Function requestWork

code/new-context-api/public/app.js:12967–12994

(root, expirationTime)

  // requestWork is called by the scheduler whenever a root receives an update.
  // It's up to the renderer to call renderRoot at some point in the future.
  function requestWork(root, expirationTime) {
    addRootToSchedule(root, expirationTime);

    if (isRendering) {
      // Prevent reentrancy. Remaining work will be scheduled at the end of
      // the currently rendering batch.
      return;
    }

    if (isBatchingUpdates) {
      // Flush work at the end of the batch.
      if (isUnbatchingUpdates) {
        // ...unless we're inside unbatchedUpdates, in which case we should
        // flush it now.
        nextFlushedRoot = root;
        nextFlushedExpirationTime = Sync;
        performWorkOnRoot(root, Sync, false);
      }
      return;
    }

    // TODO: Get rid of Sync and use current time?
    if (expirationTime === Sync) {
      performSyncWork();
    } else {
      scheduleCallbackWithExpiration(expirationTime);
    }
  }

  function addRootToSchedule(root, expirationTime) {
    // Add the root to the schedule.