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import { MonoTypeOperatorFunction, ObservableInput } from '../types';
/**
* Emits a notification from the source Observable only after a particular time span
* determined by another Observable has passed without another source emission.
*
* <span class="informal">It's like {@link debounceTime}, but the time span of
* emission silence is determined by a second Observable.</span>
* ![](debounce.png)
* `debounce` delays notifications emitted by the source Observable, but drops previous
* pending delayed emissions if a new notification arrives on the source Observable.
* This operator keeps track of the most recent notification from the source
* Observable, and spawns a duration Observable by calling the
* `durationSelector` function. The notification is emitted only when the duration
* Observable emits a next notification, and if no other notification was emitted on
* the source Observable since the duration Observable was spawned. If a new
* notification appears before the duration Observable emits, the previous notification will
* not be emitted and a new duration is scheduled from `durationSelector` is scheduled.
* If the completing event happens during the scheduled duration the last cached notification
* is emitted before the completion event is forwarded to the output observable.
* If the error event happens during the scheduled duration or after it only the error event is
* forwarded to the output observable. The cache notification is not emitted in this case.
* Like {@link debounceTime}, this is a rate-limiting operator, and also a
* delay-like operator since output emissions do not necessarily occur at the
* same time as they did on the source Observable.
* ## Example
* Emit the most recent click after a burst of clicks
* ```ts
* import { fromEvent, interval } from 'rxjs';
* import { scan, debounce } from 'rxjs/operators';
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* scan((i) => ++i, 1),
* debounce((i) => interval(200 * i))
* );
* result.subscribe(x => console.log(x));
* ```
* @see {@link audit}
* @see {@link auditTime}
* @see {@link debounce}
* @see {@link delay}
* @see {@link sample}
* @see {@link sampleTime}
* @see {@link throttle}
* @see {@link throttleTime}
* @param durationSelector A function
* that receives a value from the source Observable, for computing the timeout
* duration for each source value, returned as an Observable or a Promise.
* @return A function that returns an Observable that delays the emissions of
* the source Observable by the specified duration Observable returned by
* `durationSelector`, and may drop some values if they occur too frequently.
*/
export declare function debounce<T>(durationSelector: (value: T) => ObservableInput<any>): MonoTypeOperatorFunction<T>;
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