function evented(target) {
  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
  var eventBusKey = options.eventBusKey;

  // Set or create the eventBusEl_.

  if (eventBusKey) {
    if (!target[eventBusKey].nodeName) {
      throw new Error('The eventBusKey "' + eventBusKey + '" does not refer to an element.');
    }
    target.eventBusEl_ = target[eventBusKey];
  } else {
    target.eventBusEl_ = createEl('span', { className: 'vjs-event-bus' });
  }

  assign(target, EventedMixin);

  // When any evented object is disposed, it removes all its listeners.
  target.on('dispose', function () {
    return target.off();
  });

  return target;
}