rxjs-pausable/dist/lib/rxjs-pausable.js

A RxJS pipable operator to pause and resume streams

import { Observable, NEVER, BehaviorSubject } from 'rxjs';
import { switchMap, materialize, dematerialize } from 'rxjs/operators';

/*! *****************************************************************************
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 = function(d, b) {
    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]; };
    return extendStatics(d, b);
};

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

var PausableObservable = /** @class */ (function (_super) {
    __extends(PausableObservable, _super);
    function PausableObservable() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    PausableObservable.prototype.pause = function () {
        this.pauser.next(true);
    };
    PausableObservable.prototype.resume = function () {
        this.pauser.next(false);
    };
    return PausableObservable;
}(Observable));
function pausable() {
    return function pauseFn(source) {
        var pausableProto = PausableObservable.prototype;
        var pauser = new BehaviorSubject(false);
        var newSource = pauser.pipe(switchMap(function (paused) { return (paused ? NEVER : source.pipe(materialize())); }), dematerialize());
        var pausable = Object.create(newSource, {
            pause: { value: pausableProto.pause },
            resume: { value: pausableProto.resume },
            pauser: { value: pauser }
        });
        return pausable;
    };
}

export { PausableObservable, pausable };
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