Function completeUnitOfWork

lib/assets/react-source/development/react.js:25867–25998

(unitOfWork)

	}

	function completeUnitOfWork(unitOfWork) {
	  // 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.
	  workInProgress = unitOfWork;

	  do {
	    // 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;
	    var returnFiber = workInProgress.return; // Check if the work completed or if something threw.

	    if ((workInProgress.effectTag & Incomplete) === NoEffect) {
	      setCurrentFiber(workInProgress);
	      var next = void 0;

	      if ( (workInProgress.mode & ProfileMode) === NoMode) {
	        next = completeWork(current, workInProgress, renderExpirationTime$1);
	      } else {
	        startProfilerTimer(workInProgress);
	        next = completeWork(current, workInProgress, renderExpirationTime$1); // Update render duration assuming we didn't error.

	        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);
	      }

	      stopWorkTimer(workInProgress);
	      resetCurrentFiber();
	      resetChildExpirationTime(workInProgress);

	      if (next !== null) {
	        // Completing this fiber spawned new work. Work on that next.
	        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.


	        var effectTag = workInProgress.effectTag; // Skip both NoWork and PerformedWork tags when creating the effect