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46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
import { Observable } from '../Observable';
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import { OperatorFunction } from '../types';
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/**
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* Buffers the source Observable values, using a factory function of closing
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* Observables to determine when to close, emit, and reset the buffer.
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*
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* <span class="informal">Collects values from the past as an array. When it
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* starts collecting values, it calls a function that returns an Observable that
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* tells when to close the buffer and restart collecting.</span>
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*
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* 
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*
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* Opens a buffer immediately, then closes the buffer when the observable
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* returned by calling `closingSelector` function emits a value. When it closes
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* the buffer, it immediately opens a new buffer and repeats the process.
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*
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* ## Example
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*
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* Emit an array of the last clicks every [1-5] random seconds
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*
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* ```ts
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* import { fromEvent, interval } from 'rxjs';
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* import { bufferWhen } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const buffered = clicks.pipe(bufferWhen(() =>
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* interval(1000 + Math.random() * 4000)
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* ));
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* buffered.subscribe(x => console.log(x));
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* ```
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*
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*
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* @see {@link buffer}
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* @see {@link bufferCount}
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* @see {@link bufferTime}
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* @see {@link bufferToggle}
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* @see {@link windowWhen}
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*
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* @param {function(): Observable} closingSelector A function that takes no
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* arguments and returns an Observable that signals buffer closure.
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* @return {Observable<T[]>} An observable of arrays of buffered values.
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* @method bufferWhen
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* @owner Observable
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*/
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export declare function bufferWhen<T>(closingSelector: () => Observable<any>): OperatorFunction<T, T[]>;
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