Function processUpdateQueue

dash/deps/react-dom@18.3.1.js:14851–15039

(workInProgress, props, instance, renderLanes)

  }

  function processUpdateQueue(workInProgress, props, instance, renderLanes) {
    // This is always non-null on a ClassComponent or HostRoot
    var queue = workInProgress.updateQueue;
    hasForceUpdate = false;

    {
      currentlyProcessingQueue = queue.shared;
    }

    var firstBaseUpdate = queue.firstBaseUpdate;
    var lastBaseUpdate = queue.lastBaseUpdate; // Check if there are pending updates. If so, transfer them to the base queue.

    var pendingQueue = queue.shared.pending;

    if (pendingQueue !== null) {
      queue.shared.pending = null; // The pending queue is circular. Disconnect the pointer between first
      // and last so that it's non-circular.

      var lastPendingUpdate = pendingQueue;
      var firstPendingUpdate = lastPendingUpdate.next;
      lastPendingUpdate.next = null; // Append pending updates to base queue

      if (lastBaseUpdate === null) {
        firstBaseUpdate = firstPendingUpdate;
      } else {
        lastBaseUpdate.next = firstPendingUpdate;
      }

      lastBaseUpdate = lastPendingUpdate; // If there's a current queue, and it's different from the base queue, then
      // we need to transfer the updates to that queue, too. Because the base
      // queue is a singly-linked list with no cycles, we can append to both
      // lists and take advantage of structural sharing.
      // TODO: Pass `current` as argument

      var current = workInProgress.alternate;

      if (current !== null) {
        // This is always non-null on a ClassComponent or HostRoot
        var currentQueue = current.updateQueue;
        var currentLastBaseUpdate = currentQueue.lastBaseUpdate;

        if (currentLastBaseUpdate !== lastBaseUpdate) {
          if (currentLastBaseUpdate === null) {
            currentQueue.firstBaseUpdate = firstPendingUpdate;
          } else {
            currentLastBaseUpdate.next = firstPendingUpdate;
          }

          currentQueue.lastBaseUpdate = lastPendingUpdate;
        }
      }
    } // These values may change as we process the queue.


    if (firstBaseUpdate !== null) {
      // Iterate through the list of updates to compute the result.
      var newState = queue.baseState; // TODO: Don't need to accumulate this. Instead, we can remove renderLanes
      // from the original lanes.