if (typeof window !== 'undefined') {
	(function () {
		if (typeof window['CustomEvent'] === 'function') {
			return false;
		}

		function CustomEvent(event, params) {
			params = params || {
				bubbles: false,
				cancelable: false,
				detail: undefined,
			};
			const evt = document.createEvent('CustomEvent');
			evt.initCustomEvent(
				event,
				params.bubbles,
				params.cancelable,
				params.detail
			);
			return evt;
		}

		CustomEvent.prototype = window['Event'].prototype;
		window['CustomEvent'] = CustomEvent as any;
	})();

	// Avoid multiple instances of babel-polyfill
	function idempotentBabelPolyfill() {
		if (
			(typeof global !== 'undefined' && !global['_babelPolyfill']) ||
			!window['_babelPolyfill']
		) {
			return require('babel-polyfill');
		}

		return null;
	}

	idempotentBabelPolyfill();
}