react/compiled/facebook-www/Scheduler-dev.classic.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @noflow
 * @nolint
 * @preventMunge
 * @preserve-invariant-messages
 */

"use strict";

if (__DEV__) {
  (function () {
    "use strict";

    /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
    if (
      typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== "undefined" &&
      typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart ===
        "function"
    ) {
      __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());
    }
    // $FlowFixMe[cannot-resolve-module]
    var dynamicFeatureFlags = require("SchedulerFeatureFlags");

    var enableProfilingFeatureFlag = dynamicFeatureFlags.enableProfiling;
    var userBlockingPriorityTimeout =
        dynamicFeatureFlags.userBlockingPriorityTimeout,
      normalPriorityTimeout = dynamicFeatureFlags.normalPriorityTimeout,
      lowPriorityTimeout = dynamicFeatureFlags.lowPriorityTimeout,
      enableIsInputPending = dynamicFeatureFlags.enableIsInputPending,
      enableIsInputPendingContinuous =
        dynamicFeatureFlags.enableIsInputPendingContinuous,
      frameYieldMs = dynamicFeatureFlags.frameYieldMs,
      continuousYieldMs = dynamicFeatureFlags.continuousYieldMs,
      maxYieldMs = dynamicFeatureFlags.maxYieldMs;
    var enableProfiling = enableProfilingFeatureFlag;

    function push(heap, node) {
      var index = heap.length;
      heap.push(node);
      siftUp(heap, node, index);
    }
    function peek(heap) {
      return heap.length === 0 ? null : heap[0];
    }
    function pop(heap) {
      if (heap.length === 0) {
        return null;
      }

      var first = heap[0];
      var last = heap.pop();

      if (last !== first) {
        heap[0] = last;
        siftDown(heap, last, 0);
      }

      return first;
    }

    function siftUp(heap, node, i) {
      var index = i;

      while (index > 0) {
        var parentIndex = (index - 1) >>> 1;
        var parent = heap[parentIndex];

        if (compare(parent, node) > 0) {
          // The parent is larger. Swap positions.
          heap[parentIndex] = node;
          heap[index] = parent;
          index = parentIndex;
        } else {
          // The parent is smaller. Exit.
          return;
        }
      }
    }

    function siftDown(heap, node, i) {
      var index = i;
      var length = heap.length;
      var halfLength = length >>> 1;

      while (index < halfLength) {
        var leftIndex = (index + 1) * 2 - 1;
        var left = heap[leftIndex];
        var rightIndex = leftIndex + 1;
        var right = heap[rightIndex]; // If the left or right node is smaller, swap with the smaller of those.

        if (compare(left, node) < 0) {
          if (rightIndex < length && compare(right, left) < 0) {
            heap[index] = right;
            heap[rightIndex] = node;
            index = rightIndex;
          } else {
            heap[index] = left;
            heap[leftIndex] = node;
            index = leftIndex;
          }
        } else if (rightIndex < length && compare(right, node) < 0) {
          heap[index] = right;
          heap[rightIndex] = node;
          index = rightIndex;
        } else {
          // Neither child is smaller. Exit.
          return;
        }
      }
    }

    function compare(a, b) {
      // Compare sort index first, then task id.
      var diff = a.sortIndex - b.sortIndex;
      return diff !== 0 ? diff : a.id - b.id;
    }

    // TODO: Use symbols?
    var ImmediatePriority = 1;
    var UserBlockingPriority = 2;
    var NormalPriority = 3;
    var LowPriority = 4;
    var IdlePriority = 5;

    var runIdCounter = 0;
    var mainThreadIdCounter = 0; // Bytes per element is 4

    var INITIAL_EVENT_LOG_SIZE = 131072;
    var MAX_EVENT_LOG_SIZE = 524288; // Equivalent to 2 megabytes

    var eventLogSize = 0;
    var eventLogBuffer = null;
    var eventLog = null;
    var eventLogIndex = 0;
    var TaskStartEvent = 1;
    var TaskCompleteEvent = 2;
    var TaskErrorEvent = 3;
    var TaskCancelEvent = 4;
    var TaskRunEvent = 5;
    var TaskYieldEvent = 6;
    var SchedulerSuspendEvent = 7;
    var SchedulerResumeEvent = 8;

    function logEvent(entries) {
      if (eventLog !== null) {
        var offset = eventLogIndex;
        eventLogIndex += entries.length;

        if (eventLogIndex + 1 > eventLogSize) {
          eventLogSize *= 2;

          if (eventLogSize > MAX_EVENT_LOG_SIZE) {
            // Using console['error'] to evade Babel and ESLint
            console["error"](
              "Scheduler Profiling: Event log exceeded maximum size. Don't " +
                "forget to call `stopLoggingProfilingEvents()`."
            );
            stopLoggingProfilingEvents();
            return;
          }

          var newEventLog = new Int32Array(eventLogSize * 4); // $FlowFixMe[incompatible-call] found when upgrading Flow

          newEventLog.set(eventLog);
          eventLogBuffer = newEventLog.buffer;
          eventLog = newEventLog;
        }

        eventLog.set(entries, offset);
      }
    }

    function startLoggingProfilingEvents() {
      eventLogSize = INITIAL_EVENT_LOG_SIZE;
      eventLogBuffer = new ArrayBuffer(eventLogSize * 4);
      eventLog = new Int32Array(eventLogBuffer);
      eventLogIndex = 0;
    }
    function stopLoggingProfilingEvents() {
      var buffer = eventLogBuffer;
      eventLogSize = 0;
      eventLogBuffer = null;
      eventLog = null;
      eventLogIndex = 0;
      return buffer;
    }
    function markTaskStart(task, ms) {
      if (enableProfiling) {
        if (eventLog !== null) {
          // performance.now returns a float, representing milliseconds. When the
          // event is logged, it's coerced to an int. Convert to microseconds to
          // maintain extra degrees of precision.
          logEvent([TaskStartEvent, ms * 1000, task.id, task.priorityLevel]);
        }
      }
    }
    function markTaskCompleted(task, ms) {
      if (enableProfiling) {
        if (eventLog !== null) {
          logEvent([TaskCompleteEvent, ms * 1000, task.id]);
        }
      }
    }
    function markTaskCanceled(task, ms) {
      if (enableProfiling) {
        if (eventLog !== null) {
          logEvent([TaskCancelEvent, ms * 1000, task.id]);
        }
      }
    }
    function markTaskErrored(task, ms) {
      if (enableProfiling) {
        if (eventLog !== null) {
          logEvent([TaskErrorEvent, ms * 1000, task.id]);
        }
      }
    }
    function markTaskRun(task, ms) {
      if (enableProfiling) {
        runIdCounter++;

        if (eventLog !== null) {
          logEvent([TaskRunEvent, ms * 1000, task.id, runIdCounter]);
        }
      }
    }
    function markTaskYield(task, ms) {
      if (enableProfiling) {
        if (eventLog !== null) {
          logEvent([TaskYieldEvent, ms * 1000, task.id, runIdCounter]);
        }
      }
    }
    function markSchedulerSuspended(ms) {
      if (enableProfiling) {
        mainThreadIdCounter++;

        if (eventLog !== null) {
          logEvent([SchedulerSuspendEvent, ms * 1000, mainThreadIdCounter]);
        }
      }
    }
    function markSchedulerUnsuspended(ms) {
      if (enableProfiling) {
        if (eventLog !== null) {
          logEvent([SchedulerResumeEvent, ms * 1000, mainThreadIdCounter]);
        }
      }
    }

    /* eslint-disable no-var */
    exports.unstable_now = void 0;
    var hasPerformanceNow = // $FlowFixMe[method-unbinding]
      typeof performance === "object" && typeof performance.now === "function";

    if (hasPerformanceNow) {
      var localPerformance = performance;

      exports.unstable_now = function () {
        return localPerformance.now();
      };
    } else {
      var localDate = Date;
      var initialTime = localDate.now();

      exports.unstable_now = function () {
        return localDate.now() - initialTime;
      };
    } // Max 31 bit integer. The max integer size in V8 for 32-bit systems.
    // Math.pow(2, 30) - 1
    // 0b111111111111111111111111111111

    var maxSigned31BitInt = 1073741823; // Tasks are stored on a min heap

    var taskQueue = [];
    var timerQueue = []; // Incrementing id counter. Used to maintain insertion order.

    var taskIdCounter = 1; // Pausing the scheduler is useful for debugging.

    var isSchedulerPaused = false;
    var currentTask = null;
    var currentPriorityLevel = NormalPriority; // This is set while performing work, to prevent re-entrance.

    var isPerformingWork = false;
    var isHostCallbackScheduled = false;
    var isHostTimeoutScheduled = false; // Capture local references to native APIs, in case a polyfill overrides them.

    var localSetTimeout = typeof setTimeout === "function" ? setTimeout : null;
    var localClearTimeout =
      typeof clearTimeout === "function" ? clearTimeout : null;
    var localSetImmediate =
      typeof setImmediate !== "undefined" ? setImmediate : null; // IE and Node.js + jsdom

    var isInputPending =
      typeof navigator !== "undefined" && // $FlowFixMe[prop-missing]
      navigator.scheduling !== undefined && // $FlowFixMe[incompatible-type]
      navigator.scheduling.isInputPending !== undefined
        ? navigator.scheduling.isInputPending.bind(navigator.scheduling)
        : null;
    var continuousOptions = {
      includeContinuous: enableIsInputPendingContinuous
    };

    function advanceTimers(currentTime) {
      // Check for tasks that are no longer delayed and add them to the queue.
      var timer = peek(timerQueue);

      while (timer !== null) {
        if (timer.callback === null) {
          // Timer was cancelled.
          pop(timerQueue);
        } else if (timer.startTime <= currentTime) {
          // Timer fired. Transfer to the task queue.
          pop(timerQueue);
          timer.sortIndex = timer.expirationTime;
          push(taskQueue, timer);

          if (enableProfiling) {
            markTaskStart(timer, currentTime);
            timer.isQueued = true;
          }
        } else {
          // Remaining timers are pending.
          return;
        }

        timer = peek(timerQueue);
      }
    }

    function handleTimeout(currentTime) {
      isHostTimeoutScheduled = false;
      advanceTimers(currentTime);

      if (!isHostCallbackScheduled) {
        if (peek(taskQueue) !== null) {
          isHostCallbackScheduled = true;
          requestHostCallback();
        } else {
          var firstTimer = peek(timerQueue);

          if (firstTimer !== null) {
            requestHostTimeout(
              handleTimeout,
              firstTimer.startTime - currentTime
            );
          }
        }
      }
    }

    function flushWork(initialTime) {
      if (enableProfiling) {
        markSchedulerUnsuspended(initialTime);
      } // We'll need a host callback the next time work is scheduled.

      isHostCallbackScheduled = false;

      if (isHostTimeoutScheduled) {
        // We scheduled a timeout but it's no longer needed. Cancel it.
        isHostTimeoutScheduled = false;
        cancelHostTimeout();
      }

      isPerformingWork = true;
      var previousPriorityLevel = currentPriorityLevel;

      try {
        if (enableProfiling) {
          try {
            return workLoop(initialTime);
          } catch (error) {
            if (currentTask !== null) {
              var currentTime = exports.unstable_now(); // $FlowFixMe[incompatible-call] found when upgrading Flow

              markTaskErrored(currentTask, currentTime); // $FlowFixMe[incompatible-use] found when upgrading Flow

              currentTask.isQueued = false;
            }

            throw error;
          }
        } else {
          // No catch in prod code path.
          return workLoop(initialTime);
        }
      } finally {
        currentTask = null;
        currentPriorityLevel = previousPriorityLevel;
        isPerformingWork = false;

        if (enableProfiling) {
          var _currentTime = exports.unstable_now();

          markSchedulerSuspended(_currentTime);
        }
      }
    }

    function workLoop(initialTime) {
      var currentTime = initialTime;
      advanceTimers(currentTime);
      currentTask = peek(taskQueue);

      while (currentTask !== null && !isSchedulerPaused) {
        if (currentTask.expirationTime > currentTime && shouldYieldToHost()) {
          // This currentTask hasn't expired, and we've reached the deadline.
          break;
        } // $FlowFixMe[incompatible-use] found when upgrading Flow

        var callback = currentTask.callback;

        if (typeof callback === "function") {
          // $FlowFixMe[incompatible-use] found when upgrading Flow
          currentTask.callback = null; // $FlowFixMe[incompatible-use] found when upgrading Flow

          currentPriorityLevel = currentTask.priorityLevel; // $FlowFixMe[incompatible-use] found when upgrading Flow

          var didUserCallbackTimeout =
            currentTask.expirationTime <= currentTime;

          if (enableProfiling) {
            // $FlowFixMe[incompatible-call] found when upgrading Flow
            markTaskRun(currentTask, currentTime);
          }

          var continuationCallback = callback(didUserCallbackTimeout);
          currentTime = exports.unstable_now();

          if (typeof continuationCallback === "function") {
            // If a continuation is returned, immediately yield to the main thread
            // regardless of how much time is left in the current time slice.
            // $FlowFixMe[incompatible-use] found when upgrading Flow
            currentTask.callback = continuationCallback;

            if (enableProfiling) {
              // $FlowFixMe[incompatible-call] found when upgrading Flow
              markTaskYield(currentTask, currentTime);
            }

            advanceTimers(currentTime);
            return true;
          } else {
            if (enableProfiling) {
              // $FlowFixMe[incompatible-call] found when upgrading Flow
              markTaskCompleted(currentTask, currentTime); // $FlowFixMe[incompatible-use] found when upgrading Flow

              currentTask.isQueued = false;
            }

            if (currentTask === peek(taskQueue)) {
              pop(taskQueue);
            }

            advanceTimers(currentTime);
          }
        } else {
          pop(taskQueue);
        }

        currentTask = peek(taskQueue);
      } // Return whether there's additional work

      if (currentTask !== null) {
        return true;
      } else {
        var firstTimer = peek(timerQueue);

        if (firstTimer !== null) {
          requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);
        }

        return false;
      }
    }

    function unstable_runWithPriority(priorityLevel, eventHandler) {
      switch (priorityLevel) {
        case ImmediatePriority:
        case UserBlockingPriority:
        case NormalPriority:
        case LowPriority:
        case IdlePriority:
          break;

        default:
          priorityLevel = NormalPriority;
      }

      var previousPriorityLevel = currentPriorityLevel;
      currentPriorityLevel = priorityLevel;

      try {
        return eventHandler();
      } finally {
        currentPriorityLevel = previousPriorityLevel;
      }
    }

    function unstable_next(eventHandler) {
      var priorityLevel;

      switch (currentPriorityLevel) {
        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;
          break;
      }

      var previousPriorityLevel = currentPriorityLevel;
      currentPriorityLevel = priorityLevel;

      try {
        return eventHandler();
      } finally {
        currentPriorityLevel = previousPriorityLevel;
      }
    }

    function unstable_wrapCallback(callback) {
      var parentPriorityLevel = currentPriorityLevel; // $FlowFixMe[incompatible-return]
      // $FlowFixMe[missing-this-annot]

      return function () {
        // This is a fork of runWithPriority, inlined for performance.
        var previousPriorityLevel = currentPriorityLevel;
        currentPriorityLevel = parentPriorityLevel;

        try {
          return callback.apply(this, arguments);
        } finally {
          currentPriorityLevel = previousPriorityLevel;
        }
      };
    }

    function unstable_scheduleCallback(priorityLevel, callback, options) {
      var currentTime = exports.unstable_now();
      var startTime;

      if (typeof options === "object" && options !== null) {
        var delay = options.delay;

        if (typeof delay === "number" && delay > 0) {
          startTime = currentTime + delay;
        } else {
          startTime = currentTime;
        }
      } else {
        startTime = currentTime;
      }

      var timeout;

      switch (priorityLevel) {
        case ImmediatePriority:
          // Times out immediately
          timeout = -1;
          break;

        case UserBlockingPriority:
          // Eventually times out
          timeout = userBlockingPriorityTimeout;
          break;

        case IdlePriority:
          // Never times out
          timeout = maxSigned31BitInt;
          break;

        case LowPriority:
          // Eventually times out
          timeout = lowPriorityTimeout;
          break;

        case NormalPriority:
        default:
          // Eventually times out
          timeout = normalPriorityTimeout;
          break;
      }

      var expirationTime = startTime + timeout;
      var newTask = {
        id: taskIdCounter++,
        callback: callback,
        priorityLevel: priorityLevel,
        startTime: startTime,
        expirationTime: expirationTime,
        sortIndex: -1
      };

      if (enableProfiling) {
        newTask.isQueued = false;
      }

      if (startTime > currentTime) {
        // This is a delayed task.
        newTask.sortIndex = startTime;
        push(timerQueue, newTask);

        if (peek(taskQueue) === null && newTask === peek(timerQueue)) {
          // All tasks are delayed, and this is the task with the earliest delay.
          if (isHostTimeoutScheduled) {
            // Cancel an existing timeout.
            cancelHostTimeout();
          } else {
            isHostTimeoutScheduled = true;
          } // Schedule a timeout.

          requestHostTimeout(handleTimeout, startTime - currentTime);
        }
      } else {
        newTask.sortIndex = expirationTime;
        push(taskQueue, newTask);

        if (enableProfiling) {
          markTaskStart(newTask, currentTime);
          newTask.isQueued = true;
        } // Schedule a host callback, if needed. If we're already performing work,
        // wait until the next time we yield.

        if (!isHostCallbackScheduled && !isPerformingWork) {
          isHostCallbackScheduled = true;
          requestHostCallback();
        }
      }

      return newTask;
    }

    function unstable_pauseExecution() {
      isSchedulerPaused = true;
    }

    function unstable_continueExecution() {
      isSchedulerPaused = false;

      if (!isHostCallbackScheduled && !isPerformingWork) {
        isHostCallbackScheduled = true;
        requestHostCallback();
      }
    }

    function unstable_getFirstCallbackNode() {
      return peek(taskQueue);
    }

    function unstable_cancelCallback(task) {
      if (enableProfiling) {
        if (task.isQueued) {
          var currentTime = exports.unstable_now();
          markTaskCanceled(task, currentTime);
          task.isQueued = false;
        }
      } // Null out the callback to indicate the task has been canceled. (Can't
      // remove from the queue because you can't remove arbitrary nodes from an
      // array based heap, only the first one.)

      task.callback = null;
    }

    function unstable_getCurrentPriorityLevel() {
      return currentPriorityLevel;
    }

    var isMessageLoopRunning = false;
    var taskTimeoutID = -1; // Scheduler periodically yields in case there is other work on the main
    // thread, like user events. By default, it yields multiple times per frame.
    // It does not attempt to align with frame boundaries, since most tasks don't
    // need to be frame aligned; for those that do, use requestAnimationFrame.

    var frameInterval = frameYieldMs;
    var continuousInputInterval = continuousYieldMs;
    var maxInterval = maxYieldMs;
    var startTime = -1;
    var needsPaint = false;

    function shouldYieldToHost() {
      var timeElapsed = exports.unstable_now() - startTime;

      if (timeElapsed < frameInterval) {
        // The main thread has only been blocked for a really short amount of time;
        // smaller than a single frame. Don't yield yet.
        return false;
      } // The main thread has been blocked for a non-negligible amount of time. We
      // may want to yield control of the main thread, so the browser can perform
      // high priority tasks. The main ones are painting and user input. If there's
      // a pending paint or a pending input, then we should yield. But if there's
      // neither, then we can yield less often while remaining responsive. We'll
      // eventually yield regardless, since there could be a pending paint that
      // wasn't accompanied by a call to `requestPaint`, or other main thread tasks
      // like network events.

      if (enableIsInputPending) {
        if (needsPaint) {
          // There's a pending paint (signaled by `requestPaint`). Yield now.
          return true;
        }

        if (timeElapsed < continuousInputInterval) {
          // We haven't blocked the thread for that long. Only yield if there's a
          // pending discrete input (e.g. click). It's OK if there's pending
          // continuous input (e.g. mouseover).
          if (isInputPending !== null) {
            return isInputPending();
          }
        } else if (timeElapsed < maxInterval) {
          // Yield if there's either a pending discrete or continuous input.
          if (isInputPending !== null) {
            return isInputPending(continuousOptions);
          }
        } else {
          // We've blocked the thread for a long time. Even if there's no pending
          // input, there may be some other scheduled work that we don't know about,
          // like a network event. Yield now.
          return true;
        }
      } // `isInputPending` isn't available. Yield now.

      return true;
    }

    function requestPaint() {
      if (
        enableIsInputPending &&
        navigator !== undefined && // $FlowFixMe[prop-missing]
        navigator.scheduling !== undefined && // $FlowFixMe[incompatible-type]
        navigator.scheduling.isInputPending !== undefined
      ) {
        needsPaint = true;
      } // Since we yield every frame regardless, `requestPaint` has no effect.
    }

    function forceFrameRate(fps) {
      if (fps < 0 || fps > 125) {
        // Using console['error'] to evade Babel and ESLint
        console["error"](
          "forceFrameRate takes a positive int between 0 and 125, " +
            "forcing frame rates higher than 125 fps is not supported"
        );
        return;
      }

      if (fps > 0) {
        frameInterval = Math.floor(1000 / fps);
      } else {
        // reset the framerate
        frameInterval = frameYieldMs;
      }
    }

    var performWorkUntilDeadline = function () {
      if (isMessageLoopRunning) {
        var currentTime = exports.unstable_now(); // Keep track of the start time so we can measure how long the main thread
        // has been blocked.

        startTime = currentTime; // If a scheduler task throws, exit the current browser task so the
        // error can be observed.
        //
        // Intentionally not using a try-catch, since that makes some debugging
        // techniques harder. Instead, if `flushWork` errors, then `hasMoreWork` will
        // remain true, and we'll continue the work loop.

        var hasMoreWork = true;

        try {
          hasMoreWork = flushWork(currentTime);
        } finally {
          if (hasMoreWork) {
            // If there's more work, schedule the next message event at the end
            // of the preceding one.
            schedulePerformWorkUntilDeadline();
          } else {
            isMessageLoopRunning = false;
          }
        }
      } // Yielding to the browser will give it a chance to paint, so we can
      // reset this.

      needsPaint = false;
    };

    var schedulePerformWorkUntilDeadline;

    if (typeof localSetImmediate === "function") {
      // Node.js and old IE.
      // There's a few reasons for why we prefer setImmediate.
      //
      // Unlike MessageChannel, it doesn't prevent a Node.js process from exiting.
      // (Even though this is a DOM fork of the Scheduler, you could get here
      // with a mix of Node.js 15+, which has a MessageChannel, and jsdom.)
      // https://github.com/facebook/react/issues/20756
      //
      // But also, it runs earlier which is the semantic we want.
      // If other browsers ever implement it, it's better to use it.
      // Although both of these would be inferior to native scheduling.
      schedulePerformWorkUntilDeadline = function () {
        localSetImmediate(performWorkUntilDeadline);
      };
    } else if (typeof MessageChannel !== "undefined") {
      // DOM and Worker environments.
      // We prefer MessageChannel because of the 4ms setTimeout clamping.
      var channel = new MessageChannel();
      var port = channel.port2;
      channel.port1.onmessage = performWorkUntilDeadline;

      schedulePerformWorkUntilDeadline = function () {
        port.postMessage(null);
      };
    } else {
      // We should only fallback here in non-browser environments.
      schedulePerformWorkUntilDeadline = function () {
        // $FlowFixMe[not-a-function] nullable value
        localSetTimeout(performWorkUntilDeadline, 0);
      };
    }

    function requestHostCallback() {
      if (!isMessageLoopRunning) {
        isMessageLoopRunning = true;
        schedulePerformWorkUntilDeadline();
      }
    }

    function requestHostTimeout(callback, ms) {
      // $FlowFixMe[not-a-function] nullable value
      taskTimeoutID = localSetTimeout(function () {
        callback(exports.unstable_now());
      }, ms);
    }

    function cancelHostTimeout() {
      // $FlowFixMe[not-a-function] nullable value
      localClearTimeout(taskTimeoutID);
      taskTimeoutID = -1;
    }
    var unstable_Profiling = enableProfiling
      ? {
          startLoggingProfilingEvents: startLoggingProfilingEvents,
          stopLoggingProfilingEvents: stopLoggingProfilingEvents
        }
      : null;

    exports.unstable_IdlePriority = IdlePriority;
    exports.unstable_ImmediatePriority = ImmediatePriority;
    exports.unstable_LowPriority = LowPriority;
    exports.unstable_NormalPriority = NormalPriority;
    exports.unstable_Profiling = unstable_Profiling;
    exports.unstable_UserBlockingPriority = UserBlockingPriority;
    exports.unstable_cancelCallback = unstable_cancelCallback;
    exports.unstable_continueExecution = unstable_continueExecution;
    exports.unstable_forceFrameRate = forceFrameRate;
    exports.unstable_getCurrentPriorityLevel = unstable_getCurrentPriorityLevel;
    exports.unstable_getFirstCallbackNode = unstable_getFirstCallbackNode;
    exports.unstable_next = unstable_next;
    exports.unstable_pauseExecution = unstable_pauseExecution;
    exports.unstable_requestPaint = requestPaint;
    exports.unstable_runWithPriority = unstable_runWithPriority;
    exports.unstable_scheduleCallback = unstable_scheduleCallback;
    exports.unstable_shouldYield = shouldYieldToHost;
    exports.unstable_wrapCallback = unstable_wrapCallback;
    /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
    if (
      typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== "undefined" &&
      typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop ===
        "function"
    ) {
      __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop(new Error());
    }
  })();
}