import { Observable } from '../Observable';
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import { SchedulerLike } from '../types';
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/**
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* Creates an Observable that starts emitting after an `dueTime` and
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* emits ever increasing numbers after each `period` of time thereafter.
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*
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* <span class="informal">Its like {@link index/interval}, but you can specify when
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* should the emissions start.</span>
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*
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* 
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*
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* `timer` returns an Observable that emits an infinite sequence of ascending
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* integers, with a constant interval of time, `period` of your choosing
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* between those emissions. The first emission happens after the specified
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* `dueTime`. The initial delay may be a `Date`. By default, this
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* operator uses the {@link asyncScheduler} {@link SchedulerLike} to provide a notion of time, but you
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* may pass any {@link SchedulerLike} to it. If `period` is not specified, the output
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* Observable emits only one value, `0`. Otherwise, it emits an infinite
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* sequence.
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*
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* ## Examples
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* ### Emits ascending numbers, one every second (1000ms), starting after 3 seconds
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* ```ts
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* import { timer } from 'rxjs';
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*
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* const numbers = timer(3000, 1000);
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* numbers.subscribe(x => console.log(x));
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* ```
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*
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* ### Emits one number after five seconds
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* ```ts
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* import { timer } from 'rxjs';
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*
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* const numbers = timer(5000);
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* numbers.subscribe(x => console.log(x));
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* ```
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* @see {@link index/interval}
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* @see {@link delay}
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*
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* @param {number|Date} [dueTime] The initial delay time specified as a Date object or as an integer denoting
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* milliseconds to wait before emitting the first value of 0`.
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* @param {number|SchedulerLike} [periodOrScheduler] The period of time between emissions of the
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* subsequent numbers.
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* @param {SchedulerLike} [scheduler=async] The {@link SchedulerLike} to use for scheduling
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* the emission of values, and providing a notion of "time".
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* @return {Observable} An Observable that emits a `0` after the
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* `dueTime` and ever increasing numbers after each `period` of time
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* thereafter.
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* @static true
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* @name timer
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* @owner Observable
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*/
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export declare function timer(dueTime?: number | Date, periodOrScheduler?: number | SchedulerLike, scheduler?: SchedulerLike): Observable<number>;
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