Function performUnitOfWork

docs/external/js/react-dom.development.js:22278–22305

(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