Function computeExpirationForFiber

code/new-context-api/public/app.js:12786–12828

(fiber)

  }

  function computeExpirationForFiber(fiber) {
    var expirationTime = void 0;
    if (expirationContext !== NoWork) {
      // An explicit expiration context was set;
      expirationTime = expirationContext;
    } else if (isWorking) {
      if (isCommitting) {
        // Updates that occur during the commit phase should have sync priority
        // by default.
        expirationTime = Sync;
      } else {
        // Updates during the render phase should expire at the same time as
        // the work that is being rendered.
        expirationTime = nextRenderExpirationTime;
      }
    } else {
      // No explicit expiration context was set, and we're not currently
      // performing work. Calculate a new expiration time.
      if (fiber.mode & AsyncMode) {
        if (isBatchingInteractiveUpdates) {
          // This is an interactive update
          var currentTime = recalculateCurrentTime();
          expirationTime = computeInteractiveExpiration(currentTime);
        } else {
          // This is an async update
          var _currentTime = recalculateCurrentTime();
          expirationTime = computeAsyncExpiration(_currentTime);
        }
      } else {
        // This is a sync update
        expirationTime = Sync;
      }
    }
    if (isBatchingInteractiveUpdates) {
      // This is an interactive update. Keep track of the lowest pending
      // interactive expiration time. This allows us to synchronously flush
      // all interactive updates when needed.
      if (lowestPendingInteractiveExpirationTime === NoWork || expirationTime > lowestPendingInteractiveExpirationTime) {
        lowestPendingInteractiveExpirationTime = expirationTime;
      }
    }
    return expirationTime;
  }

  function scheduleWork(fiber, expirationTime) {
    return scheduleWorkImpl(fiber, expirationTime, false);