Function processUpdateQueue

docs/external/js/react-dom.development.js:12457–12616

(workInProgress, props, instance, renderExpirationTime)

  }

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

    {
      currentlyProcessingQueue = queue.shared;
    } // The last rebase update that is NOT part of the base state.


    var baseQueue = queue.baseQueue; // The last pending update that hasn't been processed yet.

    var pendingQueue = queue.shared.pending;

    if (pendingQueue !== null) {
      // We have new updates that haven't been processed yet.
      // We'll add them to the base queue.
      if (baseQueue !== null) {
        // Merge the pending queue and the base queue.
        var baseFirst = baseQueue.next;
        var pendingFirst = pendingQueue.next;
        baseQueue.next = pendingFirst;
        pendingQueue.next = baseFirst;
      }

      baseQueue = pendingQueue;
      queue.shared.pending = null; // TODO: Pass `current` as argument

      var current = workInProgress.alternate;

      if (current !== null) {
        var currentQueue = current.updateQueue;

        if (currentQueue !== null) {
          currentQueue.baseQueue = pendingQueue;
        }
      }
    } // These values may change as we process the queue.


    if (baseQueue !== null) {
      var first = baseQueue.next; // Iterate through the list of updates to compute the result.

      var newState = queue.baseState;
      var newExpirationTime = NoWork;
      var newBaseState = null;
      var newBaseQueueFirst = null;
      var newBaseQueueLast = null;

      if (first !== null) {
        var update = first;

        do {
          var updateExpirationTime = update.expirationTime;

          if (updateExpirationTime < renderExpirationTime) {
            // Priority is insufficient. Skip this update. If this is the first
            // skipped update, the previous update/state is the new base