Version 15.4.1

As starting Chrome 55, there is a new event `auxclick` to handle middle click, and `click` doesn't trigger by middle click anymore
https://developers.google.com/web/updates/2016/10/auxclick
EventConstructor = SyntheticPointerEvent;
        break;
      default:
        if (__DEV__) {
          if (knownHTMLTopLevelTypes.indexOf(topLevelType) === -1) {
            warningWithoutStack(
              false,
              'SimpleEventPlugin: Unhandled event type, `%s`. This warning ' +
                'is likely caused by a bug in React. Please file an issue.',
              topLevelType,
            );
          }
        }
        
        
        EventConstructor = SyntheticEvent;
        break;
    }
    const event = EventConstructor.getPooled(
      dispatchConfig,
      targetInst,
      nativeEvent,
      nativeEventTarget,
    );
    accumulateTwoPhaseDispatches(event);
    return event;
  },
};
export default SimpleEventPlugin;