Function updateMemoComponent

docs/external/js/react-dom.development.js:16974–17051

(current, workInProgress, Component, nextProps, updateExpirationTime, renderExpirationTime)

  }

  function updateMemoComponent(current, workInProgress, Component, nextProps, updateExpirationTime, renderExpirationTime) {
    if (current === null) {
      var type = Component.type;

      if (isSimpleFunctionComponent(type) && Component.compare === null && // SimpleMemoComponent codepath doesn't resolve outer props either.
      Component.defaultProps === undefined) {
        var resolvedType = type;

        {
          resolvedType = resolveFunctionForHotReloading(type);
        } // If this is a plain function component without default props,
        // and with only the default shallow comparison, we upgrade it
        // to a SimpleMemoComponent to allow fast path updates.


        workInProgress.tag = SimpleMemoComponent;
        workInProgress.type = resolvedType;

        {
          validateFunctionComponentInDev(workInProgress, type);
        }

        return updateSimpleMemoComponent(current, workInProgress, resolvedType, nextProps, updateExpirationTime, renderExpirationTime);
      }

      {
        var innerPropTypes = type.propTypes;

        if (innerPropTypes) {
          // Inner memo component props aren't currently validated in createElement.
          // We could move it there, but we'd still need this for lazy code path.
          checkPropTypes_1(innerPropTypes, nextProps, // Resolved props
          'prop', getComponentName(type), getCurrentFiberStackInDev);
        }
      }

      var child = createFiberFromTypeAndProps(Component.type, null, nextProps, null, workInProgress.mode, renderExpirationTime);
      child.ref = workInProgress.ref;
      child.return = workInProgress;
      workInProgress.child = child;
      return child;
    }

    {
      var _type = Component.type;
      var _innerPropTypes = _type.propTypes;

      if (_innerPropTypes) {
        // Inner memo component props aren't currently validated in createElement.
        // We could move it there, but we'd still need this for lazy code path.
        checkPropTypes_1(_innerPropTypes, nextProps, // Resolved props
        'prop', getComponentName(_type), getCurrentFiberStackInDev);
      }
    }

    var currentChild = current.child; // This is always exactly one child

    if (updateExpirationTime < renderExpirationTime) {