import { Observable } from '../Observable';
import { Scheduler } from '../Scheduler';
/**
 * Returns the source Observable delayed by the computed debounce duration,
 * with the duration lengthened if a new source item arrives before the delay
 * duration ends.
 * In practice, for each item emitted on the source, this operator holds the
 * latest item, waits for a silence for the `dueTime` length, and only then
 * emits the latest source item on the result Observable.
 * Optionally takes a scheduler for manging timers.
 * @param {number} dueTime the timeout value for the window of time required to not drop the item.
 * @param {Scheduler} [scheduler] the Scheduler to use for managing the timers that handle the timeout for each item.
 * @returns {Observable} an Observable the same as source Observable, but drops items.
 */
export declare function debounceTime<T>(dueTime: number, scheduler?: Scheduler): Observable<T>;