Function performUnitOfWork

lib/assets/react-source/development/react.js:25838–25865

(unitOfWork)

	}

	function performUnitOfWork(unitOfWork) {
	  // 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 = unitOfWork.alternate;
	  startWorkTimer(unitOfWork);
	  setCurrentFiber(unitOfWork);
	  var next;

	  if ( (unitOfWork.mode & ProfileMode) !== NoMode) {
	    startProfilerTimer(unitOfWork);
	    next = beginWork$1(current, unitOfWork, renderExpirationTime$1);
	    stopProfilerTimerIfRunningAndRecordDelta(unitOfWork, true);
	  } else {
	    next = beginWork$1(current, unitOfWork, renderExpirationTime$1);
	  }

	  resetCurrentFiber();
	  unitOfWork.memoizedProps = unitOfWork.pendingProps;

	  if (next === null) {
	    // If this doesn't spawn new work, complete the current work.
	    next = completeUnitOfWork(unitOfWork);
	  }

	  ReactCurrentOwner$2.current = null;
	  return next;
	}

	function completeUnitOfWork(unitOfWork) {
	  // Attempt to complete the current unit of work, then move to the next