Function shouldYield

code/composition/public/app.js:14022–14033

()

  // When working on async work, the reconciler asks the renderer if it should
  // yield execution. For DOM, we implement this with requestIdleCallback.
  function shouldYield() {
    if (deadline === null) {
      return false;
    }
    if (deadline.timeRemaining() > timeHeuristicForUnitOfWork) {
      // Disregard deadline.didTimeout. Only expired work should be flushed
      // during a timeout. This path is only hit for non-expired work.
      return false;
    }
    deadlineDidExpire = true;
    return true;
  }

  function onUncaughtError(error) {
    !(nextFlushedRoot !== null) ? invariant(false, 'Should be working on a root. This error is likely caused by a bug in React. Please file an issue.') : void 0;