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import { Observable } from '../Observable';
import { OperatorFunction, SchedulerLike } from '../types';
/**
* Branch out the source Observable values as a nested Observable periodically
* in time.
*
* <span class="informal">It's like {@link bufferTime}, 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 starts a new window periodically, as
* determined by the `windowCreationInterval` argument. It emits each window
* after a fixed timespan, specified by the `windowTimeSpan` argument. When the
* source Observable completes or encounters an error, the output Observable
* emits the current window and propagates the notification from the source
* Observable. If `windowCreationInterval` is not provided, the output
* Observable starts a new window when the previous window of duration
* `windowTimeSpan` completes. If `maxWindowCount` is provided, each window
* will emit at most fixed number of values. Window will complete immediately
* after emitting last value and next one still will open as specified by
* `windowTimeSpan` and `windowCreationInterval` arguments.
*
* ## Examples
* In every window of 1 second each, emit at most 2 click events
* ```ts
* import { fromEvent } from 'rxjs';
* import { windowTime, map, mergeAll, take } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* windowTime(1000),
* 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));
* ```
*
* Every 5 seconds start a window 1 second long, and emit at most 2 click events per window
* ```ts
* import { fromEvent } from 'rxjs';
* import { windowTime, map, mergeAll, take } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* windowTime(1000, 5000),
* 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));
* ```
*
* Same as example above but with maxWindowCount instead of take
* ```ts
* import { fromEvent } from 'rxjs';
* import { windowTime, mergeAll } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* windowTime(1000, 5000, 2), // each window has still at most 2 emissions
* mergeAll(), // flatten the Observable-of-Observables
* );
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link window}
* @see {@link windowCount}
* @see {@link windowToggle}
* @see {@link windowWhen}
* @see {@link bufferTime}
*
* @param {number} windowTimeSpan The amount of time to fill each window.
* @param {number} [windowCreationInterval] The interval at which to start new
* windows.
* @param {number} [maxWindowSize=Number.POSITIVE_INFINITY] Max number of
* values each window can emit before completion.
* @param {SchedulerLike} [scheduler=async] The scheduler on which to schedule the
* intervals that determine window boundaries.
* @return {Observable<Observable<T>>} An observable of windows, which in turn
* are Observables.
* @method windowTime
* @owner Observable
*/
export declare function windowTime<T>(windowTimeSpan: number, scheduler?: SchedulerLike): OperatorFunction<T, Observable<T>>;
export declare function windowTime<T>(windowTimeSpan: number, windowCreationInterval: number, scheduler?: SchedulerLike): OperatorFunction<T, Observable<T>>;
export declare function windowTime<T>(windowTimeSpan: number, windowCreationInterval: number, maxWindowSize: number, scheduler?: SchedulerLike): OperatorFunction<T, Observable<T>>;