code: function () {
              /*  determine parameters  */
              var params = $cs.params("unawait", arguments, {
                  id: { pos: 0, req: true }
              });
  
              /*  unsubscribe from service event if it is not yet unsubscribed  */
              if (this._subscription(params.id))
                  this.unsubscribe(params.id);
              return;
          }
docs: /*  unawait a state