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name : timer.js
 import { Observable } from '../Observable';
import { async as asyncScheduler } from '../scheduler/async';
import { isScheduler } from '../util/isScheduler';
import { isValidDate } from '../util/isDate';
export function timer(dueTime = 0, intervalOrScheduler, scheduler = asyncScheduler) {
    let intervalDuration = -1;
    if (intervalOrScheduler != null) {
        if (isScheduler(intervalOrScheduler)) {
            scheduler = intervalOrScheduler;
        }
        else {
            intervalDuration = intervalOrScheduler;
        }
    }
    return new Observable((subscriber) => {
        let due = isValidDate(dueTime) ? +dueTime - scheduler.now() : dueTime;
        if (due < 0) {
            due = 0;
        }
        let n = 0;
        return scheduler.schedule(function () {
            if (!subscriber.closed) {
                subscriber.next(n++);
                if (0 <= intervalDuration) {
                    this.schedule(undefined, intervalDuration);
                }
                else {
                    subscriber.complete();
                }
            }
        }, due);
    });
}
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