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-import { Observable } from '../Observable';
-import { SchedulerAction, SchedulerLike } from '../types';
-import { async } from '../scheduler/async';
-import { isNumeric } from '../util/isNumeric';
-import { isScheduler } from '../util/isScheduler';
-import { Subscriber } from '../Subscriber';
-
-/**
- * Creates an Observable that starts emitting after an `dueTime` and
- * emits ever increasing numbers after each `period` of time thereafter.
- *
- * <span class="informal">Its like {@link index/interval}, but you can specify when
- * should the emissions start.</span>
- *
- * ![](timer.png)
- *
- * `timer` returns an Observable that emits an infinite sequence of ascending
- * integers, with a constant interval of time, `period` of your choosing
- * between those emissions. The first emission happens after the specified
- * `dueTime`. The initial delay may be a `Date`. By default, this
- * operator uses the {@link asyncScheduler} {@link SchedulerLike} to provide a notion of time, but you
- * may pass any {@link SchedulerLike} to it. If `period` is not specified, the output
- * Observable emits only one value, `0`. Otherwise, it emits an infinite
- * sequence.
- *
- * ## Examples
- * ### Emits ascending numbers, one every second (1000ms), starting after 3 seconds
- * ```javascript
- * import { timer } from 'rxjs';
- *
- * const numbers = timer(3000, 1000);
- * numbers.subscribe(x => console.log(x));
- * ```
- *
- * ### Emits one number after five seconds
- * ```javascript
- * import { timer } from 'rxjs';
- *
- * const numbers = timer(5000);
- * numbers.subscribe(x => console.log(x));
- * ```
- * @see {@link index/interval}
- * @see {@link delay}
- *
- * @param {number|Date} [dueTime] The initial delay time specified as a Date object or as an integer denoting
- * milliseconds to wait before emitting the first value of 0`.
- * @param {number|SchedulerLike} [periodOrScheduler] The period of time between emissions of the
- * subsequent numbers.
- * @param {SchedulerLike} [scheduler=async] The {@link SchedulerLike} to use for scheduling
- * the emission of values, and providing a notion of "time".
- * @return {Observable} An Observable that emits a `0` after the
- * `dueTime` and ever increasing numbers after each `period` of time
- * thereafter.
- * @static true
- * @name timer
- * @owner Observable
- */
-export function timer(dueTime: number | Date = 0,
- periodOrScheduler?: number | SchedulerLike,
- scheduler?: SchedulerLike): Observable<number> {
- let period = -1;
- if (isNumeric(periodOrScheduler)) {
- period = Number(periodOrScheduler) < 1 && 1 || Number(periodOrScheduler);
- } else if (isScheduler(periodOrScheduler)) {
- scheduler = periodOrScheduler as any;
- }
-
- if (!isScheduler(scheduler)) {
- scheduler = async;
- }
-
- return new Observable(subscriber => {
- const due = isNumeric(dueTime)
- ? (dueTime as number)
- : (+dueTime - scheduler.now());
-
- return scheduler.schedule(dispatch, due, {
- index: 0, period, subscriber
- });
- });
-}
-
-interface TimerState {
- index: number;
- period: number;
- subscriber: Subscriber<number>;
-}
-
-function dispatch(this: SchedulerAction<TimerState>, state: TimerState) {
- const { index, period, subscriber } = state;
- subscriber.next(index);
-
- if (subscriber.closed) {
- return;
- } else if (period === -1) {
- return subscriber.complete();
- }
-
- state.index = index + 1;
- this.schedule(state, period);
-}