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/** PURE_IMPORTS_START _Observable,_scheduler_async,_util_isNumeric PURE_IMPORTS_END */
import { Observable } from '../Observable';
import { async } from '../scheduler/async';
import { isNumeric } from '../util/isNumeric';
export function interval(period, scheduler) {
if (period === void 0) {
period = 0;
}
if (scheduler === void 0) {
scheduler = async;
}
if (!isNumeric(period) || period < 0) {
period = 0;
}
if (!scheduler || typeof scheduler.schedule !== 'function') {
scheduler = async;
}
return new Observable(function (subscriber) {
subscriber.add(scheduler.schedule(dispatch, period, { subscriber: subscriber, counter: 0, period: period }));
return subscriber;
});
}
function dispatch(state) {
var subscriber = state.subscriber, counter = state.counter, period = state.period;
subscriber.next(counter);
this.schedule({ subscriber: subscriber, counter: counter + 1, period: period }, period);
}
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