Function completeUnitOfWork

code/third-party/public/app.js:12303–12447

(workInProgress)

  }

  function completeUnitOfWork(workInProgress) {
    // Attempt to complete the current unit of work, then move to the
    // next sibling. If there are no more siblings, return to the
    // parent fiber.
    while (true) {
      // The current, flushed, state of this fiber is the alternate.
      // Ideally nothing should rely on this, but relying on it here
      // means that we don't need an additional field on the work in
      // progress.
      var current = workInProgress.alternate;
      {
        ReactDebugCurrentFiber.setCurrentFiber(workInProgress);
      }

      var returnFiber = workInProgress['return'];
      var siblingFiber = workInProgress.sibling;

      if ((workInProgress.effectTag & Incomplete) === NoEffect) {
        // This fiber completed.
        var next = completeWork(current, workInProgress, nextRenderExpirationTime);
        stopWorkTimer(workInProgress);
        resetExpirationTime(workInProgress, nextRenderExpirationTime);
        {
          ReactDebugCurrentFiber.resetCurrentFiber();
        }

        if (next !== null) {
          stopWorkTimer(workInProgress);
          if (true && ReactFiberInstrumentation_1.debugTool) {
            ReactFiberInstrumentation_1.debugTool.onCompleteWork(workInProgress);
          }
          // If completing this work spawned new work, do that next. We'll come
          // back here again.
          return next;
        }

        if (returnFiber !== null &&
        // Do not append effects to parents if a sibling failed to complete
        (returnFiber.effectTag & Incomplete) === NoEffect) {
          // Append all the effects of the subtree and this fiber onto the effect
          // list of the parent. The completion order of the children affects the
          // side-effect order.
          if (returnFiber.firstEffect === null) {
            returnFiber.firstEffect = workInProgress.firstEffect;
          }
          if (workInProgress.lastEffect !== null) {
            if (returnFiber.lastEffect !== null) {
              returnFiber.lastEffect.nextEffect = workInProgress.firstEffect;
            }
            returnFiber.lastEffect = workInProgress.lastEffect;
          }

          // If this fiber had side-effects, we append it AFTER the children's
          // side-effects. We can perform certain side-effects earlier if
          // needed, by doing multiple passes over the effect list. We don't want
          // to schedule our own side-effect on our own list because if end up
          // reusing children we'll schedule this effect onto itself since we're
          // at the end.