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share.ts
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share.ts
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import { Observable } from '../Observable';
import { share as higherOrder } from '../operators/share';
/**
* 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
*/
export function share<T>(this: Observable<T>): Observable<T> {
return higherOrder()(this) as Observable<T>;
};