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node_modules/scheduler/cjs/scheduler-unstable_mock.development.js

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+/**
+ * @license React
+ * scheduler-unstable_mock.development.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+'use strict';
+
+if (process.env.NODE_ENV !== "production") {
+  (function() {
+'use strict';
+
+var enableSchedulerDebugging = false;
+var enableProfiling = false;
+
+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;
+
+function markTaskErrored(task, ms) {
+}
+
+/* eslint-disable no-var */
+// Math.pow(2, 30) - 1
+// 0b111111111111111111111111111111
+
+var maxSigned31BitInt = 1073741823; // Times out immediately
+
+var IMMEDIATE_PRIORITY_TIMEOUT = -1; // Eventually times out
+
+var USER_BLOCKING_PRIORITY_TIMEOUT = 250;
+var NORMAL_PRIORITY_TIMEOUT = 5000;
+var LOW_PRIORITY_TIMEOUT = 10000; // Never times out
+
+var IDLE_PRIORITY_TIMEOUT = maxSigned31BitInt; // 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 currentTask = null;
+var currentPriorityLevel = NormalPriority; // This is set while performing work, to prevent re-entrance.
+
+var isPerformingWork = false;
+var isHostCallbackScheduled = false;
+var isHostTimeoutScheduled = false;
+var currentMockTime = 0;
+var scheduledCallback = null;
+var scheduledTimeout = null;
+var timeoutTime = -1;
+var yieldedValues = null;
+var expectedNumberOfYields = -1;
+var didStop = false;
+var isFlushing = false;
+var needsPaint = false;
+var shouldYieldForPaint = false;
+var disableYieldValue = false;
+
+function setDisableYieldValue(newValue) {
+  disableYieldValue = newValue;
+}
+
+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);
+    } 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(flushWork);
+    } else {
+      var firstTimer = peek(timerQueue);
+
+      if (firstTimer !== null) {
+        requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);
+      }
+    }
+  }
+}
+
+function flushWork(hasTimeRemaining, initialTime) {
+
+
+  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(hasTimeRemaining, initialTime);
+      } catch (error) {
+        if (currentTask !== null) {
+          var currentTime = getCurrentTime();
+          markTaskErrored(currentTask, currentTime);
+          currentTask.isQueued = false;
+        }
+
+        throw error;
+      }
+    } else {
+      // No catch in prod code path.
+      return workLoop(hasTimeRemaining, initialTime);
+    }
+  } finally {
+    currentTask = null;
+    currentPriorityLevel = previousPriorityLevel;
+    isPerformingWork = false;
+  }
+}
+
+function workLoop(hasTimeRemaining, initialTime) {
+  var currentTime = initialTime;
+  advanceTimers(currentTime);
+  currentTask = peek(taskQueue);
+
+  while (currentTask !== null && !(enableSchedulerDebugging )) {
+    if (currentTask.expirationTime > currentTime && (!hasTimeRemaining || shouldYieldToHost())) {
+      // This currentTask hasn't expired, and we've reached the deadline.
+      break;
+    }
+
+    var callback = currentTask.callback;
+
+    if (typeof callback === 'function') {
+      currentTask.callback = null;
+      currentPriorityLevel = currentTask.priorityLevel;
+      var didUserCallbackTimeout = currentTask.expirationTime <= currentTime;
+
+      var continuationCallback = callback(didUserCallbackTimeout);
+      currentTime = getCurrentTime();
+
+      if (typeof continuationCallback === 'function') {
+        currentTask.callback = continuationCallback;
+      } else {
+
+        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;
+  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 = getCurrentTime();
+  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:
+      timeout = IMMEDIATE_PRIORITY_TIMEOUT;
+      break;
+
+    case UserBlockingPriority:
+      timeout = USER_BLOCKING_PRIORITY_TIMEOUT;
+      break;
+
+    case IdlePriority:
+      timeout = IDLE_PRIORITY_TIMEOUT;
+      break;
+
+    case LowPriority:
+      timeout = LOW_PRIORITY_TIMEOUT;
+      break;
+
+    case NormalPriority:
+    default:
+      timeout = NORMAL_PRIORITY_TIMEOUT;
+      break;
+  }
+
+  var expirationTime = startTime + timeout;
+  var newTask = {
+    id: taskIdCounter++,
+    callback: callback,
+    priorityLevel: priorityLevel,
+    startTime: startTime,
+    expirationTime: expirationTime,
+    sortIndex: -1
+  };
+
+  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);
+    // wait until the next time we yield.
+
+
+    if (!isHostCallbackScheduled && !isPerformingWork) {
+      isHostCallbackScheduled = true;
+      requestHostCallback(flushWork);
+    }
+  }
+
+  return newTask;
+}
+
+function unstable_pauseExecution() {
+}
+
+function unstable_continueExecution() {
+
+  if (!isHostCallbackScheduled && !isPerformingWork) {
+    isHostCallbackScheduled = true;
+    requestHostCallback(flushWork);
+  }
+}
+
+function unstable_getFirstCallbackNode() {
+  return peek(taskQueue);
+}
+
+function unstable_cancelCallback(task) {
+  // 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;
+}
+
+function requestHostCallback(callback) {
+  scheduledCallback = callback;
+}
+
+function requestHostTimeout(callback, ms) {
+  scheduledTimeout = callback;
+  timeoutTime = currentMockTime + ms;
+}
+
+function cancelHostTimeout() {
+  scheduledTimeout = null;
+  timeoutTime = -1;
+}
+
+function shouldYieldToHost() {
+  if (expectedNumberOfYields === 0 && yieldedValues === null || expectedNumberOfYields !== -1 && yieldedValues !== null && yieldedValues.length >= expectedNumberOfYields || shouldYieldForPaint && needsPaint) {
+    // We yielded at least as many values as expected. Stop flushing.
+    didStop = true;
+    return true;
+  }
+
+  return false;
+}
+
+function getCurrentTime() {
+  return currentMockTime;
+}
+
+function forceFrameRate() {// No-op
+}
+
+function reset() {
+  if (isFlushing) {
+    throw new Error('Cannot reset while already flushing work.');
+  }
+
+  currentMockTime = 0;
+  scheduledCallback = null;
+  scheduledTimeout = null;
+  timeoutTime = -1;
+  yieldedValues = null;
+  expectedNumberOfYields = -1;
+  didStop = false;
+  isFlushing = false;
+  needsPaint = false;
+} // Should only be used via an assertion helper that inspects the yielded values.
+
+
+function unstable_flushNumberOfYields(count) {
+  if (isFlushing) {
+    throw new Error('Already flushing work.');
+  }
+
+  if (scheduledCallback !== null) {
+    var cb = scheduledCallback;
+    expectedNumberOfYields = count;
+    isFlushing = true;
+
+    try {
+      var hasMoreWork = true;
+
+      do {
+        hasMoreWork = cb(true, currentMockTime);
+      } while (hasMoreWork && !didStop);
+
+      if (!hasMoreWork) {
+        scheduledCallback = null;
+      }
+    } finally {
+      expectedNumberOfYields = -1;
+      didStop = false;
+      isFlushing = false;
+    }
+  }
+}
+
+function unstable_flushUntilNextPaint() {
+  if (isFlushing) {
+    throw new Error('Already flushing work.');
+  }
+
+  if (scheduledCallback !== null) {
+    var cb = scheduledCallback;
+    shouldYieldForPaint = true;
+    needsPaint = false;
+    isFlushing = true;
+
+    try {
+      var hasMoreWork = true;
+
+      do {
+        hasMoreWork = cb(true, currentMockTime);
+      } while (hasMoreWork && !didStop);
+
+      if (!hasMoreWork) {
+        scheduledCallback = null;
+      }
+    } finally {
+      shouldYieldForPaint = false;
+      didStop = false;
+      isFlushing = false;
+    }
+  }
+}
+
+function unstable_flushExpired() {
+  if (isFlushing) {
+    throw new Error('Already flushing work.');
+  }
+
+  if (scheduledCallback !== null) {
+    isFlushing = true;
+
+    try {
+      var hasMoreWork = scheduledCallback(false, currentMockTime);
+
+      if (!hasMoreWork) {
+        scheduledCallback = null;
+      }
+    } finally {
+      isFlushing = false;
+    }
+  }
+}
+
+function unstable_flushAllWithoutAsserting() {
+  // Returns false if no work was flushed.
+  if (isFlushing) {
+    throw new Error('Already flushing work.');
+  }
+
+  if (scheduledCallback !== null) {
+    var cb = scheduledCallback;
+    isFlushing = true;
+
+    try {
+      var hasMoreWork = true;
+
+      do {
+        hasMoreWork = cb(true, currentMockTime);
+      } while (hasMoreWork);
+
+      if (!hasMoreWork) {
+        scheduledCallback = null;
+      }
+
+      return true;
+    } finally {
+      isFlushing = false;
+    }
+  } else {
+    return false;
+  }
+}
+
+function unstable_clearYields() {
+  if (yieldedValues === null) {
+    return [];
+  }
+
+  var values = yieldedValues;
+  yieldedValues = null;
+  return values;
+}
+
+function unstable_flushAll() {
+  if (yieldedValues !== null) {
+    throw new Error('Log is not empty. Assert on the log of yielded values before ' + 'flushing additional work.');
+  }
+
+  unstable_flushAllWithoutAsserting();
+
+  if (yieldedValues !== null) {
+    throw new Error('While flushing work, something yielded a value. Use an ' + 'assertion helper to assert on the log of yielded values, e.g. ' + 'expect(Scheduler).toFlushAndYield([...])');
+  }
+}
+
+function unstable_yieldValue(value) {
+  // eslint-disable-next-line react-internal/no-production-logging
+  if (console.log.name === 'disabledLog' || disableYieldValue) {
+    // If console.log has been patched, we assume we're in render
+    // replaying and we ignore any values yielding in the second pass.
+    return;
+  }
+
+  if (yieldedValues === null) {
+    yieldedValues = [value];
+  } else {
+    yieldedValues.push(value);
+  }
+}
+
+function unstable_advanceTime(ms) {
+  // eslint-disable-next-line react-internal/no-production-logging
+  if (console.log.name === 'disabledLog' || disableYieldValue) {
+    // If console.log has been patched, we assume we're in render
+    // replaying and we ignore any time advancing in the second pass.
+    return;
+  }
+
+  currentMockTime += ms;
+
+  if (scheduledTimeout !== null && timeoutTime <= currentMockTime) {
+    scheduledTimeout(currentMockTime);
+    timeoutTime = -1;
+    scheduledTimeout = null;
+  }
+}
+
+function requestPaint() {
+  needsPaint = true;
+}
+var unstable_Profiling =  null;
+
+exports.reset = reset;
+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_advanceTime = unstable_advanceTime;
+exports.unstable_cancelCallback = unstable_cancelCallback;
+exports.unstable_clearYields = unstable_clearYields;
+exports.unstable_continueExecution = unstable_continueExecution;
+exports.unstable_flushAll = unstable_flushAll;
+exports.unstable_flushAllWithoutAsserting = unstable_flushAllWithoutAsserting;
+exports.unstable_flushExpired = unstable_flushExpired;
+exports.unstable_flushNumberOfYields = unstable_flushNumberOfYields;
+exports.unstable_flushUntilNextPaint = unstable_flushUntilNextPaint;
+exports.unstable_forceFrameRate = forceFrameRate;
+exports.unstable_getCurrentPriorityLevel = unstable_getCurrentPriorityLevel;
+exports.unstable_getFirstCallbackNode = unstable_getFirstCallbackNode;
+exports.unstable_next = unstable_next;
+exports.unstable_now = getCurrentTime;
+exports.unstable_pauseExecution = unstable_pauseExecution;
+exports.unstable_requestPaint = requestPaint;
+exports.unstable_runWithPriority = unstable_runWithPriority;
+exports.unstable_scheduleCallback = unstable_scheduleCallback;
+exports.unstable_setDisableYieldValue = setDisableYieldValue;
+exports.unstable_shouldYield = shouldYieldToHost;
+exports.unstable_wrapCallback = unstable_wrapCallback;
+exports.unstable_yieldValue = unstable_yieldValue;
+  })();
+}