code: function Recognizer(options) {
      this.options = assign({}, this.defaults, options || {});
  
      this.id = uniqueId();
  
      this.manager = null;
  
      // default is enable true
      this.options.enable = ifUndefined(this.options.enable, true);
  
      this.state = STATE_POSSIBLE;
  
      this.simultaneous = {};
      this.requireFail = [];
  }
docs: Recognizer
  Every recognizer needs to extend from this class.
  @constructor
  @param {Object} options