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import { MonoTypeOperatorFunction, ObservableInput } from '../types';
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
import { innerFrom } from '../observable/innerFrom';
import { noop } from '../util/noop';
/**
* Emits the values emitted by the source Observable until a `notifier`
* Observable emits a value.
*
* <span class="informal">Lets values pass until a second Observable,
* `notifier`, emits a value. Then, it completes.</span>
*
* 
*
* `takeUntil` subscribes and begins mirroring the source Observable. It also
* monitors a second Observable, `notifier` that you provide. If the `notifier`
* emits a value, the output Observable stops mirroring the source Observable
* and completes. If the `notifier` doesn't emit any value and completes
* then `takeUntil` will pass all values.
*
* ## Example
*
* Tick every second until the first click happens
*
* ```ts
* import { interval, fromEvent, takeUntil } from 'rxjs';
*
* const source = interval(1000);
* const clicks = fromEvent(document, 'click');
* const result = source.pipe(takeUntil(clicks));
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link take}
* @see {@link takeLast}
* @see {@link takeWhile}
* @see {@link skip}
*
* @param {Observable} notifier The Observable whose first emitted value will
* cause the output Observable of `takeUntil` to stop emitting values from the
* source Observable.
* @return A function that returns an Observable that emits the values from the
* source Observable until `notifier` emits its first value.
*/
export function takeUntil<T>(notifier: ObservableInput<any>): MonoTypeOperatorFunction<T> {
return operate((source, subscriber) => {
innerFrom(notifier).subscribe(createOperatorSubscriber(subscriber, () => subscriber.complete(), noop));
!subscriber.closed && source.subscribe(subscriber);
});
}