/** 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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