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node_modules/rxjs/src/observable/NeverObservable.ts
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EvgeniyBudaev
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17 фев 2020, 09:02
17 фев 2020, 09:02
bb6f06f
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import { Observable } from '../Observable'; import { Subscriber } from '../Subscriber'; import { noop } from '../util/noop'; /** * We need this JSDoc comment for affecting ESDoc. * @extends {Ignored} * @hide true */ export class NeverObservable<T> extends Observable<T> { /** * 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 */ static create<T>() { return new NeverObservable<T>(); } constructor() { super(); } /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>): void { noop(); } }