{"ast":null,"code":"/**\n * @license React\n * scheduler.development.js\n *\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\n'use strict';\n\nif (process.env.NODE_ENV !== \"production\") {\n  (function () {\n    'use strict';\n\n    /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */\n    if (typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined' && typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart === 'function') {\n      __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());\n    }\n    var enableSchedulerDebugging = false;\n    var enableProfiling = false;\n    var frameYieldMs = 5;\n    function push(heap, node) {\n      var index = heap.length;\n      heap.push(node);\n      siftUp(heap, node, index);\n    }\n    function peek(heap) {\n      return heap.length === 0 ? null : heap[0];\n    }\n    function pop(heap) {\n      if (heap.length === 0) {\n        return null;\n      }\n      var first = heap[0];\n      var last = heap.pop();\n      if (last !== first) {\n        heap[0] = last;\n        siftDown(heap, last, 0);\n      }\n      return first;\n    }\n    function siftUp(heap, node, i) {\n      var index = i;\n      while (index > 0) {\n        var parentIndex = index - 1 >>> 1;\n        var parent = heap[parentIndex];\n        if (compare(parent, node) > 0) {\n          // The parent is larger. Swap positions.\n          heap[parentIndex] = node;\n          heap[index] = parent;\n          index = parentIndex;\n        } else {\n          // The parent is smaller. Exit.\n          return;\n        }\n      }\n    }\n    function siftDown(heap, node, i) {\n      var index = i;\n      var length = heap.length;\n      var halfLength = length >>> 1;\n      while (index < halfLength) {\n        var leftIndex = (index + 1) * 2 - 1;\n        var left = heap[leftIndex];\n        var rightIndex = leftIndex + 1;\n        var right = heap[rightIndex]; // If the left or right node is smaller, swap with the smaller of those.\n\n        if (compare(left, node) < 0) {\n          if (rightIndex < length && compare(right, left) < 0) {\n            heap[index] = right;\n            heap[rightIndex] = node;\n            index = rightIndex;\n          } else {\n            heap[index] = left;\n            heap[leftIndex] = node;\n            index = leftIndex;\n          }\n        } else if (rightIndex < length && compare(right, node) < 0) {\n          heap[index] = right;\n          heap[rightIndex] = node;\n          index = rightIndex;\n        } else {\n          // Neither child is smaller. Exit.\n          return;\n        }\n      }\n    }\n    function compare(a, b) {\n      // Compare sort index first, then task id.\n      var diff = a.sortIndex - b.sortIndex;\n      return diff !== 0 ? diff : a.id - b.id;\n    }\n\n    // TODO: Use symbols?\n    var ImmediatePriority = 1;\n    var UserBlockingPriority = 2;\n    var NormalPriority = 3;\n    var LowPriority = 4;\n    var IdlePriority = 5;\n    function markTaskErrored(task, ms) {}\n\n    /* eslint-disable no-var */\n\n    var hasPerformanceNow = typeof performance === 'object' && typeof performance.now === 'function';\n    if (hasPerformanceNow) {\n      var localPerformance = performance;\n      exports.unstable_now = function () {\n        return localPerformance.now();\n      };\n    } else {\n      var localDate = Date;\n      var initialTime = localDate.now();\n      exports.unstable_now = function () {\n        return localDate.now() - initialTime;\n      };\n    } // Max 31 bit integer. The max integer size in V8 for 32-bit systems.\n    // Math.pow(2, 30) - 1\n    // 0b111111111111111111111111111111\n\n    var maxSigned31BitInt = 1073741823; // Times out immediately\n\n    var IMMEDIATE_PRIORITY_TIMEOUT = -1; // Eventually times out\n\n    var USER_BLOCKING_PRIORITY_TIMEOUT = 250;\n    var NORMAL_PRIORITY_TIMEOUT = 5000;\n    var LOW_PRIORITY_TIMEOUT = 10000; // Never times out\n\n    var IDLE_PRIORITY_TIMEOUT = maxSigned31BitInt; // Tasks are stored on a min heap\n\n    var taskQueue = [];\n    var timerQueue = []; // Incrementing id counter. Used to maintain insertion order.\n\n    var taskIdCounter = 1; // Pausing the scheduler is useful for debugging.\n    var currentTask = null;\n    var currentPriorityLevel = NormalPriority; // This is set while performing work, to prevent re-entrance.\n\n    var isPerformingWork = false;\n    var isHostCallbackScheduled = false;\n    var isHostTimeoutScheduled = false; // Capture local references to native APIs, in case a polyfill overrides them.\n\n    var localSetTimeout = typeof setTimeout === 'function' ? setTimeout : null;\n    var localClearTimeout = typeof clearTimeout === 'function' ? clearTimeout : null;\n    var localSetImmediate = typeof setImmediate !== 'undefined' ? setImmediate : null; // IE and Node.js + jsdom\n\n    var isInputPending = typeof navigator !== 'undefined' && navigator.scheduling !== undefined && navigator.scheduling.isInputPending !== undefined ? navigator.scheduling.isInputPending.bind(navigator.scheduling) : null;\n    function advanceTimers(currentTime) {\n      // Check for tasks that are no longer delayed and add them to the queue.\n      var timer = peek(timerQueue);\n      while (timer !== null) {\n        if (timer.callback === null) {\n          // Timer was cancelled.\n          pop(timerQueue);\n        } else if (timer.startTime <= currentTime) {\n          // Timer fired. Transfer to the task queue.\n          pop(timerQueue);\n          timer.sortIndex = timer.expirationTime;\n          push(taskQueue, timer);\n        } else {\n          // Remaining timers are pending.\n          return;\n        }\n        timer = peek(timerQueue);\n      }\n    }\n    function handleTimeout(currentTime) {\n      isHostTimeoutScheduled = false;\n      advanceTimers(currentTime);\n      if (!isHostCallbackScheduled) {\n        if (peek(taskQueue) !== null) {\n          isHostCallbackScheduled = true;\n          requestHostCallback(flushWork);\n        } else {\n          var firstTimer = peek(timerQueue);\n          if (firstTimer !== null) {\n            requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);\n          }\n        }\n      }\n    }\n    function flushWork(hasTimeRemaining, initialTime) {\n      isHostCallbackScheduled = false;\n      if (isHostTimeoutScheduled) {\n        // We scheduled a timeout but it's no longer needed. Cancel it.\n        isHostTimeoutScheduled = false;\n        cancelHostTimeout();\n      }\n      isPerformingWork = true;\n      var previousPriorityLevel = currentPriorityLevel;\n      try {\n        if (enableProfiling) {\n          try {\n            return workLoop(hasTimeRemaining, initialTime);\n          } catch (error) {\n            if (currentTask !== null) {\n              var currentTime = exports.unstable_now();\n              markTaskErrored(currentTask, currentTime);\n              currentTask.isQueued = false;\n            }\n            throw error;\n          }\n        } else {\n          // No catch in prod code path.\n          return workLoop(hasTimeRemaining, initialTime);\n        }\n      } finally {\n        currentTask = null;\n        currentPriorityLevel = previousPriorityLevel;\n        isPerformingWork = false;\n      }\n    }\n    function workLoop(hasTimeRemaining, initialTime) {\n      var currentTime = initialTime;\n      advanceTimers(currentTime);\n      currentTask = peek(taskQueue);\n      while (currentTask !== null && !enableSchedulerDebugging) {\n        if (currentTask.expirationTime > currentTime && (!hasTimeRemaining || shouldYieldToHost())) {\n          // This currentTask hasn't expired, and we've reached the deadline.\n          break;\n        }\n        var callback = currentTask.callback;\n        if (typeof callback === 'function') {\n          currentTask.callback = null;\n          currentPriorityLevel = currentTask.priorityLevel;\n          var didUserCallbackTimeout = currentTask.expirationTime <= currentTime;\n          var continuationCallback = callback(didUserCallbackTimeout);\n          currentTime = exports.unstable_now();\n          if (typeof continuationCallback === 'function') {\n            currentTask.callback = continuationCallback;\n          } else {\n            if (currentTask === peek(taskQueue)) {\n              pop(taskQueue);\n            }\n          }\n          advanceTimers(currentTime);\n        } else {\n          pop(taskQueue);\n        }\n        currentTask = peek(taskQueue);\n      } // Return whether there's additional work\n\n      if (currentTask !== null) {\n        return true;\n      } else {\n        var firstTimer = peek(timerQueue);\n        if (firstTimer !== null) {\n          requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);\n        }\n        return false;\n      }\n    }\n    function unstable_runWithPriority(priorityLevel, eventHandler) {\n      switch (priorityLevel) {\n        case ImmediatePriority:\n        case UserBlockingPriority:\n        case NormalPriority:\n        case LowPriority:\n        case IdlePriority:\n          break;\n        default:\n          priorityLevel = NormalPriority;\n      }\n      var previousPriorityLevel = currentPriorityLevel;\n      currentPriorityLevel = priorityLevel;\n      try {\n        return eventHandler();\n      } finally {\n        currentPriorityLevel = previousPriorityLevel;\n      }\n    }\n    function unstable_next(eventHandler) {\n      var priorityLevel;\n      switch (currentPriorityLevel) {\n        case ImmediatePriority:\n        case UserBlockingPriority:\n        case NormalPriority:\n          // Shift down to normal priority\n          priorityLevel = NormalPriority;\n          break;\n        default:\n          // Anything lower than normal priority should remain at the current level.\n          priorityLevel = currentPriorityLevel;\n          break;\n      }\n      var previousPriorityLevel = currentPriorityLevel;\n      currentPriorityLevel = priorityLevel;\n      try {\n        return eventHandler();\n      } finally {\n        currentPriorityLevel = previousPriorityLevel;\n      }\n    }\n    function unstable_wrapCallback(callback) {\n      var parentPriorityLevel = currentPriorityLevel;\n      return function () {\n        // This is a fork of runWithPriority, inlined for performance.\n        var previousPriorityLevel = currentPriorityLevel;\n        currentPriorityLevel = parentPriorityLevel;\n        try {\n          return callback.apply(this, arguments);\n        } finally {\n          currentPriorityLevel = previousPriorityLevel;\n        }\n      };\n    }\n    function unstable_scheduleCallback(priorityLevel, callback, options) {\n      var currentTime = exports.unstable_now();\n      var startTime;\n      if (typeof options === 'object' && options !== null) {\n        var delay = options.delay;\n        if (typeof delay === 'number' && delay > 0) {\n          startTime = currentTime + delay;\n        } else {\n          startTime = currentTime;\n        }\n      } else {\n        startTime = currentTime;\n      }\n      var timeout;\n      switch (priorityLevel) {\n        case ImmediatePriority:\n          timeout = IMMEDIATE_PRIORITY_TIMEOUT;\n          break;\n        case UserBlockingPriority:\n          timeout = USER_BLOCKING_PRIORITY_TIMEOUT;\n          break;\n        case IdlePriority:\n          timeout = IDLE_PRIORITY_TIMEOUT;\n          break;\n        case LowPriority:\n          timeout = LOW_PRIORITY_TIMEOUT;\n          break;\n        case NormalPriority:\n        default:\n          timeout = NORMAL_PRIORITY_TIMEOUT;\n          break;\n      }\n      var expirationTime = startTime + timeout;\n      var newTask = {\n        id: taskIdCounter++,\n        callback: callback,\n        priorityLevel: priorityLevel,\n        startTime: startTime,\n        expirationTime: expirationTime,\n        sortIndex: -1\n      };\n      if (startTime > currentTime) {\n        // This is a delayed task.\n        newTask.sortIndex = startTime;\n        push(timerQueue, newTask);\n        if (peek(taskQueue) === null && newTask === peek(timerQueue)) {\n          // All tasks are delayed, and this is the task with the earliest delay.\n          if (isHostTimeoutScheduled) {\n            // Cancel an existing timeout.\n            cancelHostTimeout();\n          } else {\n            isHostTimeoutScheduled = true;\n          } // Schedule a timeout.\n\n          requestHostTimeout(handleTimeout, startTime - currentTime);\n        }\n      } else {\n        newTask.sortIndex = expirationTime;\n        push(taskQueue, newTask);\n        // wait until the next time we yield.\n\n        if (!isHostCallbackScheduled && !isPerformingWork) {\n          isHostCallbackScheduled = true;\n          requestHostCallback(flushWork);\n        }\n      }\n      return newTask;\n    }\n    function unstable_pauseExecution() {}\n    function unstable_continueExecution() {\n      if (!isHostCallbackScheduled && !isPerformingWork) {\n        isHostCallbackScheduled = true;\n        requestHostCallback(flushWork);\n      }\n    }\n    function unstable_getFirstCallbackNode() {\n      return peek(taskQueue);\n    }\n    function unstable_cancelCallback(task) {\n      // remove from the queue because you can't remove arbitrary nodes from an\n      // array based heap, only the first one.)\n\n      task.callback = null;\n    }\n    function unstable_getCurrentPriorityLevel() {\n      return currentPriorityLevel;\n    }\n    var isMessageLoopRunning = false;\n    var scheduledHostCallback = null;\n    var taskTimeoutID = -1; // Scheduler periodically yields in case there is other work on the main\n    // thread, like user events. By default, it yields multiple times per frame.\n    // It does not attempt to align with frame boundaries, since most tasks don't\n    // need to be frame aligned; for those that do, use requestAnimationFrame.\n\n    var frameInterval = frameYieldMs;\n    var startTime = -1;\n    function shouldYieldToHost() {\n      var timeElapsed = exports.unstable_now() - startTime;\n      if (timeElapsed < frameInterval) {\n        // The main thread has only been blocked for a really short amount of time;\n        // smaller than a single frame. Don't yield yet.\n        return false;\n      } // The main thread has been blocked for a non-negligible amount of time. We\n\n      return true;\n    }\n    function requestPaint() {}\n    function forceFrameRate(fps) {\n      if (fps < 0 || fps > 125) {\n        // Using console['error'] to evade Babel and ESLint\n        console['error']('forceFrameRate takes a positive int between 0 and 125, ' + 'forcing frame rates higher than 125 fps is not supported');\n        return;\n      }\n      if (fps > 0) {\n        frameInterval = Math.floor(1000 / fps);\n      } else {\n        // reset the framerate\n        frameInterval = frameYieldMs;\n      }\n    }\n    var performWorkUntilDeadline = function () {\n      if (scheduledHostCallback !== null) {\n        var currentTime = exports.unstable_now(); // Keep track of the start time so we can measure how long the main thread\n        // has been blocked.\n\n        startTime = currentTime;\n        var hasTimeRemaining = true; // If a scheduler task throws, exit the current browser task so the\n        // error can be observed.\n        //\n        // Intentionally not using a try-catch, since that makes some debugging\n        // techniques harder. Instead, if `scheduledHostCallback` errors, then\n        // `hasMoreWork` will remain true, and we'll continue the work loop.\n\n        var hasMoreWork = true;\n        try {\n          hasMoreWork = scheduledHostCallback(hasTimeRemaining, currentTime);\n        } finally {\n          if (hasMoreWork) {\n            // If there's more work, schedule the next message event at the end\n            // of the preceding one.\n            schedulePerformWorkUntilDeadline();\n          } else {\n            isMessageLoopRunning = false;\n            scheduledHostCallback = null;\n          }\n        }\n      } else {\n        isMessageLoopRunning = false;\n      } // Yielding to the browser will give it a chance to paint, so we can\n    };\n    var schedulePerformWorkUntilDeadline;\n    if (typeof localSetImmediate === 'function') {\n      // Node.js and old IE.\n      // There's a few reasons for why we prefer setImmediate.\n      //\n      // Unlike MessageChannel, it doesn't prevent a Node.js process from exiting.\n      // (Even though this is a DOM fork of the Scheduler, you could get here\n      // with a mix of Node.js 15+, which has a MessageChannel, and jsdom.)\n      // https://github.com/facebook/react/issues/20756\n      //\n      // But also, it runs earlier which is the semantic we want.\n      // If other browsers ever implement it, it's better to use it.\n      // Although both of these would be inferior to native scheduling.\n      schedulePerformWorkUntilDeadline = function () {\n        localSetImmediate(performWorkUntilDeadline);\n      };\n    } else if (typeof MessageChannel !== 'undefined') {\n      // DOM and Worker environments.\n      // We prefer MessageChannel because of the 4ms setTimeout clamping.\n      var channel = new MessageChannel();\n      var port = channel.port2;\n      channel.port1.onmessage = performWorkUntilDeadline;\n      schedulePerformWorkUntilDeadline = function () {\n        port.postMessage(null);\n      };\n    } else {\n      // We should only fallback here in non-browser environments.\n      schedulePerformWorkUntilDeadline = function () {\n        localSetTimeout(performWorkUntilDeadline, 0);\n      };\n    }\n    function requestHostCallback(callback) {\n      scheduledHostCallback = callback;\n      if (!isMessageLoopRunning) {\n        isMessageLoopRunning = true;\n        schedulePerformWorkUntilDeadline();\n      }\n    }\n    function requestHostTimeout(callback, ms) {\n      taskTimeoutID = localSetTimeout(function () {\n        callback(exports.unstable_now());\n      }, ms);\n    }\n    function cancelHostTimeout() {\n      localClearTimeout(taskTimeoutID);\n      taskTimeoutID = -1;\n    }\n    var unstable_requestPaint = requestPaint;\n    var unstable_Profiling = null;\n    exports.unstable_IdlePriority = IdlePriority;\n    exports.unstable_ImmediatePriority = ImmediatePriority;\n    exports.unstable_LowPriority = LowPriority;\n    exports.unstable_NormalPriority = NormalPriority;\n    exports.unstable_Profiling = unstable_Profiling;\n    exports.unstable_UserBlockingPriority = UserBlockingPriority;\n    exports.unstable_cancelCallback = unstable_cancelCallback;\n    exports.unstable_continueExecution = unstable_continueExecution;\n    exports.unstable_forceFrameRate = forceFrameRate;\n    exports.unstable_getCurrentPriorityLevel = unstable_getCurrentPriorityLevel;\n    exports.unstable_getFirstCallbackNode = unstable_getFirstCallbackNode;\n    exports.unstable_next = unstable_next;\n    exports.unstable_pauseExecution = unstable_pauseExecution;\n    exports.unstable_requestPaint = unstable_requestPaint;\n    exports.unstable_runWithPriority = unstable_runWithPriority;\n    exports.unstable_scheduleCallback = unstable_scheduleCallback;\n    exports.unstable_shouldYield = shouldYieldToHost;\n    exports.unstable_wrapCallback = unstable_wrapCallback;\n    /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */\n    if (typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined' && typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop === 'function') {\n      __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop(new Error());\n    }\n  })();\n}","map":{"version":3,"names":["process","env","NODE_ENV","__REACT_DEVTOOLS_GLOBAL_HOOK__","registerInternalModuleStart","Error","enableSchedulerDebugging","enableProfiling","frameYieldMs","push","heap","node","index","length","siftUp","peek","pop","first","last","siftDown","i","parentIndex","parent","compare","halfLength","leftIndex","left","rightIndex","right","a","b","diff","sortIndex","id","ImmediatePriority","UserBlockingPriority","NormalPriority","LowPriority","IdlePriority","markTaskErrored","task","ms","hasPerformanceNow","performance","now","localPerformance","exports","unstable_now","localDate","Date","initialTime","maxSigned31BitInt","IMMEDIATE_PRIORITY_TIMEOUT","USER_BLOCKING_PRIORITY_TIMEOUT","NORMAL_PRIORITY_TIMEOUT","LOW_PRIORITY_TIMEOUT","IDLE_PRIORITY_TIMEOUT","taskQueue","timerQueue","taskIdCounter","currentTask","currentPriorityLevel","isPerformingWork","isHostCallbackScheduled","isHostTimeoutScheduled","localSetTimeout","setTimeout","localClearTimeout","clearTimeout","localSetImmediate","setImmediate","isInputPending","navigator","scheduling","undefined","bind","advanceTimers","currentTime","timer","callback","startTime","expirationTime","handleTimeout","requestHostCallback","flushWork","firstTimer","requestHostTimeout","hasTimeRemaining","cancelHostTimeout","previousPriorityLevel","workLoop","error","isQueued","shouldYieldToHost","priorityLevel","didUserCallbackTimeout","continuationCallback","unstable_runWithPriority","eventHandler","unstable_next","unstable_wrapCallback","parentPriorityLevel","apply","arguments","unstable_scheduleCallback","options","delay","timeout","newTask","unstable_pauseExecution","unstable_continueExecution","unstable_getFirstCallbackNode","unstable_cancelCallback","unstable_getCurrentPriorityLevel","isMessageLoopRunning","scheduledHostCallback","taskTimeoutID","frameInterval","timeElapsed","requestPaint","forceFrameRate","fps","console","Math","floor","performWorkUntilDeadline","hasMoreWork","schedulePerformWorkUntilDeadline","MessageChannel","channel","port","port2","port1","onmessage","postMessage","unstable_requestPaint","unstable_Profiling","unstable_IdlePriority","unstable_ImmediatePriority","unstable_LowPriority","unstable_NormalPriority","unstable_UserBlockingPriority","unstable_forceFrameRate","unstable_shouldYield","registerInternalModuleStop"],"sources":["/var/www/gavt/react-demo/node_modules/scheduler/cjs/scheduler.development.js"],"sourcesContent":["/**\n * @license React\n * scheduler.development.js\n *\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\n'use strict';\n\nif (process.env.NODE_ENV !== \"production\") {\n  (function() {\n\n          'use strict';\n\n/* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */\nif (\n  typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined' &&\n  typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart ===\n    'function'\n) {\n  __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());\n}\n          var enableSchedulerDebugging = false;\nvar enableProfiling = false;\nvar frameYieldMs = 5;\n\nfunction push(heap, node) {\n  var index = heap.length;\n  heap.push(node);\n  siftUp(heap, node, index);\n}\nfunction peek(heap) {\n  return heap.length === 0 ? null : heap[0];\n}\nfunction pop(heap) {\n  if (heap.length === 0) {\n    return null;\n  }\n\n  var first = heap[0];\n  var last = heap.pop();\n\n  if (last !== first) {\n    heap[0] = last;\n    siftDown(heap, last, 0);\n  }\n\n  return first;\n}\n\nfunction siftUp(heap, node, i) {\n  var index = i;\n\n  while (index > 0) {\n    var parentIndex = index - 1 >>> 1;\n    var parent = heap[parentIndex];\n\n    if (compare(parent, node) > 0) {\n      // The parent is larger. Swap positions.\n      heap[parentIndex] = node;\n      heap[index] = parent;\n      index = parentIndex;\n    } else {\n      // The parent is smaller. Exit.\n      return;\n    }\n  }\n}\n\nfunction siftDown(heap, node, i) {\n  var index = i;\n  var length = heap.length;\n  var halfLength = length >>> 1;\n\n  while (index < halfLength) {\n    var leftIndex = (index + 1) * 2 - 1;\n    var left = heap[leftIndex];\n    var rightIndex = leftIndex + 1;\n    var right = heap[rightIndex]; // If the left or right node is smaller, swap with the smaller of those.\n\n    if (compare(left, node) < 0) {\n      if (rightIndex < length && compare(right, left) < 0) {\n        heap[index] = right;\n        heap[rightIndex] = node;\n        index = rightIndex;\n      } else {\n        heap[index] = left;\n        heap[leftIndex] = node;\n        index = leftIndex;\n      }\n    } else if (rightIndex < length && compare(right, node) < 0) {\n      heap[index] = right;\n      heap[rightIndex] = node;\n      index = rightIndex;\n    } else {\n      // Neither child is smaller. Exit.\n      return;\n    }\n  }\n}\n\nfunction compare(a, b) {\n  // Compare sort index first, then task id.\n  var diff = a.sortIndex - b.sortIndex;\n  return diff !== 0 ? diff : a.id - b.id;\n}\n\n// TODO: Use symbols?\nvar ImmediatePriority = 1;\nvar UserBlockingPriority = 2;\nvar NormalPriority = 3;\nvar LowPriority = 4;\nvar IdlePriority = 5;\n\nfunction markTaskErrored(task, ms) {\n}\n\n/* eslint-disable no-var */\n\nvar hasPerformanceNow = typeof performance === 'object' && typeof performance.now === 'function';\n\nif (hasPerformanceNow) {\n  var localPerformance = performance;\n\n  exports.unstable_now = function () {\n    return localPerformance.now();\n  };\n} else {\n  var localDate = Date;\n  var initialTime = localDate.now();\n\n  exports.unstable_now = function () {\n    return localDate.now() - initialTime;\n  };\n} // Max 31 bit integer. The max integer size in V8 for 32-bit systems.\n// Math.pow(2, 30) - 1\n// 0b111111111111111111111111111111\n\n\nvar maxSigned31BitInt = 1073741823; // Times out immediately\n\nvar IMMEDIATE_PRIORITY_TIMEOUT = -1; // Eventually times out\n\nvar USER_BLOCKING_PRIORITY_TIMEOUT = 250;\nvar NORMAL_PRIORITY_TIMEOUT = 5000;\nvar LOW_PRIORITY_TIMEOUT = 10000; // Never times out\n\nvar IDLE_PRIORITY_TIMEOUT = maxSigned31BitInt; // Tasks are stored on a min heap\n\nvar taskQueue = [];\nvar timerQueue = []; // Incrementing id counter. Used to maintain insertion order.\n\nvar taskIdCounter = 1; // Pausing the scheduler is useful for debugging.\nvar currentTask = null;\nvar currentPriorityLevel = NormalPriority; // This is set while performing work, to prevent re-entrance.\n\nvar isPerformingWork = false;\nvar isHostCallbackScheduled = false;\nvar isHostTimeoutScheduled = false; // Capture local references to native APIs, in case a polyfill overrides them.\n\nvar localSetTimeout = typeof setTimeout === 'function' ? setTimeout : null;\nvar localClearTimeout = typeof clearTimeout === 'function' ? clearTimeout : null;\nvar localSetImmediate = typeof setImmediate !== 'undefined' ? setImmediate : null; // IE and Node.js + jsdom\n\nvar isInputPending = typeof navigator !== 'undefined' && navigator.scheduling !== undefined && navigator.scheduling.isInputPending !== undefined ? navigator.scheduling.isInputPending.bind(navigator.scheduling) : null;\n\nfunction advanceTimers(currentTime) {\n  // Check for tasks that are no longer delayed and add them to the queue.\n  var timer = peek(timerQueue);\n\n  while (timer !== null) {\n    if (timer.callback === null) {\n      // Timer was cancelled.\n      pop(timerQueue);\n    } else if (timer.startTime <= currentTime) {\n      // Timer fired. Transfer to the task queue.\n      pop(timerQueue);\n      timer.sortIndex = timer.expirationTime;\n      push(taskQueue, timer);\n    } else {\n      // Remaining timers are pending.\n      return;\n    }\n\n    timer = peek(timerQueue);\n  }\n}\n\nfunction handleTimeout(currentTime) {\n  isHostTimeoutScheduled = false;\n  advanceTimers(currentTime);\n\n  if (!isHostCallbackScheduled) {\n    if (peek(taskQueue) !== null) {\n      isHostCallbackScheduled = true;\n      requestHostCallback(flushWork);\n    } else {\n      var firstTimer = peek(timerQueue);\n\n      if (firstTimer !== null) {\n        requestHostTimeout(handleTimeout, firstTimer.startTime - currentTime);\n      }\n    }\n  }\n}\n\nfunction flushWork(hasTimeRemaining, initialTime) {\n\n\n  isHostCallbackScheduled = false;\n\n  if (isHostTimeoutScheduled) {\n    // We scheduled a timeout but it's no longer needed. 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currentTime);\n    }\n\n    return false;\n  }\n}\n\nfunction unstable_runWithPriority(priorityLevel, eventHandler) {\n  switch (priorityLevel) {\n    case ImmediatePriority:\n    case UserBlockingPriority:\n    case NormalPriority:\n    case LowPriority:\n    case IdlePriority:\n      break;\n\n    default:\n      priorityLevel = NormalPriority;\n  }\n\n  var previousPriorityLevel = currentPriorityLevel;\n  currentPriorityLevel = priorityLevel;\n\n  try {\n    return eventHandler();\n  } finally {\n    currentPriorityLevel = previousPriorityLevel;\n  }\n}\n\nfunction unstable_next(eventHandler) {\n  var priorityLevel;\n\n  switch (currentPriorityLevel) {\n    case ImmediatePriority:\n    case UserBlockingPriority:\n    case NormalPriority:\n      // Shift down to normal priority\n      priorityLevel = NormalPriority;\n      break;\n\n    default:\n      // Anything lower than normal priority should remain at the current level.\n      priorityLevel = currentPriorityLevel;\n      break;\n  }\n\n  var previousPriorityLevel = currentPriorityLevel;\n  currentPriorityLevel = priorityLevel;\n\n  try {\n    return eventHandler();\n  } finally {\n    currentPriorityLevel = previousPriorityLevel;\n  }\n}\n\nfunction unstable_wrapCallback(callback) {\n  var parentPriorityLevel = currentPriorityLevel;\n  return function () {\n    // This is a fork of runWithPriority, inlined for performance.\n    var previousPriorityLevel = currentPriorityLevel;\n    currentPriorityLevel = parentPriorityLevel;\n\n    try {\n      return callback.apply(this, arguments);\n    } finally {\n      currentPriorityLevel = previousPriorityLevel;\n    }\n  };\n}\n\nfunction unstable_scheduleCallback(priorityLevel, callback, options) {\n  var currentTime = exports.unstable_now();\n  var startTime;\n\n  if (typeof options === 'object' && options !== null) {\n    var delay = options.delay;\n\n    if (typeof delay === 'number' && delay > 0) {\n      startTime = currentTime + delay;\n    } else {\n      startTime = currentTime;\n    }\n  } else {\n    startTime = currentTime;\n  }\n\n  var timeout;\n\n  switch (priorityLevel) {\n    case ImmediatePriority:\n      timeout = IMMEDIATE_PRIORITY_TIMEOUT;\n      break;\n\n    case UserBlockingPriority:\n      timeout = USER_BLOCKING_PRIORITY_TIMEOUT;\n      break;\n\n    case IdlePriority:\n      timeout = IDLE_PRIORITY_TIMEOUT;\n      break;\n\n    case LowPriority:\n      timeout = LOW_PRIORITY_TIMEOUT;\n      break;\n\n    case NormalPriority:\n    default:\n      timeout = NORMAL_PRIORITY_TIMEOUT;\n      break;\n  }\n\n  var expirationTime = startTime + timeout;\n  var newTask = {\n    id: taskIdCounter++,\n    callback: callback,\n    priorityLevel: priorityLevel,\n    startTime: startTime,\n    expirationTime: expirationTime,\n    sortIndex: -1\n  };\n\n  if (startTime > currentTime) {\n    // This is a delayed task.\n    newTask.sortIndex = startTime;\n    push(timerQueue, newTask);\n\n    if (peek(taskQueue) === null && newTask === peek(timerQueue)) {\n      // All tasks are delayed, and this is the task with the earliest delay.\n      if (isHostTimeoutScheduled) {\n        // Cancel an existing timeout.\n        cancelHostTimeout();\n      } else {\n        isHostTimeoutScheduled = true;\n      } // Schedule a timeout.\n\n\n      requestHostTimeout(handleTimeout, startTime - 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Instead, if `scheduledHostCallback` errors, then\n    // `hasMoreWork` will remain true, and we'll continue the work loop.\n\n    var hasMoreWork = true;\n\n    try {\n      hasMoreWork = scheduledHostCallback(hasTimeRemaining, currentTime);\n    } finally {\n      if (hasMoreWork) {\n        // If there's more work, schedule the next message event at the end\n        // of the preceding one.\n        schedulePerformWorkUntilDeadline();\n      } else {\n        isMessageLoopRunning = false;\n        scheduledHostCallback = null;\n      }\n    }\n  } else {\n    isMessageLoopRunning = false;\n  } // Yielding to the browser will give it a chance to paint, so we can\n};\n\nvar schedulePerformWorkUntilDeadline;\n\nif (typeof localSetImmediate === 'function') {\n  // Node.js and old IE.\n  // There's a few reasons for why we prefer setImmediate.\n  //\n  // Unlike MessageChannel, it doesn't prevent a Node.js process from exiting.\n  // (Even though this is a DOM fork of the Scheduler, you could get here\n  // with a mix of Node.js 15+, which has a MessageChannel, and jsdom.)\n  // https://github.com/facebook/react/issues/20756\n  //\n  // But also, it runs earlier which is the semantic we want.\n  // If other browsers ever implement it, it's better to use it.\n  // Although both of these would be inferior to native scheduling.\n  schedulePerformWorkUntilDeadline = function () {\n    localSetImmediate(performWorkUntilDeadline);\n  };\n} else if (typeof MessageChannel !== 'undefined') {\n  // DOM and Worker environments.\n  // We prefer MessageChannel because of the 4ms setTimeout clamping.\n  var channel = new MessageChannel();\n  var port = channel.port2;\n  channel.port1.onmessage = performWorkUntilDeadline;\n\n  schedulePerformWorkUntilDeadline = function () {\n    port.postMessage(null);\n  };\n} else {\n  // We should only fallback here in non-browser environments.\n  schedulePerformWorkUntilDeadline = function () {\n    localSetTimeout(performWorkUntilDeadline, 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