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50 lines
2.3 KiB
50 lines
2.3 KiB
import { MonoTypeOperatorFunction, SubscribableOrPromise } from '../types'; |
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/** |
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* Emits a value from the source Observable only after a particular time span |
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* determined by another Observable has passed without another source emission. |
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* |
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* <span class="informal">It's like {@link debounceTime}, but the time span of |
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* emission silence is determined by a second Observable.</span> |
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* |
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*  |
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* |
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* `debounce` delays values emitted by the source Observable, but drops previous |
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* pending delayed emissions if a new value arrives on the source Observable. |
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* This operator keeps track of the most recent value from the source |
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* Observable, and spawns a duration Observable by calling the |
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* `durationSelector` function. The value is emitted only when the duration |
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* Observable emits a value or completes, and if no other value was emitted on |
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* the source Observable since the duration Observable was spawned. If a new |
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* value appears before the duration Observable emits, the previous value will |
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* be dropped and will not be emitted on the output Observable. |
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* |
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* Like {@link debounceTime}, this is a rate-limiting operator, and also a |
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* delay-like operator since output emissions do not necessarily occur at the |
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* same time as they did on the source Observable. |
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* |
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* ## Example |
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* Emit the most recent click after a burst of clicks |
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* ```ts |
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* import { fromEvent, interval } from 'rxjs'; |
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* import { debounce } from 'rxjs/operators'; |
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* |
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* const clicks = fromEvent(document, 'click'); |
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* const result = clicks.pipe(debounce(() => interval(1000))); |
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* result.subscribe(x => console.log(x)); |
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* ``` |
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* |
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* @see {@link audit} |
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* @see {@link debounceTime} |
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* @see {@link delayWhen} |
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* @see {@link throttle} |
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* |
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* @param {function(value: T): SubscribableOrPromise} durationSelector A function |
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* that receives a value from the source Observable, for computing the timeout |
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* duration for each source value, returned as an Observable or a Promise. |
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* @return {Observable} An Observable that delays the emissions of the source |
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* Observable by the specified duration Observable returned by |
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* `durationSelector`, and may drop some values if they occur too frequently. |
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* @method debounce |
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* @owner Observable |
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*/ |
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export declare function debounce<T>(durationSelector: (value: T) => SubscribableOrPromise<any>): MonoTypeOperatorFunction<T>;
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