Function memo

dash/deps/react@18.2.0.js:1537–1575

(type, compare)

  }

  function memo(type, compare) {
    {
      if (!isValidElementType(type)) {
        error('memo: The first argument must be a component. Instead ' + 'received: %s', type === null ? 'null' : typeof type);
      }
    }

    var elementType = {
      $$typeof: REACT_MEMO_TYPE,
      type: type,
      compare: compare === undefined ? null : compare
    };

    {
      var ownName;
      Object.defineProperty(elementType, 'displayName', {
        enumerable: false,
        configurable: true,
        get: function () {
          return ownName;
        },
        set: function (name) {
          ownName = name; // The inner component shouldn't inherit this display name in most cases,
          // because the component may be used elsewhere.
          // But it's nice for anonymous functions to inherit the name,
          // so that our component-stack generation logic will display their frames.
          // An anonymous function generally suggests a pattern like:
          //   React.memo((props) => {...});
          // This kind of inner function is not used elsewhere so the side effect is okay.

          if (!type.name && !type.displayName) {
            type.displayName = name;
          }
        }
      });
    }

    return elementType;
  }

  function resolveDispatcher() {
    var dispatcher = ReactCurrentDispatcher.current;