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