whole_func_string: function (obj) {
      if (obj.file && obj.file.data) {
        return obj.file.data instanceof EventEmitter;
      }
      return false;
    }
func_code_string: function (obj) {
      if (obj.file && obj.file.data) {
        return obj.file.data instanceof EventEmitter;
      }
      return false;
    }
func_documentation_string: Determine if file data is a derivative of EventEmitter class.
  https://nodejs.org/api/events.html#events_events