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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>());
}