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import { IScheduler } from '../Scheduler';
import { Observable } from '../Observable';
/**
* 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>
*
* <img src="./img/windowTime.png" width="100%">
*
* 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.
*
* @example <caption>In every window of 1 second each, emit at most 2 click events</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.windowTime(1000)
* .map(win => win.take(2)) // each window has at most 2 emissions
* .mergeAll(); // flatten the Observable-of-Observables
* result.subscribe(x => console.log(x));
*
* @example <caption>Every 5 seconds start a window 1 second long, and emit at most 2 click events per window</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.windowTime(1000, 5000)
* .map(win => win.take(2)) // each window has at most 2 emissions
* .mergeAll(); // flatten the Observable-of-Observables
* result.subscribe(x => console.log(x));
*
* @example <caption>Same as example above but with maxWindowCount instead of take</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.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 {Scheduler} [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>(this: Observable<T>, windowTimeSpan: number, scheduler?: IScheduler): Observable<Observable<T>>;
export declare function windowTime<T>(this: Observable<T>, windowTimeSpan: number, windowCreationInterval: number, scheduler?: IScheduler): Observable<Observable<T>>;
export declare function windowTime<T>(this: Observable<T>, windowTimeSpan: number, windowCreationInterval: number, maxWindowSize: number, scheduler?: IScheduler): Observable<Observable<T>>;