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node_modules/scheduler/cjs/scheduler.development.js

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+/**
+ * @license React
+ * scheduler.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';
+
+/* 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());
+}
+          var enableSchedulerDebugging = false;
+var enableProfiling = false;
+var frameYieldMs = 5;
+
+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 */
+
+var hasPerformanceNow = 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; // 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; // 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' && navigator.scheduling !== undefined && navigator.scheduling.isInputPending !== undefined ? navigator.scheduling.isInputPending.bind(navigator.scheduling) : null;
+
+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 = exports.unstable_now();
+          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 = exports.unstable_now();
+
+      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 = 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:
+      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;
+}
+
+var isMessageLoopRunning = false;
+var scheduledHostCallback = null;
+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 startTime = -1;
+
+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
+
+
+  return true;
+}
+
+function requestPaint() {
+
+}
+
+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 (scheduledHostCallback !== null) {
+    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;
+    var hasTimeRemaining = true; // 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 `scheduledHostCallback` errors, then
+    // `hasMoreWork` will remain true, and we'll continue the work loop.
+
+    var hasMoreWork = true;
+
+    try {
+      hasMoreWork = scheduledHostCallback(hasTimeRemaining, 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;
+        scheduledHostCallback = null;
+      }
+    }
+  } else {
+    isMessageLoopRunning = false;
+  } // Yielding to the browser will give it a chance to paint, so we can
+};
+
+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 () {
+    localSetTimeout(performWorkUntilDeadline, 0);
+  };
+}
+
+function requestHostCallback(callback) {
+  scheduledHostCallback = callback;
+
+  if (!isMessageLoopRunning) {
+    isMessageLoopRunning = true;
+    schedulePerformWorkUntilDeadline();
+  }
+}
+
+function requestHostTimeout(callback, ms) {
+  taskTimeoutID = localSetTimeout(function () {
+    callback(exports.unstable_now());
+  }, ms);
+}
+
+function cancelHostTimeout() {
+  localClearTimeout(taskTimeoutID);
+  taskTimeoutID = -1;
+}
+
+var unstable_requestPaint = requestPaint;
+var unstable_Profiling =  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 = unstable_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());
+}
+        
+  })();
+}