest value.
 * @method min
 * @owner Observable
 */
function min$$1(comparer) {
    return min$1(comparer)(this);
}

Observable.prototype.min = min$$1;

function refCount() {
    return function refCountOperatorFunction(source) {
        return source.lift(new RefCountOperator$1(source));
    };
}
var RefCountOperator$1 = (function () {
    function RefCountOperator(connectable) {
        this.connectable = connectable;
    }
    RefCountOperator.prototype.call = function (subscriber, source) {
        var connectable = this.connectable;
        connectable._refCount++;
        var refCounter = new RefCountSubscriber$1(subscriber, connectable);
        var subscription = source.subscribe(refCounter);
        if (!refCounter.closed) {
            refCounter.connection = connectable.connect();
        }
        return subscription;
    };
    return RefCountOperator;
}());
var RefCountSubscriber$1 = (function (_super) {
    __extends(RefCountSubscriber, _super);
    function RefCountSubscriber(destination, connectable) {
        _super.call(this, destination);
        this.connectable = connectable;
    }
    /** @deprecated internal use only */ RefCountSubscriber.prototype._unsubscribe = function () {
        var connectable = this.connectable;
        if (!connectable) {
            this.connection = null;
            return;
        }
        this.connectable = null;
        var refCount = connectable._refCount;
        if (refCount <= 0) {
            this.connection = null;
            return;
        }
        connectable._refCount = refCount - 1;
        if (refCount > 1) {
            this.connection = null;
            return;
        }
        ///
        // Compare the local RefCountSubscriber's connection Subscription to the
        // connection Subscription on the shared ConnectableObservable. In cases
        // where the ConnectableObservable source synchronously emits values, and
        // the RefCountSubscriber's downstream Observers synchronously unsubscribe,
        // execution continues to here before the RefCountOperator has a chance to
        // supply the RefCountSubscriber with the shared connection Subscription.
        // For example:
        // ```
        // Observable.range(0, 10)
        //   .publish()
        //   .refCount()
        //   .take(5)
        //   .subscribe();
        // ```
        // In order to account for this case, RefCountSubscriber should only dispose
        // the ConnectableObservable's shared connection Subscription if the
        // connection Subscription exists, *and* either:
        //   a. RefCountSubscriber doesn't have a reference to the shared connection
        //      Subscription yet, or,
        //   b. RefCountSubscriber's connection Subscription reference is identical
        //      to the shared connection Subscription
        ///
        var connection = this.connection;
        var sharedConnection = connectable._connection;
        this.connection = null;
        if (sharedConnection && (!connection || sharedConnection === connection)) {
            sharedConnection.unsubscribe();
        }
    };
    return RefCountSubscriber;
}(Subscriber));

/**
 * @class ConnectableObservable<T>
 */
var ConnectableObservable = (function (_super) {
    __extends(ConnectableObservable, _super);
    function ConnectableObservable(/** @deprecated internal use only */ source, 
        /** @deprecated internal use only */ subjectFactory) {
        _super.call(this);
        this.source = source;
        this.subjectFactory = subjectFactory;
        /** @deprecated internal use only */ this._refCount = 0;
        this._isComplete = false;
    }
    /** @deprecated internal use only */ ConnectableObservable.prototype._subscribe = function (subscriber) {
        return this.getSubject().subscribe(subscriber);
    };
    /** @deprecated internal use only */ ConnectableObservable.prototype.getSubject = function () {
        var subject = this._subject;
        if (!subject || subject.isStopped) {
            this._subject = this.subjectFactory();
        }
        return this._subject;
    };
    ConnectableObservable.prototype.connect = function () {
        var connection = this._connection;
        if (!connection) {
            this._isComplete = false;
            connection = this._connection = new Subscription();
            connection.add(this.source
                .subscribe(new ConnectableSubscriber(this.getSubject(), this)));
            if (connection.closed) {
                this._connection = null;
                connection = Subscription.EMPTY;
            }
            else {
                this._connection = connection;
            }
        }
        return connection;
    };
    ConnectableObservable.prototype.refCount = function () {
        return refCount()(this);
    };
    return ConnectableObservable;
}(Observable));
var connectableProto = ConnectableObservable.prototype;
var connectableObservableDescriptor = {
    operator: { value: null },
    _refCount: { value: 0, writable: true },
    _subject: { value: null, writable: true },
    _connection: { value: null, writable: true },
    _subscribe: { value: connectableProto._subscribe },
    _isComplete: { value: connectableProto._isComplete, writable: true },
    getSubject: { value: connectableProto.getSubject },
    connect: { value: connectableProto.connect },
    refCount: { value: connectableProto.refCount }
};
var ConnectableSubscriber = (function (_super) {
    __extends(ConnectableSubscriber, _super);
    function ConnectableSubscriber(destination, connectable) {
        _super.call(this, destination);
        this.connectable = connectable;
    }
    ConnectableSubscriber.prototype._error = function (err) {
        this._unsubscribe();
        _super.prototype._error.call(this, err);
    };
    ConnectableSubscriber.prototype._complete = function () {
        this.connectable._isComplete = true;
        this._unsubscribe();
        _super.prototype._complete.call(this);
    };
    /** @deprecated internal use only */ ConnectableSubscriber.prototype._unsubscribe = function () {
        var connectable = this.connectable;
        if (connectable) {
            this.connectable = null;
            var connection = connectable._connection;
            connectable._refCount = 0;
            connectable._subject = null;
            connectable._connection = null;
            if (connection) {
                connection.unsubscribe();
            }
        }
    };
    return ConnectableSubscriber;
}(SubjectSubscriber));
var RefCountSubscriber = (function (_super) {
    __extends(RefCountSubscriber, _super);
    function RefCountSubscriber(destination, connectable) {
        _super.call(this, destination);
        this.connectable = connectable;
    }
    /** @deprecated internal use only */ RefCountSubscriber.prototype._unsubscribe = function () {
        var connectable = this.connectable;
        if (!connectable) {
            this.connection = null;
            return;
        }
        this.connectable = null;
        var refCount$$1 = connectable._refCount;
        if (refCount$$1 <= 0) {
            this.connection = null;
            return;
        }
        connectable._refCount = refCount$$1 - 1;
        if (refCount$$1 > 1) {
            this.connection = null;
            return;
        }
        ///
        // Compare the local RefCountSubscriber's connection Subscription to the
        // connection Subscription on the shared ConnectableObservable. In cases
        // where the ConnectableObservable source synchronously emits values, and
        // the RefCountSubscriber's downstream Observers synchronously unsubscribe,
        // execution continues to here before the RefCountOperator has a chance to
        // supply the RefCountSubscriber with the shared connection Subscription.
        // For example:
        // ```
        // Observable.range(0, 10)
        //   .publish()
        //   .refCount()
        //   .take(5)
        //   .subscribe();
        // ```
        // In order to account for this case, RefCountSubscriber should only dispose
        // the ConnectableObservable's shared connection Subscription if the
        // connection Subscription exists, *and* either:
        //   a. RefCountSubscriber doesn't have a reference to the shared connection
        //      Subscription yet, or,
        //   b. RefCountSubscriber's connection Subscription reference is identical
        //      to the shared connection Subscription
        ///
        var connection = this.connection;
        var sharedConnection = connectable._connection;
        this.connection = null;
        if (sharedConnection && (!connection || sharedConnection === connection)) {
            sharedConnection.unsubscribe();
        }
    };
    return RefCountSubscriber;
}(Subscriber));

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits the results of invoking a specified selector on items
 * emitted by a ConnectableObservable that shares a single subscription to the underlying stream.
 *
 * <img src="./img/multicast.png" width="100%">
 *
 * @param {Function|Subject} subjectOrSubjectFactory - Factory function to create an intermediate subject through
 * which the source sequence's elements will be multicast to the selector function
 * or Subject to push source elements into.
 * @param {Function} [selector] - Optional selector function that can use the multicasted source stream
 * as many times as needed, without causing multiple subscriptions to the source stream.
 * Subscribers to the given source will receive all notifications of the source from the
 * time of the subscription forward.
 * @return {Observable} An Observable that emits the results of invoking the selector
 * on the items emitted by a `ConnectableObservable` that shares a single subscription to
 * the underlying stream.
 * @method multicast
 * @owner Observable
 */
function multicast$1(subjectOrSubjectFactory, selector) {
    return function multicastOperatorFunction(source) {
        var subjectFactory;
        if (typeof subjectOrSubjectFactory === 'function') {
            subjectFactory = subjectOrSubjectFactory;
        }
        else {
            subjectFactory = function subjectFactory() {
                return subjectOrSubjectFactory;
            };
        }
        if (typeof selector === 'function') {
            return source.lift(new MulticastOperator(subjectFactory, selector));
        }
        var connectable = Object.create(source, connectableObservableDescriptor);
        connectable.source = source;
        connectable.subjectFactory = subjectFactory;
        return connectable;
    };
}
var MulticastOperator = (function () {
    function MulticastOperator(subjectFactory, selector) {
        this.subjectFactory = subjectFactory;
        this.selector = selector;
    }
    MulticastOperator.prototype.call = function (subscriber, source) {
        var selector = this.selector;
        var subject = this.subjectFactory();
        var subscription = selector(subject).subscribe(subscriber);
        subscription.add(source.subscribe(subject));
        return subscription;
    };
    return MulticastOperator;
}());

/* tslint:enable:max-line-length */
/**
 * Allows source Observable to be subscribed only once with a Subject of choice,
 * while still sharing its values between multiple subscribers.
 *
 * <span class="informal">Subscribe to Observable once, but send its values to multiple subscribers.</span>
 *
 * <img src="./img/multicast.png" width="100%">
 *
 * `multicast` is an operator that works in two modes.
 *
 * In the first mode you provide a single argument to it, which can be either an initialized Subject or a Subject
 * factory. As a result you will get a special kind of an Observable - a {@link ConnectableObservable}. It can be
 * subscribed multiple times, just as regular Observable, but it won't subscribe to the source Observable at that
 * moment. It will do it only if you call its `connect` method. This means you can essentially control by hand, when
 * source Observable will be actually subscribed. What is more, ConnectableObservable will share this one subscription
 * between all of its subscribers. This means that, for example, `ajax` Observable will only send a request once,
 * even though usually it would send a request per every subscriber. Since it sends a request at the moment of
 * subscription, here request would be sent when the `connect` method of a ConnectableObservable is called.
 *
 * The most common pattern of using ConnectableObservable is calling `connect` when the first consumer subscribes,
 * keeping the subscription alive while several consumers come and go and finally unsubscribing from the source
 * Observable, when the last consumer unsubscribes. To not implement that logic over and over again,
 * ConnectableObservable has a special operator, `refCount`. When called, it returns an Observable, which will count
 * the number of consumers subscribed to it and keep ConnectableObservable connected as long as there is at least
 * one consumer. So if you don't actually need to decide yourself when to connect and disconnect a
 * ConnectableObservable, use `refCount`.
 *
 * The second mode is invoked by calling `multicast` with an additional, second argument - selector function.
 * This function accepts an Observable - which basically mirrors the source Observable - and returns Observable
 * as well, which should be the input stream modified by any operators you want. Note that in this
 * mode you cannot provide initialized Subject as a first argument - it has to be a Subject factory. If
 * you provide selector function, `multicast` returns just a regular Observable, instead of ConnectableObservable.
 * Thus, as usual, each subscription to this stream triggers subscription to the source Observable. However,
 * if inside the selector function you subscribe to the input Observable multiple times, actual source stream
 * will be subscribed only once. So if you have a chain of operators that use some Observable many times,
 * but you want to subscribe to that Observable only once, this is the mode you would use.
 *
 * Subject provided as a first parameter of `multicast` is used as a proxy for the single subscription to the
 * source Observable. It means that all values from the source stream go through that Subject. Thus, if a Subject
 * has some special properties, Observable returned by `multicast` will have them as well. If you want to use
 * `multicast` with a Subject that is one of the ones included in RxJS by default - {@link Subject},
 * {@link AsyncSubject}, {@link BehaviorSubject}, or {@link ReplaySubject} - simply use {@link publish},
 * {@link publishLast}, {@link publishBehavior} or {@link publishReplay} respectively. These are actually
 * just wrappers around `multicast`, with a specific Subject hardcoded inside.
 *
 * Also, if you use {@link publish} or {@link publishReplay} with a ConnectableObservables `refCount` operator,
 * you can simply use {@link share} and {@link shareReplay} respectively, which chain these two.
 *
 * @example <caption>Use ConnectableObservable</caption>
 * const seconds = Rx.Observable.interval(1000);
 * const connectableSeconds = seconds.multicast(new Subject());
 *
 * connectableSeconds.subscribe(value => console.log('first: ' + value));
 * connectableSeconds.subscribe(value => console.log('second: ' + value));
 *
 * // At this point still nothing happens, even though we subscribed twice.
 *
 * connectableSeconds.connect();
 *
 * // From now on `seconds` are being logged to the console,
 * // twice per every second. `seconds` Observable was however only subscribed once,
 * // so under the hood Observable.interval had only one clock started.
 *
 * @example <caption>Use selector</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds
 *     .multicast(
 *         () => new Subject(),
 *         seconds => seconds.zip(seconds) // Usually zip would subscribe to `seconds` twice.
 *                                         // Because we are inside selector, `seconds` is subscribed once,
 *     )                                   // thus starting only one clock used internally by Observable.interval.
 *     .subscribe();
 *
 * @see {@link publish}
 * @see {@link publishLast}
 * @see {@link publishBehavior}
 * @see {@link publishReplay}
 * @see {@link share}
 * @see {@link shareReplay}
 *
 * @param {Function|Subject} subjectOrSubjectFactory - Factory function to create an intermediate Subject through
 * which the source sequence's elements will be multicast to the selector function input Observable or
 * ConnectableObservable returned by the operator.
 * @param {Function} [selector] - Optional selector function that can use the input stream
 * as many times as needed, without causing multiple subscriptions to the source stream.
 * Subscribers to the input source will receive all notifications of the source from the
 * time of the subscription forward.
 * @return {Observable<T>|ConnectableObservable<T>} An Observable that emits the results of invoking the selector
 * on the source stream or a special {@link ConnectableObservable}, if selector was not provided.
 *
 * @method multicast
 * @owner Observable
 */
function multicast$$1(subjectOrSubjectFactory, selector) {
    return multicast$1(subjectOrSubjectFactory, selector)(this);
}

Observable.prototype.multicast = multicast$$1;

/**
 *
 * Re-emits all notifications from source Observable with specified scheduler.
 *
 * <span class="informal">Ensure a specific scheduler is used, from outside of an Observable.</span>
 *
 * `observeOn` is an operator that accepts a scheduler as a first parameter, which will be used to reschedule
 * notifications emitted by the source Observable. It might be useful, if you do not have control over
 * internal scheduler of a given Observable, but want to control when its values are emitted nevertheless.
 *
 * Returned Observable emits the same notifications (nexted values, complete and error events) as the source Observable,
 * but rescheduled with provided scheduler. Note that this doesn't mean that source Observables internal
 * scheduler will be replaced in any way. Original scheduler still will be used, but when the source Observable emits
 * notification, it will be immediately scheduled again - this time with scheduler passed to `observeOn`.
 * An anti-pattern would be calling `observeOn` on Observable that emits lots of values synchronously, to split
 * that emissions into asynchronous chunks. For this to happen, scheduler would have to be passed into the source
 * Observable directly (usually into the operator that creates it). `observeOn` simply delays notifications a
 * little bit more, to ensure that they are emitted at expected moments.
 *
 * As a matter of fact, `observeOn` accepts second parameter, which specifies in milliseconds with what delay notifications
 * will be emitted. The main difference between {@link delay} operator and `observeOn` is that `observeOn`
 * will delay all notifications - including error notifications - while `delay` will pass through error
 * from source Observable immediately when it is emitted. In general it is highly recommended to use `delay` operator
 * for any kind of delaying of values in the stream, while using `observeOn` to specify which scheduler should be used
 * for notification emissions in general.
 *
 * @example <caption>Ensure values in subscribe are called just before browser repaint.</caption>
 * const intervals = Rx.Observable.interval(10); // Intervals are scheduled
 *                                               // with async scheduler by default...
 *
 * intervals
 * .observeOn(Rx.Scheduler.animationFrame)       // ...but we will observe on animationFrame
 * .subscribe(val => {                           // scheduler to ensure smooth animation.
 *   someDiv.style.height = val + 'px';
 * });
 *
 * @see {@link delay}
 *
 * @param {IScheduler} scheduler Scheduler that will be used to reschedule notifications from source Observable.
 * @param {number} [delay] Number of milliseconds that states with what delay every notification should be rescheduled.
 * @return {Observable<T>} Observable that emits the same notifications as the source Observable,
 * but with provided scheduler.
 *
 * @method observeOn
 * @owner Observable
 */
function observeOn$1(scheduler, delay) {
    if (delay === void 0) { delay = 0; }
    return observeOn(scheduler, delay)(this);
}

Observable.prototype.observeOn = observeOn$1;

/* tslint:enable:max-line-length */
/**
 * When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one
 * that was passed.
 *
 * <span class="informal">Execute series of Observables no matter what, even if it means swallowing errors.</span>
 *
 * <img src="./img/onErrorResumeNext.png" width="100%">
 *
 * `onErrorResumeNext` is an operator that accepts a series of Observables, provided either directly as
 * arguments or as an array. If no single Observable is provided, returned Observable will simply behave the same
 * as the source.
 *
 * `onErrorResumeNext` returns an Observable that starts by subscribing and re-emitting values from the source Observable.
 * When its stream of values ends - no matter if Observable completed or emitted an error - `onErrorResumeNext`
 * will subscribe to the first Observable that was passed as an argument to the method. It will start re-emitting
 * its values as well and - again - when that stream ends, `onErrorResumeNext` will proceed to subscribing yet another
 * Observable in provided series, no matter if previous Observable completed or ended with an error. This will
 * be happening until there is no more Observables left in the series, at which point returned Observable will
 * complete - even if the last subscribed stream ended with an error.
 *
 * `onErrorResumeNext` can be therefore thought of as version of {@link concat} operator, which is more permissive
 * when it comes to the errors emitted by its input Observables. While `concat` subscribes to the next Observable
 * in series only if previous one successfully completed, `onErrorResumeNext` subscribes even if it ended with
 * an error.
 *
 * Note that you do not get any access to errors emitted by the Observables. In particular do not
 * expect these errors to appear in error callback passed to {@link subscribe}. If you want to take
 * specific actions based on what error was emitted by an Observable, you should try out {@link catch} instead.
 *
 *
 * @example <caption>Subscribe to the next Observable after map fails</caption>
 * Rx.Observable.of(1, 2, 3, 0)
 *   .map(x => {
 *       if (x === 0) { throw Error(); }
         return 10 / x;
 *   })
 *   .onErrorResumeNext(Rx.Observable.of(1, 2, 3))
 *   .subscribe(
 *     val => console.log(val),
 *     err => console.log(err),          // Will never be called.
 *     () => console.log('that\'s it!')
 *   );
 *
 * // Logs:
 * // 10
 * // 5
 * // 3.3333333333333335
 * // 1
 * // 2
 * // 3
 * // "that's it!"
 *
 * @see {@link concat}
 * @see {@link catch}
 *
 * @param {...ObservableInput} observables Observables passed either directly or as an array.
 * @return {Observable} An Observable that emits values from source Observable, but - if it errors - subscribes
 * to the next passed Observable and so on, until it completes or runs out of Observables.
 * @method onErrorResumeNext
 * @owner Observable
 */
function onErrorResumeNext$2() {
    var nextSources = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        nextSources[_i - 0] = arguments[_i];
    }
    return onErrorResumeNext$1.apply(void 0, nextSources)(this);
}

Observable.prototype.onErrorResumeNext = onErrorResumeNext$2;

/**
 * Groups pairs of consecutive emissions together and emits them as an array of
 * two values.
 *
 * <span class="informal">Puts the current value and previous value together as
 * an array, and emits that.</span>
 *
 * <img src="./img/pairwise.png" width="100%">
 *
 * The Nth emission from the source Observable will cause the output Observable
 * to emit an array [(N-1)th, Nth] of the previous and the current value, as a
 * pair. For this reason, `pairwise` emits on the second and subsequent
 * emissions from the source Observable, but not on the first emission, because
 * there is no previous value in that case.
 *
 * @example <caption>On every click (starting from the second), emit the relative distance to the previous click</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var pairs = clicks.pairwise();
 * var distance = pairs.map(pair => {
 *   var x0 = pair[0].clientX;
 *   var y0 = pair[0].clientY;
 *   var x1 = pair[1].clientX;
 *   var y1 = pair[1].clientY;
 *   return Math.sqrt(Math.pow(x0 - x1, 2) + Math.pow(y0 - y1, 2));
 * });
 * distance.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 *
 * @return {Observable<Array<T>>} An Observable of pairs (as arrays) of
 * consecutive values from the source Observable.
 * @method pairwise
 * @owner Observable
 */
function pairwise$1() {
    return function (source) { return source.lift(new PairwiseOperator()); };
}
var PairwiseOperator = (function () {
    function PairwiseOperator() {
    }
    PairwiseOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new PairwiseSubscriber(subscriber));
    };
    return PairwiseOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var PairwiseSubscriber = (function (_super) {
    __extends(PairwiseSubscriber, _super);
    function PairwiseSubscriber(destination) {
        _super.call(this, destination);
        this.hasPrev = false;
    }
    PairwiseSubscriber.prototype._next = function (value) {
        if (this.hasPrev) {
            this.destination.next([this.prev, value]);
        }
        else {
            this.hasPrev = true;
        }
        this.prev = value;
    };
    return PairwiseSubscriber;
}(Subscriber));

/**
 * Groups pairs of consecutive emissions together and emits them as an array of
 * two values.
 *
 * <span class="informal">Puts the current value and previous value together as
 * an array, and emits that.</span>
 *
 * <img src="./img/pairwise.png" width="100%">
 *
 * The Nth emission from the source Observable will cause the output Observable
 * to emit an array [(N-1)th, Nth] of the previous and the current value, as a
 * pair. For this reason, `pairwise` emits on the second and subsequent
 * emissions from the source Observable, but not on the first emission, because
 * there is no previous value in that case.
 *
 * @example <caption>On every click (starting from the second), emit the relative distance to the previous click</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var pairs = clicks.pairwise();
 * var distance = pairs.map(pair => {
 *   var x0 = pair[0].clientX;
 *   var y0 = pair[0].clientY;
 *   var x1 = pair[1].clientX;
 *   var y1 = pair[1].clientY;
 *   return Math.sqrt(Math.pow(x0 - x1, 2) + Math.pow(y0 - y1, 2));
 * });
 * distance.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 *
 * @return {Observable<Array<T>>} An Observable of pairs (as arrays) of
 * consecutive values from the source Observable.
 * @method pairwise
 * @owner Observable
 */
function pairwise$$1() {
    return pairwise$1()(this);
}

Observable.prototype.pairwise = pairwise$$1;

function not(pred, thisArg) {
    function notPred() {
        return !(notPred.pred.apply(notPred.thisArg, arguments));
    }
    notPred.pred = pred;
    notPred.thisArg = thisArg;
    return notPred;
}

/**
 * Splits the source Observable into two, one with values that satisfy a
 * predicate, and another with values that don't satisfy the predicate.
 *
 * <span class="informal">It's like {@link filter}, but returns two Observables:
 * one like the output of {@link filter}, and the other with values that did not
 * pass the condition.</span>
 *
 * <img src="./img/partition.png" width="100%">
 *
 * `partition` outputs an array with two Observables that partition the values
 * from the source Observable through the given `predicate` function. The first
 * Observable in that array emits source values for which the predicate argument
 * returns true. The second Observable emits source values for which the
 * predicate returns false. The first behaves like {@link filter} and the second
 * behaves like {@link filter} with the predicate negated.
 *
 * @example <caption>Partition click events into those on DIV elements and those elsewhere</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var parts = clicks.partition(ev => ev.target.tagName === 'DIV');
 * var clicksOnDivs = parts[0];
 * var clicksElsewhere = parts[1];
 * clicksOnDivs.subscribe(x => console.log('DIV clicked: ', x));
 * clicksElsewhere.subscribe(x => console.log('Other clicked: ', x));
 *
 * @see {@link filter}
 *
 * @param {function(value: T, index: number): boolean} predicate A function that
 * evaluates each value emitted by the source Observable. If it returns `true`,
 * the value is emitted on the first Observable in the returned array, if
 * `false` the value is emitted on the second Observable in the array. The
 * `index` parameter is the number `i` for the i-th source emission that has
 * happened since the subscription, starting from the number `0`.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {[Observable<T>, Observable<T>]} An array with two Observables: one
 * with values that passed the predicate, and another with values that did not
 * pass the predicate.
 * @method partition
 * @owner Observable
 */
function partition$1(predicate, thisArg) {
    return function (source) { return [
        filter$1(predicate, thisArg)(source),
        filter$1(not(predicate, thisArg))(source)
    ]; };
}

/**
 * Splits the source Observable into two, one with values that satisfy a
 * predicate, and another with values that don't satisfy the predicate.
 *
 * <span class="informal">It's like {@link filter}, but returns two Observables:
 * one like the output of {@link filter}, and the other with values that did not
 * pass the condition.</span>
 *
 * <img src="./img/partition.png" width="100%">
 *
 * `partition` outputs an array with two Observables that partition the values
 * from the source Observable through the given `predicate` function. The first
 * Observable in that array emits source values for which the predicate argument
 * returns true. The second Observable emits source values for which the
 * predicate returns false. The first behaves like {@link filter} and the second
 * behaves like {@link filter} with the predicate negated.
 *
 * @example <caption>Partition click events into those on DIV elements and those elsewhere</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var parts = clicks.partition(ev => ev.target.tagName === 'DIV');
 * var clicksOnDivs = parts[0];
 * var clicksElsewhere = parts[1];
 * clicksOnDivs.subscribe(x => console.log('DIV clicked: ', x));
 * clicksElsewhere.subscribe(x => console.log('Other clicked: ', x));
 *
 * @see {@link filter}
 *
 * @param {function(value: T, index: number): boolean} predicate A function that
 * evaluates each value emitted by the source Observable. If it returns `true`,
 * the value is emitted on the first Observable in the returned array, if
 * `false` the value is emitted on the second Observable in the array. The
 * `index` parameter is the number `i` for the i-th source emission that has
 * happened since the subscription, starting from the number `0`.
 * @param {any} [thisArg] An optional argument to determine the value of `this`
 * in the `predicate` function.
 * @return {[Observable<T>, Observable<T>]} An array with two Observables: one
 * with values that passed the predicate, and another with values that did not
 * pass the predicate.
 * @method partition
 * @owner Observable
 */
function partition$$1(predicate, thisArg) {
    return partition$1(predicate, thisArg)(this);
}

Observable.prototype.partition = partition$$1;

/**
 * Maps each source value (an object) to its specified nested property.
 *
 * <span class="informal">Like {@link map}, but meant only for picking one of
 * the nested properties of every emitted object.</span>
 *
 * <img src="./img/pluck.png" width="100%">
 *
 * Given a list of strings describing a path to an object property, retrieves
 * the value of a specified nested property from all values in the source
 * Observable. If a property can't be resolved, it will return `undefined` for
 * that value.
 *
 * @example <caption>Map every click to the tagName of the clicked target element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var tagNames = clicks.pluck('target', 'tagName');
 * tagNames.subscribe(x => console.log(x));
 *
 * @see {@link map}
 *
 * @param {...string} properties The nested properties to pluck from each source
 * value (an object).
 * @return {Observable} A new Observable of property values from the source values.
 * @method pluck
 * @owner Observable
 */
function pluck$1() {
    var properties = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        properties[_i - 0] = arguments[_i];
    }
    var length = properties.length;
    if (length === 0) {
        throw new Error('list of properties cannot be empty.');
    }
    return function (source) { return map(plucker(properties, length))(source); };
}
function plucker(props, length) {
    var mapper = function (x) {
        var currentProp = x;
        for (var i = 0; i < length; i++) {
            var p = currentProp[props[i]];
            if (typeof p !== 'undefined') {
                currentProp = p;
            }
            else {
                return undefined;
            }
        }
        return currentProp;
    };
    return mapper;
}

/**
 * Maps each source value (an object) to its specified nested property.
 *
 * <span class="informal">Like {@link map}, but meant only for picking one of
 * the nested properties of every emitted object.</span>
 *
 * <img src="./img/pluck.png" width="100%">
 *
 * Given a list of strings describing a path to an object property, retrieves
 * the value of a specified nested property from all values in the source
 * Observable. If a property can't be resolved, it will return `undefined` for
 * that value.
 *
 * @example <caption>Map every click to the tagName of the clicked target element</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var tagNames = clicks.pluck('target', 'tagName');
 * tagNames.subscribe(x => console.log(x));
 *
 * @see {@link map}
 *
 * @param {...string} properties The nested properties to pluck from each source
 * value (an object).
 * @return {Observable} A new Observable of property values from the source values.
 * @method pluck
 * @owner Observable
 */
function pluck$$1() {
    var properties = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        properties[_i - 0] = arguments[_i];
    }
    return pluck$1.apply(void 0, properties)(this);
}

Observable.prototype.pluck = pluck$$1;

/* tslint:enable:max-line-length */
/**
 * Returns a ConnectableObservable, which is a variety of Observable that waits until its connect method is called
 * before it begins emitting items to those Observers that have subscribed to it.
 *
 * <img src="./img/publish.png" width="100%">
 *
 * @param {Function} [selector] - Optional selector function which can use the multicasted source sequence as many times
 * as needed, without causing multiple subscriptions to the source sequence.
 * Subscribers to the given source will receive all notifications of the source from the time of the subscription on.
 * @return A ConnectableObservable that upon connection causes the source Observable to emit items to its Observers.
 * @method publish
 * @owner Observable
 */
function publish$1(selector) {
    return selector ?
        multicast$1(function () { return new Subject(); }, selector) :
        multicast$1(new Subject());
}

/* tslint:enable:max-line-length */
/**
 * Returns a ConnectableObservable, which is a variety of Observable that waits until its connect method is called
 * before it begins emitting items to those Observers that have subscribed to it.
 *
 * <img src="./img/publish.png" width="100%">
 *
 * @param {Function} [selector] - Optional selector function which can use the multicasted source sequence as many times
 * as needed, without causing multiple subscriptions to the source sequence.
 * Subscribers to the given source will receive all notifications of the source from the time of the subscription on.
 * @return A ConnectableObservable that upon connection causes the source Observable to emit items to its Observers.
 * @method publish
 * @owner Observable
 */
function publish$$1(selector) {
    return publish$1(selector)(this);
}

Observable.prototype.publish = publish$$1;

/**
 * @class BehaviorSubject<T>
 */
var BehaviorSubject = (function (_super) {
    __extends(BehaviorSubject, _super);
    function BehaviorSubject(_value) {
        _super.call(this);
        this._value = _value;
    }
    Object.defineProperty(BehaviorSubject.prototype, "value", {
        get: function () {
            return this.getValue();
        },
        enumerable: true,
        configurable: true
    });
    /** @deprecated internal use only */ BehaviorSubject.prototype._subscribe = function (subscriber) {
        var subscription = _super.prototype._subscribe.call(this, subscriber);
        if (subscription && !subscription.closed) {
            subscriber.next(this._value);
        }
        return subscription;
    };
    BehaviorSubject.prototype.getValue = function () {
        if (this.hasError) {
            throw this.thrownError;
        }
        else if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        else {
            return this._value;
        }
    };
    BehaviorSubject.prototype.next = function (value) {
        _super.prototype.next.call(this, this._value = value);
    };
    return BehaviorSubject;
}(Subject));

/**
 * @param value
 * @return {ConnectableObservable<T>}
 * @method publishBehavior
 * @owner Observable
 */
function publishBehavior$1(value) {
    return function (source) { return multicast$1(new BehaviorSubject(value))(source); };
}

/**
 * @param value
 * @return {ConnectableObservable<T>}
 * @method publishBehavior
 * @owner Observable
 */
function publishBehavior$$1(value) {
    return publishBehavior$1(value)(this);
}

Observable.prototype.publishBehavior = publishBehavior$$1;

/* tslint:enable:max-line-length */
function publishReplay$1(bufferSize, windowTime, selectorOrScheduler, scheduler) {
    if (selectorOrScheduler && typeof selectorOrScheduler !== 'function') {
        scheduler = selectorOrScheduler;
    }
    var selector = typeof selectorOrScheduler === 'function' ? selectorOrScheduler : undefined;
    var subject = new ReplaySubject(bufferSize, windowTime, scheduler);
    return function (source) { return multicast$1(function () { return subject; }, selector)(source); };
}

/* tslint:enable:max-line-length */
/**
 * @param bufferSize
 * @param windowTime
 * @param selectorOrScheduler
 * @param scheduler
 * @return {Observable<T> | ConnectableObservable<T>}
 * @method publishReplay
 * @owner Observable
 */
function publishReplay$$1(bufferSize, windowTime, selectorOrScheduler, scheduler) {
    return publishReplay$1(bufferSize, windowTime, selectorOrScheduler, scheduler)(this);
}

Observable.prototype.publishReplay = publishReplay$$1;

function publishLast$1() {
    return function (source) { return multicast$1(new AsyncSubject())(source); };
}

/**
 * @return {ConnectableObservable<T>}
 * @method publishLast
 * @owner Observable
 */
function publishLast$$1() {
    //TODO(benlesh): correct type-flow through here.
    return publishLast$1()(this);
}

Observable.prototype.publishLast = publishLast$$1;

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that mirrors the first source Observable to emit an item
 * from the combination of this Observable and supplied Observables.
 * @param {...Observables} ...observables Sources used to race for which Observable emits first.
 * @return {Observable} An Observable that mirrors the output of the first Observable to emit an item.
 * @method race
 * @owner Observable
 */
function race$2() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return function raceOperatorFunction(source) {
        // if the only argument is an array, it was most likely called with
        // `pair([obs1, obs2, ...])`
        if (observables.length === 1 && isArray(observables[0])) {
            observables = observables[0];
        }
        return source.lift.call(race.apply(void 0, [source].concat(observables)));
    };
}

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that mirrors the first source Observable to emit an item
 * from the combination of this Observable and supplied Observables.
 * @param {...Observables} ...observables Sources used to race for which Observable emits first.
 * @return {Observable} An Observable that mirrors the output of the first Observable to emit an item.
 * @method race
 * @owner Observable
 */
function race$1() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return race$2.apply(void 0, observables)(this);
}

Observable.prototype.race = race$1;

/* tslint:enable:max-line-length */
/**
 * Applies an accumulator function over the source Observable, and returns the
 * accumulated result when the source completes, given an optional seed value.
 *
 * <span class="informal">Combines together all values emitted on the source,
 * using an accumulator function that knows how to join a new source value into
 * the accumulation from the past.</span>
 *
 * <img src="./img/reduce.png" width="100%">
 *
 * Like
 * [Array.prototype.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce),
 * `reduce` applies an `accumulator` function against an accumulation and each
 * value of the source Observable (from the past) to reduce it to a single
 * value, emitted on the output Observable. Note that `reduce` will only emit
 * one value, only when the source Observable completes. It is equivalent to
 * applying operator {@link scan} followed by operator {@link last}.
 *
 * Returns an Observable that applies a specified `accumulator` function to each
 * item emitted by the source Observable. If a `seed` value is specified, then
 * that value will be used as the initial value for the accumulator. If no seed
 * value is specified, the first item of the source is used as the seed.
 *
 * @example <caption>Count the number of click events that happened in 5 seconds</caption>
 * var clicksInFiveSeconds = Rx.Observable.fromEvent(document, 'click')
 *   .takeUntil(Rx.Observable.interval(5000));
 * var ones = clicksInFiveSeconds.mapTo(1);
 * var seed = 0;
 * var count = ones.reduce((acc, one) => acc + one, seed);
 * count.subscribe(x => console.log(x));
 *
 * @see {@link count}
 * @see {@link expand}
 * @see {@link mergeScan}
 * @see {@link scan}
 *
 * @param {function(acc: R, value: T, index: number): R} accumulator The accumulator function
 * called on each source value.
 * @param {R} [seed] The initial accumulation value.
 * @return {Observable<R>} An Observable that emits a single value that is the
 * result of accumulating the values emitted by the source Observable.
 * @method reduce
 * @owner Observable
 */
function reduce$1(accumulator, seed) {
    // providing a seed of `undefined` *should* be valid and trigger
    // hasSeed! so don't use `seed !== undefined` checks!
    // For this reason, we have to check it here at the original call site
    // otherwise inside Operator/Subscriber we won't know if `undefined`
    // means they didn't provide anything or if they literally provided `undefined`
    if (arguments.length >= 2) {
        return reduce(accumulator, seed)(this);
    }
    return reduce(accumulator)(this);
}

Observable.prototype.reduce = reduce$1;

/**
 * Returns an Observable that repeats the stream of items emitted by the source Observable at most count times.
 *
 * <img src="./img/repeat.png" width="100%">
 *
 * @param {number} [count] The number of times the source Observable items are repeated, a count of 0 will yield
 * an empty Observable.
 * @return {Observable} An Observable that repeats the stream of items emitted by the source Observable at most
 * count times.
 * @method repeat
 * @owner Observable
 */
function repeat$1(count) {
    if (count === void 0) { count = -1; }
    return function (source) {
        if (count === 0) {
            return new EmptyObservable();
        }
        else if (count < 0) {
            return source.lift(new RepeatOperator(-1, source));
        }
        else {
            return source.lift(new RepeatOperator(count - 1, source));
        }
    };
}
var RepeatOperator = (function () {
    function RepeatOperator(count, source) {
        this.count = count;
        this.source = source;
    }
    RepeatOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new RepeatSubscriber(subscriber, this.count, this.source));
    };
    return RepeatOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var RepeatSubscriber = (function (_super) {
    __extends(RepeatSubscriber, _super);
    function RepeatSubscriber(destination, count, source) {
        _super.call(this, destination);
        this.count = count;
        this.source = source;
    }
    RepeatSubscriber.prototype.complete = function () {
        if (!this.isStopped) {
            var _a = this, source = _a.source, count = _a.count;
            if (count === 0) {
                return _super.prototype.complete.call(this);
            }
            else if (count > -1) {
                this.count = count - 1;
            }
            source.subscribe(this._unsubscribeAndRecycle());
        }
    };
    return RepeatSubscriber;
}(Subscriber));

/**
 * Returns an Observable that repeats the stream of items emitted by the source Observable at most count times.
 *
 * <img src="./img/repeat.png" width="100%">
 *
 * @param {number} [count] The number of times the source Observable items are repeated, a count of 0 will yield
 * an empty Observable.
 * @return {Observable} An Observable that repeats the stream of items emitted by the source Observable at most
 * count times.
 * @method repeat
 * @owner Observable
 */
function repeat$$1(count) {
    if (count === void 0) { count = -1; }
    return repeat$1(count)(this);
}

Observable.prototype.repeat = repeat$$1;

/**
 * Returns an Observable that mirrors the source Observable with the exception of a `complete`. If the source
 * Observable calls `complete`, this method will emit to the Observable returned from `notifier`. If that Observable
 * calls `complete` or `error`, then this method will call `complete` or `error` on the child subscription. Otherwise
 * this method will resubscribe to the source Observable.
 *
 * <img src="./img/repeatWhen.png" width="100%">
 *
 * @param {function(notifications: Observable): Observable} notifier - Receives an Observable of notifications with
 * which a user can `complete` or `error`, aborting the repetition.
 * @return {Observable} The source Observable modified with repeat logic.
 * @method repeatWhen
 * @owner Observable
 */
function repeatWhen$1(notifier) {
    return function (source) { return source.lift(new RepeatWhenOperator(notifier)); };
}
var RepeatWhenOperator = (function () {
    function RepeatWhenOperator(notifier) {
        this.notifier = notifier;
    }
    RepeatWhenOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new RepeatWhenSubscriber(subscriber, this.notifier, source));
    };
    return RepeatWhenOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var RepeatWhenSubscriber = (function (_super) {
    __extends(RepeatWhenSubscriber, _super);
    function RepeatWhenSubscriber(destination, notifier, source) {
        _super.call(this, destination);
        this.notifier = notifier;
        this.source = source;
        this.sourceIsBeingSubscribedTo = true;
    }
    RepeatWhenSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.sourceIsBeingSubscribedTo = true;
        this.source.subscribe(this);
    };
    RepeatWhenSubscriber.prototype.notifyComplete = function (innerSub) {
        if (this.sourceIsBeingSubscribedTo === false) {
            return _super.prototype.complete.call(this);
        }
    };
    RepeatWhenSubscriber.prototype.complete = function () {
        this.sourceIsBeingSubscribedTo = false;
        if (!this.isStopped) {
            if (!this.retries) {
                this.subscribeToRetries();
            }
            if (!this.retriesSubscription || this.retriesSubscription.closed) {
                return _super.prototype.complete.call(this);
            }
            this._unsubscribeAndRecycle();
            this.notifications.next();
        }
    };
    /** @deprecated internal use only */ RepeatWhenSubscriber.prototype._unsubscribe = function () {
        var _a = this, notifications = _a.notifications, retriesSubscription = _a.retriesSubscription;
        if (notifications) {
            notifications.unsubscribe();
            this.notifications = null;
        }
        if (retriesSubscription) {
            retriesSubscription.unsubscribe();
            this.retriesSubscription = null;
        }
        this.retries = null;
    };
    /** @deprecated internal use only */ RepeatWhenSubscriber.prototype._unsubscribeAndRecycle = function () {
        var _a = this, notifications = _a.notifications, retries = _a.retries, retriesSubscription = _a.retriesSubscription;
        this.notifications = null;
        this.retries = null;
        this.retriesSubscription = null;
        _super.prototype._unsubscribeAndRecycle.call(this);
        this.notifications = notifications;
        this.retries = retries;
        this.retriesSubscription = retriesSubscription;
        return this;
    };
    RepeatWhenSubscriber.prototype.subscribeToRetries = function () {
        this.notifications = new Subject();
        var retries = tryCatch(this.notifier)(this.notifications);
        if (retries === errorObject) {
            return _super.prototype.complete.call(this);
        }
        this.retries = retries;
        this.retriesSubscription = subscribeToResult(this, retries);
    };
    return RepeatWhenSubscriber;
}(OuterSubscriber));

/**
 * Returns an Observable that mirrors the source Observable with the exception of a `complete`. If the source
 * Observable calls `complete`, this method will emit to the Observable returned from `notifier`. If that Observable
 * calls `complete` or `error`, then this method will call `complete` or `error` on the child subscription. Otherwise
 * this method will resubscribe to the source Observable.
 *
 * <img src="./img/repeatWhen.png" width="100%">
 *
 * @param {function(notifications: Observable): Observable} notifier - Receives an Observable of notifications with
 * which a user can `complete` or `error`, aborting the repetition.
 * @return {Observable} The source Observable modified with repeat logic.
 * @method repeatWhen
 * @owner Observable
 */
function repeatWhen$$1(notifier) {
    return repeatWhen$1(notifier)(this);
}

Observable.prototype.repeatWhen = repeatWhen$$1;

/**
 * Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
 * calls `error`, this method will resubscribe to the source Observable for a maximum of `count` resubscriptions (given
 * as a number parameter) rather than propagating the `error` call.
 *
 * <img src="./img/retry.png" width="100%">
 *
 * Any and all items emitted by the source Observable will be emitted by the resulting Observable, even those emitted
 * during failed subscriptions. For example, if an Observable fails at first but emits [1, 2] then succeeds the second
 * time and emits: [1, 2, 3, 4, 5] then the complete stream of emissions and notifications
 * would be: [1, 2, 1, 2, 3, 4, 5, `complete`].
 * @param {number} count - Number of retry attempts before failing.
 * @return {Observable} The source Observable modified with the retry logic.
 * @method retry
 * @owner Observable
 */
function retry$1(count) {
    if (count === void 0) { count = -1; }
    return function (source) { return source.lift(new RetryOperator(count, source)); };
}
var RetryOperator = (function () {
    function RetryOperator(count, source) {
        this.count = count;
        this.source = source;
    }
    RetryOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new RetrySubscriber(subscriber, this.count, this.source));
    };
    return RetryOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var RetrySubscriber = (function (_super) {
    __extends(RetrySubscriber, _super);
    function RetrySubscriber(destination, count, source) {
        _super.call(this, destination);
        this.count = count;
        this.source = source;
    }
    RetrySubscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            var _a = this, source = _a.source, count = _a.count;
            if (count === 0) {
                return _super.prototype.error.call(this, err);
            }
            else if (count > -1) {
                this.count = count - 1;
            }
            source.subscribe(this._unsubscribeAndRecycle());
        }
    };
    return RetrySubscriber;
}(Subscriber));

/**
 * Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
 * calls `error`, this method will resubscribe to the source Observable for a maximum of `count` resubscriptions (given
 * as a number parameter) rather than propagating the `error` call.
 *
 * <img src="./img/retry.png" width="100%">
 *
 * Any and all items emitted by the source Observable will be emitted by the resulting Observable, even those emitted
 * during failed subscriptions. For example, if an Observable fails at first but emits [1, 2] then succeeds the second
 * time and emits: [1, 2, 3, 4, 5] then the complete stream of emissions and notifications
 * would be: [1, 2, 1, 2, 3, 4, 5, `complete`].
 * @param {number} count - Number of retry attempts before failing.
 * @return {Observable} The source Observable modified with the retry logic.
 * @method retry
 * @owner Observable
 */
function retry$$1(count) {
    if (count === void 0) { count = -1; }
    return retry$1(count)(this);
}

Observable.prototype.retry = retry$$1;

/**
 * Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
 * calls `error`, this method will emit the Throwable that caused the error to the Observable returned from `notifier`.
 * If that Observable calls `complete` or `error` then this method will call `complete` or `error` on the child
 * subscription. Otherwise this method will resubscribe to the source Observable.
 *
 * <img src="./img/retryWhen.png" width="100%">
 *
 * @param {function(errors: Observable): Observable} notifier - Receives an Observable of notifications with which a
 * user can `complete` or `error`, aborting the retry.
 * @return {Observable} The source Observable modified with retry logic.
 * @method retryWhen
 * @owner Observable
 */
function retryWhen$1(notifier) {
    return function (source) { return source.lift(new RetryWhenOperator(notifier, source)); };
}
var RetryWhenOperator = (function () {
    function RetryWhenOperator(notifier, source) {
        this.notifier = notifier;
        this.source = source;
    }
    RetryWhenOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new RetryWhenSubscriber(subscriber, this.notifier, this.source));
    };
    return RetryWhenOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var RetryWhenSubscriber = (function (_super) {
    __extends(RetryWhenSubscriber, _super);
    function RetryWhenSubscriber(destination, notifier, source) {
        _super.call(this, destination);
        this.notifier = notifier;
        this.source = source;
    }
    RetryWhenSubscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            var errors = this.errors;
            var retries = this.retries;
            var retriesSubscription = this.retriesSubscription;
            if (!retries) {
                errors = new Subject();
                retries = tryCatch(this.notifier)(errors);
                if (retries === errorObject) {
                    return _super.prototype.error.call(this, errorObject.e);
                }
                retriesSubscription = subscribeToResult(this, retries);
            }
            else {
                this.errors = null;
                this.retriesSubscription = null;
            }
            this._unsubscribeAndRecycle();
            this.errors = errors;
            this.retries = retries;
            this.retriesSubscription = retriesSubscription;
            errors.next(err);
        }
    };
    /** @deprecated internal use only */ RetryWhenSubscriber.prototype._unsubscribe = function () {
        var _a = this, errors = _a.errors, retriesSubscription = _a.retriesSubscription;
        if (errors) {
            errors.unsubscribe();
            this.errors = null;
        }
        if (retriesSubscription) {
            retriesSubscription.unsubscribe();
            this.retriesSubscription = null;
        }
        this.retries = null;
    };
    RetryWhenSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var _a = this, errors = _a.errors, retries = _a.retries, retriesSubscription = _a.retriesSubscription;
        this.errors = null;
        this.retries = null;
        this.retriesSubscription = null;
        this._unsubscribeAndRecycle();
        this.errors = errors;
        this.retries = retries;
        this.retriesSubscription = retriesSubscription;
        this.source.subscribe(this);
    };
    return RetryWhenSubscriber;
}(OuterSubscriber));

/**
 * Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
 * calls `error`, this method will emit the Throwable that caused the error to the Observable returned from `notifier`.
 * If that Observable calls `complete` or `error` then this method will call `complete` or `error` on the child
 * subscription. Otherwise this method will resubscribe to the source Observable.
 *
 * <img src="./img/retryWhen.png" width="100%">
 *
 * @param {function(errors: Observable): Observable} notifier - Receives an Observable of notifications with which a
 * user can `complete` or `error`, aborting the retry.
 * @return {Observable} The source Observable modified with retry logic.
 * @method retryWhen
 * @owner Observable
 */
function retryWhen$$1(notifier) {
    return retryWhen$1(notifier)(this);
}

Observable.prototype.retryWhen = retryWhen$$1;

/**
 * Emits the most recently emitted value from the source Observable whenever
 * another Observable, the `notifier`, emits.
 *
 * <span class="informal">It's like {@link sampleTime}, but samples whenever
 * the `notifier` Observable emits something.</span>
 *
 * <img src="./img/sample.png" width="100%">
 *
 * Whenever the `notifier` Observable emits a value or completes, `sample`
 * looks at the source Observable and emits whichever value it has most recently
 * emitted since the previous sampling, unless the source has not emitted
 * anything since the previous sampling. The `notifier` is subscribed to as soon
 * as the output Observable is subscribed.
 *
 * @example <caption>On every click, sample the most recent "seconds" timer</caption>
 * var seconds = Rx.Observable.interval(1000);
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = seconds.sample(clicks);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounce}
 * @see {@link sampleTime}
 * @see {@link throttle}
 *
 * @param {Observable<any>} notifier The Observable to use for sampling the
 * source Observable.
 * @return {Observable<T>} An Observable that emits the results of sampling the
 * values emitted by the source Observable whenever the notifier Observable
 * emits value or completes.
 * @method sample
 * @owner Observable
 */
function sample$1(notifier) {
    return function (source) { return source.lift(new SampleOperator(notifier)); };
}
var SampleOperator = (function () {
    function SampleOperator(notifier) {
        this.notifier = notifier;
    }
    SampleOperator.prototype.call = function (subscriber, source) {
        var sampleSubscriber = new SampleSubscriber(subscriber);
        var subscription = source.subscribe(sampleSubscriber);
        subscription.add(subscribeToResult(sampleSubscriber, this.notifier));
        return subscription;
    };
    return SampleOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SampleSubscriber = (function (_super) {
    __extends(SampleSubscriber, _super);
    function SampleSubscriber() {
        _super.apply(this, arguments);
        this.hasValue = false;
    }
    SampleSubscriber.prototype._next = function (value) {
        this.value = value;
        this.hasValue = true;
    };
    SampleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.emitValue();
    };
    SampleSubscriber.prototype.notifyComplete = function () {
        this.emitValue();
    };
    SampleSubscriber.prototype.emitValue = function () {
        if (this.hasValue) {
            this.hasValue = false;
            this.destination.next(this.value);
        }
    };
    return SampleSubscriber;
}(OuterSubscriber));

/**
 * Emits the most recently emitted value from the source Observable whenever
 * another Observable, the `notifier`, emits.
 *
 * <span class="informal">It's like {@link sampleTime}, but samples whenever
 * the `notifier` Observable emits something.</span>
 *
 * <img src="./img/sample.png" width="100%">
 *
 * Whenever the `notifier` Observable emits a value or completes, `sample`
 * looks at the source Observable and emits whichever value it has most recently
 * emitted since the previous sampling, unless the source has not emitted
 * anything since the previous sampling. The `notifier` is subscribed to as soon
 * as the output Observable is subscribed.
 *
 * @example <caption>On every click, sample the most recent "seconds" timer</caption>
 * var seconds = Rx.Observable.interval(1000);
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = seconds.sample(clicks);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounce}
 * @see {@link sampleTime}
 * @see {@link throttle}
 *
 * @param {Observable<any>} notifier The Observable to use for sampling the
 * source Observable.
 * @return {Observable<T>} An Observable that emits the results of sampling the
 * values emitted by the source Observable whenever the notifier Observable
 * emits value or completes.
 * @method sample
 * @owner Observable
 */
function sample$$1(notifier) {
    return sample$1(notifier)(this);
}

Observable.prototype.sample = sample$$1;

/**
 * Emits the most recently emitted value from the source Observable within
 * periodic time intervals.
 *
 * <span class="informal">Samples the source Observable at periodic time
 * intervals, emitting what it samples.</span>
 *
 * <img src="./img/sampleTime.png" width="100%">
 *
 * `sampleTime` periodically looks at the source Observable and emits whichever
 * value it has most recently emitted since the previous sampling, unless the
 * source has not emitted anything since the previous sampling. The sampling
 * happens periodically in time every `period` milliseconds (or the time unit
 * defined by the optional `scheduler` argument). The sampling starts as soon as
 * the output Observable is subscribed.
 *
 * @example <caption>Every second, emit the most recent click at most once</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.sampleTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounceTime}
 * @see {@link delay}
 * @see {@link sample}
 * @see {@link throttleTime}
 *
 * @param {number} period The sampling period expressed in milliseconds or the
 * time unit determined internally by the optional `scheduler`.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the sampling.
 * @return {Observable<T>} An Observable that emits the results of sampling the
 * values emitted by the source Observable at the specified time interval.
 * @method sampleTime
 * @owner Observable
 */
function sampleTime$1(period, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return function (source) { return source.lift(new SampleTimeOperator(period, scheduler)); };
}
var SampleTimeOperator = (function () {
    function SampleTimeOperator(period, scheduler) {
        this.period = period;
        this.scheduler = scheduler;
    }
    SampleTimeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SampleTimeSubscriber(subscriber, this.period, this.scheduler));
    };
    return SampleTimeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SampleTimeSubscriber = (function (_super) {
    __extends(SampleTimeSubscriber, _super);
    function SampleTimeSubscriber(destination, period, scheduler) {
        _super.call(this, destination);
        this.period = period;
        this.scheduler = scheduler;
        this.hasValue = false;
        this.add(scheduler.schedule(dispatchNotification, period, { subscriber: this, period: period }));
    }
    SampleTimeSubscriber.prototype._next = function (value) {
        this.lastValue = value;
        this.hasValue = true;
    };
    SampleTimeSubscriber.prototype.notifyNext = function () {
        if (this.hasValue) {
            this.hasValue = false;
            this.destination.next(this.lastValue);
        }
    };
    return SampleTimeSubscriber;
}(Subscriber));
function dispatchNotification(state) {
    var subscriber = state.subscriber, period = state.period;
    subscriber.notifyNext();
    this.schedule(state, period);
}

/**
 * Emits the most recently emitted value from the source Observable within
 * periodic time intervals.
 *
 * <span class="informal">Samples the source Observable at periodic time
 * intervals, emitting what it samples.</span>
 *
 * <img src="./img/sampleTime.png" width="100%">
 *
 * `sampleTime` periodically looks at the source Observable and emits whichever
 * value it has most recently emitted since the previous sampling, unless the
 * source has not emitted anything since the previous sampling. The sampling
 * happens periodically in time every `period` milliseconds (or the time unit
 * defined by the optional `scheduler` argument). The sampling starts as soon as
 * the output Observable is subscribed.
 *
 * @example <caption>Every second, emit the most recent click at most once</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.sampleTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounceTime}
 * @see {@link delay}
 * @see {@link sample}
 * @see {@link throttleTime}
 *
 * @param {number} period The sampling period expressed in milliseconds or the
 * time unit determined internally by the optional `scheduler`.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the sampling.
 * @return {Observable<T>} An Observable that emits the results of sampling the
 * values emitted by the source Observable at the specified time interval.
 * @method sampleTime
 * @owner Observable
 */
function sampleTime$$1(period, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return sampleTime$1(period, scheduler)(this);
}

Observable.prototype.sampleTime = sampleTime$$1;

/* tslint:enable:max-line-length */
/**
 * Applies an accumulator function over the source Observable, and returns each
 * intermediate result, with an optional seed value.
 *
 * <span class="informal">It's like {@link reduce}, but emits the current
 * accumulation whenever the source emits a value.</span>
 *
 * <img src="./img/scan.png" width="100%">
 *
 * Combines together all values emitted on the source, using an accumulator
 * function that knows how to join a new source value into the accumulation from
 * the past. Is similar to {@link reduce}, but emits the intermediate
 * accumulations.
 *
 * Returns an Observable that applies a specified `accumulator` function to each
 * item emitted by the source Observable. If a `seed` value is specified, then
 * that value will be used as the initial value for the accumulator. If no seed
 * value is specified, the first item of the source is used as the seed.
 *
 * @example <caption>Count the number of click events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var ones = clicks.mapTo(1);
 * var seed = 0;
 * var count = ones.scan((acc, one) => acc + one, seed);
 * count.subscribe(x => console.log(x));
 *
 * @see {@link expand}
 * @see {@link mergeScan}
 * @see {@link reduce}
 *
 * @param {function(acc: R, value: T, index: number): R} accumulator
 * The accumulator function called on each source value.
 * @param {T|R} [seed] The initial accumulation value.
 * @return {Observable<R>} An observable of the accumulated values.
 * @method scan
 * @owner Observable
 */
function scan$1(accumulator, seed) {
    if (arguments.length >= 2) {
        return scan(accumulator, seed)(this);
    }
    return scan(accumulator)(this);
}

Observable.prototype.scan = scan$1;

/**
 * Compares all values of two observables in sequence using an optional comparor function
 * and returns an observable of a single boolean value representing whether or not the two sequences
 * are equal.
 *
 * <span class="informal">Checks to see of all values emitted by both observables are equal, in order.</span>
 *
 * <img src="./img/sequenceEqual.png" width="100%">
 *
 * `sequenceEqual` subscribes to two observables and buffers incoming values from each observable. Whenever either
 * observable emits a value, the value is buffered and the buffers are shifted and compared from the bottom
 * up; If any value pair doesn't match, the returned observable will emit `false` and complete. If one of the
 * observables completes, the operator will wait for the other observable to complete; If the other
 * observable emits before completing, the returned observable will emit `false` and complete. If one observable never
 * completes or emits after the other complets, the returned observable will never complete.
 *
 * @example <caption>figure out if the Konami code matches</caption>
 * var code = Rx.Observable.from([
 *  "ArrowUp",
 *  "ArrowUp",
 *  "ArrowDown",
 *  "ArrowDown",
 *  "ArrowLeft",
 *  "ArrowRight",
 *  "ArrowLeft",
 *  "ArrowRight",
 *  "KeyB",
 *  "KeyA",
 *  "Enter" // no start key, clearly.
 * ]);
 *
 * var keys = Rx.Observable.fromEvent(document, 'keyup')
 *  .map(e => e.code);
 * var matches = keys.bufferCount(11, 1)
 *  .mergeMap(
 *    last11 =>
 *      Rx.Observable.from(last11)
 *        .sequenceEqual(code)
 *   );
 * matches.subscribe(matched => console.log('Successful cheat at Contra? ', matched));
 *
 * @see {@link combineLatest}
 * @see {@link zip}
 * @see {@link withLatestFrom}
 *
 * @param {Observable} compareTo The observable sequence to compare the source sequence to.
 * @param {function} [comparor] An optional function to compare each value pair
 * @return {Observable} An Observable of a single boolean value representing whether or not
 * the values emitted by both observables were equal in sequence.
 * @method sequenceEqual
 * @owner Observable
 */
function sequenceEqual$1(compareTo, comparor) {
    return function (source) { return source.lift(new SequenceEqualOperator(compareTo, comparor)); };
}
var SequenceEqualOperator = (function () {
    function SequenceEqualOperator(compareTo, comparor) {
        this.compareTo = compareTo;
        this.comparor = comparor;
    }
    SequenceEqualOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SequenceEqualSubscriber(subscriber, this.compareTo, this.comparor));
    };
    return SequenceEqualOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SequenceEqualSubscriber = (function (_super) {
    __extends(SequenceEqualSubscriber, _super);
    function SequenceEqualSubscriber(destination, compareTo, comparor) {
        _super.call(this, destination);
        this.compareTo = compareTo;
        this.comparor = comparor;
        this._a = [];
        this._b = [];
        this._oneComplete = false;
        this.add(compareTo.subscribe(new SequenceEqualCompareToSubscriber(destination, this)));
    }
    SequenceEqualSubscriber.prototype._next = function (value) {
        if (this._oneComplete && this._b.length === 0) {
            this.emit(false);
        }
        else {
            this._a.push(value);
            this.checkValues();
        }
    };
    SequenceEqualSubscriber.prototype._complete = function () {
        if (this._oneComplete) {
            this.emit(this._a.length === 0 && this._b.length === 0);
        }
        else {
            this._oneComplete = true;
        }
    };
    SequenceEqualSubscriber.prototype.checkValues = function () {
        var _c = this, _a = _c._a, _b = _c._b, comparor = _c.comparor;
        while (_a.length > 0 && _b.length > 0) {
            var a = _a.shift();
            var b = _b.shift();
            var areEqual = false;
            if (comparor) {
                areEqual = tryCatch(comparor)(a, b);
                if (areEqual === errorObject) {
                    this.destination.error(errorObject.e);
                }
            }
            else {
                areEqual = a === b;
            }
            if (!areEqual) {
                this.emit(false);
            }
        }
    };
    SequenceEqualSubscriber.prototype.emit = function (value) {
        var destination = this.destination;
        destination.next(value);
        destination.complete();
    };
    SequenceEqualSubscriber.prototype.nextB = function (value) {
        if (this._oneComplete && this._a.length === 0) {
            this.emit(false);
        }
        else {
            this._b.push(value);
            this.checkValues();
        }
    };
    return SequenceEqualSubscriber;
}(Subscriber));
var SequenceEqualCompareToSubscriber = (function (_super) {
    __extends(SequenceEqualCompareToSubscriber, _super);
    function SequenceEqualCompareToSubscriber(destination, parent) {
        _super.call(this, destination);
        this.parent = parent;
    }
    SequenceEqualCompareToSubscriber.prototype._next = function (value) {
        this.parent.nextB(value);
    };
    SequenceEqualCompareToSubscriber.prototype._error = function (err) {
        this.parent.error(err);
    };
    SequenceEqualCompareToSubscriber.prototype._complete = function () {
        this.parent._complete();
    };
    return SequenceEqualCompareToSubscriber;
}(Subscriber));

/**
 * Compares all values of two observables in sequence using an optional comparor function
 * and returns an observable of a single boolean value representing whether or not the two sequences
 * are equal.
 *
 * <span class="informal">Checks to see of all values emitted by both observables are equal, in order.</span>
 *
 * <img src="./img/sequenceEqual.png" width="100%">
 *
 * `sequenceEqual` subscribes to two observables and buffers incoming values from each observable. Whenever either
 * observable emits a value, the value is buffered and the buffers are shifted and compared from the bottom
 * up; If any value pair doesn't match, the returned observable will emit `false` and complete. If one of the
 * observables completes, the operator will wait for the other observable to complete; If the other
 * observable emits before completing, the returned observable will emit `false` and complete. If one observable never
 * completes or emits after the other complets, the returned observable will never complete.
 *
 * @example <caption>figure out if the Konami code matches</caption>
 * var code = Rx.Observable.from([
 *  "ArrowUp",
 *  "ArrowUp",
 *  "ArrowDown",
 *  "ArrowDown",
 *  "ArrowLeft",
 *  "ArrowRight",
 *  "ArrowLeft",
 *  "ArrowRight",
 *  "KeyB",
 *  "KeyA",
 *  "Enter" // no start key, clearly.
 * ]);
 *
 * var keys = Rx.Observable.fromEvent(document, 'keyup')
 *  .map(e => e.code);
 * var matches = keys.bufferCount(11, 1)
 *  .mergeMap(
 *    last11 =>
 *      Rx.Observable.from(last11)
 *        .sequenceEqual(code)
 *   );
 * matches.subscribe(matched => console.log('Successful cheat at Contra? ', matched));
 *
 * @see {@link combineLatest}
 * @see {@link zip}
 * @see {@link withLatestFrom}
 *
 * @param {Observable} compareTo The observable sequence to compare the source sequence to.
 * @param {function} [comparor] An optional function to compare each value pair
 * @return {Observable} An Observable of a single boolean value representing whether or not
 * the values emitted by both observables were equal in sequence.
 * @method sequenceEqual
 * @owner Observable
 */
function sequenceEqual$$1(compareTo, comparor) {
    return sequenceEqual$1(compareTo, comparor)(this);
}

Observable.prototype.sequenceEqual = sequenceEqual$$1;

function shareSubjectFactory() {
    return new Subject();
}
/**
 * Returns a new Observable that multicasts (shares) the original Observable. As long as there is at least one
 * Subscriber this Observable will be subscribed and emitting data. When all subscribers have unsubscribed it will
 * unsubscribe from the source Observable. Because the Observable is multicasting it makes the stream `hot`.
 * This is an alias for .multicast(() => new Subject()).refCount().
 *
 * <img src="./img/share.png" width="100%">
 *
 * @return {Observable<T>} An Observable that upon connection causes the source Observable to emit items to its Observers.
 * @method share
 * @owner Observable
 */
function share$1() {
    return function (source) { return refCount()(multicast$1(shareSubjectFactory)(source)); };
}

/**
 * Returns a new Observable that multicasts (shares) the original Observable. As long as there is at least one
 * Subscriber this Observable will be subscribed and emitting data. When all subscribers have unsubscribed it will
 * unsubscribe from the source Observable. Because the Observable is multicasting it makes the stream `hot`.
 *
 * This behaves similarly to .publish().refCount(), with a behavior difference when the source observable emits complete.
 * .publish().refCount() will not resubscribe to the original source, however .share() will resubscribe to the original source.
 * Observable.of("test").publish().refCount() will not re-emit "test" on new subscriptions, Observable.of("test").share() will
 * re-emit "test" to new subscriptions.
 *
 * <img src="./img/share.png" width="100%">
 *
 * @return {Observable<T>} An Observable that upon connection causes the source Observable to emit items to its Observers.
 * @method share
 * @owner Observable
 */
function share$$1() {
    return share$1()(this);
}

Observable.prototype.share = share$$1;

/**
 * @method shareReplay
 * @owner Observable
 */
function shareReplay$1(bufferSize, windowTime, scheduler) {
    return function (source) { return source.lift(shareReplayOperator(bufferSize, windowTime, scheduler)); };
}
function shareReplayOperator(bufferSize, windowTime, scheduler) {
    var subject;
    var refCount = 0;
    var subscription;
    var hasError = false;
    var isComplete = false;
    return function shareReplayOperation(source) {
        refCount++;
        if (!subject || hasError) {
            hasError = false;
            subject = new ReplaySubject(bufferSize, windowTime, scheduler);
            subscription = source.subscribe({
                next: function (value) { subject.next(value); },
                error: function (err) {
                    hasError = true;
                    subject.error(err);
                },
                complete: function () {
                    isComplete = true;
                    subject.complete();
                },
            });
        }
        var innerSub = subject.subscribe(this);
        return function () {
            refCount--;
            innerSub.unsubscribe();
            if (subscription && refCount === 0 && isComplete) {
                subscription.unsubscribe();
            }
        };
    };
}

/**
 * @method shareReplay
 * @owner Observable
 */
function shareReplay$$1(bufferSize, windowTime, scheduler) {
    return shareReplay$1(bufferSize, windowTime, scheduler)(this);
}

Observable.prototype.shareReplay = shareReplay$$1;

/**
 * Returns an Observable that emits the single item emitted by the source Observable that matches a specified
 * predicate, if that Observable emits one such item. If the source Observable emits more than one such item or no
 * such items, notify of an IllegalArgumentException or NoSuchElementException respectively.
 *
 * <img src="./img/single.png" width="100%">
 *
 * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
 * callback if the Observable completes before any `next` notification was sent.
 * @param {Function} predicate - A predicate function to evaluate items emitted by the source Observable.
 * @return {Observable<T>} An Observable that emits the single item emitted by the source Observable that matches
 * the predicate.
 .
 * @method single
 * @owner Observable
 */
function single$1(predicate) {
    return function (source) { return source.lift(new SingleOperator(predicate, source)); };
}
var SingleOperator = (function () {
    function SingleOperator(predicate, source) {
        this.predicate = predicate;
        this.source = source;
    }
    SingleOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SingleSubscriber(subscriber, this.predicate, this.source));
    };
    return SingleOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SingleSubscriber = (function (_super) {
    __extends(SingleSubscriber, _super);
    function SingleSubscriber(destination, predicate, source) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.source = source;
        this.seenValue = false;
        this.index = 0;
    }
    SingleSubscriber.prototype.applySingleValue = function (value) {
        if (this.seenValue) {
            this.destination.error('Sequence contains more than one element');
        }
        else {
            this.seenValue = true;
            this.singleValue = value;
        }
    };
    SingleSubscriber.prototype._next = function (value) {
        var index = this.index++;
        if (this.predicate) {
            this.tryNext(value, index);
        }
        else {
            this.applySingleValue(value);
        }
    };
    SingleSubscriber.prototype.tryNext = function (value, index) {
        try {
            if (this.predicate(value, index, this.source)) {
                this.applySingleValue(value);
            }
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    SingleSubscriber.prototype._complete = function () {
        var destination = this.destination;
        if (this.index > 0) {
            destination.next(this.seenValue ? this.singleValue : undefined);
            destination.complete();
        }
        else {
            destination.error(new EmptyError);
        }
    };
    return SingleSubscriber;
}(Subscriber));

/**
 * Returns an Observable that emits the single item emitted by the source Observable that matches a specified
 * predicate, if that Observable emits one such item. If the source Observable emits more than one such item or no
 * such items, notify of an IllegalArgumentException or NoSuchElementException respectively.
 *
 * <img src="./img/single.png" width="100%">
 *
 * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
 * callback if the Observable completes before any `next` notification was sent.
 * @param {Function} predicate - A predicate function to evaluate items emitted by the source Observable.
 * @return {Observable<T>} An Observable that emits the single item emitted by the source Observable that matches
 * the predicate.
 .
 * @method single
 * @owner Observable
 */
function single$$1(predicate) {
    return single$1(predicate)(this);
}

Observable.prototype.single = single$$1;

/**
 * Returns an Observable that skips the first `count` items emitted by the source Observable.
 *
 * <img src="./img/skip.png" width="100%">
 *
 * @param {Number} count - The number of times, items emitted by source Observable should be skipped.
 * @return {Observable} An Observable that skips values emitted by the source Observable.
 *
 * @method skip
 * @owner Observable
 */
function skip$1(count) {
    return function (source) { return source.lift(new SkipOperator(count)); };
}
var SkipOperator = (function () {
    function SkipOperator(total) {
        this.total = total;
    }
    SkipOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SkipSubscriber(subscriber, this.total));
    };
    return SkipOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SkipSubscriber = (function (_super) {
    __extends(SkipSubscriber, _super);
    function SkipSubscriber(destination, total) {
        _super.call(this, destination);
        this.total = total;
        this.count = 0;
    }
    SkipSubscriber.prototype._next = function (x) {
        if (++this.count > this.total) {
            this.destination.next(x);
        }
    };
    return SkipSubscriber;
}(Subscriber));

/**
 * Returns an Observable that skips the first `count` items emitted by the source Observable.
 *
 * <img src="./img/skip.png" width="100%">
 *
 * @param {Number} count - The number of times, items emitted by source Observable should be skipped.
 * @return {Observable} An Observable that skips values emitted by the source Observable.
 *
 * @method skip
 * @owner Observable
 */
function skip$$1(count) {
    return skip$1(count)(this);
}

Observable.prototype.skip = skip$$1;

/**
 * Skip the last `count` values emitted by the source Observable.
 *
 * <img src="./img/skipLast.png" width="100%">
 *
 * `skipLast` returns an Observable that accumulates a queue with a length
 * enough to store the first `count` values. As more values are received,
 * values are taken from the front of the queue and produced on the result
 * sequence. This causes values to be delayed.
 *
 * @example <caption>Skip the last 2 values of an Observable with many values</caption>
 * var many = Rx.Observable.range(1, 5);
 * var skipLastTwo = many.skipLast(2);
 * skipLastTwo.subscribe(x => console.log(x));
 *
 * // Results in:
 * // 1 2 3
 *
 * @see {@link skip}
 * @see {@link skipUntil}
 * @see {@link skipWhile}
 * @see {@link take}
 *
 * @throws {ArgumentOutOfRangeError} When using `skipLast(i)`, it throws
 * ArgumentOutOrRangeError if `i < 0`.
 *
 * @param {number} count Number of elements to skip from the end of the source Observable.
 * @returns {Observable<T>} An Observable that skips the last count values
 * emitted by the source Observable.
 * @method skipLast
 * @owner Observable
 */
function skipLast$1(count) {
    return function (source) { return source.lift(new SkipLastOperator(count)); };
}
var SkipLastOperator = (function () {
    function SkipLastOperator(_skipCount) {
        this._skipCount = _skipCount;
        if (this._skipCount < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    SkipLastOperator.prototype.call = function (subscriber, source) {
        if (this._skipCount === 0) {
            // If we don't want to skip any values then just subscribe
            // to Subscriber without any further logic.
            return source.subscribe(new Subscriber(subscriber));
        }
        else {
            return source.subscribe(new SkipLastSubscriber(subscriber, this._skipCount));
        }
    };
    return SkipLastOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SkipLastSubscriber = (function (_super) {
    __extends(SkipLastSubscriber, _super);
    function SkipLastSubscriber(destination, _skipCount) {
        _super.call(this, destination);
        this._skipCount = _skipCount;
        this._count = 0;
        this._ring = new Array(_skipCount);
    }
    SkipLastSubscriber.prototype._next = function (value) {
        var skipCount = this._skipCount;
        var count = this._count++;
        if (count < skipCount) {
            this._ring[count] = value;
        }
        else {
            var currentIndex = count % skipCount;
            var ring = this._ring;
            var oldValue = ring[currentIndex];
            ring[currentIndex] = value;
            this.destination.next(oldValue);
        }
    };
    return SkipLastSubscriber;
}(Subscriber));

/**
 * Skip the last `count` values emitted by the source Observable.
 *
 * <img src="./img/skipLast.png" width="100%">
 *
 * `skipLast` returns an Observable that accumulates a queue with a length
 * enough to store the first `count` values. As more values are received,
 * values are taken from the front of the queue and produced on the result
 * sequence. This causes values to be delayed.
 *
 * @example <caption>Skip the last 2 values of an Observable with many values</caption>
 * var many = Rx.Observable.range(1, 5);
 * var skipLastTwo = many.skipLast(2);
 * skipLastTwo.subscribe(x => console.log(x));
 *
 * // Results in:
 * // 1 2 3
 *
 * @see {@link skip}
 * @see {@link skipUntil}
 * @see {@link skipWhile}
 * @see {@link take}
 *
 * @throws {ArgumentOutOfRangeError} When using `skipLast(i)`, it throws
 * ArgumentOutOrRangeError if `i < 0`.
 *
 * @param {number} count Number of elements to skip from the end of the source Observable.
 * @returns {Observable<T>} An Observable that skips the last count values
 * emitted by the source Observable.
 * @method skipLast
 * @owner Observable
 */
function skipLast$$1(count) {
    return skipLast$1(count)(this);
}

Observable.prototype.skipLast = skipLast$$1;

/**
 * Returns an Observable that skips items emitted by the source Observable until a second Observable emits an item.
 *
 * <img src="./img/skipUntil.png" width="100%">
 *
 * @param {Observable} notifier - The second Observable that has to emit an item before the source Observable's elements begin to
 * be mirrored by the resulting Observable.
 * @return {Observable<T>} An Observable that skips items from the source Observable until the second Observable emits
 * an item, then emits the remaining items.
 * @method skipUntil
 * @owner Observable
 */
function skipUntil$1(notifier) {
    return function (source) { return source.lift(new SkipUntilOperator(notifier)); };
}
var SkipUntilOperator = (function () {
    function SkipUntilOperator(notifier) {
        this.notifier = notifier;
    }
    SkipUntilOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SkipUntilSubscriber(subscriber, this.notifier));
    };
    return SkipUntilOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SkipUntilSubscriber = (function (_super) {
    __extends(SkipUntilSubscriber, _super);
    function SkipUntilSubscriber(destination, notifier) {
        _super.call(this, destination);
        this.hasValue = false;
        this.isInnerStopped = false;
        this.add(subscribeToResult(this, notifier));
    }
    SkipUntilSubscriber.prototype._next = function (value) {
        if (this.hasValue) {
            _super.prototype._next.call(this, value);
        }
    };
    SkipUntilSubscriber.prototype._complete = function () {
        if (this.isInnerStopped) {
            _super.prototype._complete.call(this);
        }
        else {
            this.unsubscribe();
        }
    };
    SkipUntilSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.hasValue = true;
    };
    SkipUntilSubscriber.prototype.notifyComplete = function () {
        this.isInnerStopped = true;
        if (this.isStopped) {
            _super.prototype._complete.call(this);
        }
    };
    return SkipUntilSubscriber;
}(OuterSubscriber));

/**
 * Returns an Observable that skips items emitted by the source Observable until a second Observable emits an item.
 *
 * <img src="./img/skipUntil.png" width="100%">
 *
 * @param {Observable} notifier - The second Observable that has to emit an item before the source Observable's elements begin to
 * be mirrored by the resulting Observable.
 * @return {Observable<T>} An Observable that skips items from the source Observable until the second Observable emits
 * an item, then emits the remaining items.
 * @method skipUntil
 * @owner Observable
 */
function skipUntil$$1(notifier) {
    return skipUntil$1(notifier)(this);
}

Observable.prototype.skipUntil = skipUntil$$1;

/**
 * Returns an Observable that skips all items emitted by the source Observable as long as a specified condition holds
 * true, but emits all further source items as soon as the condition becomes false.
 *
 * <img src="./img/skipWhile.png" width="100%">
 *
 * @param {Function} predicate - A function to test each item emitted from the source Observable.
 * @return {Observable<T>} An Observable that begins emitting items emitted by the source Observable when the
 * specified predicate becomes false.
 * @method skipWhile
 * @owner Observable
 */
function skipWhile$1(predicate) {
    return function (source) { return source.lift(new SkipWhileOperator(predicate)); };
}
var SkipWhileOperator = (function () {
    function SkipWhileOperator(predicate) {
        this.predicate = predicate;
    }
    SkipWhileOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SkipWhileSubscriber(subscriber, this.predicate));
    };
    return SkipWhileOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SkipWhileSubscriber = (function (_super) {
    __extends(SkipWhileSubscriber, _super);
    function SkipWhileSubscriber(destination, predicate) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.skipping = true;
        this.index = 0;
    }
    SkipWhileSubscriber.prototype._next = function (value) {
        var destination = this.destination;
        if (this.skipping) {
            this.tryCallPredicate(value);
        }
        if (!this.skipping) {
            destination.next(value);
        }
    };
    SkipWhileSubscriber.prototype.tryCallPredicate = function (value) {
        try {
            var result = this.predicate(value, this.index++);
            this.skipping = Boolean(result);
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    return SkipWhileSubscriber;
}(Subscriber));

/**
 * Returns an Observable that skips all items emitted by the source Observable as long as a specified condition holds
 * true, but emits all further source items as soon as the condition becomes false.
 *
 * <img src="./img/skipWhile.png" width="100%">
 *
 * @param {Function} predicate - A function to test each item emitted from the source Observable.
 * @return {Observable<T>} An Observable that begins emitting items emitted by the source Observable when the
 * specified predicate becomes false.
 * @method skipWhile
 * @owner Observable
 */
function skipWhile$$1(predicate) {
    return skipWhile$1(predicate)(this);
}

Observable.prototype.skipWhile = skipWhile$$1;

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits the items you specify as arguments before it begins to emit
 * items emitted by the source Observable.
 *
 * <img src="./img/startWith.png" width="100%">
 *
 * @param {...T} values - Items you want the modified Observable to emit first.
 * @param {Scheduler} [scheduler] - A {@link IScheduler} to use for scheduling
 * the emissions of the `next` notifications.
 * @return {Observable} An Observable that emits the items in the specified Iterable and then emits the items
 * emitted by the source Observable.
 * @method startWith
 * @owner Observable
 */
function startWith$1() {
    var array = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        array[_i - 0] = arguments[_i];
    }
    return function (source) {
        var scheduler = array[array.length - 1];
        if (isScheduler(scheduler)) {
            array.pop();
        }
        else {
            scheduler = null;
        }
        var len = array.length;
        if (len === 1) {
            return concat(new ScalarObservable(array[0], scheduler), source);
        }
        else if (len > 1) {
            return concat(new ArrayObservable(array, scheduler), source);
        }
        else {
            return concat(new EmptyObservable(scheduler), source);
        }
    };
}

/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits the items you specify as arguments before it begins to emit
 * items emitted by the source Observable.
 *
 * <img src="./img/startWith.png" width="100%">
 *
 * @param {...T} values - Items you want the modified Observable to emit first.
 * @param {Scheduler} [scheduler] - A {@link IScheduler} to use for scheduling
 * the emissions of the `next` notifications.
 * @return {Observable} An Observable that emits the items in the specified Iterable and then emits the items
 * emitted by the source Observable.
 * @method startWith
 * @owner Observable
 */
function startWith$$1() {
    var array = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        array[_i - 0] = arguments[_i];
    }
    return startWith$1.apply(void 0, array)(this);
}

Observable.prototype.startWith = startWith$$1;

/**
Some credit for this helper goes to http://github.com/YuzuJS/setImmediate
*/
var ImmediateDefinition = (function () {
    function ImmediateDefinition(root$$1) {
        this.root = root$$1;
        if (root$$1.setImmediate && typeof root$$1.setImmediate === 'function') {
            this.setImmediate = root$$1.setImmediate.bind(root$$1);
            this.clearImmediate = root$$1.clearImmediate.bind(root$$1);
        }
        else {
            this.nextHandle = 1;
            this.tasksByHandle = {};
            this.currentlyRunningATask = false;
            // Don't get fooled by e.g. browserify environments.
            if (this.canUseProcessNextTick()) {
                // For Node.js before 0.9
                this.setImmediate = this.createProcessNextTickSetImmediate();
            }
            else if (this.canUsePostMessage()) {
                // For non-IE10 modern browsers
                this.setImmediate = this.createPostMessageSetImmediate();
            }
            else if (this.canUseMessageChannel()) {
                // For web workers, where supported
                this.setImmediate = this.createMessageChannelSetImmediate();
            }
            else if (this.canUseReadyStateChange()) {
                // For IE 6–8
                this.setImmediate = this.createReadyStateChangeSetImmediate();
            }
            else {
                // For older browsers
                this.setImmediate = this.createSetTimeoutSetImmediate();
            }
            var ci = function clearImmediate(handle) {
                delete clearImmediate.instance.tasksByHandle[handle];
            };
            ci.instance = this;
            this.clearImmediate = ci;
        }
    }
    ImmediateDefinition.prototype.identify = function (o) {
        return this.root.Object.prototype.toString.call(o);
    };
    ImmediateDefinition.prototype.canUseProcessNextTick = function () {
        return this.identify(this.root.process) === '[object process]';
    };
    ImmediateDefinition.prototype.canUseMessageChannel = function () {
        return Boolean(this.root.MessageChannel);
    };
    ImmediateDefinition.prototype.canUseReadyStateChange = function () {
        var document = this.root.document;
        return Boolean(document && 'onreadystatechange' in document.createElement('script'));
    };
    ImmediateDefinition.prototype.canUsePostMessage = function () {
        var root$$1 = this.root;
        // The test against `importScripts` prevents this implementation from being installed inside a web worker,
        // where `root.postMessage` means something completely different and can't be used for this purpose.
        if (root$$1.postMessage && !root$$1.importScripts) {
            var postMessageIsAsynchronous_1 = true;
            var oldOnMessage = root$$1.onmessage;
            root$$1.onmessage = function () {
                postMessageIsAsynchronous_1 = false;
            };
            root$$1.postMessage('', '*');
            root$$1.onmessage = oldOnMessage;
            return postMessageIsAsynchronous_1;
        }
        return false;
    };
    // This function accepts the same arguments as setImmediate, but
    // returns a function that requires no arguments.
    ImmediateDefinition.prototype.partiallyApplied = function (handler) {
        var args = [];
        for (var _i = 1; _i < arguments.length; _i++) {
            args[_i - 1] = arguments[_i];
        }
        var fn = function result() {
            var _a = result, handler = _a.handler, args = _a.args;
            if (typeof handler === 'function') {
                handler.apply(undefined, args);
            }
            else {
                (new Function('' + handler))();
            }
        };
        fn.handler = handler;
        fn.args = args;
        return fn;
    };
    ImmediateDefinition.prototype.addFromSetImmediateArguments = function (args) {
        this.tasksByHandle[this.nextHandle] = this.partiallyApplied.apply(undefined, args);
        return this.nextHandle++;
    };
    ImmediateDefinition.prototype.createProcessNextTickSetImmediate = function () {
        var fn = function setImmediate() {
            var instance = setImmediate.instance;
            var handle = instance.addFromSetImmediateArguments(arguments);
            instance.root.process.nextTick(instance.partiallyApplied(instance.runIfPresent, handle));
            return handle;
        };
        fn.instance = this;
        return fn;
    };
    ImmediateDefinition.prototype.createPostMessageSetImmediate = function () {
        // Installs an event handler on `global` for the `message` event: see
        // * https://developer.mozilla.org/en/DOM/window.postMessage
        // * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages
        var root$$1 = this.root;
        var messagePrefix = 'setImmediate$' + root$$1.Math.random() + '$';
        var onGlobalMessage = function globalMessageHandler(event) {
            var instance = globalMessageHandler.instance;
            if (event.source === root$$1 &&
                typeof event.data === 'string' &&
                event.data.indexOf(messagePrefix) === 0) {
                instance.runIfPresent(+event.data.slice(messagePrefix.length));
            }
        };
        onGlobalMessage.instance = this;
        root$$1.addEventListener('message', onGlobalMessage, false);
        var fn = function setImmediate() {
            var _a = setImmediate, messagePrefix = _a.messagePrefix, instance = _a.instance;
            var handle = instance.addFromSetImmediateArguments(arguments);
            instance.root.postMessage(messagePrefix + handle, '*');
            return handle;
        };
        fn.instance = this;
        fn.messagePrefix = messagePrefix;
        return fn;
    };
    ImmediateDefinition.prototype.runIfPresent = function (handle) {
        // From the spec: 'Wait until any invocations of this algorithm started before this one have completed.'
        // So if we're currently running a task, we'll need to delay this invocation.
        if (this.currentlyRunningATask) {
            // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
            // 'too much recursion' error.
            this.root.setTimeout(this.partiallyApplied(this.runIfPresent, handle), 0);
        }
        else {
            var task = this.tasksByHandle[handle];
            if (task) {
                this.currentlyRunningATask = true;
                try {
                    task();
                }
                finally {
                    this.clearImmediate(handle);
                    this.currentlyRunningATask = false;
                }
            }
        }
    };
    ImmediateDefinition.prototype.createMessageChannelSetImmediate = function () {
        var _this = this;
        var channel = new this.root.MessageChannel();
        channel.port1.onmessage = function (event) {
            var handle = event.data;
            _this.runIfPresent(handle);
        };
        var fn = function setImmediate() {
            var _a = setImmediate, channel = _a.channel, instance = _a.instance;
            var handle = instance.addFromSetImmediateArguments(arguments);
            channel.port2.postMessage(handle);
            return handle;
        };
        fn.channel = channel;
        fn.instance = this;
        return fn;
    };
    ImmediateDefinition.prototype.createReadyStateChangeSetImmediate = function () {
        var fn = function setImmediate() {
            var instance = setImmediate.instance;
            var root$$1 = instance.root;
            var doc = root$$1.document;
            var html = doc.documentElement;
            var handle = instance.addFromSetImmediateArguments(arguments);
            // Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
            // into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
            var script = doc.createElement('script');
            script.onreadystatechange = function () {
                instance.runIfPresent(handle);
                script.onreadystatechange = null;
                html.removeChild(script);
                script = null;
            };
            html.appendChild(script);
            return handle;
        };
        fn.instance = this;
        return fn;
    };
    ImmediateDefinition.prototype.createSetTimeoutSetImmediate = function () {
        var fn = function setImmediate() {
            var instance = setImmediate.instance;
            var handle = instance.addFromSetImmediateArguments(arguments);
            instance.root.setTimeout(instance.partiallyApplied(instance.runIfPresent, handle), 0);
            return handle;
        };
        fn.instance = this;
        return fn;
    };
    return ImmediateDefinition;
}());
var Immediate = new ImmediateDefinition(_root);

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var AsapAction = (function (_super) {
    __extends(AsapAction, _super);
    function AsapAction(scheduler, work) {
        _super.call(this, scheduler, work);
        this.scheduler = scheduler;
        this.work = work;
    }
    AsapAction.prototype.requestAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        // If delay is greater than 0, request as an async action.
        if (delay !== null && delay > 0) {
            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);
        }
        // Push the action to the end of the scheduler queue.
        scheduler.actions.push(this);
        // If a microtask has already been scheduled, don't schedule another
        // one. If a microtask hasn't been scheduled yet, schedule one now. Return
        // the current scheduled microtask id.
        return scheduler.scheduled || (scheduler.scheduled = Immediate.setImmediate(scheduler.flush.bind(scheduler, null)));
    };
    AsapAction.prototype.recycleAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        // If delay exists and is greater than 0, or if the delay is null (the
        // action wasn't rescheduled) but was originally scheduled as an async
        // action, then recycle as an async action.
        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {
            return _super.prototype.recycleAsyncId.call(this, scheduler, id, delay);
        }
        // If the scheduler queue is empty, cancel the requested microtask and
        // set the scheduled flag to undefined so the next AsapAction will schedule
        // its own.
        if (scheduler.actions.length === 0) {
            Immediate.clearImmediate(id);
            scheduler.scheduled = undefined;
        }
        // Return undefined so the action knows to request a new async id if it's rescheduled.
        return undefined;
    };
    return AsapAction;
}(AsyncAction));

var AsapScheduler = (function (_super) {
    __extends(AsapScheduler, _super);
    function AsapScheduler() {
        _super.apply(this, arguments);
    }
    AsapScheduler.prototype.flush = function (action) {
        this.active = true;
        this.scheduled = undefined;
        var actions = this.actions;
        var error;
        var index = -1;
        var count = actions.length;
        action = action || actions.shift();
        do {
            if (error = action.execute(action.state, action.delay)) {
                break;
            }
        } while (++index < count && (action = actions.shift()));
        this.active = false;
        if (error) {
            while (++index < count && (action = actions.shift())) {
                action.unsubscribe();
            }
            throw error;
        }
    };
    return AsapScheduler;
}(AsyncScheduler));

/**
 *
 * Asap Scheduler
 *
 * <span class="informal">Perform task as fast as it can be performed asynchronously</span>
 *
 * `asap` scheduler behaves the same as {@link async} scheduler when you use it to delay task
 * in time. If however you set delay to `0`, `asap` will wait for current synchronously executing
 * code to end and then it will try to execute given task as fast as possible.
 *
 * `asap` scheduler will do its best to minimize time between end of currently executing code
 * and start of scheduled task. This makes it best candidate for performing so called "deferring".
 * Traditionally this was achieved by calling `setTimeout(deferredTask, 0)`, but that technique involves
 * some (although minimal) unwanted delay.
 *
 * Note that using `asap` scheduler does not necessarily mean that your task will be first to process
 * after currently executing code. In particular, if some task was also scheduled with `asap` before,
 * that task will execute first. That being said, if you need to schedule task asynchronously, but
 * as soon as possible, `asap` scheduler is your best bet.
 *
 * @example <caption>Compare async and asap scheduler</caption>
 *
 * Rx.Scheduler.async.schedule(() => console.log('async')); // scheduling 'async' first...
 * Rx.Scheduler.asap.schedule(() => console.log('asap'));
 *
 * // Logs:
 * // "asap"
 * // "async"
 * // ... but 'asap' goes first!
 *
 * @static true
 * @name asap
 * @owner Scheduler
 */
var asap = new AsapScheduler(AsapAction);

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
var SubscribeOnObservable = (function (_super) {
    __extends(SubscribeOnObservable, _super);
    function SubscribeOnObservable(source, delayTime, scheduler) {
        if (delayTime === void 0) { delayTime = 0; }
        if (scheduler === void 0) { scheduler = asap; }
        _super.call(this);
        this.source = source;
        this.delayTime = delayTime;
        this.scheduler = scheduler;
        if (!isNumeric(delayTime) || delayTime < 0) {
            this.delayTime = 0;
        }
        if (!scheduler || typeof scheduler.schedule !== 'function') {
            this.scheduler = asap;
        }
    }
    SubscribeOnObservable.create = function (source, delay, scheduler) {
        if (delay === void 0) { delay = 0; }
        if (scheduler === void 0) { scheduler = asap; }
        return new SubscribeOnObservable(source, delay, scheduler);
    };
    SubscribeOnObservable.dispatch = function (arg) {
        var source = arg.source, subscriber = arg.subscriber;
        return this.add(source.subscribe(subscriber));
    };
    /** @deprecated internal use only */ SubscribeOnObservable.prototype._subscribe = function (subscriber) {
        var delay = this.delayTime;
        var source = this.source;
        var scheduler = this.scheduler;
        return scheduler.schedule(SubscribeOnObservable.dispatch, delay, {
            source: source, subscriber: subscriber
        });
    };
    return SubscribeOnObservable;
}(Observable));

/**
 * Asynchronously subscribes Observers to this Observable on the specified IScheduler.
 *
 * <img src="./img/subscribeOn.png" width="100%">
 *
 * @param {Scheduler} scheduler - The IScheduler to perform subscription actions on.
 * @return {Observable<T>} The source Observable modified so that its subscriptions happen on the specified IScheduler.
 .
 * @method subscribeOn
 * @owner Observable
 */
function subscribeOn$1(scheduler, delay) {
    if (delay === void 0) { delay = 0; }
    return function subscribeOnOperatorFunction(source) {
        return source.lift(new SubscribeOnOperator(scheduler, delay));
    };
}
var SubscribeOnOperator = (function () {
    function SubscribeOnOperator(scheduler, delay) {
        this.scheduler = scheduler;
        this.delay = delay;
    }
    SubscribeOnOperator.prototype.call = function (subscriber, source) {
        return new SubscribeOnObservable(source, this.delay, this.scheduler).subscribe(subscriber);
    };
    return SubscribeOnOperator;
}());

/**
 * Asynchronously subscribes Observers to this Observable on the specified IScheduler.
 *
 * <img src="./img/subscribeOn.png" width="100%">
 *
 * @param {Scheduler} scheduler - The IScheduler to perform subscription actions on.
 * @return {Observable<T>} The source Observable modified so that its subscriptions happen on the specified IScheduler.
 .
 * @method subscribeOn
 * @owner Observable
 */
function subscribeOn$$1(scheduler, delay) {
    if (delay === void 0) { delay = 0; }
    return subscribeOn$1(scheduler, delay)(this);
}

Observable.prototype.subscribeOn = subscribeOn$$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable, emitting values only from the most recently projected Observable.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link switch}.</span>
 *
 * <img src="./img/switchMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. Each time it observes one of these
 * inner Observables, the output Observable begins emitting the items emitted by
 * that inner Observable. When a new inner Observable is emitted, `switchMap`
 * stops emitting items from the earlier-emitted inner Observable and begins
 * emitting items from the new one. It continues to behave like this for
 * subsequent inner Observables.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.switchMap((ev) => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMap}
 * @see {@link exhaustMap}
 * @see {@link mergeMap}
 * @see {@link switch}
 * @see {@link switchMapTo}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and taking only the values from the most recently
 * projected inner Observable.
 * @method switchMap
 * @owner Observable
 */
function switchMap(project, resultSelector) {
    return function switchMapOperatorFunction(source) {
        return source.lift(new SwitchMapOperator(project, resultSelector));
    };
}
var SwitchMapOperator = (function () {
    function SwitchMapOperator(project, resultSelector) {
        this.project = project;
        this.resultSelector = resultSelector;
    }
    SwitchMapOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SwitchMapSubscriber(subscriber, this.project, this.resultSelector));
    };
    return SwitchMapOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SwitchMapSubscriber = (function (_super) {
    __extends(SwitchMapSubscriber, _super);
    function SwitchMapSubscriber(destination, project, resultSelector) {
        _super.call(this, destination);
        this.project = project;
        this.resultSelector = resultSelector;
        this.index = 0;
    }
    SwitchMapSubscriber.prototype._next = function (value) {
        var result;
        var index = this.index++;
        try {
            result = this.project(value, index);
        }
        catch (error) {
            this.destination.error(error);
            return;
        }
        this._innerSub(result, value, index);
    };
    SwitchMapSubscriber.prototype._innerSub = function (result, value, index) {
        var innerSubscription = this.innerSubscription;
        if (innerSubscription) {
            innerSubscription.unsubscribe();
        }
        this.add(this.innerSubscription = subscribeToResult(this, result, value, index));
    };
    SwitchMapSubscriber.prototype._complete = function () {
        var innerSubscription = this.innerSubscription;
        if (!innerSubscription || innerSubscription.closed) {
            _super.prototype._complete.call(this);
        }
    };
    /** @deprecated internal use only */ SwitchMapSubscriber.prototype._unsubscribe = function () {
        this.innerSubscription = null;
    };
    SwitchMapSubscriber.prototype.notifyComplete = function (innerSub) {
        this.remove(innerSub);
        this.innerSubscription = null;
        if (this.isStopped) {
            _super.prototype._complete.call(this);
        }
    };
    SwitchMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        if (this.resultSelector) {
            this._tryNotifyNext(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            this.destination.next(innerValue);
        }
    };
    SwitchMapSubscriber.prototype._tryNotifyNext = function (outerValue, innerValue, outerIndex, innerIndex) {
        var result;
        try {
            result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return SwitchMapSubscriber;
}(OuterSubscriber));

function switchAll() {
    return switchMap(identity);
}

/**
 * Converts a higher-order Observable into a first-order Observable by
 * subscribing to only the most recently emitted of those inner Observables.
 *
 * <span class="informal">Flattens an Observable-of-Observables by dropping the
 * previous inner Observable once a new one appears.</span>
 *
 * <img src="./img/switch.png" width="100%">
 *
 * `switch` subscribes to an Observable that emits Observables, also known as a
 * higher-order Observable. Each time it observes one of these emitted inner
 * Observables, the output Observable subscribes to the inner Observable and
 * begins emitting the items emitted by that. So far, it behaves
 * like {@link mergeAll}. However, when a new inner Observable is emitted,
 * `switch` unsubscribes from the earlier-emitted inner Observable and
 * subscribes to the new inner Observable and begins emitting items from it. It
 * continues to behave like this for subsequent inner Observables.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * // Each click event is mapped to an Observable that ticks every second
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
 * var switched = higherOrder.switch();
 * // The outcome is that `switched` is essentially a timer that restarts
 * // on every click. The interval Observables from older clicks do not merge
 * // with the current interval Observable.
 * switched.subscribe(x => console.log(x));
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link exhaust}
 * @see {@link mergeAll}
 * @see {@link switchMap}
 * @see {@link switchMapTo}
 * @see {@link zipAll}
 *
 * @return {Observable<T>} An Observable that emits the items emitted by the
 * Observable most recently emitted by the source Observable.
 * @method switch
 * @name switch
 * @owner Observable
 */
function _switch() {
    return switchAll()(this);
}

Observable.prototype.switch = _switch;
Observable.prototype._switch = _switch;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable, emitting values only from the most recently projected Observable.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link switch}.</span>
 *
 * <img src="./img/switchMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. Each time it observes one of these
 * inner Observables, the output Observable begins emitting the items emitted by
 * that inner Observable. When a new inner Observable is emitted, `switchMap`
 * stops emitting items from the earlier-emitted inner Observable and begins
 * emitting items from the new one. It continues to behave like this for
 * subsequent inner Observables.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.switchMap((ev) => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMap}
 * @see {@link exhaustMap}
 * @see {@link mergeMap}
 * @see {@link switch}
 * @see {@link switchMapTo}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and taking only the values from the most recently
 * projected inner Observable.
 * @method switchMap
 * @owner Observable
 */
function switchMap$1(project, resultSelector) {
    return switchMap(project, resultSelector)(this);
}

Observable.prototype.switchMap = switchMap$1;

/* tslint:enable:max-line-length */
/**
 * Projects each source value to the same Observable which is flattened multiple
 * times with {@link switch} in the output Observable.
 *
 * <span class="informal">It's like {@link switchMap}, but maps each value
 * always to the same inner Observable.</span>
 *
 * <img src="./img/switchMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then flattens those resulting Observables into one
 * single Observable, which is the output Observable. The output Observables
 * emits values only from the most recently emitted instance of
 * `innerObservable`.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.switchMapTo(Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMapTo}
 * @see {@link switch}
 * @see {@link switchMap}
 * @see {@link mergeMapTo}
 *
 * @param {ObservableInput} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits items from the given
 * `innerObservable` (and optionally transformed through `resultSelector`) every
 * time a value is emitted on the source Observable, and taking only the values
 * from the most recently projected inner Observable.
 * @method switchMapTo
 * @owner Observable
 */
function switchMapTo$1(innerObservable, resultSelector) {
    return function (source) { return source.lift(new SwitchMapToOperator(innerObservable, resultSelector)); };
}
var SwitchMapToOperator = (function () {
    function SwitchMapToOperator(observable, resultSelector) {
        this.observable = observable;
        this.resultSelector = resultSelector;
    }
    SwitchMapToOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SwitchMapToSubscriber(subscriber, this.observable, this.resultSelector));
    };
    return SwitchMapToOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SwitchMapToSubscriber = (function (_super) {
    __extends(SwitchMapToSubscriber, _super);
    function SwitchMapToSubscriber(destination, inner, resultSelector) {
        _super.call(this, destination);
        this.inner = inner;
        this.resultSelector = resultSelector;
        this.index = 0;
    }
    SwitchMapToSubscriber.prototype._next = function (value) {
        var innerSubscription = this.innerSubscription;
        if (innerSubscription) {
            innerSubscription.unsubscribe();
        }
        this.add(this.innerSubscription = subscribeToResult(this, this.inner, value, this.index++));
    };
    SwitchMapToSubscriber.prototype._complete = function () {
        var innerSubscription = this.innerSubscription;
        if (!innerSubscription || innerSubscription.closed) {
            _super.prototype._complete.call(this);
        }
    };
    /** @deprecated internal use only */ SwitchMapToSubscriber.prototype._unsubscribe = function () {
        this.innerSubscription = null;
    };
    SwitchMapToSubscriber.prototype.notifyComplete = function (innerSub) {
        this.remove(innerSub);
        this.innerSubscription = null;
        if (this.isStopped) {
            _super.prototype._complete.call(this);
        }
    };
    SwitchMapToSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        if (resultSelector) {
            this.tryResultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            destination.next(innerValue);
        }
    };
    SwitchMapToSubscriber.prototype.tryResultSelector = function (outerValue, innerValue, outerIndex, innerIndex) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        var result;
        try {
            result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        catch (err) {
            destination.error(err);
            return;
        }
        destination.next(result);
    };
    return SwitchMapToSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 * Projects each source value to the same Observable which is flattened multiple
 * times with {@link switch} in the output Observable.
 *
 * <span class="informal">It's like {@link switchMap}, but maps each value
 * always to the same inner Observable.</span>
 *
 * <img src="./img/switchMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then flattens those resulting Observables into one
 * single Observable, which is the output Observable. The output Observables
 * emits values only from the most recently emitted instance of
 * `innerObservable`.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.switchMapTo(Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMapTo}
 * @see {@link switch}
 * @see {@link switchMap}
 * @see {@link mergeMapTo}
 *
 * @param {ObservableInput} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits items from the given
 * `innerObservable` (and optionally transformed through `resultSelector`) every
 * time a value is emitted on the source Observable, and taking only the values
 * from the most recently projected inner Observable.
 * @method switchMapTo
 * @owner Observable
 */
function switchMapTo$$1(innerObservable, resultSelector) {
    return switchMapTo$1(innerObservable, resultSelector)(this);
}

Observable.prototype.switchMapTo = switchMapTo$$1;

/**
 * Emits only the first `count` values emitted by the source Observable.
 *
 * <span class="informal">Takes the first `count` values from the source, then
 * completes.</span>
 *
 * <img src="./img/take.png" width="100%">
 *
 * `take` returns an Observable that emits only the first `count` values emitted
 * by the source Observable. If the source emits fewer than `count` values then
 * all of its values are emitted. After that, it completes, regardless if the
 * source completes.
 *
 * @example <caption>Take the first 5 seconds of an infinite 1-second interval Observable</caption>
 * var interval = Rx.Observable.interval(1000);
 * var five = interval.take(5);
 * five.subscribe(x => console.log(x));
 *
 * @see {@link takeLast}
 * @see {@link takeUntil}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @throws {ArgumentOutOfRangeError} When using `take(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
 *
 * @param {number} count The maximum number of `next` values to emit.
 * @return {Observable<T>} An Observable that emits only the first `count`
 * values emitted by the source Observable, or all of the values from the source
 * if the source emits fewer than `count` values.
 * @method take
 * @owner Observable
 */
function take$1(count) {
    return function (source) {
        if (count === 0) {
            return new EmptyObservable();
        }
        else {
            return source.lift(new TakeOperator(count));
        }
    };
}
var TakeOperator = (function () {
    function TakeOperator(total) {
        this.total = total;
        if (this.total < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    TakeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TakeSubscriber(subscriber, this.total));
    };
    return TakeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TakeSubscriber = (function (_super) {
    __extends(TakeSubscriber, _super);
    function TakeSubscriber(destination, total) {
        _super.call(this, destination);
        this.total = total;
        this.count = 0;
    }
    TakeSubscriber.prototype._next = function (value) {
        var total = this.total;
        var count = ++this.count;
        if (count <= total) {
            this.destination.next(value);
            if (count === total) {
                this.destination.complete();
                this.unsubscribe();
            }
        }
    };
    return TakeSubscriber;
}(Subscriber));

/**
 * Emits only the first `count` values emitted by the source Observable.
 *
 * <span class="informal">Takes the first `count` values from the source, then
 * completes.</span>
 *
 * <img src="./img/take.png" width="100%">
 *
 * `take` returns an Observable that emits only the first `count` values emitted
 * by the source Observable. If the source emits fewer than `count` values then
 * all of its values are emitted. After that, it completes, regardless if the
 * source completes.
 *
 * @example <caption>Take the first 5 seconds of an infinite 1-second interval Observable</caption>
 * var interval = Rx.Observable.interval(1000);
 * var five = interval.take(5);
 * five.subscribe(x => console.log(x));
 *
 * @see {@link takeLast}
 * @see {@link takeUntil}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @throws {ArgumentOutOfRangeError} When using `take(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
 *
 * @param {number} count The maximum number of `next` values to emit.
 * @return {Observable<T>} An Observable that emits only the first `count`
 * values emitted by the source Observable, or all of the values from the source
 * if the source emits fewer than `count` values.
 * @method take
 * @owner Observable
 */
function take$$1(count) {
    return take$1(count)(this);
}

Observable.prototype.take = take$$1;

/**
 * Emits only the last `count` values emitted by the source Observable.
 *
 * <span class="informal">Remembers the latest `count` values, then emits those
 * only when the source completes.</span>
 *
 * <img src="./img/takeLast.png" width="100%">
 *
 * `takeLast` returns an Observable that emits at most the last `count` values
 * emitted by the source Observable. If the source emits fewer than `count`
 * values then all of its values are emitted. This operator must wait until the
 * `complete` notification emission from the source in order to emit the `next`
 * values on the output Observable, because otherwise it is impossible to know
 * whether or not more values will be emitted on the source. For this reason,
 * all values are emitted synchronously, followed by the complete notification.
 *
 * @example <caption>Take the last 3 values of an Observable with many values</caption>
 * var many = Rx.Observable.range(1, 100);
 * var lastThree = many.takeLast(3);
 * lastThree.subscribe(x => console.log(x));
 *
 * @see {@link take}
 * @see {@link takeUntil}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @throws {ArgumentOutOfRangeError} When using `takeLast(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
 *
 * @param {number} count The maximum number of values to emit from the end of
 * the sequence of values emitted by the source Observable.
 * @return {Observable<T>} An Observable that emits at most the last count
 * values emitted by the source Observable.
 * @method takeLast
 * @owner Observable
 */
function takeLast$1(count) {
    return takeLast(count)(this);
}

Observable.prototype.takeLast = takeLast$1;

/**
 * Emits the values emitted by the source Observable until a `notifier`
 * Observable emits a value.
 *
 * <span class="informal">Lets values pass until a second Observable,
 * `notifier`, emits something. Then, it completes.</span>
 *
 * <img src="./img/takeUntil.png" width="100%">
 *
 * `takeUntil` subscribes and begins mirroring the source Observable. It also
 * monitors a second Observable, `notifier` that you provide. If the `notifier`
 * emits a value or a complete notification, the output Observable stops
 * mirroring the source Observable and completes.
 *
 * @example <caption>Tick every second until the first click happens</caption>
 * var interval = Rx.Observable.interval(1000);
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = interval.takeUntil(clicks);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link take}
 * @see {@link takeLast}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @param {Observable} notifier The Observable whose first emitted value will
 * cause the output Observable of `takeUntil` to stop emitting values from the
 * source Observable.
 * @return {Observable<T>} An Observable that emits the values from the source
 * Observable until such time as `notifier` emits its first value.
 * @method takeUntil
 * @owner Observable
 */
function takeUntil$1(notifier) {
    return function (source) { return source.lift(new TakeUntilOperator(notifier)); };
}
var TakeUntilOperator = (function () {
    function TakeUntilOperator(notifier) {
        this.notifier = notifier;
    }
    TakeUntilOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TakeUntilSubscriber(subscriber, this.notifier));
    };
    return TakeUntilOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TakeUntilSubscriber = (function (_super) {
    __extends(TakeUntilSubscriber, _super);
    function TakeUntilSubscriber(destination, notifier) {
        _super.call(this, destination);
        this.notifier = notifier;
        this.add(subscribeToResult(this, notifier));
    }
    TakeUntilSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.complete();
    };
    TakeUntilSubscriber.prototype.notifyComplete = function () {
        // noop
    };
    return TakeUntilSubscriber;
}(OuterSubscriber));

/**
 * Emits the values emitted by the source Observable until a `notifier`
 * Observable emits a value.
 *
 * <span class="informal">Lets values pass until a second Observable,
 * `notifier`, emits something. Then, it completes.</span>
 *
 * <img src="./img/takeUntil.png" width="100%">
 *
 * `takeUntil` subscribes and begins mirroring the source Observable. It also
 * monitors a second Observable, `notifier` that you provide. If the `notifier`
 * emits a value, the output Observable stops mirroring the source Observable
 * and completes.
 *
 * @example <caption>Tick every second until the first click happens</caption>
 * var interval = Rx.Observable.interval(1000);
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = interval.takeUntil(clicks);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link take}
 * @see {@link takeLast}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @param {Observable} notifier The Observable whose first emitted value will
 * cause the output Observable of `takeUntil` to stop emitting values from the
 * source Observable.
 * @return {Observable<T>} An Observable that emits the values from the source
 * Observable until such time as `notifier` emits its first value.
 * @method takeUntil
 * @owner Observable
 */
function takeUntil$$1(notifier) {
    return takeUntil$1(notifier)(this);
}

Observable.prototype.takeUntil = takeUntil$$1;

/**
 * Emits values emitted by the source Observable so long as each value satisfies
 * the given `predicate`, and then completes as soon as this `predicate` is not
 * satisfied.
 *
 * <span class="informal">Takes values from the source only while they pass the
 * condition given. When the first value does not satisfy, it completes.</span>
 *
 * <img src="./img/takeWhile.png" width="100%">
 *
 * `takeWhile` subscribes and begins mirroring the source Observable. Each value
 * emitted on the source is given to the `predicate` function which returns a
 * boolean, representing a condition to be satisfied by the source values. The
 * output Observable emits the source values until such time as the `predicate`
 * returns false, at which point `takeWhile` stops mirroring the source
 * Observable and completes the output Observable.
 *
 * @example <caption>Emit click events only while the clientX property is greater than 200</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.takeWhile(ev => ev.clientX > 200);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link take}
 * @see {@link takeLast}
 * @see {@link takeUntil}
 * @see {@link skip}
 *
 * @param {function(value: T, index: number): boolean} predicate A function that
 * evaluates a value emitted by the source Observable and returns a boolean.
 * Also takes the (zero-based) index as the second argument.
 * @return {Observable<T>} An Observable that emits the values from the source
 * Observable so long as each value satisfies the condition defined by the
 * `predicate`, then completes.
 * @method takeWhile
 * @owner Observable
 */
function takeWhile$1(predicate) {
    return function (source) { return source.lift(new TakeWhileOperator(predicate)); };
}
var TakeWhileOperator = (function () {
    function TakeWhileOperator(predicate) {
        this.predicate = predicate;
    }
    TakeWhileOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TakeWhileSubscriber(subscriber, this.predicate));
    };
    return TakeWhileOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TakeWhileSubscriber = (function (_super) {
    __extends(TakeWhileSubscriber, _super);
    function TakeWhileSubscriber(destination, predicate) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.index = 0;
    }
    TakeWhileSubscriber.prototype._next = function (value) {
        var destination = this.destination;
        var result;
        try {
            result = this.predicate(value, this.index++);
        }
        catch (err) {
            destination.error(err);
            return;
        }
        this.nextOrComplete(value, result);
    };
    TakeWhileSubscriber.prototype.nextOrComplete = function (value, predicateResult) {
        var destination = this.destination;
        if (Boolean(predicateResult)) {
            destination.next(value);
        }
        else {
            destination.complete();
        }
    };
    return TakeWhileSubscriber;
}(Subscriber));

/**
 * Emits values emitted by the source Observable so long as each value satisfies
 * the given `predicate`, and then completes as soon as this `predicate` is not
 * satisfied.
 *
 * <span class="informal">Takes values from the source only while they pass the
 * condition given. When the first value does not satisfy, it completes.</span>
 *
 * <img src="./img/takeWhile.png" width="100%">
 *
 * `takeWhile` subscribes and begins mirroring the source Observable. Each value
 * emitted on the source is given to the `predicate` function which returns a
 * boolean, representing a condition to be satisfied by the source values. The
 * output Observable emits the source values until such time as the `predicate`
 * returns false, at which point `takeWhile` stops mirroring the source
 * Observable and completes the output Observable.
 *
 * @example <caption>Emit click events only while the clientX property is greater than 200</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.takeWhile(ev => ev.clientX > 200);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link take}
 * @see {@link takeLast}
 * @see {@link takeUntil}
 * @see {@link skip}
 *
 * @param {function(value: T, index: number): boolean} predicate A function that
 * evaluates a value emitted by the source Observable and returns a boolean.
 * Also takes the (zero-based) index as the second argument.
 * @return {Observable<T>} An Observable that emits the values from the source
 * Observable so long as each value satisfies the condition defined by the
 * `predicate`, then completes.
 * @method takeWhile
 * @owner Observable
 */
function takeWhile$$1(predicate) {
    return takeWhile$1(predicate)(this);
}

Observable.prototype.takeWhile = takeWhile$$1;

var defaultThrottleConfig = {
    leading: true,
    trailing: false
};
/**
 * Emits a value from the source Observable, then ignores subsequent source
 * values for a duration determined by another Observable, then repeats this
 * process.
 *
 * <span class="informal">It's like {@link throttleTime}, but the silencing
 * duration is determined by a second Observable.</span>
 *
 * <img src="./img/throttle.png" width="100%">
 *
 * `throttle` emits the source Observable values on the output Observable
 * when its internal timer is disabled, and ignores source values when the timer
 * is enabled. Initially, the timer is disabled. As soon as the first source
 * value arrives, it is forwarded to the output Observable, and then the timer
 * is enabled by calling the `durationSelector` function with the source value,
 * which returns the "duration" Observable. When the duration Observable emits a
 * value or completes, the timer is disabled, and this process repeats for the
 * next source value.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.throttle(ev => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounce}
 * @see {@link delayWhen}
 * @see {@link sample}
 * @see {@link throttleTime}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the silencing
 * duration for each source value, returned as an Observable or a Promise.
 * @param {Object} config a configuration object to define `leading` and `trailing` behavior. Defaults
 * to `{ leading: true, trailing: false }`.
 * @return {Observable<T>} An Observable that performs the throttle operation to
 * limit the rate of emissions from the source.
 * @method throttle
 * @owner Observable
 */
function throttle$1(durationSelector, config) {
    if (config === void 0) { config = defaultThrottleConfig; }
    return function (source) { return source.lift(new ThrottleOperator(durationSelector, config.leading, config.trailing)); };
}
var ThrottleOperator = (function () {
    function ThrottleOperator(durationSelector, leading, trailing) {
        this.durationSelector = durationSelector;
        this.leading = leading;
        this.trailing = trailing;
    }
    ThrottleOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ThrottleSubscriber(subscriber, this.durationSelector, this.leading, this.trailing));
    };
    return ThrottleOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc
 * @ignore
 * @extends {Ignored}
 */
var ThrottleSubscriber = (function (_super) {
    __extends(ThrottleSubscriber, _super);
    function ThrottleSubscriber(destination, durationSelector, _leading, _trailing) {
        _super.call(this, destination);
        this.destination = destination;
        this.durationSelector = durationSelector;
        this._leading = _leading;
        this._trailing = _trailing;
        this._hasTrailingValue = false;
    }
    ThrottleSubscriber.prototype._next = function (value) {
        if (this.throttled) {
            if (this._trailing) {
                this._hasTrailingValue = true;
                this._trailingValue = value;
            }
        }
        else {
            var duration = this.tryDurationSelector(value);
            if (duration) {
                this.add(this.throttled = subscribeToResult(this, duration));
            }
            if (this._leading) {
                this.destination.next(value);
                if (this._trailing) {
                    this._hasTrailingValue = true;
                    this._trailingValue = value;
                }
            }
        }
    };
    ThrottleSubscriber.prototype.tryDurationSelector = function (value) {
        try {
            return this.durationSelector(value);
        }
        catch (err) {
            this.destination.error(err);
            return null;
        }
    };
    /** @deprecated internal use only */ ThrottleSubscriber.prototype._unsubscribe = function () {
        var _a = this, throttled = _a.throttled, _trailingValue = _a._trailingValue, _hasTrailingValue = _a._hasTrailingValue, _trailing = _a._trailing;
        this._trailingValue = null;
        this._hasTrailingValue = false;
        if (throttled) {
            this.remove(throttled);
            this.throttled = null;
            throttled.unsubscribe();
        }
    };
    ThrottleSubscriber.prototype._sendTrailing = function () {
        var _a = this, destination = _a.destination, throttled = _a.throttled, _trailing = _a._trailing, _trailingValue = _a._trailingValue, _hasTrailingValue = _a._hasTrailingValue;
        if (throttled && _trailing && _hasTrailingValue) {
            destination.next(_trailingValue);
            this._trailingValue = null;
            this._hasTrailingValue = false;
        }
    };
    ThrottleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this._sendTrailing();
        this._unsubscribe();
    };
    ThrottleSubscriber.prototype.notifyComplete = function () {
        this._sendTrailing();
        this._unsubscribe();
    };
    return ThrottleSubscriber;
}(OuterSubscriber));

/**
 * Emits a value from the source Observable, then ignores subsequent source
 * values for a duration determined by another Observable, then repeats this
 * process.
 *
 * <span class="informal">It's like {@link throttleTime}, but the silencing
 * duration is determined by a second Observable.</span>
 *
 * <img src="./img/throttle.png" width="100%">
 *
 * `throttle` emits the source Observable values on the output Observable
 * when its internal timer is disabled, and ignores source values when the timer
 * is enabled. Initially, the timer is disabled. As soon as the first source
 * value arrives, it is forwarded to the output Observable, and then the timer
 * is enabled by calling the `durationSelector` function with the source value,
 * which returns the "duration" Observable. When the duration Observable emits a
 * value or completes, the timer is disabled, and this process repeats for the
 * next source value.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.throttle(ev => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link audit}
 * @see {@link debounce}
 * @see {@link delayWhen}
 * @see {@link sample}
 * @see {@link throttleTime}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the silencing
 * duration for each source value, returned as an Observable or a Promise.
 * @param {Object} config a configuration object to define `leading` and `trailing` behavior. Defaults
 * to `{ leading: true, trailing: false }`.
 * @return {Observable<T>} An Observable that performs the throttle operation to
 * limit the rate of emissions from the source.
 * @method throttle
 * @owner Observable
 */
function throttle$$1(durationSelector, config) {
    if (config === void 0) { config = defaultThrottleConfig; }
    return throttle$1(durationSelector, config)(this);
}

Observable.prototype.throttle = throttle$$1;

/**
 * Emits a value from the source Observable, then ignores subsequent source
 * values for `duration` milliseconds, then repeats this process.
 *
 * <span class="informal">Lets a value pass, then ignores source values for the
 * next `duration` milliseconds.</span>
 *
 * <img src="./img/throttleTime.png" width="100%">
 *
 * `throttleTime` emits the source Observable values on the output Observable
 * when its internal timer is disabled, and ignores source values when the timer
 * is enabled. Initially, the timer is disabled. As soon as the first source
 * value arrives, it is forwarded to the output Observable, and then the timer
 * is enabled. After `duration` milliseconds (or the time unit determined
 * internally by the optional `scheduler`) has passed, the timer is disabled,
 * and this process repeats for the next source value. Optionally takes a
 * {@link IScheduler} for managing timers.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.throttleTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounceTime}
 * @see {@link delay}
 * @see {@link sampleTime}
 * @see {@link throttle}
 *
 * @param {number} duration Time to wait before emitting another value after
 * emitting the last value, measured in milliseconds or the time unit determined
 * internally by the optional `scheduler`.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the throttling.
 * @return {Observable<T>} An Observable that performs the throttle operation to
 * limit the rate of emissions from the source.
 * @method throttleTime
 * @owner Observable
 */
function throttleTime$1(duration, scheduler, config) {
    if (scheduler === void 0) { scheduler = async; }
    if (config === void 0) { config = defaultThrottleConfig; }
    return function (source) { return source.lift(new ThrottleTimeOperator(duration, scheduler, config.leading, config.trailing)); };
}
var ThrottleTimeOperator = (function () {
    function ThrottleTimeOperator(duration, scheduler, leading, trailing) {
        this.duration = duration;
        this.scheduler = scheduler;
        this.leading = leading;
        this.trailing = trailing;
    }
    ThrottleTimeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ThrottleTimeSubscriber(subscriber, this.duration, this.scheduler, this.leading, this.trailing));
    };
    return ThrottleTimeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ThrottleTimeSubscriber = (function (_super) {
    __extends(ThrottleTimeSubscriber, _super);
    function ThrottleTimeSubscriber(destination, duration, scheduler, leading, trailing) {
        _super.call(this, destination);
        this.duration = duration;
        this.scheduler = scheduler;
        this.leading = leading;
        this.trailing = trailing;
        this._hasTrailingValue = false;
        this._trailingValue = null;
    }
    ThrottleTimeSubscriber.prototype._next = function (value) {
        if (this.throttled) {
            if (this.trailing) {
                this._trailingValue = value;
                this._hasTrailingValue = true;
            }
        }
        else {
            this.add(this.throttled = this.scheduler.schedule(dispatchNext$4, this.duration, { subscriber: this }));
            if (this.leading) {
                this.destination.next(value);
            }
        }
    };
    ThrottleTimeSubscriber.prototype.clearThrottle = function () {
        var throttled = this.throttled;
        if (throttled) {
            if (this.trailing && this._hasTrailingValue) {
                this.destination.next(this._trailingValue);
                this._trailingValue = null;
                this._hasTrailingValue = false;
            }
            throttled.unsubscribe();
            this.remove(throttled);
            this.throttled = null;
        }
    };
    return ThrottleTimeSubscriber;
}(Subscriber));
function dispatchNext$4(arg) {
    var subscriber = arg.subscriber;
    subscriber.clearThrottle();
}

/**
 * Emits a value from the source Observable, then ignores subsequent source
 * values for `duration` milliseconds, then repeats this process.
 *
 * <span class="informal">Lets a value pass, then ignores source values for the
 * next `duration` milliseconds.</span>
 *
 * <img src="./img/throttleTime.png" width="100%">
 *
 * `throttleTime` emits the source Observable values on the output Observable
 * when its internal timer is disabled, and ignores source values when the timer
 * is enabled. Initially, the timer is disabled. As soon as the first source
 * value arrives, it is forwarded to the output Observable, and then the timer
 * is enabled. After `duration` milliseconds (or the time unit determined
 * internally by the optional `scheduler`) has passed, the timer is disabled,
 * and this process repeats for the next source value. Optionally takes a
 * {@link IScheduler} for managing timers.
 *
 * @example <caption>Emit clicks at a rate of at most one click per second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.throttleTime(1000);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link auditTime}
 * @see {@link debounceTime}
 * @see {@link delay}
 * @see {@link sampleTime}
 * @see {@link throttle}
 *
 * @param {number} duration Time to wait before emitting another value after
 * emitting the last value, measured in milliseconds or the time unit determined
 * internally by the optional `scheduler`.
 * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
 * managing the timers that handle the throttling.
 * @return {Observable<T>} An Observable that performs the throttle operation to
 * limit the rate of emissions from the source.
 * @method throttleTime
 * @owner Observable
 */
function throttleTime$$1(duration, scheduler, config) {
    if (scheduler === void 0) { scheduler = async; }
    if (config === void 0) { config = defaultThrottleConfig; }
    return throttleTime$1(duration, scheduler, config)(this);
}

Observable.prototype.throttleTime = throttleTime$$1;

function timeInterval$1(scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return function (source) { return source.lift(new TimeIntervalOperator(scheduler)); };
}
var TimeInterval = (function () {
    function TimeInterval(value, interval) {
        this.value = value;
        this.interval = interval;
    }
    return TimeInterval;
}());

var TimeIntervalOperator = (function () {
    function TimeIntervalOperator(scheduler) {
        this.scheduler = scheduler;
    }
    TimeIntervalOperator.prototype.call = function (observer, source) {
        return source.subscribe(new TimeIntervalSubscriber(observer, this.scheduler));
    };
    return TimeIntervalOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TimeIntervalSubscriber = (function (_super) {
    __extends(TimeIntervalSubscriber, _super);
    function TimeIntervalSubscriber(destination, scheduler) {
        _super.call(this, destination);
        this.scheduler = scheduler;
        this.lastTime = 0;
        this.lastTime = scheduler.now();
    }
    TimeIntervalSubscriber.prototype._next = function (value) {
        var now = this.scheduler.now();
        var span = now - this.lastTime;
        this.lastTime = now;
        this.destination.next(new TimeInterval(value, span));
    };
    return TimeIntervalSubscriber;
}(Subscriber));

/**
 * @param scheduler
 * @return {Observable<TimeInterval<any>>|WebSocketSubject<T>|Observable<T>}
 * @method timeInterval
 * @owner Observable
 */
function timeInterval$$1(scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return timeInterval$1(scheduler)(this);
}

Observable.prototype.timeInterval = timeInterval$$1;

/**
 * An error thrown when duetime elapses.
 *
 * @see {@link timeout}
 *
 * @class TimeoutError
 */
var TimeoutError = (function (_super) {
    __extends(TimeoutError, _super);
    function TimeoutError() {
        var err = _super.call(this, 'Timeout has occurred');
        this.name = err.name = 'TimeoutError';
        this.stack = err.stack;
        this.message = err.message;
    }
    return TimeoutError;
}(Error));

/**
 *
 * Errors if Observable does not emit a value in given time span.
 *
 * <span class="informal">Timeouts on Observable that doesn't emit values fast enough.</span>
 *
 * <img src="./img/timeout.png" width="100%">
 *
 * `timeout` operator accepts as an argument either a number or a Date.
 *
 * If number was provided, it returns an Observable that behaves like a source
 * Observable, unless there is a period of time where there is no value emitted.
 * So if you provide `100` as argument and first value comes after 50ms from
 * the moment of subscription, this value will be simply re-emitted by the resulting
 * Observable. If however after that 100ms passes without a second value being emitted,
 * stream will end with an error and source Observable will be unsubscribed.
 * These checks are performed throughout whole lifecycle of Observable - from the moment
 * it was subscribed to, until it completes or errors itself. Thus every value must be
 * emitted within specified period since previous value.
 *
 * If provided argument was Date, returned Observable behaves differently. It throws
 * if Observable did not complete before provided Date. This means that periods between
 * emission of particular values do not matter in this case. If Observable did not complete
 * before provided Date, source Observable will be unsubscribed. Other than that, resulting
 * stream behaves just as source Observable.
 *
 * `timeout` accepts also a Scheduler as a second parameter. It is used to schedule moment (or moments)
 * when returned Observable will check if source stream emitted value or completed.
 *
 * @example <caption>Check if ticks are emitted within certain timespan</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds.timeout(1100) // Let's use bigger timespan to be safe,
 *                       // since `interval` might fire a bit later then scheduled.
 * .subscribe(
 *     value => console.log(value), // Will emit numbers just as regular `interval` would.
 *     err => console.log(err) // Will never be called.
 * );
 *
 * seconds.timeout(900).subscribe(
 *     value => console.log(value), // Will never be called.
 *     err => console.log(err) // Will emit error before even first value is emitted,
 *                             // since it did not arrive within 900ms period.
 * );
 *
 * @example <caption>Use Date to check if Observable completed</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds.timeout(new Date("December 17, 2020 03:24:00"))
 * .subscribe(
 *     value => console.log(value), // Will emit values as regular `interval` would
 *                                  // until December 17, 2020 at 03:24:00.
 *     err => console.log(err) // On December 17, 2020 at 03:24:00 it will emit an error,
 *                             // since Observable did not complete by then.
 * );
 *
 * @see {@link timeoutWith}
 *
 * @param {number|Date} due Number specifying period within which Observable must emit values
 *                          or Date specifying before when Observable should complete
 * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
 * @return {Observable<T>} Observable that mirrors behaviour of source, unless timeout checks fail.
 * @method timeout
 * @owner Observable
 */
function timeout$1(due, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    var absoluteTimeout = isDate(due);
    var waitFor = absoluteTimeout ? (+due - scheduler.now()) : Math.abs(due);
    return function (source) { return source.lift(new TimeoutOperator(waitFor, absoluteTimeout, scheduler, new TimeoutError())); };
}
var TimeoutOperator = (function () {
    function TimeoutOperator(waitFor, absoluteTimeout, scheduler, errorInstance) {
        this.waitFor = waitFor;
        this.absoluteTimeout = absoluteTimeout;
        this.scheduler = scheduler;
        this.errorInstance = errorInstance;
    }
    TimeoutOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TimeoutSubscriber(subscriber, this.absoluteTimeout, this.waitFor, this.scheduler, this.errorInstance));
    };
    return TimeoutOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TimeoutSubscriber = (function (_super) {
    __extends(TimeoutSubscriber, _super);
    function TimeoutSubscriber(destination, absoluteTimeout, waitFor, scheduler, errorInstance) {
        _super.call(this, destination);
        this.absoluteTimeout = absoluteTimeout;
        this.waitFor = waitFor;
        this.scheduler = scheduler;
        this.errorInstance = errorInstance;
        this.action = null;
        this.scheduleTimeout();
    }
    TimeoutSubscriber.dispatchTimeout = function (subscriber) {
        subscriber.error(subscriber.errorInstance);
    };
    TimeoutSubscriber.prototype.scheduleTimeout = function () {
        var action = this.action;
        if (action) {
            // Recycle the action if we've already scheduled one. All the production
            // Scheduler Actions mutate their state/delay time and return themeselves.
            // VirtualActions are immutable, so they create and return a clone. In this
            // case, we need to set the action reference to the most recent VirtualAction,
            // to ensure that's the one we clone from next time.
            this.action = action.schedule(this, this.waitFor);
        }
        else {
            this.add(this.action = this.scheduler.schedule(TimeoutSubscriber.dispatchTimeout, this.waitFor, this));
        }
    };
    TimeoutSubscriber.prototype._next = function (value) {
        if (!this.absoluteTimeout) {
            this.scheduleTimeout();
        }
        _super.prototype._next.call(this, value);
    };
    /** @deprecated internal use only */ TimeoutSubscriber.prototype._unsubscribe = function () {
        this.action = null;
        this.scheduler = null;
        this.errorInstance = null;
    };
    return TimeoutSubscriber;
}(Subscriber));

/**
 *
 * Errors if Observable does not emit a value in given time span.
 *
 * <span class="informal">Timeouts on Observable that doesn't emit values fast enough.</span>
 *
 * <img src="./img/timeout.png" width="100%">
 *
 * `timeout` operator accepts as an argument either a number or a Date.
 *
 * If number was provided, it returns an Observable that behaves like a source
 * Observable, unless there is a period of time where there is no value emitted.
 * So if you provide `100` as argument and first value comes after 50ms from
 * the moment of subscription, this value will be simply re-emitted by the resulting
 * Observable. If however after that 100ms passes without a second value being emitted,
 * stream will end with an error and source Observable will be unsubscribed.
 * These checks are performed throughout whole lifecycle of Observable - from the moment
 * it was subscribed to, until it completes or errors itself. Thus every value must be
 * emitted within specified period since previous value.
 *
 * If provided argument was Date, returned Observable behaves differently. It throws
 * if Observable did not complete before provided Date. This means that periods between
 * emission of particular values do not matter in this case. If Observable did not complete
 * before provided Date, source Observable will be unsubscribed. Other than that, resulting
 * stream behaves just as source Observable.
 *
 * `timeout` accepts also a Scheduler as a second parameter. It is used to schedule moment (or moments)
 * when returned Observable will check if source stream emitted value or completed.
 *
 * @example <caption>Check if ticks are emitted within certain timespan</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds.timeout(1100) // Let's use bigger timespan to be safe,
 *                       // since `interval` might fire a bit later then scheduled.
 * .subscribe(
 *     value => console.log(value), // Will emit numbers just as regular `interval` would.
 *     err => console.log(err) // Will never be called.
 * );
 *
 * seconds.timeout(900).subscribe(
 *     value => console.log(value), // Will never be called.
 *     err => console.log(err) // Will emit error before even first value is emitted,
 *                             // since it did not arrive within 900ms period.
 * );
 *
 * @example <caption>Use Date to check if Observable completed</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds.timeout(new Date("December 17, 2020 03:24:00"))
 * .subscribe(
 *     value => console.log(value), // Will emit values as regular `interval` would
 *                                  // until December 17, 2020 at 03:24:00.
 *     err => console.log(err) // On December 17, 2020 at 03:24:00 it will emit an error,
 *                             // since Observable did not complete by then.
 * );
 *
 * @see {@link timeoutWith}
 *
 * @param {number|Date} due Number specifying period within which Observable must emit values
 *                          or Date specifying before when Observable should complete
 * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
 * @return {Observable<T>} Observable that mirrors behaviour of source, unless timeout checks fail.
 * @method timeout
 * @owner Observable
 */
function timeout$$1(due, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return timeout$1(due, scheduler)(this);
}

Observable.prototype.timeout = timeout$$1;

/* tslint:enable:max-line-length */
/**
 *
 * Errors if Observable does not emit a value in given time span, in case of which
 * subscribes to the second Observable.
 *
 * <span class="informal">It's a version of `timeout` operator that let's you specify fallback Observable.</span>
 *
 * <img src="./img/timeoutWith.png" width="100%">
 *
 * `timeoutWith` is a variation of `timeout` operator. It behaves exactly the same,
 * still accepting as a first argument either a number or a Date, which control - respectively -
 * when values of source Observable should be emitted or when it should complete.
 *
 * The only difference is that it accepts a second, required parameter. This parameter
 * should be an Observable which will be subscribed when source Observable fails any timeout check.
 * So whenever regular `timeout` would emit an error, `timeoutWith` will instead start re-emitting
 * values from second Observable. Note that this fallback Observable is not checked for timeouts
 * itself, so it can emit values and complete at arbitrary points in time. From the moment of a second
 * subscription, Observable returned from `timeoutWith` simply mirrors fallback stream. When that
 * stream completes, it completes as well.
 *
 * Scheduler, which in case of `timeout` is provided as as second argument, can be still provided
 * here - as a third, optional parameter. It still is used to schedule timeout checks and -
 * as a consequence - when second Observable will be subscribed, since subscription happens
 * immediately after failing check.
 *
 * @example <caption>Add fallback observable</caption>
 * const seconds = Rx.Observable.interval(1000);
 * const minutes = Rx.Observable.interval(60 * 1000);
 *
 * seconds.timeoutWith(900, minutes)
 *     .subscribe(
 *         value => console.log(value), // After 900ms, will start emitting `minutes`,
 *                                      // since first value of `seconds` will not arrive fast enough.
 *         err => console.log(err) // Would be called after 900ms in case of `timeout`,
 *                                 // but here will never be called.
 *     );
 *
 * @param {number|Date} due Number specifying period within which Observable must emit values
 *                          or Date specifying before when Observable should complete
 * @param {Observable<T>} withObservable Observable which will be subscribed if source fails timeout check.
 * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
 * @return {Observable<T>} Observable that mirrors behaviour of source or, when timeout check fails, of an Observable
 *                          passed as a second parameter.
 * @method timeoutWith
 * @owner Observable
 */
function timeoutWith$1(due, withObservable, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return function (source) {
        var absoluteTimeout = isDate(due);
        var waitFor = absoluteTimeout ? (+due - scheduler.now()) : Math.abs(due);
        return source.lift(new TimeoutWithOperator(waitFor, absoluteTimeout, withObservable, scheduler));
    };
}
var TimeoutWithOperator = (function () {
    function TimeoutWithOperator(waitFor, absoluteTimeout, withObservable, scheduler) {
        this.waitFor = waitFor;
        this.absoluteTimeout = absoluteTimeout;
        this.withObservable = withObservable;
        this.scheduler = scheduler;
    }
    TimeoutWithOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TimeoutWithSubscriber(subscriber, this.absoluteTimeout, this.waitFor, this.withObservable, this.scheduler));
    };
    return TimeoutWithOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TimeoutWithSubscriber = (function (_super) {
    __extends(TimeoutWithSubscriber, _super);
    function TimeoutWithSubscriber(destination, absoluteTimeout, waitFor, withObservable, scheduler) {
        _super.call(this, destination);
        this.absoluteTimeout = absoluteTimeout;
        this.waitFor = waitFor;
        this.withObservable = withObservable;
        this.scheduler = scheduler;
        this.action = null;
        this.scheduleTimeout();
    }
    TimeoutWithSubscriber.dispatchTimeout = function (subscriber) {
        var withObservable = subscriber.withObservable;
        subscriber._unsubscribeAndRecycle();
        subscriber.add(subscribeToResult(subscriber, withObservable));
    };
    TimeoutWithSubscriber.prototype.scheduleTimeout = function () {
        var action = this.action;
        if (action) {
            // Recycle the action if we've already scheduled one. All the production
            // Scheduler Actions mutate their state/delay time and return themeselves.
            // VirtualActions are immutable, so they create and return a clone. In this
            // case, we need to set the action reference to the most recent VirtualAction,
            // to ensure that's the one we clone from next time.
            this.action = action.schedule(this, this.waitFor);
        }
        else {
            this.add(this.action = this.scheduler.schedule(TimeoutWithSubscriber.dispatchTimeout, this.waitFor, this));
        }
    };
    TimeoutWithSubscriber.prototype._next = function (value) {
        if (!this.absoluteTimeout) {
            this.scheduleTimeout();
        }
        _super.prototype._next.call(this, value);
    };
    /** @deprecated internal use only */ TimeoutWithSubscriber.prototype._unsubscribe = function () {
        this.action = null;
        this.scheduler = null;
        this.withObservable = null;
    };
    return TimeoutWithSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 *
 * Errors if Observable does not emit a value in given time span, in case of which
 * subscribes to the second Observable.
 *
 * <span class="informal">It's a version of `timeout` operator that let's you specify fallback Observable.</span>
 *
 * <img src="./img/timeoutWith.png" width="100%">
 *
 * `timeoutWith` is a variation of `timeout` operator. It behaves exactly the same,
 * still accepting as a first argument either a number or a Date, which control - respectively -
 * when values of source Observable should be emitted or when it should complete.
 *
 * The only difference is that it accepts a second, required parameter. This parameter
 * should be an Observable which will be subscribed when source Observable fails any timeout check.
 * So whenever regular `timeout` would emit an error, `timeoutWith` will instead start re-emitting
 * values from second Observable. Note that this fallback Observable is not checked for timeouts
 * itself, so it can emit values and complete at arbitrary points in time. From the moment of a second
 * subscription, Observable returned from `timeoutWith` simply mirrors fallback stream. When that
 * stream completes, it completes as well.
 *
 * Scheduler, which in case of `timeout` is provided as as second argument, can be still provided
 * here - as a third, optional parameter. It still is used to schedule timeout checks and -
 * as a consequence - when second Observable will be subscribed, since subscription happens
 * immediately after failing check.
 *
 * @example <caption>Add fallback observable</caption>
 * const seconds = Rx.Observable.interval(1000);
 * const minutes = Rx.Observable.interval(60 * 1000);
 *
 * seconds.timeoutWith(900, minutes)
 *     .subscribe(
 *         value => console.log(value), // After 900ms, will start emitting `minutes`,
 *                                      // since first value of `seconds` will not arrive fast enough.
 *         err => console.log(err) // Would be called after 900ms in case of `timeout`,
 *                                 // but here will never be called.
 *     );
 *
 * @param {number|Date} due Number specifying period within which Observable must emit values
 *                          or Date specifying before when Observable should complete
 * @param {Observable<T>} withObservable Observable which will be subscribed if source fails timeout check.
 * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
 * @return {Observable<T>} Observable that mirrors behaviour of source or, when timeout check fails, of an Observable
 *                          passed as a second parameter.
 * @method timeoutWith
 * @owner Observable
 */
function timeoutWith$$1(due, withObservable, scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return timeoutWith$1(due, withObservable, scheduler)(this);
}

Observable.prototype.timeoutWith = timeoutWith$$1;

/**
 * @param scheduler
 * @return {Observable<Timestamp<any>>|WebSocketSubject<T>|Observable<T>}
 * @method timestamp
 * @owner Observable
 */
function timestamp$1(scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return map(function (value) { return new Timestamp(value, scheduler.now()); });
    // return (source: Observable<T>) => source.lift(new TimestampOperator(scheduler));
}
var Timestamp = (function () {
    function Timestamp(value, timestamp) {
        this.value = value;
        this.timestamp = timestamp;
    }
    return Timestamp;
}());

/**
 * @param scheduler
 * @return {Observable<Timestamp<any>>|WebSocketSubject<T>|Observable<T>}
 * @method timestamp
 * @owner Observable
 */
function timestamp$$1(scheduler) {
    if (scheduler === void 0) { scheduler = async; }
    return timestamp$1(scheduler)(this);
}

Observable.prototype.timestamp = timestamp$$1;

function toArrayReducer(arr, item, index) {
    if (index === 0) {
        return [item];
    }
    arr.push(item);
    return arr;
}
function toArray$1() {
    return reduce(toArrayReducer, []);
}

/**
 * Collects all source emissions and emits them as an array when the source completes.
 *
 * <span class="informal">Get all values inside an array when the source completes</span>
 *
 * <img src="./img/toArray.png" width="100%">
 *
 * `toArray` will wait until the source Observable completes
 * before emitting the array containing all emissions.
 * When the source Observable errors no array will be emitted.
 *
 * @example <caption>Create array from input</caption>
 * const input = Rx.Observable.interval(100).take(4);
 *
 * input.toArray()
 *   .subscribe(arr => console.log(arr)); // [0,1,2,3]
 *
 * @see {@link buffer}
 *
 * @return {Observable<any[]>|WebSocketSubject<T>|Observable<T>}
 * @method toArray
 * @owner Observable
 */
function toArray$$1() {
    return toArray$1()(this);
}

Observable.prototype.toArray = toArray$$1;

// HACK: does nothing, because `toPromise` now lives on the `Observable` itself.
// leaving this module here to prevent breakage.

/**
 * Branch out the source Observable values as a nested Observable whenever
 * `windowBoundaries` emits.
 *
 * <span class="informal">It's like {@link buffer}, but emits a nested Observable
 * instead of an array.</span>
 *
 * <img src="./img/window.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits connected, non-overlapping
 * windows. It emits the current window and opens a new one whenever the
 * Observable `windowBoundaries` emits an item. Because each window is an
 * Observable, the output is a higher-order Observable.
 *
 * @example <caption>In every window of 1 second each, emit at most 2 click events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var interval = Rx.Observable.interval(1000);
 * var result = clicks.window(interval)
 *   .map(win => win.take(2)) // each window has at most 2 emissions
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @see {@link windowCount}
 * @see {@link windowTime}
 * @see {@link windowToggle}
 * @see {@link windowWhen}
 * @see {@link buffer}
 *
 * @param {Observable<any>} windowBoundaries An Observable that completes the
 * previous window and starts a new window.
 * @return {Observable<Observable<T>>} An Observable of windows, which are
 * Observables emitting values of the source Observable.
 * @method window
 * @owner Observable
 */
function window$2(windowBoundaries) {
    return function windowOperatorFunction(source) {
        return source.lift(new WindowOperator(windowBoundaries));
    };
}
var WindowOperator = (function () {
    function WindowOperator(windowBoundaries) {
        this.windowBoundaries = windowBoundaries;
    }
    WindowOperator.prototype.call = function (subscriber, source) {
        var windowSubscriber = new WindowSubscriber(subscriber);
        var sourceSubscription = source.subscribe(windowSubscriber);
        if (!sourceSubscription.closed) {
            windowSubscriber.add(subscribeToResult(windowSubscriber, this.windowBoundaries));
        }
        return sourceSubscription;
    };
    return WindowOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WindowSubscriber = (function (_super) {
    __extends(WindowSubscriber, _super);
    function WindowSubscriber(destination) {
        _super.call(this, destination);
        this.window = new Subject();
        destination.next(this.window);
    }
    WindowSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.openWindow();
    };
    WindowSubscriber.prototype.notifyError = function (error, innerSub) {
        this._error(error);
    };
    WindowSubscriber.prototype.notifyComplete = function (innerSub) {
        this._complete();
    };
    WindowSubscriber.prototype._next = function (value) {
        this.window.next(value);
    };
    WindowSubscriber.prototype._error = function (err) {
        this.window.error(err);
        this.destination.error(err);
    };
    WindowSubscriber.prototype._complete = function () {
        this.window.complete();
        this.destination.complete();
    };
    /** @deprecated internal use only */ WindowSubscriber.prototype._unsubscribe = function () {
        this.window = null;
    };
    WindowSubscriber.prototype.openWindow = function () {
        var prevWindow = this.window;
        if (prevWindow) {
            prevWindow.complete();
        }
        var destination = this.destination;
        var newWindow = this.window = new Subject();
        destination.next(newWindow);
    };
    return WindowSubscriber;
}(OuterSubscriber));

/**
 * Branch out the source Observable values as a nested Observable whenever
 * `windowBoundaries` emits.
 *
 * <span class="informal">It's like {@link buffer}, but emits a nested Observable
 * instead of an array.</span>
 *
 * <img src="./img/window.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits connected, non-overlapping
 * windows. It emits the current window and opens a new one whenever the
 * Observable `windowBoundaries` emits an item. Because each window is an
 * Observable, the output is a higher-order Observable.
 *
 * @example <caption>In every window of 1 second each, emit at most 2 click events</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var interval = Rx.Observable.interval(1000);
 * var result = clicks.window(interval)
 *   .map(win => win.take(2)) // each window has at most 2 emissions
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @see {@link windowCount}
 * @see {@link windowTime}
 * @see {@link windowToggle}
 * @see {@link windowWhen}
 * @see {@link buffer}
 *
 * @param {Observable<any>} windowBoundaries An Observable that completes the
 * previous window and starts a new window.
 * @return {Observable<Observable<T>>} An Observable of windows, which are
 * Observables emitting values of the source Observable.
 * @method window
 * @owner Observable
 */
function window$1(windowBoundaries) {
    return window$2(windowBoundaries)(this);
}

Observable.prototype.window = window$1;

/**
 * Branch out the source Observable values as a nested Observable with each
 * nested Observable emitting at most `windowSize` values.
 *
 * <span class="informal">It's like {@link bufferCount}, but emits a nested
 * Observable instead of an array.</span>
 *
 * <img src="./img/windowCount.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits windows every `startWindowEvery`
 * items, each containing no more than `windowSize` items. When the source
 * Observable completes or encounters an error, the output Observable emits
 * the current window and propagates the notification from the source
 * Observable. If `startWindowEvery` is not provided, then new windows are
 * started immediately at the start of the source and when each window completes
 * with size `windowSize`.
 *
 * @example <caption>Ignore every 3rd click event, starting from the first one</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.windowCount(3)
 *   .map(win => win.skip(1)) // skip first of every 3 clicks
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @example <caption>Ignore every 3rd click event, starting from the third one</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.windowCount(2, 3)
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @see {@link window}
 * @see {@link windowTime}
 * @see {@link windowToggle}
 * @see {@link windowWhen}
 * @see {@link bufferCount}
 *
 * @param {number} windowSize The maximum number of values emitted by each
 * window.
 * @param {number} [startWindowEvery] Interval at which to start a new window.
 * For example if `startWindowEvery` is `2`, then a new window will be started
 * on every other value from the source. A new window is started at the
 * beginning of the source by default.
 * @return {Observable<Observable<T>>} An Observable of windows, which in turn
 * are Observable of values.
 * @method windowCount
 * @owner Observable
 */
function windowCount$1(windowSize, startWindowEvery) {
    if (startWindowEvery === void 0) { startWindowEvery = 0; }
    return function windowCountOperatorFunction(source) {
        return source.lift(new WindowCountOperator(windowSize, startWindowEvery));
    };
}
var WindowCountOperator = (function () {
    function WindowCountOperator(windowSize, startWindowEvery) {
        this.windowSize = windowSize;
        this.startWindowEvery = startWindowEvery;
    }
    WindowCountOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new WindowCountSubscriber(subscriber, this.windowSize, this.startWindowEvery));
    };
    return WindowCountOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WindowCountSubscriber = (function (_super) {
    __extends(WindowCountSubscriber, _super);
    function WindowCountSubscriber(destination, windowSize, startWindowEvery) {
        _super.call(this, destination);
        this.destination = destination;
        this.windowSize = windowSize;
        this.startWindowEvery = startWindowEvery;
        this.windows = [new Subject()];
        this.count = 0;
        destination.next(this.windows[0]);
    }
    WindowCountSubscriber.prototype._next = function (value) {
        var startWindowEvery = (this.startWindowEvery > 0) ? this.startWindowEvery : this.windowSize;
        var destination = this.destination;
        var windowSize = this.windowSize;
        var windows = this.windows;
        var len = windows.length;
        for (var i = 0; i < len && !this.closed; i++) {
            windows[i].next(value);
        }
        var c = this.count - windowSize + 1;
        if (c >= 0 && c % startWindowEvery === 0 && !this.closed) {
            windows.shift().complete();
        }
        if (++this.count % startWindowEvery === 0 && !this.closed) {
            var window_1 = new Subject();
            windows.push(window_1);
            destination.next(window_1);
        }
    };
    WindowCountSubscriber.prototype._error = function (err) {
        var windows = this.windows;
        if (windows) {
            while (windows.length > 0 && !this.closed) {
                windows.shift().error(err);
            }
        }
        this.destination.error(err);
    };
    WindowCountSubscriber.prototype._complete = function () {
        var windows = this.windows;
        if (windows) {
            while (windows.length > 0 && !this.closed) {
                windows.shift().complete();
            }
        }
        this.destination.complete();
    };
    /** @deprecated internal use only */ WindowCountSubscriber.prototype._unsubscribe = function () {
        this.count = 0;
        this.windows = null;
    };
    return WindowCountSubscriber;
}(Subscriber));

/**
 * Branch out the source Observable values as a nested Observable with each
 * nested Observable emitting at most `windowSize` values.
 *
 * <span class="informal">It's like {@link bufferCount}, but emits a nested
 * Observable instead of an array.</span>
 *
 * <img src="./img/windowCount.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits windows every `startWindowEvery`
 * items, each containing no more than `windowSize` items. When the source
 * Observable completes or encounters an error, the output Observable emits
 * the current window and propagates the notification from the source
 * Observable. If `startWindowEvery` is not provided, then new windows are
 * started immediately at the start of the source and when each window completes
 * with size `windowSize`.
 *
 * @example <caption>Ignore every 3rd click event, starting from the first one</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.windowCount(3)
 *   .map(win => win.skip(1)) // skip first of every 3 clicks
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @example <caption>Ignore every 3rd click event, starting from the third one</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.windowCount(2, 3)
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @see {@link window}
 * @see {@link windowTime}
 * @see {@link windowToggle}
 * @see {@link windowWhen}
 * @see {@link bufferCount}
 *
 * @param {number} windowSize The maximum number of values emitted by each
 * window.
 * @param {number} [startWindowEvery] Interval at which to start a new window.
 * For example if `startWindowEvery` is `2`, then a new window will be started
 * on every other value from the source. A new window is started at the
 * beginning of the source by default.
 * @return {Observable<Observable<T>>} An Observable of windows, which in turn
 * are Observable of values.
 * @method windowCount
 * @owner Observable
 */
function windowCount$$1(windowSize, startWindowEvery) {
    if (startWindowEvery === void 0) { startWindowEvery = 0; }
    return windowCount$1(windowSize, startWindowEvery)(this);
}

Observable.prototype.windowCount = windowCount$$1;

function windowTime$1(windowTimeSpan) {
    var scheduler = async;
    var windowCreationInterval = null;
    var maxWindowSize = Number.POSITIVE_INFINITY;
    if (isScheduler(arguments[3])) {
        scheduler = arguments[3];
    }
    if (isScheduler(arguments[2])) {
        scheduler = arguments[2];
    }
    else if (isNumeric(arguments[2])) {
        maxWindowSize = arguments[2];
    }
    if (isScheduler(arguments[1])) {
        scheduler = arguments[1];
    }
    else if (isNumeric(arguments[1])) {
        windowCreationInterval = arguments[1];
    }
    return function windowTimeOperatorFunction(source) {
        return source.lift(new WindowTimeOperator(windowTimeSpan, windowCreationInterval, maxWindowSize, scheduler));
    };
}
var WindowTimeOperator = (function () {
    function WindowTimeOperator(windowTimeSpan, windowCreationInterval, maxWindowSize, scheduler) {
        this.windowTimeSpan = windowTimeSpan;
        this.windowCreationInterval = windowCreationInterval;
        this.maxWindowSize = maxWindowSize;
        this.scheduler = scheduler;
    }
    WindowTimeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new WindowTimeSubscriber(subscriber, this.windowTimeSpan, this.windowCreationInterval, this.maxWindowSize, this.scheduler));
    };
    return WindowTimeOperator;
}());
var CountedSubject = (function (_super) {
    __extends(CountedSubject, _super);
    function CountedSubject() {
        _super.apply(this, arguments);
        this._numberOfNextedValues = 0;
    }
    CountedSubject.prototype.next = function (value) {
        this._numberOfNextedValues++;
        _super.prototype.next.call(this, value);
    };
    Object.defineProperty(CountedSubject.prototype, "numberOfNextedValues", {
        get: function () {
            return this._numberOfNextedValues;
        },
        enumerable: true,
        configurable: true
    });
    return CountedSubject;
}(Subject));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WindowTimeSubscriber = (function (_super) {
    __extends(WindowTimeSubscriber, _super);
    function WindowTimeSubscriber(destination, windowTimeSpan, windowCreationInterval, maxWindowSize, scheduler) {
        _super.call(this, destination);
        this.destination = destination;
        this.windowTimeSpan = windowTimeSpan;
        this.windowCreationInterval = windowCreationInterval;
        this.maxWindowSize = maxWindowSize;
        this.scheduler = scheduler;
        this.windows = [];
        var window = this.openWindow();
        if (windowCreationInterval !== null && windowCreationInterval >= 0) {
            var closeState = { subscriber: this, window: window, context: null };
            var creationState = { windowTimeSpan: windowTimeSpan, windowCreationInterval: windowCreationInterval, subscriber: this, scheduler: scheduler };
            this.add(scheduler.schedule(dispatchWindowClose, windowTimeSpan, closeState));
            this.add(scheduler.schedule(dispatchWindowCreation, windowCreationInterval, creationState));
        }
        else {
            var timeSpanOnlyState = { subscriber: this, window: window, windowTimeSpan: windowTimeSpan };
            this.add(scheduler.schedule(dispatchWindowTimeSpanOnly, windowTimeSpan, timeSpanOnlyState));
        }
    }
    WindowTimeSubscriber.prototype._next = function (value) {
        var windows = this.windows;
        var len = windows.length;
        for (var i = 0; i < len; i++) {
            var window_1 = windows[i];
            if (!window_1.closed) {
                window_1.next(value);
                if (window_1.numberOfNextedValues >= this.maxWindowSize) {
                    this.closeWindow(window_1);
                }
            }
        }
    };
    WindowTimeSubscriber.prototype._error = function (err) {
        var windows = this.windows;
        while (windows.length > 0) {
            windows.shift().error(err);
        }
        this.destination.error(err);
    };
    WindowTimeSubscriber.prototype._complete = function () {
        var windows = this.windows;
        while (windows.length > 0) {
            var window_2 = windows.shift();
            if (!window_2.closed) {
                window_2.complete();
            }
        }
        this.destination.complete();
    };
    WindowTimeSubscriber.prototype.openWindow = function () {
        var window = new CountedSubject();
        this.windows.push(window);
        var destination = this.destination;
        destination.next(window);
        return window;
    };
    WindowTimeSubscriber.prototype.closeWindow = function (window) {
        window.complete();
        var windows = this.windows;
        windows.splice(windows.indexOf(window), 1);
    };
    return WindowTimeSubscriber;
}(Subscriber));
function dispatchWindowTimeSpanOnly(state) {
    var subscriber = state.subscriber, windowTimeSpan = state.windowTimeSpan, window = state.window;
    if (window) {
        subscriber.closeWindow(window);
    }
    state.window = subscriber.openWindow();
    this.schedule(state, windowTimeSpan);
}
function dispatchWindowCreation(state) {
    var windowTimeSpan = state.windowTimeSpan, subscriber = state.subscriber, scheduler = state.scheduler, windowCreationInterval = state.windowCreationInterval;
    var window = subscriber.openWindow();
    var action = this;
    var context = { action: action, subscription: null };
    var timeSpanState = { subscriber: subscriber, window: window, context: context };
    context.subscription = scheduler.schedule(dispatchWindowClose, windowTimeSpan, timeSpanState);
    action.add(context.subscription);
    action.schedule(state, windowCreationInterval);
}
function dispatchWindowClose(state) {
    var subscriber = state.subscriber, window = state.window, context = state.context;
    if (context && context.action && context.subscription) {
        context.action.remove(context.subscription);
    }
    subscriber.closeWindow(window);
}

function windowTime$$1(windowTimeSpan) {
    var scheduler = async;
    var windowCreationInterval = null;
    var maxWindowSize = Number.POSITIVE_INFINITY;
    if (isScheduler(arguments[3])) {
        scheduler = arguments[3];
    }
    if (isScheduler(arguments[2])) {
        scheduler = arguments[2];
    }
    else if (isNumeric(arguments[2])) {
        maxWindowSize = arguments[2];
    }
    if (isScheduler(arguments[1])) {
        scheduler = arguments[1];
    }
    else if (isNumeric(arguments[1])) {
        windowCreationInterval = arguments[1];
    }
    return windowTime$1(windowTimeSpan, windowCreationInterval, maxWindowSize, scheduler)(this);
}

Observable.prototype.windowTime = windowTime$$1;

/**
 * Branch out the source Observable values as a nested Observable starting from
 * an emission from `openings` and ending when the output of `closingSelector`
 * emits.
 *
 * <span class="informal">It's like {@link bufferToggle}, but emits a nested
 * Observable instead of an array.</span>
 *
 * <img src="./img/windowToggle.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits windows that contain those items
 * emitted by the source Observable between the time when the `openings`
 * Observable emits an item and when the Observable returned by
 * `closingSelector` emits an item.
 *
 * @example <caption>Every other second, emit the click events from the next 500ms</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var openings = Rx.Observable.interval(1000);
 * var result = clicks.windowToggle(openings, i =>
 *   i % 2 ? Rx.Observable.interval(500) : Rx.Observable.empty()
 * ).mergeAll();
 * result.subscribe(x => console.log(x));
 *
 * @see {@link window}
 * @see {@link windowCount}
 * @see {@link windowTime}
 * @see {@link windowWhen}
 * @see {@link bufferToggle}
 *
 * @param {Observable<O>} openings An observable of notifications to start new
 * windows.
 * @param {function(value: O): Observable} closingSelector A function that takes
 * the value emitted by the `openings` observable and returns an Observable,
 * which, when it emits (either `next` or `complete`), signals that the
 * associated window should complete.
 * @return {Observable<Observable<T>>} An observable of windows, which in turn
 * are Observables.
 * @method windowToggle
 * @owner Observable
 */
function windowToggle$1(openings, closingSelector) {
    return function (source) { return source.lift(new WindowToggleOperator(openings, closingSelector)); };
}
var WindowToggleOperator = (function () {
    function WindowToggleOperator(openings, closingSelector) {
        this.openings = openings;
        this.closingSelector = closingSelector;
    }
    WindowToggleOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new WindowToggleSubscriber(subscriber, this.openings, this.closingSelector));
    };
    return WindowToggleOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WindowToggleSubscriber = (function (_super) {
    __extends(WindowToggleSubscriber, _super);
    function WindowToggleSubscriber(destination, openings, closingSelector) {
        _super.call(this, destination);
        this.openings = openings;
        this.closingSelector = closingSelector;
        this.contexts = [];
        this.add(this.openSubscription = subscribeToResult(this, openings, openings));
    }
    WindowToggleSubscriber.prototype._next = function (value) {
        var contexts = this.contexts;
        if (contexts) {
            var len = contexts.length;
            for (var i = 0; i < len; i++) {
                contexts[i].window.next(value);
            }
        }
    };
    WindowToggleSubscriber.prototype._error = function (err) {
        var contexts = this.contexts;
        this.contexts = null;
        if (contexts) {
            var len = contexts.length;
            var index = -1;
            while (++index < len) {
                var context = contexts[index];
                context.window.error(err);
                context.subscription.unsubscribe();
            }
        }
        _super.prototype._error.call(this, err);
    };
    WindowToggleSubscriber.prototype._complete = function () {
        var contexts = this.contexts;
        this.contexts = null;
        if (contexts) {
            var len = contexts.length;
            var index = -1;
            while (++index < len) {
                var context = contexts[index];
                context.window.complete();
                context.subscription.unsubscribe();
            }
        }
        _super.prototype._complete.call(this);
    };
    /** @deprecated internal use only */ WindowToggleSubscriber.prototype._unsubscribe = function () {
        var contexts = this.contexts;
        this.contexts = null;
        if (contexts) {
            var len = contexts.length;
            var index = -1;
            while (++index < len) {
                var context = contexts[index];
                context.window.unsubscribe();
                context.subscription.unsubscribe();
            }
        }
    };
    WindowToggleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        if (outerValue === this.openings) {
            var closingSelector = this.closingSelector;
            var closingNotifier = tryCatch(closingSelector)(innerValue);
            if (closingNotifier === errorObject) {
                return this.error(errorObject.e);
            }
            else {
                var window_1 = new Subject();
                var subscription = new Subscription();
                var context = { window: window_1, subscription: subscription };
                this.contexts.push(context);
                var innerSubscription = subscribeToResult(this, closingNotifier, context);
                if (innerSubscription.closed) {
                    this.closeWindow(this.contexts.length - 1);
                }
                else {
                    innerSubscription.context = context;
                    subscription.add(innerSubscription);
                }
                this.destination.next(window_1);
            }
        }
        else {
            this.closeWindow(this.contexts.indexOf(outerValue));
        }
    };
    WindowToggleSubscriber.prototype.notifyError = function (err) {
        this.error(err);
    };
    WindowToggleSubscriber.prototype.notifyComplete = function (inner) {
        if (inner !== this.openSubscription) {
            this.closeWindow(this.contexts.indexOf(inner.context));
        }
    };
    WindowToggleSubscriber.prototype.closeWindow = function (index) {
        if (index === -1) {
            return;
        }
        var contexts = this.contexts;
        var context = contexts[index];
        var window = context.window, subscription = context.subscription;
        contexts.splice(index, 1);
        window.complete();
        subscription.unsubscribe();
    };
    return WindowToggleSubscriber;
}(OuterSubscriber));

/**
 * Branch out the source Observable values as a nested Observable starting from
 * an emission from `openings` and ending when the output of `closingSelector`
 * emits.
 *
 * <span class="informal">It's like {@link bufferToggle}, but emits a nested
 * Observable instead of an array.</span>
 *
 * <img src="./img/windowToggle.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits windows that contain those items
 * emitted by the source Observable between the time when the `openings`
 * Observable emits an item and when the Observable returned by
 * `closingSelector` emits an item.
 *
 * @example <caption>Every other second, emit the click events from the next 500ms</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var openings = Rx.Observable.interval(1000);
 * var result = clicks.windowToggle(openings, i =>
 *   i % 2 ? Rx.Observable.interval(500) : Rx.Observable.empty()
 * ).mergeAll();
 * result.subscribe(x => console.log(x));
 *
 * @see {@link window}
 * @see {@link windowCount}
 * @see {@link windowTime}
 * @see {@link windowWhen}
 * @see {@link bufferToggle}
 *
 * @param {Observable<O>} openings An observable of notifications to start new
 * windows.
 * @param {function(value: O): Observable} closingSelector A function that takes
 * the value emitted by the `openings` observable and returns an Observable,
 * which, when it emits (either `next` or `complete`), signals that the
 * associated window should complete.
 * @return {Observable<Observable<T>>} An observable of windows, which in turn
 * are Observables.
 * @method windowToggle
 * @owner Observable
 */
function windowToggle$$1(openings, closingSelector) {
    return windowToggle$1(openings, closingSelector)(this);
}

Observable.prototype.windowToggle = windowToggle$$1;

/**
 * Branch out the source Observable values as a nested Observable using a
 * factory function of closing Observables to determine when to start a new
 * window.
 *
 * <span class="informal">It's like {@link bufferWhen}, but emits a nested
 * Observable instead of an array.</span>
 *
 * <img src="./img/windowWhen.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits connected, non-overlapping windows.
 * It emits the current window and opens a new one whenever the Observable
 * produced by the specified `closingSelector` function emits an item. The first
 * window is opened immediately when subscribing to the output Observable.
 *
 * @example <caption>Emit only the first two clicks events in every window of [1-5] random seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks
 *   .windowWhen(() => Rx.Observable.interval(1000 + Math.random() * 4000))
 *   .map(win => win.take(2)) // each window has at most 2 emissions
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @see {@link window}
 * @see {@link windowCount}
 * @see {@link windowTime}
 * @see {@link windowToggle}
 * @see {@link bufferWhen}
 *
 * @param {function(): Observable} closingSelector A function that takes no
 * arguments and returns an Observable that signals (on either `next` or
 * `complete`) when to close the previous window and start a new one.
 * @return {Observable<Observable<T>>} An observable of windows, which in turn
 * are Observables.
 * @method windowWhen
 * @owner Observable
 */
function windowWhen$1(closingSelector) {
    return function windowWhenOperatorFunction(source) {
        return source.lift(new WindowOperator$1(closingSelector));
    };
}
var WindowOperator$1 = (function () {
    function WindowOperator(closingSelector) {
        this.closingSelector = closingSelector;
    }
    WindowOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new WindowSubscriber$1(subscriber, this.closingSelector));
    };
    return WindowOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WindowSubscriber$1 = (function (_super) {
    __extends(WindowSubscriber, _super);
    function WindowSubscriber(destination, closingSelector) {
        _super.call(this, destination);
        this.destination = destination;
        this.closingSelector = closingSelector;
        this.openWindow();
    }
    WindowSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.openWindow(innerSub);
    };
    WindowSubscriber.prototype.notifyError = function (error, innerSub) {
        this._error(error);
    };
    WindowSubscriber.prototype.notifyComplete = function (innerSub) {
        this.openWindow(innerSub);
    };
    WindowSubscriber.prototype._next = function (value) {
        this.window.next(value);
    };
    WindowSubscriber.prototype._error = function (err) {
        this.window.error(err);
        this.destination.error(err);
        this.unsubscribeClosingNotification();
    };
    WindowSubscriber.prototype._complete = function () {
        this.window.complete();
        this.destination.complete();
        this.unsubscribeClosingNotification();
    };
    WindowSubscriber.prototype.unsubscribeClosingNotification = function () {
        if (this.closingNotification) {
            this.closingNotification.unsubscribe();
        }
    };
    WindowSubscriber.prototype.openWindow = function (innerSub) {
        if (innerSub === void 0) { innerSub = null; }
        if (innerSub) {
            this.remove(innerSub);
            innerSub.unsubscribe();
        }
        var prevWindow = this.window;
        if (prevWindow) {
            prevWindow.complete();
        }
        var window = this.window = new Subject();
        this.destination.next(window);
        var closingNotifier = tryCatch(this.closingSelector)();
        if (closingNotifier === errorObject) {
            var err = errorObject.e;
            this.destination.error(err);
            this.window.error(err);
        }
        else {
            this.add(this.closingNotification = subscribeToResult(this, closingNotifier));
        }
    };
    return WindowSubscriber;
}(OuterSubscriber));

/**
 * Branch out the source Observable values as a nested Observable using a
 * factory function of closing Observables to determine when to start a new
 * window.
 *
 * <span class="informal">It's like {@link bufferWhen}, but emits a nested
 * Observable instead of an array.</span>
 *
 * <img src="./img/windowWhen.png" width="100%">
 *
 * Returns an Observable that emits windows of items it collects from the source
 * Observable. The output Observable emits connected, non-overlapping windows.
 * It emits the current window and opens a new one whenever the Observable
 * produced by the specified `closingSelector` function emits an item. The first
 * window is opened immediately when subscribing to the output Observable.
 *
 * @example <caption>Emit only the first two clicks events in every window of [1-5] random seconds</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks
 *   .windowWhen(() => Rx.Observable.interval(1000 + Math.random() * 4000))
 *   .map(win => win.take(2)) // each window has at most 2 emissions
 *   .mergeAll(); // flatten the Observable-of-Observables
 * result.subscribe(x => console.log(x));
 *
 * @see {@link window}
 * @see {@link windowCount}
 * @see {@link windowTime}
 * @see {@link windowToggle}
 * @see {@link bufferWhen}
 *
 * @param {function(): Observable} closingSelector A function that takes no
 * arguments and returns an Observable that signals (on either `next` or
 * `complete`) when to close the previous window and start a new one.
 * @return {Observable<Observable<T>>} An observable of windows, which in turn
 * are Observables.
 * @method windowWhen
 * @owner Observable
 */
function windowWhen$$1(closingSelector) {
    return windowWhen$1(closingSelector)(this);
}

Observable.prototype.windowWhen = windowWhen$$1;

/* tslint:enable:max-line-length */
/**
 * Combines the source Observable with other Observables to create an Observable
 * whose values are calculated from the latest values of each, only when the
 * source emits.
 *
 * <span class="informal">Whenever the source Observable emits a value, it
 * computes a formula using that value plus the latest values from other input
 * Observables, then emits the output of that formula.</span>
 *
 * <img src="./img/withLatestFrom.png" width="100%">
 *
 * `withLatestFrom` combines each value from the source Observable (the
 * instance) with the latest values from the other input Observables only when
 * the source emits a value, optionally using a `project` function to determine
 * the value to be emitted on the output Observable. All input Observables must
 * emit at least one value before the output Observable will emit a value.
 *
 * @example <caption>On every click event, emit an array with the latest timer event plus the click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var timer = Rx.Observable.interval(1000);
 * var result = clicks.withLatestFrom(timer);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link combineLatest}
 *
 * @param {ObservableInput} other An input Observable to combine with the source
 * Observable. More than one input Observables may be given as argument.
 * @param {Function} [project] Projection function for combining values
 * together. Receives all values in order of the Observables passed, where the
 * first parameter is a value from the source Observable. (e.g.
 * `a.withLatestFrom(b, c, (a1, b1, c1) => a1 + b1 + c1)`). If this is not
 * passed, arrays will be emitted on the output Observable.
 * @return {Observable} An Observable of projected values from the most recent
 * values from each input Observable, or an array of the most recent values from
 * each input Observable.
 * @method withLatestFrom
 * @owner Observable
 */
function withLatestFrom$1() {
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i - 0] = arguments[_i];
    }
    return function (source) {
        var project;
        if (typeof args[args.length - 1] === 'function') {
            project = args.pop();
        }
        var observables = args;
        return source.lift(new WithLatestFromOperator(observables, project));
    };
}
var WithLatestFromOperator = (function () {
    function WithLatestFromOperator(observables, project) {
        this.observables = observables;
        this.project = project;
    }
    WithLatestFromOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));
    };
    return WithLatestFromOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WithLatestFromSubscriber = (function (_super) {
    __extends(WithLatestFromSubscriber, _super);
    function WithLatestFromSubscriber(destination, observables, project) {
        _super.call(this, destination);
        this.observables = observables;
        this.project = project;
        this.toRespond = [];
        var len = observables.length;
        this.values = new Array(len);
        for (var i = 0; i < len; i++) {
            this.toRespond.push(i);
        }
        for (var i = 0; i < len; i++) {
            var observable = observables[i];
            this.add(subscribeToResult(this, observable, observable, i));
        }
    }
    WithLatestFromSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.values[outerIndex] = innerValue;
        var toRespond = this.toRespond;
        if (toRespond.length > 0) {
            var found = toRespond.indexOf(outerIndex);
            if (found !== -1) {
                toRespond.splice(found, 1);
            }
        }
    };
    WithLatestFromSubscriber.prototype.notifyComplete = function () {
        // noop
    };
    WithLatestFromSubscriber.prototype._next = function (value) {
        if (this.toRespond.length === 0) {
            var args = [value].concat(this.values);
            if (this.project) {
                this._tryProject(args);
            }
            else {
                this.destination.next(args);
            }
        }
    };
    WithLatestFromSubscriber.prototype._tryProject = function (args) {
        var result;
        try {
            result = this.project.apply(this, args);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return WithLatestFromSubscriber;
}(OuterSubscriber));

/* tslint:enable:max-line-length */
/**
 * Combines the source Observable with other Observables to create an Observable
 * whose values are calculated from the latest values of each, only when the
 * source emits.
 *
 * <span class="informal">Whenever the source Observable emits a value, it
 * computes a formula using that value plus the latest values from other input
 * Observables, then emits the output of that formula.</span>
 *
 * <img src="./img/withLatestFrom.png" width="100%">
 *
 * `withLatestFrom` combines each value from the source Observable (the
 * instance) with the latest values from the other input Observables only when
 * the source emits a value, optionally using a `project` function to determine
 * the value to be emitted on the output Observable. All input Observables must
 * emit at least one value before the output Observable will emit a value.
 *
 * @example <caption>On every click event, emit an array with the latest timer event plus the click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var timer = Rx.Observable.interval(1000);
 * var result = clicks.withLatestFrom(timer);
 * result.subscribe(x => console.log(x));
 *
 * @see {@link combineLatest}
 *
 * @param {ObservableInput} other An input Observable to combine with the source
 * Observable. More than one input Observables may be given as argument.
 * @param {Function} [project] Projection function for combining values
 * together. Receives all values in order of the Observables passed, where the
 * first parameter is a value from the source Observable. (e.g.
 * `a.withLatestFrom(b, c, (a1, b1, c1) => a1 + b1 + c1)`). If this is not
 * passed, arrays will be emitted on the output Observable.
 * @return {Observable} An Observable of projected values from the most recent
 * values from each input Observable, or an array of the most recent values from
 * each input Observable.
 * @method withLatestFrom
 * @owner Observable
 */
function withLatestFrom$$1() {
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i - 0] = arguments[_i];
    }
    return withLatestFrom$1.apply(void 0, args)(this);
}

Observable.prototype.withLatestFrom = withLatestFrom$$1;

/* tslint:enable:max-line-length */
/**
 * @param observables
 * @return {Observable<R>}
 * @method zip
 * @owner Observable
 */
function zipProto() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return zip$1.apply(void 0, observables)(this);
}

Observable.prototype.zip = zipProto;

function zipAll$1(project) {
    return function (source) { return source.lift(new ZipOperator(project)); };
}

/**
 * @param project
 * @return {Observable<R>|WebSocketSubject<T>|Observable<T>}
 * @method zipAll
 * @owner Observable
 */
function zipAll$$1(project) {
    return zipAll$1(project)(this);
}

Observable.prototype.zipAll = zipAll$$1;

var SubscriptionLog = (function () {
    function SubscriptionLog(subscribedFrame, unsubscribedFrame) {
        if (unsubscribedFrame === void 0) { unsubscribedFrame = Number.POSITIVE_INFINITY; }
        this.subscribedFrame = subscribedFrame;
        this.unsubscribedFrame = unsubscribedFrame;
    }
    return SubscriptionLog;
}());

var SubscriptionLoggable = (function () {
    function SubscriptionLoggable() {
        this.subscriptions = [];
    }
    SubscriptionLoggable.prototype.logSubscribedFrame = function () {
        this.subscriptions.push(new SubscriptionLog(this.scheduler.now()));
        return this.subscriptions.length - 1;
    };
    SubscriptionLoggable.prototype.logUnsubscribedFrame = function (index) {
        var subscriptionLogs = this.subscriptions;
        var oldSubscriptionLog = subscriptionLogs[index];
        subscriptionLogs[index] = new SubscriptionLog(oldSubscriptionLog.subscribedFrame, this.scheduler.now());
    };
    return SubscriptionLoggable;
}());

function applyMixins(derivedCtor, baseCtors) {
    for (var i = 0, len = baseCtors.length; i < len; i++) {
        var baseCtor = baseCtors[i];
        var propertyKeys = Object.getOwnPropertyNames(baseCtor.prototype);
        for (var j = 0, len2 = propertyKeys.length; j < len2; j++) {
            var name_1 = propertyKeys[j];
            derivedCtor.prototype[name_1] = baseCtor.prototype[name_1];
        }
    }
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ColdObservable = (function (_super) {
    __extends(ColdObservable, _super);
    function ColdObservable(messages, scheduler) {
        _super.call(this, function (subscriber) {
            var observable = this;
            var index = observable.logSubscribedFrame();
            subscriber.add(new Subscription(function () {
                observable.logUnsubscribedFrame(index);
            }));
            observable.scheduleMessages(subscriber);
            return subscriber;
        });
        this.messages = messages;
        this.subscriptions = [];
        this.scheduler = scheduler;
    }
    ColdObservable.prototype.scheduleMessages = function (subscriber) {
        var messagesLength = this.messages.length;
        for (var i = 0; i < messagesLength; i++) {
            var message = this.messages[i];
            subscriber.add(this.scheduler.schedule(function (_a) {
                var message = _a.message, subscriber = _a.subscriber;
                message.notification.observe(subscriber);
            }, message.frame, { message: message, subscriber: subscriber }));
        }
    };
    return ColdObservable;
}(Observable));
applyMixins(ColdObservable, [SubscriptionLoggable]);

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var HotObservable = (function (_super) {
    __extends(HotObservable, _super);
    function HotObservable(messages, scheduler) {
        _super.call(this);
        this.messages = messages;
        this.subscriptions = [];
        this.scheduler = scheduler;
    }
    /** @deprecated internal use only */ HotObservable.prototype._subscribe = function (subscriber) {
        var subject = this;
        var index = subject.logSubscribedFrame();
        subscriber.add(new Subscription(function () {
            subject.logUnsubscribedFrame(index);
        }));
        return _super.prototype._subscribe.call(this, subscriber);
    };
    HotObservable.prototype.setup = function () {
        var subject = this;
        var messagesLength = subject.messages.length;
        /* tslint:disable:no-var-keyword */
        for (var i = 0; i < messagesLength; i++) {
            (function () {
                var message = subject.messages[i];
                /* tslint:enable */
                subject.scheduler.schedule(function () { message.notification.observe(subject); }, message.frame);
            })();
        }
    };
    return HotObservable;
}(Subject));
applyMixins(HotObservable, [SubscriptionLoggable]);

var VirtualTimeScheduler = (function (_super) {
    __extends(VirtualTimeScheduler, _super);
    function VirtualTimeScheduler(SchedulerAction, maxFrames) {
        var _this = this;
        if (SchedulerAction === void 0) { SchedulerAction = VirtualAction; }
        if (maxFrames === void 0) { maxFrames = Number.POSITIVE_INFINITY; }
        _super.call(this, SchedulerAction, function () { return _this.frame; });
        this.maxFrames = maxFrames;
        this.frame = 0;
        this.index = -1;
    }
    /**
     * Prompt the Scheduler to execute all of its queued actions, therefore
     * clearing its queue.
     * @return {void}
     */
    VirtualTimeScheduler.prototype.flush = function () {
        var _a = this, actions = _a.actions, maxFrames = _a.maxFrames;
        var error, action;
        while ((action = actions.shift()) && (this.frame = action.delay) <= maxFrames) {
            if (error = action.execute(action.state, action.delay)) {
                break;
            }
        }
        if (error) {
            while (action = actions.shift()) {
                action.unsubscribe();
            }
            throw error;
        }
    };
    VirtualTimeScheduler.frameTimeFactor = 10;
    return VirtualTimeScheduler;
}(AsyncScheduler));
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var VirtualAction = (function (_super) {
    __extends(VirtualAction, _super);
    function VirtualAction(scheduler, work, index) {
        if (index === void 0) { index = scheduler.index += 1; }
        _super.call(this, scheduler, work);
        this.scheduler = scheduler;
        this.work = work;
        this.index = index;
        this.active = true;
        this.index = scheduler.index = index;
    }
    VirtualAction.prototype.schedule = function (state, delay) {
        if (delay === void 0) { delay = 0; }
        if (!this.id) {
            return _super.prototype.schedule.call(this, state, delay);
        }
        this.active = false;
        // If an action is rescheduled, we save allocations by mutating its state,
        // pushing it to the end of the scheduler queue, and recycling the action.
        // But since the VirtualTimeScheduler is used for testing, VirtualActions
        // must be immutable so they can be inspected later.
        var action = new VirtualAction(this.scheduler, this.work);
        this.add(action);
        return action.schedule(state, delay);
    };
    VirtualAction.prototype.requestAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        this.delay = scheduler.frame + delay;
        var actions = scheduler.actions;
        actions.push(this);
        actions.sort(VirtualAction.sortActions);
        return true;
    };
    VirtualAction.prototype.recycleAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        return undefined;
    };
    VirtualAction.prototype._execute = function (state, delay) {
        if (this.active === true) {
            return _super.prototype._execute.call(this, state, delay);
        }
    };
    VirtualAction.sortActions = function (a, b) {
        if (a.delay === b.delay) {
            if (a.index === b.index) {
                return 0;
            }
            else if (a.index > b.index) {
                return 1;
            }
            else {
                return -1;
            }
        }
        else if (a.delay > b.delay) {
            return 1;
        }
        else {
            return -1;
        }
    };
    return VirtualAction;
}(AsyncAction));

var defaultMaxFrame = 750;
var TestScheduler = (function (_super) {
    __extends(TestScheduler, _super);
    function TestScheduler(assertDeepEqual) {
        _super.call(this, VirtualAction, defaultMaxFrame);
        this.assertDeepEqual = assertDeepEqual;
        this.hotObservables = [];
        this.coldObservables = [];
        this.flushTests = [];
    }
    TestScheduler.prototype.createTime = function (marbles) {
        var indexOf = marbles.indexOf('|');
        if (indexOf === -1) {
            throw new Error('marble diagram for time should have a completion marker "|"');
        }
        return indexOf * TestScheduler.frameTimeFactor;
    };
    TestScheduler.prototype.createColdObservable = function (marbles, values, error) {
        if (marbles.indexOf('^') !== -1) {
            throw new Error('cold observable cannot have subscription offset "^"');
        }
        if (marbles.indexOf('!') !== -1) {
            throw new Error('cold observable cannot have unsubscription marker "!"');
        }
        var messages = TestScheduler.parseMarbles(marbles, values, error);
        var cold = new ColdObservable(messages, this);
        this.coldObservables.push(cold);
        return cold;
    };
    TestScheduler.prototype.createHotObservable = function (marbles, values, error) {
        if (marbles.indexOf('!') !== -1) {
            throw new Error('hot observable cannot have unsubscription marker "!"');
        }
        var messages = TestScheduler.parseMarbles(marbles, values, error);
        var subject = new HotObservable(messages, this);
        this.hotObservables.push(subject);
        return subject;
    };
    TestScheduler.prototype.materializeInnerObservable = function (observable, outerFrame) {
        var _this = this;
        var messages = [];
        observable.subscribe(function (value) {
            messages.push({ frame: _this.frame - outerFrame, notification: Notification.createNext(value) });
        }, function (err) {
            messages.push({ frame: _this.frame - outerFrame, notification: Notification.createError(err) });
        }, function () {
            messages.push({ frame: _this.frame - outerFrame, notification: Notification.createComplete() });
        });
        return messages;
    };
    TestScheduler.prototype.expectObservable = function (observable, unsubscriptionMarbles) {
        var _this = this;
        if (unsubscriptionMarbles === void 0) { unsubscriptionMarbles = null; }
        var actual = [];
        var flushTest = { actual: actual, ready: false };
        var unsubscriptionFrame = TestScheduler
            .parseMarblesAsSubscriptions(unsubscriptionMarbles).unsubscribedFrame;
        var subscription;
        this.schedule(function () {
            subscription = observable.subscribe(function (x) {
                var value = x;
                // Support Observable-of-Observables
                if (x instanceof Observable) {
                    value = _this.materializeInnerObservable(value, _this.frame);
                }
                actual.push({ frame: _this.frame, notification: Notification.createNext(value) });
            }, function (err) {
                actual.push({ frame: _this.frame, notification: Notification.createError(err) });
            }, function () {
                actual.push({ frame: _this.frame, notification: Notification.createComplete() });
            });
        }, 0);
        if (unsubscriptionFrame !== Number.POSITIVE_INFINITY) {
            this.schedule(function () { return subscription.unsubscribe(); }, unsubscriptionFrame);
        }
        this.flushTests.push(flushTest);
        return {
            toBe: function (marbles, values, errorValue) {
                flushTest.ready = true;
                flushTest.expected = TestScheduler.parseMarbles(marbles, values, errorValue, true);
            }
        };
    };
    TestScheduler.prototype.expectSubscriptions = function (actualSubscriptionLogs) {
        var flushTest = { actual: actualSubscriptionLogs, ready: false };
        this.flushTests.push(flushTest);
        return {
            toBe: function (marbles) {
                var marblesArray = (typeof marbles === 'string') ? [marbles] : marbles;
                flushTest.ready = true;
                flushTest.expected = marblesArray.map(function (marbles) {
                    return TestScheduler.parseMarblesAsSubscriptions(marbles);
                });
            }
        };
    };
    TestScheduler.prototype.flush = function () {
        var hotObservables = this.hotObservables;
        while (hotObservables.length > 0) {
            hotObservables.shift().setup();
        }
        _super.prototype.flush.call(this);
        var readyFlushTests = this.flushTests.filter(function (test) { return test.ready; });
        while (readyFlushTests.length > 0) {
            var test = readyFlushTests.shift();
            this.assertDeepEqual(test.actual, test.expected);
        }
    };
    TestScheduler.parseMarblesAsSubscriptions = function (marbles) {
        if (typeof marbles !== 'string') {
            return new SubscriptionLog(Number.POSITIVE_INFINITY);
        }
        var len = marbles.length;
        var groupStart = -1;
        var subscriptionFrame = Number.POSITIVE_INFINITY;
        var unsubscriptionFrame = Number.POSITIVE_INFINITY;
        for (var i = 0; i < len; i++) {
            var frame = i * this.frameTimeFactor;
            var c = marbles[i];
            switch (c) {
                case '-':
                case ' ':
                    break;
                case '(':
                    groupStart = frame;
                    break;
                case ')':
                    groupStart = -1;
                    break;
                case '^':
                    if (subscriptionFrame !== Number.POSITIVE_INFINITY) {
                        throw new Error('found a second subscription point \'^\' in a ' +
                            'subscription marble diagram. There can only be one.');
                    }
                    subscriptionFrame = groupStart > -1 ? groupStart : frame;
                    break;
                case '!':
                    if (unsubscriptionFrame !== Number.POSITIVE_INFINITY) {
                        throw new Error('found a second subscription point \'^\' in a ' +
                            'subscription marble diagram. There can only be one.');
                    }
                    unsubscriptionFrame = groupStart > -1 ? groupStart : frame;
                    break;
                default:
                    throw new Error('there can only be \'^\' and \'!\' markers in a ' +
                        'subscription marble diagram. Found instead \'' + c + '\'.');
            }
        }
        if (unsubscriptionFrame < 0) {
            return new SubscriptionLog(subscriptionFrame);
        }
        else {
            return new SubscriptionLog(subscriptionFrame, unsubscriptionFrame);
        }
    };
    TestScheduler.parseMarbles = function (marbles, values, errorValue, materializeInnerObservables) {
        if (materializeInnerObservables === void 0) { materializeInnerObservables = false; }
        if (marbles.indexOf('!') !== -1) {
            throw new Error('conventional marble diagrams cannot have the ' +
                'unsubscription marker "!"');
        }
        var len = marbles.length;
        var testMessages = [];
        var subIndex = marbles.indexOf('^');
        var frameOffset = subIndex === -1 ? 0 : (subIndex * -this.frameTimeFactor);
        var getValue = typeof values !== 'object' ?
            function (x) { return x; } :
            function (x) {
                // Support Observable-of-Observables
                if (materializeInnerObservables && values[x] instanceof ColdObservable) {
                    return values[x].messages;
                }
                return values[x];
            };
        var groupStart = -1;
        for (var i = 0; i < len; i++) {
            var frame = i * this.frameTimeFactor + frameOffset;
            var notification = void 0;
            var c = marbles[i];
            switch (c) {
                case '-':
                case ' ':
                    break;
                case '(':
                    groupStart = frame;
                    break;
                case ')':
                    groupStart = -1;
                    break;
                case '|':
                    notification = Notification.createComplete();
                    break;
                case '^':
                    break;
                case '#':
                    notification = Notification.createError(errorValue || 'error');
                    break;
                default:
                    notification = Notification.createNext(getValue(c));
                    break;
            }
            if (notification) {
                testMessages.push({ frame: groupStart > -1 ? groupStart : frame, notification: notification });
            }
        }
        return testMessages;
    };
    return TestScheduler;
}(VirtualTimeScheduler));

var RequestAnimationFrameDefinition = (function () {
    function RequestAnimationFrameDefinition(root$$1) {
        if (root$$1.requestAnimationFrame) {
            this.cancelAnimationFrame = root$$1.cancelAnimationFrame.bind(root$$1);
            this.requestAnimationFrame = root$$1.requestAnimationFrame.bind(root$$1);
        }
        else if (root$$1.mozRequestAnimationFrame) {
            this.cancelAnimationFrame = root$$1.mozCancelAnimationFrame.bind(root$$1);
            this.requestAnimationFrame = root$$1.mozRequestAnimationFrame.bind(root$$1);
        }
        else if (root$$1.webkitRequestAnimationFrame) {
            this.cancelAnimationFrame = root$$1.webkitCancelAnimationFrame.bind(root$$1);
            this.requestAnimationFrame = root$$1.webkitRequestAnimationFrame.bind(root$$1);
        }
        else if (root$$1.msRequestAnimationFrame) {
            this.cancelAnimationFrame = root$$1.msCancelAnimationFrame.bind(root$$1);
            this.requestAnimationFrame = root$$1.msRequestAnimationFrame.bind(root$$1);
        }
        else if (root$$1.oRequestAnimationFrame) {
            this.cancelAnimationFrame = root$$1.oCancelAnimationFrame.bind(root$$1);
            this.requestAnimationFrame = root$$1.oRequestAnimationFrame.bind(root$$1);
        }
        else {
            this.cancelAnimationFrame = root$$1.clearTimeout.bind(root$$1);
            this.requestAnimationFrame = function (cb) { return root$$1.setTimeout(cb, 1000 / 60); };
        }
    }
    return RequestAnimationFrameDefinition;
}());
var AnimationFrame = new RequestAnimationFrameDefinition(_root);

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var AnimationFrameAction = (function (_super) {
    __extends(AnimationFrameAction, _super);
    function AnimationFrameAction(scheduler, work) {
        _super.call(this, scheduler, work);
        this.scheduler = scheduler;
        this.work = work;
    }
    AnimationFrameAction.prototype.requestAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        // If delay is greater than 0, request as an async action.
        if (delay !== null && delay > 0) {
            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);
        }
        // Push the action to the end of the scheduler queue.
        scheduler.actions.push(this);
        // If an animation frame has already been requested, don't request another
        // one. If an animation frame hasn't been requested yet, request one. Return
        // the current animation frame request id.
        return scheduler.scheduled || (scheduler.scheduled = AnimationFrame.requestAnimationFrame(scheduler.flush.bind(scheduler, null)));
    };
    AnimationFrameAction.prototype.recycleAsyncId = function (scheduler, id, delay) {
        if (delay === void 0) { delay = 0; }
        // If delay exists and is greater than 0, or if the delay is null (the
        // action wasn't rescheduled) but was originally scheduled as an async
        // action, then recycle as an async action.
        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {
            return _super.prototype.recycleAsyncId.call(this, scheduler, id, delay);
        }
        // If the scheduler queue is empty, cancel the requested animation frame and
        // set the scheduled flag to undefined so the next AnimationFrameAction will
        // request its own.
        if (scheduler.actions.length === 0) {
            AnimationFrame.cancelAnimationFrame(id);
            scheduler.scheduled = undefined;
        }
        // Return undefined so the action knows to request a new async id if it's rescheduled.
        return undefined;
    };
    return AnimationFrameAction;
}(AsyncAction));

var AnimationFrameScheduler = (function (_super) {
    __extends(AnimationFrameScheduler, _super);
    function AnimationFrameScheduler() {
        _super.apply(this, arguments);
    }
    AnimationFrameScheduler.prototype.flush = function (action) {
        this.active = true;
        this.scheduled = undefined;
        var actions = this.actions;
        var error;
        var index = -1;
        var count = actions.length;
        action = action || actions.shift();
        do {
            if (error = action.execute(action.state, action.delay)) {
                break;
            }
        } while (++index < count && (action = actions.shift()));
        this.active = false;
        if (error) {
            while (++index < count && (action = actions.shift())) {
                action.unsubscribe();
            }
            throw error;
        }
    };
    return AnimationFrameScheduler;
}(AsyncScheduler));

/**
 *
 * Animation Frame Scheduler
 *
 * <span class="informal">Perform task when `window.requestAnimationFrame` would fire</span>
 *
 * When `animationFrame` scheduler is used with delay, it will fall back to {@link async} scheduler
 * behaviour.
 *
 * Without delay, `animationFrame` scheduler can be used to create smooth browser animations.
 * It makes sure scheduled task will happen just before next browser content repaint,
 * thus performing animations as efficiently as possible.
 *
 * @example <caption>Schedule div height animation</caption>
 * const div = document.querySelector('.some-div');
 *
 * Rx.Scheduler.schedule(function(height) {
 *   div.style.height = height + "px";
 *
 *   this.schedule(height + 1);  // `this` references currently executing Action,
 *                               // which we reschedule with new state
 * }, 0, 0);
 *
 * // You will see .some-div element growing in height
 *
 *
 * @static true
 * @name animationFrame
 * @owner Scheduler
 */
var animationFrame = new AnimationFrameScheduler(AnimationFrameAction);



var _operators = Object.freeze({
	audit: audit$1,
	auditTime: auditTime$1,
	buffer: buffer$1,
	bufferCount: bufferCount$1,
	bufferTime: bufferTime$1,
	bufferToggle: bufferToggle$1,
	bufferWhen: bufferWhen$1,
	catchError: catchError,
	combineAll: combineAll$1,
	combineLatest: combineLatest$1,
	concat: concat$2,
	concatAll: concatAll,
	concatMap: concatMap$1,
	concatMapTo: concatMapTo$1,
	count: count$1,
	debounce: debounce$1,
	debounceTime: debounceTime$1,
	defaultIfEmpty: defaultIfEmpty$1,
	delay: delay$1,
	delayWhen: delayWhen$1,
	dematerialize: dematerialize$1,
	distinct: distinct$1,
	distinctUntilChanged: distinctUntilChanged$1,
	distinctUntilKeyChanged: distinctUntilKeyChanged$1,
	elementAt: elementAt$1,
	every: every$1,
	exhaust: exhaust$1,
	exhaustMap: exhaustMap$1,
	expand: expand$1,
	filter: filter$1,
	finalize: finalize,
	find: find$1,
	findIndex: findIndex$1,
	first: first$1,
	groupBy: groupBy$1,
	ignoreElements: ignoreElements$1,
	isEmpty: isEmpty$1,
	last: last$1,
	map: map,
	mapTo: mapTo$1,
	materialize: materialize$1,
	max: max$1,
	merge: merge$2,
	mergeAll: mergeAll,
	mergeMap: mergeMap,
	flatMap: mergeMap,
	mergeMapTo: mergeMapTo$1,
	mergeScan: mergeScan$1,
	min: min$1,
	multicast: multicast$1,
	observeOn: observeOn,
	onErrorResumeNext: onErrorResumeNext$1,
	pairwise: pairwise$1,
	partition: partition$1,
	pluck: pluck$1,
	publish: publish$1,
	publishBehavior: publishBehavior$1,
	publishLast: publishLast$1,
	publishReplay: publishReplay$1,
	race: race$2,
	reduce: reduce,
	repeat: repeat$1,
	repeatWhen: repeatWhen$1,
	retry: retry$1,
	retryWhen: retryWhen$1,
	refCount: refCount,
	sample: sample$1,
	sampleTime: sampleTime$1,
	scan: scan,
	sequenceEqual: sequenceEqual$1,
	share: share$1,
	shareReplay: shareReplay$1,
	single: single$1,
	skip: skip$1,
	skipLast: skipLast$1,
	skipUntil: skipUntil$1,
	skipWhile: skipWhile$1,
	startWith: startWith$1,
	switchAll: switchAll,
	switchMap: switchMap,
	switchMapTo: switchMapTo$1,
	take: take$1,
	takeLast: takeLast,
	takeUntil: takeUntil$1,
	takeWhile: takeWhile$1,
	tap: tap,
	throttle: throttle$1,
	throttleTime: throttleTime$1,
	timeInterval: timeInterval$1,
	timeout: timeout$1,
	timeoutWith: timeoutWith$1,
	timestamp: timestamp$1,
	toArray: toArray$1,
	window: window$2,
	windowCount: windowCount$1,
	windowTime: windowTime$1,
	windowToggle: windowToggle$1,
	windowWhen: windowWhen$1,
	withLatestFrom: withLatestFrom$1,
	zip: zip$1,
	zipAll: zipAll$1
});

/* tslint:disable:no-unused-variable */
// Subject imported before Observable to bypass circular dependency issue since
// Subject extends Observable and Observable references Subject in it's
// definition
var operators = _operators;
/* tslint:enable:no-unused-variable */
/**
 * @typedef {Object} Rx.Scheduler
 * @property {Scheduler} queue Schedules on a queue in the current event frame
 * (trampoline scheduler). Use this for iteration operations.
 * @property {Scheduler} asap Schedules on the micro task queue, which uses the
 * fastest transport mechanism available, either Node.js' `process.nextTick()`
 * or Web Worker MessageChannel or setTimeout or others. Use this for
 * asynchronous conversions.
 * @property {Scheduler} async Schedules work with `setInterval`. Use this for
 * time-based operations.
 * @property {Scheduler} animationFrame Schedules work with `requestAnimationFrame`.
 * Use this for synchronizing with the platform's painting
 */
var Scheduler = {
    asap: asap,
    queue: queue,
    animationFrame: animationFrame,
    async: async
};
/**
 * @typedef {Object} Rx.Symbol
 * @property {Symbol|string} rxSubscriber A symbol to use as a property name to
 * retrieve an "Rx safe" Observer from an object. "Rx safety" can be defined as
 * an object that has all of the traits of an Rx Subscriber, including the
 * ability to add and remove subscriptions to the subscription chain and
 * guarantees involving event triggering (can't "next" after unsubscription,
 * etc).
 * @property {Symbol|string} observable A symbol to use as a property name to
 * retrieve an Observable as defined by the [ECMAScript "Observable" spec](https://github.com/zenparsing/es-observable).
 * @property {Symbol|string} iterator The ES6 symbol to use as a property name
 * to retrieve an iterator from an object.
 */
var Symbol$1 = {
    rxSubscriber: rxSubscriber,
    observable: observable,
    iterator: iterator
};

exports.operators = operators;
exports.Scheduler = Scheduler;
exports.Symbol = Symbol$1;
exports.Subject = Subject;
exports.AnonymousSubject = AnonymousSubject;
exports.Observable = Observable;
exports.Subscription = Subscription;
exports.Subscriber = Subscriber;
exports.AsyncSubject = AsyncSubject;
exports.ReplaySubject = ReplaySubject;
exports.BehaviorSubject = BehaviorSubject;
exports.ConnectableObservable = ConnectableObservable;
exports.Notification = Notification;
exports.EmptyError = EmptyError;
exports.ArgumentOutOfRangeError = ArgumentOutOfRangeError;
exports.ObjectUnsubscribedError = ObjectUnsubscribedError;
exports.TimeoutError = TimeoutError;
exports.UnsubscriptionError = UnsubscriptionError;
exports.TimeInterval = TimeInterval;
exports.Timestamp = Timestamp;
exports.TestScheduler = TestScheduler;
exports.VirtualTimeScheduler = VirtualTimeScheduler;
exports.AjaxResponse = AjaxResponse;
exports.AjaxError = AjaxError;
exports.AjaxTimeoutError = AjaxTimeoutError;
exports.pipe = pipe;

Object.defineProperty(exports, '__esModule', { value: true });

})));


