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