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- import { Observable } from '../Observable';
- /**
- * 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>
- *
- * <img src="./img/exhaust.png" width="100%">
- *
- * `exhaust` 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,
- * `exhaust` 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 <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
- * var clicks = Rx.Observable.fromEvent(document, 'click');
- * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(5));
- * var result = higherOrder.exhaust();
- * result.subscribe(x => console.log(x));
- *
- * @see {@link combineAll}
- * @see {@link concatAll}
- * @see {@link switch}
- * @see {@link mergeAll}
- * @see {@link exhaustMap}
- * @see {@link zipAll}
- *
- * @return {Observable} An Observable that takes a source of Observables and propagates the first observable
- * exclusively until it completes before subscribing to the next.
- * @method exhaust
- * @owner Observable
- */
- export declare function exhaust<T>(this: Observable<T>): Observable<T>;
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