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import { Observable } from '../Observable';
import { OperatorFunction } from '../types';
/**
* Branch out the source Observable values as a nested Observable starting from
* an emission from `openings` and ending when the output of `closingSelector`
* emits.
*
* <span class="informal">It's like {@link bufferToggle}, 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 windows that contain those items
* emitted by the source Observable between the time when the `openings`
* Observable emits an item and when the Observable returned by
* `closingSelector` emits an item.
*
* ## Example
* Every other second, emit the click events from the next 500ms
* ```javascript
* import { fromEvent, interval } from 'rxjs';
* import { windowToggle, mergeAll } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const openings = interval(1000);
* const result = clicks.pipe(
* windowToggle(openings, i => i % 2 ? interval(500) : empty()),
* mergeAll(),
* );
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link window}
* @see {@link windowCount}
* @see {@link windowTime}
* @see {@link windowWhen}
* @see {@link bufferToggle}
*
* @param {Observable<O>} openings An observable of notifications to start new
* windows.
* @param {function(value: O): Observable} closingSelector A function that takes
* the value emitted by the `openings` observable and returns an Observable,
* which, when it emits (either `next` or `complete`), signals that the
* associated window should complete.
* @return {Observable<Observable<T>>} An observable of windows, which in turn
* are Observables.
* @method windowToggle
* @owner Observable
*/
export declare function windowToggle<T, O>(openings: Observable<O>, closingSelector: (openValue: O) => Observable<any>): OperatorFunction<T, Observable<T>>;
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