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import { Observable } from '../Observable';
import { OperatorFunction } from '../types';
/**
* Branch out the source Observable values as a nested Observable whenever
* `windowBoundaries` emits.
*
* <span class="informal">It's like {@link buffer}, but emits a nested Observable
* instead of an array.</span>
*
* 
*
* Returns an Observable that emits windows of items it collects from the source
* Observable. The output Observable emits connected, non-overlapping
* windows. It emits the current window and opens a new one whenever the
* Observable `windowBoundaries` emits an item. Because each window is an
* Observable, the output is a higher-order Observable.
*
* ## Example
* In every window of 1 second each, emit at most 2 click events
* ```javascript
* import { fromEvent, interval } from 'rxjs';
* import { window, mergeAll, map take } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const sec = interval(1000);
* const result = clicks.pipe(
* window(sec),
* map(win => win.pipe(take(2))), // each window has at most 2 emissions
* mergeAll(), // flatten the Observable-of-Observables
* );
* result.subscribe(x => console.log(x));
* ```
* @see {@link windowCount}
* @see {@link windowTime}
* @see {@link windowToggle}
* @see {@link windowWhen}
* @see {@link buffer}
*
* @param {Observable<any>} windowBoundaries An Observable that completes the
* previous window and starts a new window.
* @return {Observable<Observable<T>>} An Observable of windows, which are
* Observables emitting values of the source Observable.
* @method window
* @owner Observable
*/
export declare function window<T>(windowBoundaries: Observable<any>): OperatorFunction<T, Observable<T>>;
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