'use strict';
var 
  tmpEvent,
  createEvent,
  createWithConstructor,
  createWithInit;

createWithConstructor = function( name, descriptor ) {
  return new CustomEvent( name, descriptor );
};

createWithInit = function( name, descriptor={} ) {
  var 
    event = document.createEvent( "CustomEvent" ),
    {
      bubbles,
      cancelable,
      detail
    } = descriptor;

  event.initCustomEvent(
    name,
    typeof bubbles === "boolean" ? bubbles : true,
    typeof cancelable === "boolean" ? cancelable : true,
    detail || {}
  );

  return event;
};

// check if supported via try/catch
if ( window ) {
  try {
    tmpEvent = new CustomEvent( "test" );
    createEvent = createWithConstructor;
  } catch ( error ) {
    // use fallback method
    createEvent = createWithInit;
  }
}

// ES6 export
export default createEvent;