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node_modules/rxjs/src/operators/publish.ts
30 строк
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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 { Subject } from '../Subject'; import { multicast } from './multicast'; import { ConnectableObservable } from '../observable/ConnectableObservable'; import { MonoTypeOperatorFunction, OperatorFunction, UnaryFunction } from '../interfaces'; /* tslint:disable:max-line-length */ export function publish<T>(): UnaryFunction<Observable<T>, ConnectableObservable<T>>; export function publish<T>(selector: MonoTypeOperatorFunction<T>): MonoTypeOperatorFunction<T>; export function publish<T, R>(selector: OperatorFunction<T, R>): OperatorFunction<T, R>; /* 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 */ export function publish<T, R>(selector?: OperatorFunction<T, R>): MonoTypeOperatorFunction<T> | OperatorFunction<T, R> { return selector ? multicast(() => new Subject<T>(), selector) : multicast(new Subject<T>()); }