Function work

packages/scheduler/src/__tests__/SchedulerMock-test.js:202–211

()

      ['D', 100],
    ];
    const work = () => {
      while (tasks.length > 0) {
        const [label, ms] = tasks.shift();
        Scheduler.unstable_advanceTime(ms);
        Scheduler.log(label);
        if (shouldYield()) {
          return work;
        }
      }
    };

    // Schedule a high priority callback
    scheduleCallback(UserBlockingPriority, work);