1 import { Operator } from '../Operator';
2 import { Subscriber } from '../Subscriber';
3 import { Subscription } from '../Subscription';
4 import { Observable } from '../Observable';
5 import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
8 * Returns an Observable that mirrors the source Observable, but will call a specified function when
9 * the source terminates on complete or error.
10 * @param {function} callback Function to be called when source terminates.
11 * @return {Observable} An Observable that mirrors the source, but will call the specified function on termination.
15 export function finalize<T>(callback: () => void): MonoTypeOperatorFunction<T> {
16 return (source: Observable<T>) => source.lift(new FinallyOperator(callback));
19 class FinallyOperator<T> implements Operator<T, T> {
20 constructor(private callback: () => void) {
23 call(subscriber: Subscriber<T>, source: any): TeardownLogic {
24 return source.subscribe(new FinallySubscriber(subscriber, this.callback));
29 * We need this JSDoc comment for affecting ESDoc.
33 class FinallySubscriber<T> extends Subscriber<T> {
34 constructor(destination: Subscriber<T>, callback: () => void) {
36 this.add(new Subscription(callback));