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55 lines
2.4 KiB
TypeScript
55 lines
2.4 KiB
TypeScript
import { MonoTypeOperatorFunction, SchedulerLike } 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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* has passed without another source emission.
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*
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* <span class="informal">It's like {@link delay}, but passes only the most
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* recent value from each burst of emissions.</span>
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*
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* 
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*
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* `debounceTime` delays values emitted by the source Observable, but drops
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* previous pending delayed emissions if a new value arrives on the source
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* Observable. This operator keeps track of the most recent value from the
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* source Observable, and emits that only when `dueTime` enough time has passed
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* without any other value appearing on the source Observable. If a new value
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* appears before `dueTime` silence occurs, the previous value will be dropped
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* and will not be emitted on the output Observable.
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*
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* This is a rate-limiting operator, because it is impossible for more than one
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* value to be emitted in any time window of duration `dueTime`, but it is also
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* a delay-like operator since output emissions do not occur at the same time as
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* they did on the source Observable. Optionally takes a {@link SchedulerLike} for
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* managing timers.
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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 } from 'rxjs';
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* import { debounceTime } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(debounceTime(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 auditTime}
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* @see {@link debounce}
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* @see {@link delay}
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* @see {@link sampleTime}
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* @see {@link throttleTime}
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*
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* @param {number} dueTime The timeout duration in milliseconds (or the time
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* unit determined internally by the optional `scheduler`) for the window of
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* time required to wait for emission silence before emitting the most recent
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* source value.
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* @param {SchedulerLike} [scheduler=async] The {@link SchedulerLike} to use for
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* managing the timers that handle the timeout for each value.
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* @return {Observable} An Observable that delays the emissions of the source
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* Observable by the specified `dueTime`, and may drop some values if they occur
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* too frequently.
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* @method debounceTime
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* @owner Observable
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*/
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export declare function debounceTime<T>(dueTime: number, scheduler?: SchedulerLike): MonoTypeOperatorFunction<T>;
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