Function ref

docs/external/js/react-dom.development.js:13503–13516

(value)

        }

        var ref = function (value) {
          var refs = inst.refs;

          if (refs === emptyRefsObject) {
            // This is a lazy pooled frozen object, so we need to initialize.
            refs = inst.refs = {};
          }

          if (value === null) {
            delete refs[stringRef];
          } else {
            refs[stringRef] = value;
          }
        };

        ref._stringRef = stringRef;
        return ref;