Function updateSimpleMemoComponent

dash/deps/react-dom@18.3.1.js:19382–19465

(current, workInProgress, Component, nextProps, renderLanes)

  }

  function updateSimpleMemoComponent(current, workInProgress, Component, nextProps, renderLanes) {
    // TODO: current can be non-null here even if the component
    // hasn't yet mounted. This happens when the inner render suspends.
    // We'll need to figure out if this is fine or can cause issues.
    {
      if (workInProgress.type !== workInProgress.elementType) {
        // Lazy component props can't be validated in createElement
        // because they're only guaranteed to be resolved here.
        var outerMemoType = workInProgress.elementType;

        if (outerMemoType.$$typeof === REACT_LAZY_TYPE) {
          // We warn when you define propTypes on lazy()
          // so let's just skip over it to find memo() outer wrapper.
          // Inner props for memo are validated later.
          var lazyComponent = outerMemoType;
          var payload = lazyComponent._payload;
          var init = lazyComponent._init;

          try {
            outerMemoType = init(payload);
          } catch (x) {
            outerMemoType = null;
          } // Inner propTypes will be validated in the function component path.


          var outerPropTypes = outerMemoType && outerMemoType.propTypes;

          if (outerPropTypes) {
            checkPropTypes(outerPropTypes, nextProps, // Resolved (SimpleMemoComponent has no defaultProps)
            'prop', getComponentNameFromType(outerMemoType));
          }
        }
      }
    }

    if (current !== null) {
      var prevProps = current.memoizedProps;

      if (shallowEqual(prevProps, nextProps) && current.ref === workInProgress.ref && ( // Prevent bailout if the implementation changed due to hot reload.
       workInProgress.type === current.type )) {
        didReceiveUpdate = false; // The props are shallowly equal. Reuse the previous props object, like we
        // would during a normal fiber bailout.
        //
        // We don't have strong guarantees that the props object is referentially
        // equal during updates where we can't bail out anyway — like if the props
        // are shallowly equal, but there's a local state or context update in the
        // same batch.
        //
        // However, as a principle, we should aim to make the behavior consistent
        // across different ways of memoizing a component. For example, React.memo
        // has a different internal Fiber layout if you pass a normal function
        // component (SimpleMemoComponent) versus if you pass a different type
        // like forwardRef (MemoComponent). But this is an implementation detail.
        // Wrapping a component in forwardRef (or React.lazy, etc) shouldn't
        // affect whether the props object is reused during a bailout.

        workInProgress.pendingProps = nextProps = prevProps;