Create custom event in a cross-browser manner. Works in IE >= 9

get-custom-event.js

/**
 * @param {String} name - The event's name
 * @param {Object} [options] - Options to pass to the event constructor
 * @returns Custom event
 */
function getCustomEvent (name, options = {}) {
  let event;

  if (typeof window.CustomEvent === 'function') {
    event = new CustomEvent(name, options);
  } else {
    event = document.createEvent('CustomEvent');
    event.initCustomEvent(
      name,
      options.bubbles,
      options.cancellable,
      options.detail
    );
  }
  
  return event;
}