|  | import { MonoTypeOperatorFunction, SchedulerLike } from '../types'; | 
|  | /** | 
|  | * Delays the emission of items from the source Observable by a given timeout or | 
|  | * until a given Date. | 
|  | * | 
|  | * <span class="informal">Time shifts each item by some specified amount of | 
|  | * milliseconds.</span> | 
|  | * | 
|  | *  | 
|  | * | 
|  | * If the delay argument is a Number, this operator time shifts the source | 
|  | * Observable by that amount of time expressed in milliseconds. The relative | 
|  | * time intervals between the values are preserved. | 
|  | * | 
|  | * If the delay argument is a Date, this operator time shifts the start of the | 
|  | * Observable execution until the given date occurs. | 
|  | * | 
|  | * ## Examples | 
|  | * Delay each click by one second | 
|  | * ```ts | 
|  | * import { fromEvent } from 'rxjs'; | 
|  | * import { delay } from 'rxjs/operators'; | 
|  | * | 
|  | * const clicks = fromEvent(document, 'click'); | 
|  | * const delayedClicks = clicks.pipe(delay(1000)); // each click emitted after 1 second | 
|  | * delayedClicks.subscribe(x => console.log(x)); | 
|  | * ``` | 
|  | * | 
|  | * Delay all clicks until a future date happens | 
|  | * ```ts | 
|  | * import { fromEvent } from 'rxjs'; | 
|  | * import { delay } from 'rxjs/operators'; | 
|  | * | 
|  | * const clicks = fromEvent(document, 'click'); | 
|  | * const date = new Date('March 15, 2050 12:00:00'); // in the future | 
|  | * const delayedClicks = clicks.pipe(delay(date)); // click emitted only after that date | 
|  | * delayedClicks.subscribe(x => console.log(x)); | 
|  | * ``` | 
|  | * | 
|  | * @see {@link debounceTime} | 
|  | * @see {@link delayWhen} | 
|  | * | 
|  | * @param {number|Date} delay The delay duration in milliseconds (a `number`) or | 
|  | * a `Date` until which the emission of the source items is delayed. | 
|  | * @param {SchedulerLike} [scheduler=async] The {@link SchedulerLike} to use for | 
|  | * managing the timers that handle the time-shift for each item. | 
|  | * @return {Observable} An Observable that delays the emissions of the source | 
|  | * Observable by the specified timeout or Date. | 
|  | * @method delay | 
|  | * @owner Observable | 
|  | */ | 
|  | export declare function delay<T>(delay: number | Date, scheduler?: SchedulerLike): MonoTypeOperatorFunction<T>; |