51 lines
2.3 KiB
TypeScript
51 lines
2.3 KiB
TypeScript
|
import { MonoTypeOperatorFunction, SubscribableOrPromise } from '../types';
|
||
|
|
/**
|
||
|
|
* Emits a value 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` delays values emitted by the source Observable, but drops previous
|
||
|
|
* pending delayed emissions if a new value arrives on the source Observable.
|
||
|
|
* This operator keeps track of the most recent value from the source
|
||
|
|
* Observable, and spawns a duration Observable by calling the
|
||
|
|
* `durationSelector` function. The value is emitted only when the duration
|
||
|
|
* Observable emits a value or completes, and if no other value was emitted on
|
||
|
|
* the source Observable since the duration Observable was spawned. If a new
|
||
|
|
* value appears before the duration Observable emits, the previous value will
|
||
|
|
* be dropped and will not be emitted on the output Observable.
|
||
|
|
*
|
||
|
|
* 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 { debounce } from 'rxjs/operators';
|
||
|
|
*
|
||
|
|
* const clicks = fromEvent(document, 'click');
|
||
|
|
* const result = clicks.pipe(debounce(() => interval(1000)));
|
||
|
|
* result.subscribe(x => console.log(x));
|
||
|
|
* ```
|
||
|
|
*
|
||
|
|
* @see {@link audit}
|
||
|
|
* @see {@link debounceTime}
|
||
|
|
* @see {@link delayWhen}
|
||
|
|
* @see {@link throttle}
|
||
|
|
*
|
||
|
|
* @param {function(value: T): SubscribableOrPromise} 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 {Observable} 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.
|
||
|
|
* @method debounce
|
||
|
|
* @owner Observable
|
||
|
|
*/
|
||
|
|
export declare function debounce<T>(durationSelector: (value: T) => SubscribableOrPromise<any>): MonoTypeOperatorFunction<T>;
|