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45 lines
1.6 KiB
45 lines
1.6 KiB
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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