docs: function clone(item) {
            if (!foundFirst && selectedKeys.indexOf(item.key) !== -1 || !foundFirst && !selectedKeys.length && firstActiveValue.indexOf(item.key) !== -1) {
              foundFirst = true;
              return Object(__WEBPACK_IMPORTED_MODULE_4_react__["cloneElement"])(item, {
                ref: function ref(_ref) {
                  _this2.firstActiveItem = _ref;
                }
              });
            }
            return item;
          }