Function unstable_next

packages/scheduler/src/forks/SchedulerPostTask.js:198–220

(callback: () => T)

}

export function unstable_next<T>(callback: () => T): T {
  let priorityLevel: PriorityLevel;
  switch (currentPriorityLevel_DEPRECATED) {
    case ImmediatePriority:
    case UserBlockingPriority:
    case NormalPriority:
      // Shift down to normal priority
      priorityLevel = NormalPriority;
      break;
    default:
      // Anything lower than normal priority should remain at the current level.
      priorityLevel = currentPriorityLevel_DEPRECATED;
      break;
  }

  const previousPriorityLevel = currentPriorityLevel_DEPRECATED;
  currentPriorityLevel_DEPRECATED = priorityLevel;
  try {
    return callback();
  } finally {
    currentPriorityLevel_DEPRECATED = previousPriorityLevel;
  }
}

export function unstable_wrapCallback<T>(callback: () => T): () => T {
  const parentPriorityLevel = currentPriorityLevel_DEPRECATED;