app/assets/javascripts/commons/polyfills/custom_event.js


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if (typeof window.CustomEvent !== 'function') {
  window.CustomEvent = function CustomEvent(event, params) {
    const evt = document.createEvent('CustomEvent');
    const evtParams = Object.assign({}, params, {
      bubbles: false,
      cancelable: false,
      detail: undefined,
    });
    evt.initCustomEvent(event, evtParams.bubbles, evtParams.cancelable, evtParams.detail);
    return evt;
  };
  window.CustomEvent.prototype = Event;
}