(function () {
    if (typeof window === 'undefined' || typeof window.CustomEvent === 'function') {
        return;
    }
    function CustomEvent(event, params) {
        params = params || { bubbles: false, cancelable: false, detail: undefined };
        var evt = document.createEvent('CustomEvent');
        evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
        return evt;
    }
    CustomEvent.prototype = window.Event.prototype;
    window.CustomEvent = CustomEvent;
})();
//# sourceMappingURL=polyfill.js.map