Function beginWork

dash/deps/react-dom@18.2.0.js:21526–21719

(current, workInProgress, renderLanes)

  }

  function beginWork(current, workInProgress, renderLanes) {
    {
      if (workInProgress._debugNeedsRemount && current !== null) {
        // This will restart the begin phase with a new fiber.
        return remountFiber(current, workInProgress, createFiberFromTypeAndProps(workInProgress.type, workInProgress.key, workInProgress.pendingProps, workInProgress._debugOwner || null, workInProgress.mode, workInProgress.lanes));
      }
    }

    if (current !== null) {
      var oldProps = current.memoizedProps;
      var newProps = workInProgress.pendingProps;

      if (oldProps !== newProps || hasContextChanged() || ( // Force a re-render if the implementation changed due to hot reload:
       workInProgress.type !== current.type )) {
        // If props or context changed, mark the fiber as having performed work.
        // This may be unset if the props are determined to be equal later (memo).
        didReceiveUpdate = true;
      } else {
        // Neither props nor legacy context changes. Check if there's a pending
        // update or context change.
        var hasScheduledUpdateOrContext = checkScheduledUpdateOrContext(current, renderLanes);

        if (!hasScheduledUpdateOrContext && // If this is the second pass of an error or suspense boundary, there
        // may not be work scheduled on `current`, so we check for this flag.
        (workInProgress.flags & DidCapture) === NoFlags) {
          // No pending updates or context. Bail out now.
          didReceiveUpdate = false;
          return attemptEarlyBailoutIfNoScheduledUpdate(current, workInProgress, renderLanes);
        }

        if ((current.flags & ForceUpdateForLegacySuspense) !== NoFlags) {
          // This is a special case that only exists for legacy mode.
          // See https://github.com/facebook/react/pull/19216.
          didReceiveUpdate = true;
        } else {
          // An update was scheduled on this fiber, but there are no new props
          // nor legacy context. Set this to false. If an update queue or context
          // consumer produces a changed value, it will set this to true. Otherwise,
          // the component will assume the children have not changed and bail out.
          didReceiveUpdate = false;
        }
      }
    } else {
      didReceiveUpdate = false;

      if (getIsHydrating() && isForkedChild(workInProgress)) {
        // Check if this child belongs to a list of muliple children in
        // its parent.
        //
        // In a true multi-threaded implementation, we would render children on
        // parallel threads. This would represent the beginning of a new render
        // thread for this subtree.
        //
        // We only use this for id generation during hydration, which is why the
        // logic is located in this special branch.
        var slotIndex = workInProgress.index;
        var numberOfForks = getForksAtLevel();
        pushTreeId(workInProgress, numberOfForks, slotIndex);