import { MonoTypeOperatorFunction, SchedulerLike } from 'rxjs';
/**
 * Mirrors the source Observable and makes at most `timeDelay` delay between two emissions to keep at
 * least `timeDelay` intervals while re-emitting source asap.
 *
 * @param timeDelay number
 * @param scheduler
 */
export declare const queueTime: <T>(timeDelay: number, scheduler?: SchedulerLike) => MonoTypeOperatorFunction<T>;