import { Observable } from '../Observable';
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import { Operator } from '../Operator';
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import { Subscriber } from '../Subscriber';
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import { OperatorFunction } from '../types';
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/**
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* Ignores all items emitted by the source Observable and only passes calls of `complete` or `error`.
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*
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* 
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*
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* ## Examples
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* ### Ignores emitted values, reacts to observable's completion.
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* ```ts
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* import { of } from 'rxjs';
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* import { ignoreElements } from 'rxjs/operators';
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*
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* of('you', 'talking', 'to', 'me').pipe(
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* ignoreElements(),
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* )
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* .subscribe(
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* word => console.log(word),
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* err => console.log('error:', err),
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* () => console.log('the end'),
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* );
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* // result:
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* // 'the end'
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* ```
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* @return {Observable} An empty Observable that only calls `complete`
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* or `error`, based on which one is called by the source Observable.
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* @method ignoreElements
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* @owner Observable
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*/
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export function ignoreElements(): OperatorFunction<any, never> {
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return function ignoreElementsOperatorFunction(source: Observable<any>) {
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return source.lift(new IgnoreElementsOperator());
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};
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}
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class IgnoreElementsOperator<T, R> implements Operator<T, R> {
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call(subscriber: Subscriber<R>, source: any): any {
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return source.subscribe(new IgnoreElementsSubscriber(subscriber));
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}
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}
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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class IgnoreElementsSubscriber<T> extends Subscriber<T> {
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protected _next(unused: T): void {
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// Do nothing
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}
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}
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