require-polyfills/dist/polyfill-CustomEvents.js

Collection of polyfils that load automatically using require-bundle-js by detecting what is missing in the browser.

/**
 * Extend browser support for CustomEvents all the way back to IE9.
 */
(function () {

  if ( typeof window.CustomEvent === "function" ) return false;

  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;
})();