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49 lines
2.2 KiB
49 lines
2.2 KiB
2 years ago
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import { SubscribableOrPromise } from '../Observable';
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import { MonoTypeOperatorFunction } from '../interfaces';
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export interface ThrottleConfig {
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leading?: boolean;
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trailing?: boolean;
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}
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export declare const defaultThrottleConfig: ThrottleConfig;
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/**
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* Emits a value from the source Observable, then ignores subsequent source
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* values for a duration determined by another Observable, then repeats this
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* process.
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*
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* <span class="informal">It's like {@link throttleTime}, but the silencing
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* duration is determined by a second Observable.</span>
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*
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* <img src="./img/throttle.png" width="100%">
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*
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* `throttle` emits the source Observable values on the output Observable
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* when its internal timer is disabled, and ignores source values when the timer
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* is enabled. Initially, the timer is disabled. As soon as the first source
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* value arrives, it is forwarded to the output Observable, and then the timer
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* is enabled by calling the `durationSelector` function with the source value,
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* which returns the "duration" Observable. When the duration Observable emits a
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* value or completes, the timer is disabled, and this process repeats for the
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* next source value.
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*
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* @example <caption>Emit clicks at a rate of at most one click per second</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = clicks.throttle(ev => Rx.Observable.interval(1000));
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* result.subscribe(x => console.log(x));
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*
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* @see {@link audit}
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* @see {@link debounce}
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* @see {@link delayWhen}
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* @see {@link sample}
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* @see {@link throttleTime}
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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 silencing
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* duration for each source value, returned as an Observable or a Promise.
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* @param {Object} config a configuration object to define `leading` and `trailing` behavior. Defaults
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* to `{ leading: true, trailing: false }`.
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* @return {Observable<T>} An Observable that performs the throttle operation to
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* limit the rate of emissions from the source.
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* @method throttle
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* @owner Observable
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*/
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export declare function throttle<T>(durationSelector: (value: T) => SubscribableOrPromise<number>, config?: ThrottleConfig): MonoTypeOperatorFunction<T>;
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