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import { OperatorFunction, ObservableInput, ObservedValueOf } from '../types';
import { exhaustMap } from './exhaustMap';
import { identity } from '../util/identity';
/**
* Converts a higher-order Observable into a first-order Observable by dropping
* inner Observables while the previous inner Observable has not yet completed.
*
* <span class="informal">Flattens an Observable-of-Observables by dropping the
* next inner Observables while the current inner is still executing.</span>
*
* 
*
* `exhaustAll` subscribes to an Observable that emits Observables, also known as a
* higher-order Observable. Each time it observes one of these emitted inner
* Observables, the output Observable begins emitting the items emitted by that
* inner Observable. So far, it behaves like {@link mergeAll}. However,
* `exhaustAll` ignores every new inner Observable if the previous Observable has
* not yet completed. Once that one completes, it will accept and flatten the
* next inner Observable and repeat this process.
*
* ## Example
*
* Run a finite timer for each click, only if there is no currently active timer
*
* ```ts
* import { fromEvent, map, interval, take, exhaustAll } from 'rxjs';
*
* const clicks = fromEvent(document, 'click');
* const higherOrder = clicks.pipe(
* map(() => interval(1000).pipe(take(5)))
* );
* const result = higherOrder.pipe(exhaustAll());
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link combineLatestAll}
* @see {@link concatAll}
* @see {@link switchAll}
* @see {@link switchMap}
* @see {@link mergeAll}
* @see {@link exhaustMap}
* @see {@link zipAll}
*
* @return A function that returns an Observable that takes a source of
* Observables and propagates the first Observable exclusively until it
* completes before subscribing to the next.
*/
export function exhaustAll<O extends ObservableInput<any>>(): OperatorFunction<O, ObservedValueOf<O>> {
return exhaustMap(identity);
}