docs: function(event, listener, domID) {
      var returnValue = EventPluginUtils.executeDispatch(event, listener, domID);
  
      ("production" !== process.env.NODE_ENV ? warning(
        typeof returnValue !== 'boolean',
        'Returning `false` from an event handler is deprecated and will be ' +
        'ignored in a future release. Instead, manually call ' +
        'e.stopPropagation() or e.preventDefault(), as appropriate.'
      ) : null);
  
      if (returnValue === false) {
        event.stopPropagation();
        event.preventDefault();
      }
    }