timer.js•1.24 kB
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, intervalOrScheduler, scheduler) {
if (dueTime === void 0) { dueTime = 0; }
if (scheduler === void 0) { scheduler = asyncScheduler; }
var intervalDuration = -1;
if (intervalOrScheduler != null) {
if (isScheduler(intervalOrScheduler)) {
scheduler = intervalOrScheduler;
}
else {
intervalDuration = intervalOrScheduler;
}
}
return new Observable(function (subscriber) {
var due = isValidDate(dueTime) ? +dueTime - scheduler.now() : dueTime;
if (due < 0) {
due = 0;
}
var 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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