Function CustomEvent

src/polyfill.js:5–15

(event, params)

    return;

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

  window.CustomEvent = CustomEvent;
})();