var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var isNumeric_1 = require('../util/isNumeric');
var Observable_1 = require('../Observable');
var asap_1 = require('../scheduler/asap');
var IntervalObservable = (function (_super) {
    __extends(IntervalObservable, _super);
    function IntervalObservable(period, scheduler) {
        if (period === void 0) { period = 0; }
        if (scheduler === void 0) { scheduler = asap_1.asap; }
        _super.call(this);
        this.period = period;
        this.scheduler = scheduler;
        if (!isNumeric_1.isNumeric(period) || period < 0) {
            this.period = 0;
        }
        if (!scheduler || typeof scheduler.schedule !== 'function') {
            this.scheduler = asap_1.asap;
        }
    }
    IntervalObservable.create = function (period, scheduler) {
        if (period === void 0) { period = 0; }
        if (scheduler === void 0) { scheduler = asap_1.asap; }
        return new IntervalObservable(period, scheduler);
    };
    IntervalObservable.dispatch = function (state) {
        var index = state.index, subscriber = state.subscriber, period = state.period;
        subscriber.next(index);
        if (subscriber.isUnsubscribed) {
            return;
        }
        state.index += 1;
        this.schedule(state, period);
    };
    IntervalObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var period = this.period;
        var scheduler = this.scheduler;
        subscriber.add(scheduler.schedule(IntervalObservable.dispatch, period, {
            index: index, subscriber: subscriber, period: period
        }));
    };
    return IntervalObservable;
})(Observable_1.Observable);
exports.IntervalObservable = IntervalObservable;
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