firefox/devtools/client/shared/vendor/react-test-renderer.mjs

/** @license React v16.8.6
 * react-test-renderer.production.min.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.
 */
import React from 'resource://devtools/client/shared/vendor/react.mjs';

/**
 * Use invariant() to assert state which your program assumes to be true.
 *
 * Provide sprintf-style format (only %s is supported) and arguments
 * to provide information about what broke and what you were
 * expecting.
 *
 * The invariant message will be stripped in production, but the invariant
 * will remain to ensure logic does not differ in production.
 */

function invariant(condition, format, a, b, c, d, e, f) {
  if (!condition) {
    var error = void 0;
    if (format === undefined) {
      error = new Error('Minified exception occurred; use the non-minified dev environment ' + 'for the full error message and additional helpful warnings.');
    } else {
      var args = [a, b, c, d, e, f];
      var argIndex = 0;
      error = new Error(format.replace(/%s/g, function () {
        return args[argIndex++];
      }));
      error.name = 'Invariant Violation';
    }

    error.framesToPop = 1; // we don't care about invariant's own frame
    throw error;
  }
}

// Relying on the `invariant()` implementation lets us
// preserve the format and params in the www builds.
/**
 * WARNING: DO NOT manually require this module.
 * This is a replacement for `invariant(...)` used by the error code system
 * and will _only_ be required by the corresponding babel pass.
 * It always throws.
 */
function reactProdInvariant(code) {
  var argCount = arguments.length - 1;
  var url = 'https://reactjs.org/docs/error-decoder.html?invariant=' + code;
  for (var argIdx = 0; argIdx < argCount; argIdx++) {
    url += '&args[]=' + encodeURIComponent(arguments[argIdx + 1]);
  }
  // Rename it so that our build transform doesn't attempt
  // to replace this invariant() call with reactProdInvariant().
  var i = invariant;
  i(false,
  // The error code is intentionally part of the message (and
  // not the format argument) so that we could deduplicate
  // different errors in logs based on the code.
  'Minified React error #' + code + '; visit %s ' + 'for the full message or use the non-minified dev environment ' + 'for full errors and additional helpful warnings. ', url);
}

var ReactInternals = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

var _assign = ReactInternals.assign;

/**
 * Similar to invariant but only logs a warning if the condition is not met.
 * This can be used to log issues in development environments in critical
 * paths. Removing the logging code for production environments will keep the
 * same logic and follow the same code paths.
 */

/**
 * `ReactInstanceMap` maintains a mapping from a public facing stateful
 * instance (key) and the internal representation (value). This allows public
 * methods to accept the user facing instance as an argument and map them back
 * to internal methods.
 *
 * Note that this module is currently shared and assumed to be stateless.
 * If this becomes an actual Map, that will break.
 */

/**
 * This API should be called `delete` but we'd have to make sure to always
 * transform these to strings for IE support. When this transform is fully
 * supported we can rename it.
 */


function get(key) {
  return key._reactInternalFiber;
}



function set(key, value) {
  key._reactInternalFiber = value;
}

var ReactSharedInternals = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

// Prevent newer renderers from RTE when used with older react package versions.
// Current owner and dispatcher used to share the same ref,
// but PR #14548 split them out to better support the react-debug-tools package.
if (!ReactSharedInternals.hasOwnProperty('ReactCurrentDispatcher')) {
  ReactSharedInternals.ReactCurrentDispatcher = {
    current: null
  };
}

// The Symbol used to tag the ReactElement-like types. If there is no native Symbol
// nor polyfill, then a plain number is used for performance.
var hasSymbol = typeof Symbol === 'function' && Symbol.for;

var REACT_ELEMENT_TYPE = hasSymbol ? Symbol.for('react.element') : 0xeac7;
var REACT_PORTAL_TYPE = hasSymbol ? Symbol.for('react.portal') : 0xeaca;
var REACT_FRAGMENT_TYPE = hasSymbol ? Symbol.for('react.fragment') : 0xeacb;
var REACT_STRICT_MODE_TYPE = hasSymbol ? Symbol.for('react.strict_mode') : 0xeacc;
var REACT_PROFILER_TYPE = hasSymbol ? Symbol.for('react.profiler') : 0xead2;
var REACT_PROVIDER_TYPE = hasSymbol ? Symbol.for('react.provider') : 0xeacd;
var REACT_CONTEXT_TYPE = hasSymbol ? Symbol.for('react.context') : 0xeace;

var REACT_CONCURRENT_MODE_TYPE = hasSymbol ? Symbol.for('react.concurrent_mode') : 0xeacf;
var REACT_FORWARD_REF_TYPE = hasSymbol ? Symbol.for('react.forward_ref') : 0xead0;
var REACT_SUSPENSE_TYPE = hasSymbol ? Symbol.for('react.suspense') : 0xead1;
var REACT_MEMO_TYPE = hasSymbol ? Symbol.for('react.memo') : 0xead3;
var REACT_LAZY_TYPE = hasSymbol ? Symbol.for('react.lazy') : 0xead4;

var MAYBE_ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
var FAUX_ITERATOR_SYMBOL = '@@iterator';

function getIteratorFn(maybeIterable) {
  if (maybeIterable === null || typeof maybeIterable !== 'object') {
    return null;
  }
  var maybeIterator = MAYBE_ITERATOR_SYMBOL && maybeIterable[MAYBE_ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL];
  if (typeof maybeIterator === 'function') {
    return maybeIterator;
  }
  return null;
}

var Pending = 0;
var Resolved = 1;
var Rejected = 2;

function refineResolvedLazyComponent(lazyComponent) {
  return lazyComponent._status === Resolved ? lazyComponent._result : null;
}

function getWrappedName(outerType, innerType, wrapperName) {
  var functionName = innerType.displayName || innerType.name || '';
  return outerType.displayName || (functionName !== '' ? wrapperName + '(' + functionName + ')' : wrapperName);
}

function getComponentName(type) {
  if (type == null) {
    // Host root, text node or just invalid type.
    return null;
  }
  if (typeof type === 'function') {
    return type.displayName || type.name || null;
  }
  if (typeof type === 'string') {
    return type;
  }
  switch (type) {
    case REACT_CONCURRENT_MODE_TYPE:
      return 'ConcurrentMode';
    case REACT_FRAGMENT_TYPE:
      return 'Fragment';
    case REACT_PORTAL_TYPE:
      return 'Portal';
    case REACT_PROFILER_TYPE:
      return 'Profiler';
    case REACT_STRICT_MODE_TYPE:
      return 'StrictMode';
    case REACT_SUSPENSE_TYPE:
      return 'Suspense';
  }
  if (typeof type === 'object') {
    switch (type.$$typeof) {
      case REACT_CONTEXT_TYPE:
        return 'Context.Consumer';
      case REACT_PROVIDER_TYPE:
        return 'Context.Provider';
      case REACT_FORWARD_REF_TYPE:
        return getWrappedName(type, type.render, 'ForwardRef');
      case REACT_MEMO_TYPE:
        return getComponentName(type.type);
      case REACT_LAZY_TYPE:
        {
          var thenable = type;
          var resolvedThenable = refineResolvedLazyComponent(thenable);
          if (resolvedThenable) {
            return getComponentName(resolvedThenable);
          }
        }
    }
  }
  return null;
}

var FunctionComponent = 0;
var ClassComponent = 1;
var IndeterminateComponent = 2; // Before we know whether it is function or class
var HostRoot = 3; // Root of a host tree. Could be nested inside another node.
var HostPortal = 4; // A subtree. Could be an entry point to a different renderer.
var HostComponent = 5;
var HostText = 6;
var Fragment = 7;
var Mode = 8;
var ContextConsumer = 9;
var ContextProvider = 10;
var ForwardRef = 11;
var Profiler = 12;
var SuspenseComponent = 13;
var MemoComponent = 14;
var SimpleMemoComponent = 15;
var LazyComponent = 16;
var IncompleteClassComponent = 17;
var DehydratedSuspenseComponent = 18;

// Don't change these two values. They're used by React Dev Tools.
var NoEffect = /*              */0;
var PerformedWork = /*         */1;

// You can change the rest (and add more).
var Placement = /*             */2;
var Update = /*                */4;
var PlacementAndUpdate = /*    */6;
var Deletion = /*              */8;
var ContentReset = /*          */16;
var Callback = /*              */32;
var DidCapture = /*            */64;
var Ref = /*                   */128;
var Snapshot = /*              */256;
var Passive = /*               */512;

// Passive & Update & Callback & Ref & Snapshot
var LifecycleEffectMask = /*   */932;

// Union of all host effects
var HostEffectMask = /*        */1023;

var Incomplete = /*            */1024;
var ShouldCapture = /*         */2048;

var ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;

var MOUNTING = 1;
var MOUNTED = 2;
var UNMOUNTED = 3;

function isFiberMountedImpl(fiber) {
  var node = fiber;
  if (!fiber.alternate) {
    // If there is no alternate, this might be a new tree that isn't inserted
    // yet. If it is, then it will have a pending insertion effect on it.
    if ((node.effectTag & Placement) !== NoEffect) {
      return MOUNTING;
    }
    while (node.return) {
      node = node.return;
      if ((node.effectTag & Placement) !== NoEffect) {
        return MOUNTING;
      }
    }
  } else {
    while (node.return) {
      node = node.return;
    }
  }
  if (node.tag === HostRoot) {
    // TODO: Check if this was a nested HostRoot when used with
    // renderContainerIntoSubtree.
    return MOUNTED;
  }
  // If we didn't hit the root, that means that we're in an disconnected tree
  // that has been unmounted.
  return UNMOUNTED;
}

function isFiberMounted(fiber) {
  return isFiberMountedImpl(fiber) === MOUNTED;
}

function isMounted(component) {
  var fiber = get(component);
  if (!fiber) {
    return false;
  }
  return isFiberMountedImpl(fiber) === MOUNTED;
}

function assertIsMounted(fiber) {
  !(isFiberMountedImpl(fiber) === MOUNTED) ? reactProdInvariant('188') : void 0;
}

function findCurrentFiberUsingSlowPath(fiber) {
  var alternate = fiber.alternate;
  if (!alternate) {
    // If there is no alternate, then we only need to check if it is mounted.
    var state = isFiberMountedImpl(fiber);
    !(state !== UNMOUNTED) ? reactProdInvariant('188') : void 0;
    if (state === MOUNTING) {
      return null;
    }
    return fiber;
  }
  // If we have two possible branches, we'll walk backwards up to the root
  // to see what path the root points to. On the way we may hit one of the
  // special cases and we'll deal with them.
  var a = fiber;
  var b = alternate;
  while (true) {
    var parentA = a.return;
    var parentB = parentA ? parentA.alternate : null;
    if (!parentA || !parentB) {
      // We're at the root.
      break;
    }

    // If both copies of the parent fiber point to the same child, we can
    // assume that the child is current. This happens when we bailout on low
    // priority: the bailed out fiber's child reuses the current child.
    if (parentA.child === parentB.child) {
      var child = parentA.child;
      while (child) {
        if (child === a) {
          // We've determined that A is the current branch.
          assertIsMounted(parentA);
          return fiber;
        }
        if (child === b) {
          // We've determined that B is the current branch.
          assertIsMounted(parentA);
          return alternate;
        }
        child = child.sibling;
      }
      // We should never have an alternate for any mounting node. So the only
      // way this could possibly happen is if this was unmounted, if at all.
      reactProdInvariant('188');
    }

    if (a.return !== b.return) {
      // The return pointer of A and the return pointer of B point to different
      // fibers. We assume that return pointers never criss-cross, so A must
      // belong to the child set of A.return, and B must belong to the child
      // set of B.return.
      a = parentA;
      b = parentB;
    } else {
      // The return pointers point to the same fiber. We'll have to use the
      // default, slow path: scan the child sets of each parent alternate to see
      // which child belongs to which set.
      //
      // Search parent A's child set
      var didFindChild = false;
      var _child = parentA.child;
      while (_child) {
        if (_child === a) {
          didFindChild = true;
          a = parentA;
          b = parentB;
          break;
        }
        if (_child === b) {
          didFindChild = true;
          b = parentA;
          a = parentB;
          break;
        }
        _child = _child.sibling;
      }
      if (!didFindChild) {
        // Search parent B's child set
        _child = parentB.child;
        while (_child) {
          if (_child === a) {
            didFindChild = true;
            a = parentB;
            b = parentA;
            break;
          }
          if (_child === b) {
            didFindChild = true;
            b = parentB;
            a = parentA;
            break;
          }
          _child = _child.sibling;
        }
        !didFindChild ? reactProdInvariant('189') : void 0;
      }
    }

    !(a.alternate === b) ? reactProdInvariant('190') : void 0;
  }
  // If the root is not a host container, we're in a disconnected tree. I.e.
  // unmounted.
  !(a.tag === HostRoot) ? reactProdInvariant('188') : void 0;
  if (a.stateNode.current === a) {
    // We've determined that A is the current branch.
    return fiber;
  }
  // Otherwise B has to be current branch.
  return alternate;
}

function findCurrentHostFiber(parent) {
  var currentParent = findCurrentFiberUsingSlowPath(parent);
  if (!currentParent) {
    return null;
  }

  // Next we'll drill down this component to find the first HostComponent/Text.
  var node = currentParent;
  while (true) {
    if (node.tag === HostComponent || node.tag === HostText) {
      return node;
    } else if (node.child) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    if (node === currentParent) {
      return null;
    }
    while (!node.sibling) {
      if (!node.return || node.return === currentParent) {
        return null;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
  // Flow needs the return null here, but ESLint complains about it.
  // eslint-disable-next-line no-unreachable
  return null;
}

// Current virtual time
var nowImplementation = function () {
  return 0;
};
var scheduledCallback = null;
var yieldedValues = [];

var didStop = false;
var expectedNumberOfYields = -1;

function scheduleDeferredCallback$1(callback, options) {
  scheduledCallback = callback;
  var fakeCallbackId = 0;
  return fakeCallbackId;
}

function cancelDeferredCallback$1(timeoutID) {
  scheduledCallback = null;
}

function setNowImplementation(implementation) {
  nowImplementation = implementation;
}

function shouldYield$1() {
  if (expectedNumberOfYields !== -1 && yieldedValues.length >= expectedNumberOfYields) {
    // We yielded at least as many values as expected. Stop rendering.
    didStop = true;
    return true;
  }
  // Keep rendering.
  return false;
}

function flushAll() {
  yieldedValues = [];
  while (scheduledCallback !== null) {
    var cb = scheduledCallback;
    scheduledCallback = null;
    cb();
  }
  var values = yieldedValues;
  yieldedValues = [];
  return values;
}

function flushNumberOfYields(count) {
  expectedNumberOfYields = count;
  didStop = false;
  yieldedValues = [];
  try {
    while (scheduledCallback !== null && !didStop) {
      var cb = scheduledCallback;
      scheduledCallback = null;
      cb();
    }
    return yieldedValues;
  } finally {
    expectedNumberOfYields = -1;
    didStop = false;
    yieldedValues = [];
  }
}

function yieldValue(value) {
  yieldedValues.push(value);
}

function clearYields() {
  var values = yieldedValues;
  yieldedValues = [];
  return values;
}

// Renderers that don't support persistence
// can re-export everything from this module.

function shim() {
  reactProdInvariant('270');
}

// Persistence (when unsupported)
var supportsPersistence = false;
var cloneInstance = shim;
var createContainerChildSet = shim;
var appendChildToContainerChildSet = shim;
var finalizeContainerChildren = shim;
var replaceContainerChildren = shim;
var cloneHiddenInstance = shim;
var cloneUnhiddenInstance = shim;
var createHiddenTextInstance = shim;

// Renderers that don't support hydration
// can re-export everything from this module.

function shim$1() {
  reactProdInvariant('305');
}

// Hydration (when unsupported)

var supportsHydration = false;
var canHydrateInstance = shim$1;
var canHydrateTextInstance = shim$1;
var canHydrateSuspenseInstance = shim$1;
var getNextHydratableSibling = shim$1;
var getFirstHydratableChild = shim$1;
var hydrateInstance = shim$1;
var hydrateTextInstance = shim$1;
var getNextHydratableInstanceAfterSuspenseInstance = shim$1;
var clearSuspenseBoundary = shim$1;
var clearSuspenseBoundaryFromContainer = shim$1;

var NO_CONTEXT = {};
var UPDATE_SIGNAL = {};
function getPublicInstance(inst) {
  switch (inst.tag) {
    case 'INSTANCE':
      var _createNodeMock = inst.rootContainerInstance.createNodeMock;
      return _createNodeMock({
        type: inst.type,
        props: inst.props
      });
    default:
      return inst;
  }
}

function appendChild(parentInstance, child) {
  var index = parentInstance.children.indexOf(child);
  if (index !== -1) {
    parentInstance.children.splice(index, 1);
  }
  parentInstance.children.push(child);
}

function insertBefore(parentInstance, child, beforeChild) {
  var index = parentInstance.children.indexOf(child);
  if (index !== -1) {
    parentInstance.children.splice(index, 1);
  }
  var beforeIndex = parentInstance.children.indexOf(beforeChild);
  parentInstance.children.splice(beforeIndex, 0, child);
}

function removeChild(parentInstance, child) {
  var index = parentInstance.children.indexOf(child);
  parentInstance.children.splice(index, 1);
}

function getRootHostContext(rootContainerInstance) {
  return NO_CONTEXT;
}

function getChildHostContext(parentHostContext, type, rootContainerInstance) {
  return NO_CONTEXT;
}

function prepareForCommit(containerInfo) {
  // noop
}

function resetAfterCommit(containerInfo) {
  // noop
}

function createInstance(type, props, rootContainerInstance, hostContext, internalInstanceHandle) {
  return {
    type: type,
    props: props,
    isHidden: false,
    children: [],
    rootContainerInstance: rootContainerInstance,
    tag: 'INSTANCE'
  };
}

function appendInitialChild(parentInstance, child) {
  var index = parentInstance.children.indexOf(child);
  if (index !== -1) {
    parentInstance.children.splice(index, 1);
  }
  parentInstance.children.push(child);
}

function finalizeInitialChildren(testElement, type, props, rootContainerInstance, hostContext) {
  return false;
}

function prepareUpdate(testElement, type, oldProps, newProps, rootContainerInstance, hostContext) {
  return UPDATE_SIGNAL;
}

function shouldSetTextContent(type, props) {
  return false;
}

function shouldDeprioritizeSubtree(type, props) {
  return false;
}

function createTextInstance(text, rootContainerInstance, hostContext, internalInstanceHandle) {
  return {
    text: text,
    isHidden: false,
    tag: 'TEXT'
  };
}

var isPrimaryRenderer = false;
// This approach enables `now` to be mocked by tests,
// Even after the reconciler has initialized and read host config values.
var now = function () {
  return nowImplementation();
};
var scheduleDeferredCallback$$1 = scheduleDeferredCallback$1;
var cancelDeferredCallback$$1 = cancelDeferredCallback$1;
var shouldYield$$1 = shouldYield$1;

var scheduleTimeout = setTimeout;
var cancelTimeout = clearTimeout;
var noTimeout = -1;
var schedulePassiveEffects = scheduleDeferredCallback$$1;
var cancelPassiveEffects = cancelDeferredCallback$$1;

// -------------------
//     Mutation
// -------------------

var supportsMutation = true;

function commitUpdate(instance, updatePayload, type, oldProps, newProps, internalInstanceHandle) {
  instance.type = type;
  instance.props = newProps;
}



function commitTextUpdate(textInstance, oldText, newText) {
  textInstance.text = newText;
}

function resetTextContent(testElement) {
  // noop
}

var appendChildToContainer = appendChild;
var insertInContainerBefore = insertBefore;
var removeChildFromContainer = removeChild;

function hideInstance(instance) {
  instance.isHidden = true;
}

function hideTextInstance(textInstance) {
  textInstance.isHidden = true;
}

function unhideInstance(instance, props) {
  instance.isHidden = false;
}

function unhideTextInstance(textInstance, text) {
  textInstance.isHidden = false;
}

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

var BEFORE_SLASH_RE = /^(.*)[\\\/]/;

var describeComponentFrame = function (name, source, ownerName) {
  var sourceInfo = '';
  if (source) {
    var path = source.fileName;
    var fileName = path.replace(BEFORE_SLASH_RE, '');
    sourceInfo = ' (at ' + fileName + ':' + source.lineNumber + ')';
  } else if (ownerName) {
    sourceInfo = ' (created by ' + ownerName + ')';
  }
  return '\n    in ' + (name || 'Unknown') + sourceInfo;
};

var ReactDebugCurrentFrame = ReactSharedInternals.ReactDebugCurrentFrame;

function describeFiber(fiber) {
  switch (fiber.tag) {
    case HostRoot:
    case HostPortal:
    case HostText:
    case Fragment:
    case ContextProvider:
    case ContextConsumer:
      return '';
    default:
      var owner = fiber._debugOwner;
      var source = fiber._debugSource;
      var name = getComponentName(fiber.type);
      var ownerName = null;
      if (owner) {
        ownerName = getComponentName(owner.type);
      }
      return describeComponentFrame(name, source, ownerName);
  }
}

function getStackByFiberInDevAndProd(workInProgress) {
  var info = '';
  var node = workInProgress;
  do {
    info += describeFiber(node);
    node = node.return;
  } while (node);
  return info;
}

var enableUserTimingAPI = false;


var enableProfilerTimer = false;
var enableSchedulerTracing = false;
var enableSuspenseServerRenderer = false;





// Only used in www builds.

// Prefix measurements so that it's possible to filter them.
// Longer prefixes are hard to read in DevTools.
var reactEmoji = '\u269B';
var warningEmoji = '\u26D4';
var supportsUserTiming = typeof performance !== 'undefined' && typeof performance.mark === 'function' && typeof performance.clearMarks === 'function' && typeof performance.measure === 'function' && typeof performance.clearMeasures === 'function';

// Keep track of current fiber so that we know the path to unwind on pause.
// TODO: this looks the same as nextUnitOfWork in scheduler. Can we unify them?
var currentFiber = null;
// If we're in the middle of user code, which fiber and method is it?
// Reusing `currentFiber` would be confusing for this because user code fiber
// can change during commit phase too, but we don't need to unwind it (since
// lifecycles in the commit phase don't resemble a tree).
var currentPhase = null;
var currentPhaseFiber = null;
// Did lifecycle hook schedule an update? This is often a performance problem,
// so we will keep track of it, and include it in the report.
// Track commits caused by cascading updates.
var isCommitting = false;
var hasScheduledUpdateInCurrentCommit = false;
var hasScheduledUpdateInCurrentPhase = false;
var commitCountInCurrentWorkLoop = 0;
var effectCountInCurrentCommit = 0;
var isWaitingForCallback = false;
// During commits, we only show a measurement once per method name
// to avoid stretch the commit phase with measurement overhead.
var labelsInCurrentCommit = new Set();

var formatMarkName = function (markName) {
  return reactEmoji + ' ' + markName;
};

var formatLabel = function (label, warning) {
  var prefix = warning ? warningEmoji + ' ' : reactEmoji + ' ';
  var suffix = warning ? ' Warning: ' + warning : '';
  return '' + prefix + label + suffix;
};

var beginMark = function (markName) {
  performance.mark(formatMarkName(markName));
};

var clearMark = function (markName) {
  performance.clearMarks(formatMarkName(markName));
};

var endMark = function (label, markName, warning) {
  var formattedMarkName = formatMarkName(markName);
  var formattedLabel = formatLabel(label, warning);
  try {
    performance.measure(formattedLabel, formattedMarkName);
  } catch (err) {}
  // If previous mark was missing for some reason, this will throw.
  // This could only happen if React crashed in an unexpected place earlier.
  // Don't pile on with more errors.

  // Clear marks immediately to avoid growing buffer.
  performance.clearMarks(formattedMarkName);
  performance.clearMeasures(formattedLabel);
};

var getFiberMarkName = function (label, debugID) {
  return label + ' (#' + debugID + ')';
};

var getFiberLabel = function (componentName, isMounted, phase) {
  if (phase === null) {
    // These are composite component total time measurements.
    return componentName + ' [' + (isMounted ? 'update' : 'mount') + ']';
  } else {
    // Composite component methods.
    return componentName + '.' + phase;
  }
};

var beginFiberMark = function (fiber, phase) {
  var componentName = getComponentName(fiber.type) || 'Unknown';
  var debugID = fiber._debugID;
  var isMounted = fiber.alternate !== null;
  var label = getFiberLabel(componentName, isMounted, phase);

  if (isCommitting && labelsInCurrentCommit.has(label)) {
    // During the commit phase, we don't show duplicate labels because
    // there is a fixed overhead for every measurement, and we don't
    // want to stretch the commit phase beyond necessary.
    return false;
  }
  labelsInCurrentCommit.add(label);

  var markName = getFiberMarkName(label, debugID);
  beginMark(markName);
  return true;
};

var clearFiberMark = function (fiber, phase) {
  var componentName = getComponentName(fiber.type) || 'Unknown';
  var debugID = fiber._debugID;
  var isMounted = fiber.alternate !== null;
  var label = getFiberLabel(componentName, isMounted, phase);
  var markName = getFiberMarkName(label, debugID);
  clearMark(markName);
};

var endFiberMark = function (fiber, phase, warning) {
  var componentName = getComponentName(fiber.type) || 'Unknown';
  var debugID = fiber._debugID;
  var isMounted = fiber.alternate !== null;
  var label = getFiberLabel(componentName, isMounted, phase);
  var markName = getFiberMarkName(label, debugID);
  endMark(label, markName, warning);
};

var shouldIgnoreFiber = function (fiber) {
  // Host components should be skipped in the timeline.
  // We could check typeof fiber.type, but does this work with RN?
  switch (fiber.tag) {
    case HostRoot:
    case HostComponent:
    case HostText:
    case HostPortal:
    case Fragment:
    case ContextProvider:
    case ContextConsumer:
    case Mode:
      return true;
    default:
      return false;
  }
};

var clearPendingPhaseMeasurement = function () {
  if (currentPhase !== null && currentPhaseFiber !== null) {
    clearFiberMark(currentPhaseFiber, currentPhase);
  }
  currentPhaseFiber = null;
  currentPhase = null;
  hasScheduledUpdateInCurrentPhase = false;
};

var pauseTimers = function () {
  // Stops all currently active measurements so that they can be resumed
  // if we continue in a later deferred loop from the same unit of work.
  var fiber = currentFiber;
  while (fiber) {
    if (fiber._debugIsCurrentlyTiming) {
      endFiberMark(fiber, null, null);
    }
    fiber = fiber.return;
  }
};

var resumeTimersRecursively = function (fiber) {
  if (fiber.return !== null) {
    resumeTimersRecursively(fiber.return);
  }
  if (fiber._debugIsCurrentlyTiming) {
    beginFiberMark(fiber, null);
  }
};

var resumeTimers = function () {
  // Resumes all measurements that were active during the last deferred loop.
  if (currentFiber !== null) {
    resumeTimersRecursively(currentFiber);
  }
};

function recordEffect() {
  if (enableUserTimingAPI) {
    effectCountInCurrentCommit++;
  }
}

function recordScheduleUpdate() {
  if (enableUserTimingAPI) {
    if (isCommitting) {
      hasScheduledUpdateInCurrentCommit = true;
    }
    if (currentPhase !== null && currentPhase !== 'componentWillMount' && currentPhase !== 'componentWillReceiveProps') {
      hasScheduledUpdateInCurrentPhase = true;
    }
  }
}

function startRequestCallbackTimer() {
  if (enableUserTimingAPI) {
    if (supportsUserTiming && !isWaitingForCallback) {
      isWaitingForCallback = true;
      beginMark('(Waiting for async callback...)');
    }
  }
}

function stopRequestCallbackTimer(didExpire, expirationTime) {
  if (enableUserTimingAPI) {
    if (supportsUserTiming) {
      isWaitingForCallback = false;
      var warning = didExpire ? 'React was blocked by main thread' : null;
      endMark('(Waiting for async callback... will force flush in ' + expirationTime + ' ms)', '(Waiting for async callback...)', warning);
    }
  }
}

function startWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // If we pause, this is the fiber to unwind from.
    currentFiber = fiber;
    if (!beginFiberMark(fiber, null)) {
      return;
    }
    fiber._debugIsCurrentlyTiming = true;
  }
}

function cancelWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // Remember we shouldn't complete measurement for this fiber.
    // Otherwise flamechart will be deep even for small updates.
    fiber._debugIsCurrentlyTiming = false;
    clearFiberMark(fiber, null);
  }
}

function stopWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // If we pause, its parent is the fiber to unwind from.
    currentFiber = fiber.return;
    if (!fiber._debugIsCurrentlyTiming) {
      return;
    }
    fiber._debugIsCurrentlyTiming = false;
    endFiberMark(fiber, null, null);
  }
}

function stopFailedWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // If we pause, its parent is the fiber to unwind from.
    currentFiber = fiber.return;
    if (!fiber._debugIsCurrentlyTiming) {
      return;
    }
    fiber._debugIsCurrentlyTiming = false;
    var warning = fiber.tag === SuspenseComponent || fiber.tag === DehydratedSuspenseComponent ? 'Rendering was suspended' : 'An error was thrown inside this error boundary';
    endFiberMark(fiber, null, warning);
  }
}

function startPhaseTimer(fiber, phase) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    clearPendingPhaseMeasurement();
    if (!beginFiberMark(fiber, phase)) {
      return;
    }
    currentPhaseFiber = fiber;
    currentPhase = phase;
  }
}

function stopPhaseTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    if (currentPhase !== null && currentPhaseFiber !== null) {
      var warning = hasScheduledUpdateInCurrentPhase ? 'Scheduled a cascading update' : null;
      endFiberMark(currentPhaseFiber, currentPhase, warning);
    }
    currentPhase = null;
    currentPhaseFiber = null;
  }
}

function startWorkLoopTimer(nextUnitOfWork) {
  if (enableUserTimingAPI) {
    currentFiber = nextUnitOfWork;
    if (!supportsUserTiming) {
      return;
    }
    commitCountInCurrentWorkLoop = 0;
    // This is top level call.
    // Any other measurements are performed within.
    beginMark('(React Tree Reconciliation)');
    // Resume any measurements that were in progress during the last loop.
    resumeTimers();
  }
}

function stopWorkLoopTimer(interruptedBy, didCompleteRoot) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    var warning = null;
    if (interruptedBy !== null) {
      if (interruptedBy.tag === HostRoot) {
        warning = 'A top-level update interrupted the previous render';
      } else {
        var componentName = getComponentName(interruptedBy.type) || 'Unknown';
        warning = 'An update to ' + componentName + ' interrupted the previous render';
      }
    } else if (commitCountInCurrentWorkLoop > 1) {
      warning = 'There were cascading updates';
    }
    commitCountInCurrentWorkLoop = 0;
    var label = didCompleteRoot ? '(React Tree Reconciliation: Completed Root)' : '(React Tree Reconciliation: Yielded)';
    // Pause any measurements until the next loop.
    pauseTimers();
    endMark(label, '(React Tree Reconciliation)', warning);
  }
}

function startCommitTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    isCommitting = true;
    hasScheduledUpdateInCurrentCommit = false;
    labelsInCurrentCommit.clear();
    beginMark('(Committing Changes)');
  }
}

function stopCommitTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }

    var warning = null;
    if (hasScheduledUpdateInCurrentCommit) {
      warning = 'Lifecycle hook scheduled a cascading update';
    } else if (commitCountInCurrentWorkLoop > 0) {
      warning = 'Caused by a cascading update in earlier commit';
    }
    hasScheduledUpdateInCurrentCommit = false;
    commitCountInCurrentWorkLoop++;
    isCommitting = false;
    labelsInCurrentCommit.clear();

    endMark('(Committing Changes)', '(Committing Changes)', warning);
  }
}

function startCommitSnapshotEffectsTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    effectCountInCurrentCommit = 0;
    beginMark('(Committing Snapshot Effects)');
  }
}

function stopCommitSnapshotEffectsTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    var count = effectCountInCurrentCommit;
    effectCountInCurrentCommit = 0;
    endMark('(Committing Snapshot Effects: ' + count + ' Total)', '(Committing Snapshot Effects)', null);
  }
}

function startCommitHostEffectsTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    effectCountInCurrentCommit = 0;
    beginMark('(Committing Host Effects)');
  }
}

function stopCommitHostEffectsTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    var count = effectCountInCurrentCommit;
    effectCountInCurrentCommit = 0;
    endMark('(Committing Host Effects: ' + count + ' Total)', '(Committing Host Effects)', null);
  }
}

function startCommitLifeCyclesTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    effectCountInCurrentCommit = 0;
    beginMark('(Calling Lifecycle Methods)');
  }
}

function stopCommitLifeCyclesTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    var count = effectCountInCurrentCommit;
    effectCountInCurrentCommit = 0;
    endMark('(Calling Lifecycle Methods: ' + count + ' Total)', '(Calling Lifecycle Methods)', null);
  }
}

var valueStack = [];

var index = -1;

function createCursor(defaultValue) {
  return {
    current: defaultValue
  };
}

function pop(cursor, fiber) {
  if (index < 0) {
    return;
  }

  cursor.current = valueStack[index];

  valueStack[index] = null;

  index--;
}

function push(cursor, value, fiber) {
  index++;

  valueStack[index] = cursor.current;

  cursor.current = value;
}

var emptyContextObject = {};
// A cursor to the current merged context object on the stack.
var contextStackCursor = createCursor(emptyContextObject);
// A cursor to a boolean indicating whether the context has changed.
var didPerformWorkStackCursor = createCursor(false);
// Keep track of the previous context object that was on the stack.
// We use this to get access to the parent context after we have already
// pushed the next context provider, and now need to merge their contexts.
var previousContext = emptyContextObject;

function getUnmaskedContext(workInProgress, Component, didPushOwnContextIfProvider) {
  if (didPushOwnContextIfProvider && isContextProvider(Component)) {
    // If the fiber is a context provider itself, when we read its context
    // we may have already pushed its own child context on the stack. A context
    // provider should not "see" its own child context. Therefore we read the
    // previous (parent) context instead for a context provider.
    return previousContext;
  }
  return contextStackCursor.current;
}

function cacheContext(workInProgress, unmaskedContext, maskedContext) {
  var instance = workInProgress.stateNode;
  instance.__reactInternalMemoizedUnmaskedChildContext = unmaskedContext;
  instance.__reactInternalMemoizedMaskedChildContext = maskedContext;
}

function getMaskedContext(workInProgress, unmaskedContext) {
  var type = workInProgress.type;
  var contextTypes = type.contextTypes;
  if (!contextTypes) {
    return emptyContextObject;
  }

  // Avoid recreating masked context unless unmasked context has changed.
  // Failing to do this will result in unnecessary calls to componentWillReceiveProps.
  // This may trigger infinite loops if componentWillReceiveProps calls setState.
  var instance = workInProgress.stateNode;
  if (instance && instance.__reactInternalMemoizedUnmaskedChildContext === unmaskedContext) {
    return instance.__reactInternalMemoizedMaskedChildContext;
  }

  var context = {};
  for (var key in contextTypes) {
    context[key] = unmaskedContext[key];
  }

  if (instance) {
    cacheContext(workInProgress, unmaskedContext, context);
  }

  return context;
}

function hasContextChanged() {
  return didPerformWorkStackCursor.current;
}

function isContextProvider(type) {
  var childContextTypes = type.childContextTypes;
  return childContextTypes !== null && childContextTypes !== undefined;
}

function popContext(fiber) {
  pop(didPerformWorkStackCursor, fiber);
  pop(contextStackCursor, fiber);
}

function popTopLevelContextObject(fiber) {
  pop(didPerformWorkStackCursor, fiber);
  pop(contextStackCursor, fiber);
}

function pushTopLevelContextObject(fiber, context, didChange) {
  !(contextStackCursor.current === emptyContextObject) ? reactProdInvariant('168') : void 0;

  push(contextStackCursor, context, fiber);
  push(didPerformWorkStackCursor, didChange, fiber);
}

function processChildContext(fiber, type, parentContext) {
  var instance = fiber.stateNode;
  var childContextTypes = type.childContextTypes;

  // TODO (bvaughn) Replace this behavior with an invariant() in the future.
  // It has only been added in Fiber to match the (unintentional) behavior in Stack.
  if (typeof instance.getChildContext !== 'function') {
    return parentContext;
  }

  var childContext = void 0;
  startPhaseTimer(fiber, 'getChildContext');
  childContext = instance.getChildContext();
  stopPhaseTimer();
  for (var contextKey in childContext) {
    !(contextKey in childContextTypes) ? reactProdInvariant('108', getComponentName(type) || 'Unknown', contextKey) : void 0;
  }
  return _assign({}, parentContext, childContext);
}

function pushContextProvider(workInProgress) {
  var instance = workInProgress.stateNode;
  // We push the context as early as possible to ensure stack integrity.
  // If the instance does not exist yet, we will push null at first,
  // and replace it on the stack later when invalidating the context.
  var memoizedMergedChildContext = instance && instance.__reactInternalMemoizedMergedChildContext || emptyContextObject;

  // Remember the parent context so we can merge with it later.
  // Inherit the parent's did-perform-work value to avoid inadvertently blocking updates.
  previousContext = contextStackCursor.current;
  push(contextStackCursor, memoizedMergedChildContext, workInProgress);
  push(didPerformWorkStackCursor, didPerformWorkStackCursor.current, workInProgress);

  return true;
}

function invalidateContextProvider(workInProgress, type, didChange) {
  var instance = workInProgress.stateNode;
  !instance ? reactProdInvariant('169') : void 0;

  if (didChange) {
    // Merge parent and own context.
    // Skip this if we're not updating due to sCU.
    // This avoids unnecessarily recomputing memoized values.
    var mergedContext = processChildContext(workInProgress, type, previousContext);
    instance.__reactInternalMemoizedMergedChildContext = mergedContext;

    // Replace the old (or empty) context with the new one.
    // It is important to unwind the context in the reverse order.
    pop(didPerformWorkStackCursor, workInProgress);
    pop(contextStackCursor, workInProgress);
    // Now push the new context and mark that it has changed.
    push(contextStackCursor, mergedContext, workInProgress);
    push(didPerformWorkStackCursor, didChange, workInProgress);
  } else {
    pop(didPerformWorkStackCursor, workInProgress);
    push(didPerformWorkStackCursor, didChange, workInProgress);
  }
}

function findCurrentUnmaskedContext(fiber) {
  // Currently this is only used with renderSubtreeIntoContainer; not sure if it
  // makes sense elsewhere
  !(isFiberMounted(fiber) && fiber.tag === ClassComponent) ? reactProdInvariant('170') : void 0;

  var node = fiber;
  do {
    switch (node.tag) {
      case HostRoot:
        return node.stateNode.context;
      case ClassComponent:
        {
          var Component = node.type;
          if (isContextProvider(Component)) {
            return node.stateNode.__reactInternalMemoizedMergedChildContext;
          }
          break;
        }
    }
    node = node.return;
  } while (node !== null);
  reactProdInvariant('171');
}

var onCommitFiberRoot = null;
var onCommitFiberUnmount = null;
function catchErrors(fn) {
  return function (arg) {
    try {
      return fn(arg);
    } catch (err) {
      
    }
  };
}

var isDevToolsPresent = typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined';

function injectInternals(internals) {
  if (typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ === 'undefined') {
    // No DevTools
    return false;
  }
  var hook = __REACT_DEVTOOLS_GLOBAL_HOOK__;
  if (hook.isDisabled) {
    // This isn't a real property on the hook, but it can be set to opt out
    // of DevTools integration and associated warnings and logs.
    // https://github.com/facebook/react/issues/3877
    return true;
  }
  if (!hook.supportsFiber) {
    return true;
  }
  try {
    var rendererID = hook.inject(internals);
    // We have successfully injected, so now it is safe to set up hooks.
    onCommitFiberRoot = catchErrors(function (root) {
      return hook.onCommitFiberRoot(rendererID, root);
    });
    onCommitFiberUnmount = catchErrors(function (fiber) {
      return hook.onCommitFiberUnmount(rendererID, fiber);
    });
  } catch (err) {
    // Catch all errors because it is unsafe to throw during initialization.
    
  }
  // DevTools exists
  return true;
}

function onCommitRoot(root) {
  if (typeof onCommitFiberRoot === 'function') {
    onCommitFiberRoot(root);
  }
}

function onCommitUnmount(fiber) {
  if (typeof onCommitFiberUnmount === 'function') {
    onCommitFiberUnmount(fiber);
  }
}

// Max 31 bit integer. The max integer size in V8 for 32-bit systems.
// Math.pow(2, 30) - 1
// 0b111111111111111111111111111111
var maxSigned31BitInt = 1073741823;

var NoWork = 0;
var Never = 1;
var Sync = maxSigned31BitInt;

var UNIT_SIZE = 10;
var MAGIC_NUMBER_OFFSET = maxSigned31BitInt - 1;

// 1 unit of expiration time represents 10ms.
function msToExpirationTime(ms) {
  // Always add an offset so that we don't clash with the magic number for NoWork.
  return MAGIC_NUMBER_OFFSET - (ms / UNIT_SIZE | 0);
}

function expirationTimeToMs(expirationTime) {
  return (MAGIC_NUMBER_OFFSET - expirationTime) * UNIT_SIZE;
}

function ceiling(num, precision) {
  return ((num / precision | 0) + 1) * precision;
}

function computeExpirationBucket(currentTime, expirationInMs, bucketSizeMs) {
  return MAGIC_NUMBER_OFFSET - ceiling(MAGIC_NUMBER_OFFSET - currentTime + expirationInMs / UNIT_SIZE, bucketSizeMs / UNIT_SIZE);
}

var LOW_PRIORITY_EXPIRATION = 5000;
var LOW_PRIORITY_BATCH_SIZE = 250;

function computeAsyncExpiration(currentTime) {
  return computeExpirationBucket(currentTime, LOW_PRIORITY_EXPIRATION, LOW_PRIORITY_BATCH_SIZE);
}

// We intentionally set a higher expiration time for interactive updates in
// dev than in production.
//
// If the main thread is being blocked so long that you hit the expiration,
// it's a problem that could be solved with better scheduling.
//
// People will be more likely to notice this and fix it with the long
// expiration time in development.
//
// In production we opt for better UX at the risk of masking scheduling
// problems, by expiring fast.
var HIGH_PRIORITY_EXPIRATION = 150;
var HIGH_PRIORITY_BATCH_SIZE = 100;

function computeInteractiveExpiration(currentTime) {
  return computeExpirationBucket(currentTime, HIGH_PRIORITY_EXPIRATION, HIGH_PRIORITY_BATCH_SIZE);
}

var NoContext = 0;
var ConcurrentMode = 1;
var StrictMode = 2;
var ProfileMode = 4;

function FiberNode(tag, pendingProps, key, mode) {
  // Instance
  this.tag = tag;
  this.key = key;
  this.elementType = null;
  this.type = null;
  this.stateNode = null;

  // Fiber
  this.return = null;
  this.child = null;
  this.sibling = null;
  this.index = 0;

  this.ref = null;

  this.pendingProps = pendingProps;
  this.memoizedProps = null;
  this.updateQueue = null;
  this.memoizedState = null;
  this.contextDependencies = null;

  this.mode = mode;

  // Effects
  this.effectTag = NoEffect;
  this.nextEffect = null;

  this.firstEffect = null;
  this.lastEffect = null;

  this.expirationTime = NoWork;
  this.childExpirationTime = NoWork;

  this.alternate = null;

  if (enableProfilerTimer) {
    // Note: The following is done to avoid a v8 performance cliff.
    //
    // Initializing the fields below to smis and later updating them with
    // double values will cause Fibers to end up having separate shapes.
    // This behavior/bug has something to do with Object.preventExtension().
    // Fortunately this only impacts DEV builds.
    // Unfortunately it makes React unusably slow for some applications.
    // To work around this, initialize the fields below with doubles.
    //
    // Learn more about this here:
    // https://github.com/facebook/react/issues/14365
    // https://bugs.chromium.org/p/v8/issues/detail?id=8538
    this.actualDuration = Number.NaN;
    this.actualStartTime = Number.NaN;
    this.selfBaseDuration = Number.NaN;
    this.treeBaseDuration = Number.NaN;

    // It's okay to replace the initial doubles with smis after initialization.
    // This won't trigger the performance cliff mentioned above,
    // and it simplifies other profiler code (including DevTools).
    this.actualDuration = 0;
    this.actualStartTime = -1;
    this.selfBaseDuration = 0;
    this.treeBaseDuration = 0;
  }

  
}

// This is a constructor function, rather than a POJO constructor, still
// please ensure we do the following:
// 1) Nobody should add any instance methods on this. Instance methods can be
//    more difficult to predict when they get optimized and they are almost
//    never inlined properly in static compilers.
// 2) Nobody should rely on `instanceof Fiber` for type testing. We should
//    always know when it is a fiber.
// 3) We might want to experiment with using numeric keys since they are easier
//    to optimize in a non-JIT environment.
// 4) We can easily go from a constructor to a createFiber object literal if that
//    is faster.
// 5) It should be easy to port this to a C struct and keep a C implementation
//    compatible.
var createFiber = function (tag, pendingProps, key, mode) {
  // $FlowFixMe: the shapes are exact here but Flow doesn't like constructors
  return new FiberNode(tag, pendingProps, key, mode);
};

function shouldConstruct(Component) {
  var prototype = Component.prototype;
  return !!(prototype && prototype.isReactComponent);
}

function isSimpleFunctionComponent(type) {
  return typeof type === 'function' && !shouldConstruct(type) && type.defaultProps === undefined;
}

function resolveLazyComponentTag(Component) {
  if (typeof Component === 'function') {
    return shouldConstruct(Component) ? ClassComponent : FunctionComponent;
  } else if (Component !== undefined && Component !== null) {
    var $$typeof = Component.$$typeof;
    if ($$typeof === REACT_FORWARD_REF_TYPE) {
      return ForwardRef;
    }
    if ($$typeof === REACT_MEMO_TYPE) {
      return MemoComponent;
    }
  }
  return IndeterminateComponent;
}

// This is used to create an alternate fiber to do work on.
function createWorkInProgress(current, pendingProps, expirationTime) {
  var workInProgress = current.alternate;
  if (workInProgress === null) {
    // We use a double buffering pooling technique because we know that we'll
    // only ever need at most two versions of a tree. We pool the "other" unused
    // node that we're free to reuse. This is lazily created to avoid allocating
    // extra objects for things that are never updated. It also allow us to
    // reclaim the extra memory if needed.
    workInProgress = createFiber(current.tag, pendingProps, current.key, current.mode);
    workInProgress.elementType = current.elementType;
    workInProgress.type = current.type;
    workInProgress.stateNode = current.stateNode;

    workInProgress.alternate = current;
    current.alternate = workInProgress;
  } else {
    workInProgress.pendingProps = pendingProps;

    // We already have an alternate.
    // Reset the effect tag.
    workInProgress.effectTag = NoEffect;

    // The effect list is no longer valid.
    workInProgress.nextEffect = null;
    workInProgress.firstEffect = null;
    workInProgress.lastEffect = null;

    if (enableProfilerTimer) {
      // We intentionally reset, rather than copy, actualDuration & actualStartTime.
      // This prevents time from endlessly accumulating in new commits.
      // This has the downside of resetting values for different priority renders,
      // But works for yielding (the common case) and should support resuming.
      workInProgress.actualDuration = 0;
      workInProgress.actualStartTime = -1;
    }
  }

  workInProgress.childExpirationTime = current.childExpirationTime;
  workInProgress.expirationTime = current.expirationTime;

  workInProgress.child = current.child;
  workInProgress.memoizedProps = current.memoizedProps;
  workInProgress.memoizedState = current.memoizedState;
  workInProgress.updateQueue = current.updateQueue;
  workInProgress.contextDependencies = current.contextDependencies;

  // These will be overridden during the parent's reconciliation
  workInProgress.sibling = current.sibling;
  workInProgress.index = current.index;
  workInProgress.ref = current.ref;

  if (enableProfilerTimer) {
    workInProgress.selfBaseDuration = current.selfBaseDuration;
    workInProgress.treeBaseDuration = current.treeBaseDuration;
  }

  return workInProgress;
}

function createHostRootFiber(isConcurrent) {
  var mode = isConcurrent ? ConcurrentMode | StrictMode : NoContext;

  if (enableProfilerTimer && isDevToolsPresent) {
    // Always collect profile timings when DevTools are present.
    // This enables DevTools to start capturing timing at any point–
    // Without some nodes in the tree having empty base times.
    mode |= ProfileMode;
  }

  return createFiber(HostRoot, null, null, mode);
}

function createFiberFromTypeAndProps(type, // React$ElementType
key, pendingProps, owner, mode, expirationTime) {
  var fiber = void 0;

  var fiberTag = IndeterminateComponent;
  // The resolved type is set if we know what the final type will be. I.e. it's not lazy.
  var resolvedType = type;
  if (typeof type === 'function') {
    if (shouldConstruct(type)) {
      fiberTag = ClassComponent;
    }
  } else if (typeof type === 'string') {
    fiberTag = HostComponent;
  } else {
    getTag: switch (type) {
      case REACT_FRAGMENT_TYPE:
        return createFiberFromFragment(pendingProps.children, mode, expirationTime, key);
      case REACT_CONCURRENT_MODE_TYPE:
        return createFiberFromMode(pendingProps, mode | ConcurrentMode | StrictMode, expirationTime, key);
      case REACT_STRICT_MODE_TYPE:
        return createFiberFromMode(pendingProps, mode | StrictMode, expirationTime, key);
      case REACT_PROFILER_TYPE:
        return createFiberFromProfiler(pendingProps, mode, expirationTime, key);
      case REACT_SUSPENSE_TYPE:
        return createFiberFromSuspense(pendingProps, mode, expirationTime, key);
      default:
        {
          if (typeof type === 'object' && type !== null) {
            switch (type.$$typeof) {
              case REACT_PROVIDER_TYPE:
                fiberTag = ContextProvider;
                break getTag;
              case REACT_CONTEXT_TYPE:
                // This is a consumer
                fiberTag = ContextConsumer;
                break getTag;
              case REACT_FORWARD_REF_TYPE:
                fiberTag = ForwardRef;
                break getTag;
              case REACT_MEMO_TYPE:
                fiberTag = MemoComponent;
                break getTag;
              case REACT_LAZY_TYPE:
                fiberTag = LazyComponent;
                resolvedType = null;
                break getTag;
            }
          }
          var info = '';
          reactProdInvariant('130', type == null ? type : typeof type, info);
        }
    }
  }

  fiber = createFiber(fiberTag, pendingProps, key, mode);
  fiber.elementType = type;
  fiber.type = resolvedType;
  fiber.expirationTime = expirationTime;

  return fiber;
}

function createFiberFromElement(element, mode, expirationTime) {
  var owner = null;
  var type = element.type;
  var key = element.key;
  var pendingProps = element.props;
  var fiber = createFiberFromTypeAndProps(type, key, pendingProps, owner, mode, expirationTime);
  return fiber;
}

function createFiberFromFragment(elements, mode, expirationTime, key) {
  var fiber = createFiber(Fragment, elements, key, mode);
  fiber.expirationTime = expirationTime;
  return fiber;
}

function createFiberFromProfiler(pendingProps, mode, expirationTime, key) {
  var fiber = createFiber(Profiler, pendingProps, key, mode | ProfileMode);
  // TODO: The Profiler fiber shouldn't have a type. It has a tag.
  fiber.elementType = REACT_PROFILER_TYPE;
  fiber.type = REACT_PROFILER_TYPE;
  fiber.expirationTime = expirationTime;

  return fiber;
}

function createFiberFromMode(pendingProps, mode, expirationTime, key) {
  var fiber = createFiber(Mode, pendingProps, key, mode);

  // TODO: The Mode fiber shouldn't have a type. It has a tag.
  var type = (mode & ConcurrentMode) === NoContext ? REACT_STRICT_MODE_TYPE : REACT_CONCURRENT_MODE_TYPE;
  fiber.elementType = type;
  fiber.type = type;

  fiber.expirationTime = expirationTime;
  return fiber;
}

function createFiberFromSuspense(pendingProps, mode, expirationTime, key) {
  var fiber = createFiber(SuspenseComponent, pendingProps, key, mode);

  // TODO: The SuspenseComponent fiber shouldn't have a type. It has a tag.
  var type = REACT_SUSPENSE_TYPE;
  fiber.elementType = type;
  fiber.type = type;

  fiber.expirationTime = expirationTime;
  return fiber;
}

function createFiberFromText(content, mode, expirationTime) {
  var fiber = createFiber(HostText, content, null, mode);
  fiber.expirationTime = expirationTime;
  return fiber;
}

function createFiberFromHostInstanceForDeletion() {
  var fiber = createFiber(HostComponent, null, null, NoContext);
  // TODO: These should not need a type.
  fiber.elementType = 'DELETED';
  fiber.type = 'DELETED';
  return fiber;
}

function createFiberFromPortal(portal, mode, expirationTime) {
  var pendingProps = portal.children !== null ? portal.children : [];
  var fiber = createFiber(HostPortal, pendingProps, portal.key, mode);
  fiber.expirationTime = expirationTime;
  fiber.stateNode = {
    containerInfo: portal.containerInfo,
    pendingChildren: null, // Used by persistent updates
    implementation: portal.implementation
  };
  return fiber;
}

// Used for stashing WIP properties to replay failed work in DEV.

var ReactInternals$1 = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

var _ReactInternals$Sched = ReactInternals$1.SchedulerTracing;
var __interactionsRef = _ReactInternals$Sched.__interactionsRef;
var __subscriberRef = _ReactInternals$Sched.__subscriberRef;
var unstable_clear = _ReactInternals$Sched.unstable_clear;
var unstable_getCurrent = _ReactInternals$Sched.unstable_getCurrent;
var unstable_getThreadID = _ReactInternals$Sched.unstable_getThreadID;
var unstable_subscribe = _ReactInternals$Sched.unstable_subscribe;
var unstable_trace = _ReactInternals$Sched.unstable_trace;
var unstable_unsubscribe = _ReactInternals$Sched.unstable_unsubscribe;
var unstable_wrap = _ReactInternals$Sched.unstable_wrap;

// TODO: This should be lifted into the renderer.


// The following attributes are only used by interaction tracing builds.
// They enable interactions to be associated with their async work,
// And expose interaction metadata to the React DevTools Profiler plugin.
// Note that these attributes are only defined when the enableSchedulerTracing flag is enabled.


// Exported FiberRoot type includes all properties,
// To avoid requiring potentially error-prone :any casts throughout the project.
// Profiling properties are only safe to access in profiling builds (when enableSchedulerTracing is true).
// The types are defined separately within this file to ensure they stay in sync.
// (We don't have to use an inline :any cast when enableSchedulerTracing is disabled.)


function createFiberRoot(containerInfo, isConcurrent, hydrate) {
  // Cyclic construction. This cheats the type system right now because
  // stateNode is any.
  var uninitializedFiber = createHostRootFiber(isConcurrent);

  var root = void 0;
  if (enableSchedulerTracing) {
    root = {
      current: uninitializedFiber,
      containerInfo: containerInfo,
      pendingChildren: null,

      earliestPendingTime: NoWork,
      latestPendingTime: NoWork,
      earliestSuspendedTime: NoWork,
      latestSuspendedTime: NoWork,
      latestPingedTime: NoWork,

      pingCache: null,

      didError: false,

      pendingCommitExpirationTime: NoWork,
      finishedWork: null,
      timeoutHandle: noTimeout,
      context: null,
      pendingContext: null,
      hydrate: hydrate,
      nextExpirationTimeToWorkOn: NoWork,
      expirationTime: NoWork,
      firstBatch: null,
      nextScheduledRoot: null,

      interactionThreadID: unstable_getThreadID(),
      memoizedInteractions: new Set(),
      pendingInteractionMap: new Map()
    };
  } else {
    root = {
      current: uninitializedFiber,
      containerInfo: containerInfo,
      pendingChildren: null,

      pingCache: null,

      earliestPendingTime: NoWork,
      latestPendingTime: NoWork,
      earliestSuspendedTime: NoWork,
      latestSuspendedTime: NoWork,
      latestPingedTime: NoWork,

      didError: false,

      pendingCommitExpirationTime: NoWork,
      finishedWork: null,
      timeoutHandle: noTimeout,
      context: null,
      pendingContext: null,
      hydrate: hydrate,
      nextExpirationTimeToWorkOn: NoWork,
      expirationTime: NoWork,
      firstBatch: null,
      nextScheduledRoot: null
    };
  }

  uninitializedFiber.stateNode = root;

  // The reason for the way the Flow types are structured in this file,
  // Is to avoid needing :any casts everywhere interaction tracing fields are used.
  // Unfortunately that requires an :any cast for non-interaction tracing capable builds.
  // $FlowFixMe Remove this :any cast and replace it with something better.
  return root;
}

var ReactInternals$2 = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

var _ReactInternals$Sched$1 = ReactInternals$2.Scheduler;
var unstable_cancelCallback = _ReactInternals$Sched$1.unstable_cancelCallback;
var unstable_now = _ReactInternals$Sched$1.unstable_now;
var unstable_scheduleCallback = _ReactInternals$Sched$1.unstable_scheduleCallback;
var unstable_shouldYield = _ReactInternals$Sched$1.unstable_shouldYield;
var unstable_getFirstCallbackNode = _ReactInternals$Sched$1.unstable_getFirstCallbackNode;
var unstable_runWithPriority = _ReactInternals$Sched$1.unstable_runWithPriority;
var unstable_next = _ReactInternals$Sched$1.unstable_next;
var unstable_continueExecution = _ReactInternals$Sched$1.unstable_continueExecution;
var unstable_pauseExecution = _ReactInternals$Sched$1.unstable_pauseExecution;
var unstable_getCurrentPriorityLevel = _ReactInternals$Sched$1.unstable_getCurrentPriorityLevel;
var unstable_ImmediatePriority = _ReactInternals$Sched$1.unstable_ImmediatePriority;
var unstable_UserBlockingPriority = _ReactInternals$Sched$1.unstable_UserBlockingPriority;
var unstable_NormalPriority = _ReactInternals$Sched$1.unstable_NormalPriority;
var unstable_LowPriority = _ReactInternals$Sched$1.unstable_LowPriority;
var unstable_IdlePriority = _ReactInternals$Sched$1.unstable_IdlePriority;

/**
 * Call a function while guarding against errors that happens within it.
 * Returns an error if it throws, otherwise null.
 *
 * In production, this is implemented using a try-catch. The reason we don't
 * use a try-catch directly is so that we can swap out a different
 * implementation in DEV mode.
 *
 * @param {String} name of the guard to use for logging or debugging
 * @param {Function} func The function to invoke
 * @param {*} context The context to use when calling the function
 * @param {...*} args Arguments for function
 */


/**
 * Same as invokeGuardedCallback, but instead of returning an error, it stores
 * it in a global so it can be rethrown by `rethrowCaughtError` later.
 * TODO: See if caughtError and rethrowError can be unified.
 *
 * @param {String} name of the guard to use for logging or debugging
 * @param {Function} func The function to invoke
 * @param {*} context The context to use when calling the function
 * @param {...*} args Arguments for function
 */


/**
 * During execution of guarded functions we will capture the first error which
 * we will rethrow to be handled by the top level error handler.
 */

/**
 * Forked from fbjs/warning:
 * https://github.com/facebook/fbjs/blob/e66ba20ad5be433eb54423f2b097d829324d9de6/packages/fbjs/src/__forks__/warning.js
 *
 * Only change is we use console.warn instead of console.error,
 * and do nothing when 'console' is not supported.
 * This really simplifies the code.
 * ---
 * Similar to invariant but only logs a warning if the condition is not met.
 * This can be used to log issues in development environments in critical
 * paths. Removing the logging code for production environments will keep the
 * same logic and follow the same code paths.
 */

// This lets us hook into Fiber to debug what it's doing.
// See https://github.com/facebook/react/pull/8033.
// This is not part of the public API, not even for React DevTools.
// You may only inject a debugTool if you work on React Fiber itself.

// TODO: Offscreen updates should never suspend. However, a promise that
// suspended inside an offscreen subtree should be able to ping at the priority
// of the outer render.

function markPendingPriorityLevel(root, expirationTime) {
  // If there's a gap between completing a failed root and retrying it,
  // additional updates may be scheduled. Clear `didError`, in case the update
  // is sufficient to fix the error.
  root.didError = false;

  // Update the latest and earliest pending times
  var earliestPendingTime = root.earliestPendingTime;
  if (earliestPendingTime === NoWork) {
    // No other pending updates.
    root.earliestPendingTime = root.latestPendingTime = expirationTime;
  } else {
    if (earliestPendingTime < expirationTime) {
      // This is the earliest pending update.
      root.earliestPendingTime = expirationTime;
    } else {
      var latestPendingTime = root.latestPendingTime;
      if (latestPendingTime > expirationTime) {
        // This is the latest pending update
        root.latestPendingTime = expirationTime;
      }
    }
  }
  findNextExpirationTimeToWorkOn(expirationTime, root);
}

function markCommittedPriorityLevels(root, earliestRemainingTime) {
  root.didError = false;

  if (earliestRemainingTime === NoWork) {
    // Fast path. There's no remaining work. Clear everything.
    root.earliestPendingTime = NoWork;
    root.latestPendingTime = NoWork;
    root.earliestSuspendedTime = NoWork;
    root.latestSuspendedTime = NoWork;
    root.latestPingedTime = NoWork;
    findNextExpirationTimeToWorkOn(NoWork, root);
    return;
  }

  if (earliestRemainingTime < root.latestPingedTime) {
    root.latestPingedTime = NoWork;
  }

  // Let's see if the previous latest known pending level was just flushed.
  var latestPendingTime = root.latestPendingTime;
  if (latestPendingTime !== NoWork) {
    if (latestPendingTime > earliestRemainingTime) {
      // We've flushed all the known pending levels.
      root.earliestPendingTime = root.latestPendingTime = NoWork;
    } else {
      var earliestPendingTime = root.earliestPendingTime;
      if (earliestPendingTime > earliestRemainingTime) {
        // We've flushed the earliest known pending level. Set this to the
        // latest pending time.
        root.earliestPendingTime = root.latestPendingTime;
      }
    }
  }

  // Now let's handle the earliest remaining level in the whole tree. We need to
  // decide whether to treat it as a pending level or as suspended. Check
  // it falls within the range of known suspended levels.

  var earliestSuspendedTime = root.earliestSuspendedTime;
  if (earliestSuspendedTime === NoWork) {
    // There's no suspended work. Treat the earliest remaining level as a
    // pending level.
    markPendingPriorityLevel(root, earliestRemainingTime);
    findNextExpirationTimeToWorkOn(NoWork, root);
    return;
  }

  var latestSuspendedTime = root.latestSuspendedTime;
  if (earliestRemainingTime < latestSuspendedTime) {
    // The earliest remaining level is later than all the suspended work. That
    // means we've flushed all the suspended work.
    root.earliestSuspendedTime = NoWork;
    root.latestSuspendedTime = NoWork;
    root.latestPingedTime = NoWork;

    // There's no suspended work. Treat the earliest remaining level as a
    // pending level.
    markPendingPriorityLevel(root, earliestRemainingTime);
    findNextExpirationTimeToWorkOn(NoWork, root);
    return;
  }

  if (earliestRemainingTime > earliestSuspendedTime) {
    // The earliest remaining time is earlier than all the suspended work.
    // Treat it as a pending update.
    markPendingPriorityLevel(root, earliestRemainingTime);
    findNextExpirationTimeToWorkOn(NoWork, root);
    return;
  }

  // The earliest remaining time falls within the range of known suspended
  // levels. We should treat this as suspended work.
  findNextExpirationTimeToWorkOn(NoWork, root);
}

function hasLowerPriorityWork(root, erroredExpirationTime) {
  var latestPendingTime = root.latestPendingTime;
  var latestSuspendedTime = root.latestSuspendedTime;
  var latestPingedTime = root.latestPingedTime;
  return latestPendingTime !== NoWork && latestPendingTime < erroredExpirationTime || latestSuspendedTime !== NoWork && latestSuspendedTime < erroredExpirationTime || latestPingedTime !== NoWork && latestPingedTime < erroredExpirationTime;
}

function isPriorityLevelSuspended(root, expirationTime) {
  var earliestSuspendedTime = root.earliestSuspendedTime;
  var latestSuspendedTime = root.latestSuspendedTime;
  return earliestSuspendedTime !== NoWork && expirationTime <= earliestSuspendedTime && expirationTime >= latestSuspendedTime;
}

function markSuspendedPriorityLevel(root, suspendedTime) {
  root.didError = false;
  clearPing(root, suspendedTime);

  // First, check the known pending levels and update them if needed.
  var earliestPendingTime = root.earliestPendingTime;
  var latestPendingTime = root.latestPendingTime;
  if (earliestPendingTime === suspendedTime) {
    if (latestPendingTime === suspendedTime) {
      // Both known pending levels were suspended. Clear them.
      root.earliestPendingTime = root.latestPendingTime = NoWork;
    } else {
      // The earliest pending level was suspended. Clear by setting it to the
      // latest pending level.
      root.earliestPendingTime = latestPendingTime;
    }
  } else if (latestPendingTime === suspendedTime) {
    // The latest pending level was suspended. Clear by setting it to the
    // latest pending level.
    root.latestPendingTime = earliestPendingTime;
  }

  // Finally, update the known suspended levels.
  var earliestSuspendedTime = root.earliestSuspendedTime;
  var latestSuspendedTime = root.latestSuspendedTime;
  if (earliestSuspendedTime === NoWork) {
    // No other suspended levels.
    root.earliestSuspendedTime = root.latestSuspendedTime = suspendedTime;
  } else {
    if (earliestSuspendedTime < suspendedTime) {
      // This is the earliest suspended level.
      root.earliestSuspendedTime = suspendedTime;
    } else if (latestSuspendedTime > suspendedTime) {
      // This is the latest suspended level
      root.latestSuspendedTime = suspendedTime;
    }
  }

  findNextExpirationTimeToWorkOn(suspendedTime, root);
}

function markPingedPriorityLevel(root, pingedTime) {
  root.didError = false;

  // TODO: When we add back resuming, we need to ensure the progressed work
  // is thrown out and not reused during the restarted render. One way to
  // invalidate the progressed work is to restart at expirationTime + 1.
  var latestPingedTime = root.latestPingedTime;
  if (latestPingedTime === NoWork || latestPingedTime > pingedTime) {
    root.latestPingedTime = pingedTime;
  }
  findNextExpirationTimeToWorkOn(pingedTime, root);
}

function clearPing(root, completedTime) {
  var latestPingedTime = root.latestPingedTime;
  if (latestPingedTime >= completedTime) {
    root.latestPingedTime = NoWork;
  }
}

function findEarliestOutstandingPriorityLevel(root, renderExpirationTime) {
  var earliestExpirationTime = renderExpirationTime;

  var earliestPendingTime = root.earliestPendingTime;
  var earliestSuspendedTime = root.earliestSuspendedTime;
  if (earliestPendingTime > earliestExpirationTime) {
    earliestExpirationTime = earliestPendingTime;
  }
  if (earliestSuspendedTime > earliestExpirationTime) {
    earliestExpirationTime = earliestSuspendedTime;
  }
  return earliestExpirationTime;
}

function didExpireAtExpirationTime(root, currentTime) {
  var expirationTime = root.expirationTime;
  if (expirationTime !== NoWork && currentTime <= expirationTime) {
    // The root has expired. Flush all work up to the current time.
    root.nextExpirationTimeToWorkOn = currentTime;
  }
}

function findNextExpirationTimeToWorkOn(completedExpirationTime, root) {
  var earliestSuspendedTime = root.earliestSuspendedTime;
  var latestSuspendedTime = root.latestSuspendedTime;
  var earliestPendingTime = root.earliestPendingTime;
  var latestPingedTime = root.latestPingedTime;

  // Work on the earliest pending time. Failing that, work on the latest
  // pinged time.
  var nextExpirationTimeToWorkOn = earliestPendingTime !== NoWork ? earliestPendingTime : latestPingedTime;

  // If there is no pending or pinged work, check if there's suspended work
  // that's lower priority than what we just completed.
  if (nextExpirationTimeToWorkOn === NoWork && (completedExpirationTime === NoWork || latestSuspendedTime < completedExpirationTime)) {
    // The lowest priority suspended work is the work most likely to be
    // committed next. Let's start rendering it again, so that if it times out,
    // it's ready to commit.
    nextExpirationTimeToWorkOn = latestSuspendedTime;
  }

  var expirationTime = nextExpirationTimeToWorkOn;
  if (expirationTime !== NoWork && earliestSuspendedTime > expirationTime) {
    // Expire using the earliest known expiration time.
    expirationTime = earliestSuspendedTime;
  }

  root.nextExpirationTimeToWorkOn = nextExpirationTimeToWorkOn;
  root.expirationTime = expirationTime;
}

/**
 * inlined Object.is polyfill to avoid requiring consumers ship their own
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
 */
function is(x, y) {
  return x === y && (x !== 0 || 1 / x === 1 / y) || x !== x && y !== y // eslint-disable-line no-self-compare
  ;
}

var hasOwnProperty = Object.prototype.hasOwnProperty;

/**
 * Performs equality by iterating through keys on an object and returning false
 * when any key has values which are not strictly equal between the arguments.
 * Returns true when the values of all keys are strictly equal.
 */
function shallowEqual(objA, objB) {
  if (is(objA, objB)) {
    return true;
  }

  if (typeof objA !== 'object' || objA === null || typeof objB !== 'object' || objB === null) {
    return false;
  }

  var keysA = Object.keys(objA);
  var keysB = Object.keys(objB);

  if (keysA.length !== keysB.length) {
    return false;
  }

  // Test for A's keys different from B.
  for (var i = 0; i < keysA.length; i++) {
    if (!hasOwnProperty.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
      return false;
    }
  }

  return true;
}

function resolveDefaultProps(Component, baseProps) {
  if (Component && Component.defaultProps) {
    // Resolve default props. Taken from ReactElement
    var props = _assign({}, baseProps);
    var defaultProps = Component.defaultProps;
    for (var propName in defaultProps) {
      if (props[propName] === undefined) {
        props[propName] = defaultProps[propName];
      }
    }
    return props;
  }
  return baseProps;
}

function readLazyComponentType(lazyComponent) {
  var status = lazyComponent._status;
  var result = lazyComponent._result;
  switch (status) {
    case Resolved:
      {
        var Component = result;
        return Component;
      }
    case Rejected:
      {
        var error = result;
        throw error;
      }
    case Pending:
      {
        var thenable = result;
        throw thenable;
      }
    default:
      {
        lazyComponent._status = Pending;
        var ctor = lazyComponent._ctor;
        var _thenable = ctor();
        _thenable.then(function (moduleObject) {
          if (lazyComponent._status === Pending) {
            var defaultExport = moduleObject.default;
            lazyComponent._status = Resolved;
            lazyComponent._result = defaultExport;
          }
        }, function (error) {
          if (lazyComponent._status === Pending) {
            lazyComponent._status = Rejected;
            lazyComponent._result = error;
          }
        });
        // Handle synchronous thenables.
        switch (lazyComponent._status) {
          case Resolved:
            return lazyComponent._result;
          case Rejected:
            throw lazyComponent._result;
        }
        lazyComponent._result = _thenable;
        throw _thenable;
      }
  }
}

// React.Component uses a shared frozen object by default.
// We'll use it to determine whether we need to initialize legacy refs.
var emptyRefsObject = new React.Component().refs;

function applyDerivedStateFromProps(workInProgress, ctor, getDerivedStateFromProps, nextProps) {
  var prevState = workInProgress.memoizedState;

  var partialState = getDerivedStateFromProps(nextProps, prevState);

  var memoizedState = partialState === null || partialState === undefined ? prevState : _assign({}, prevState, partialState);
  workInProgress.memoizedState = memoizedState;

  // Once the update queue is empty, persist the derived state onto the
  // base state.
  var updateQueue = workInProgress.updateQueue;
  if (updateQueue !== null && workInProgress.expirationTime === NoWork) {
    updateQueue.baseState = memoizedState;
  }
}

var classComponentUpdater = {
  isMounted: isMounted,
  enqueueSetState: function (inst, payload, callback) {
    var fiber = get(inst);
    var currentTime = requestCurrentTime();
    var expirationTime = computeExpirationForFiber(currentTime, fiber);

    var update = createUpdate(expirationTime);
    update.payload = payload;
    if (callback !== undefined && callback !== null) {
      update.callback = callback;
    }

    flushPassiveEffects$1();
    enqueueUpdate(fiber, update);
    scheduleWork(fiber, expirationTime);
  },
  enqueueReplaceState: function (inst, payload, callback) {
    var fiber = get(inst);
    var currentTime = requestCurrentTime();
    var expirationTime = computeExpirationForFiber(currentTime, fiber);

    var update = createUpdate(expirationTime);
    update.tag = ReplaceState;
    update.payload = payload;

    if (callback !== undefined && callback !== null) {
      update.callback = callback;
    }

    flushPassiveEffects$1();
    enqueueUpdate(fiber, update);
    scheduleWork(fiber, expirationTime);
  },
  enqueueForceUpdate: function (inst, callback) {
    var fiber = get(inst);
    var currentTime = requestCurrentTime();
    var expirationTime = computeExpirationForFiber(currentTime, fiber);

    var update = createUpdate(expirationTime);
    update.tag = ForceUpdate;

    if (callback !== undefined && callback !== null) {
      update.callback = callback;
    }

    flushPassiveEffects$1();
    enqueueUpdate(fiber, update);
    scheduleWork(fiber, expirationTime);
  }
};

function checkShouldComponentUpdate(workInProgress, ctor, oldProps, newProps, oldState, newState, nextContext) {
  var instance = workInProgress.stateNode;
  if (typeof instance.shouldComponentUpdate === 'function') {
    startPhaseTimer(workInProgress, 'shouldComponentUpdate');
    var shouldUpdate = instance.shouldComponentUpdate(newProps, newState, nextContext);
    stopPhaseTimer();

    return shouldUpdate;
  }

  if (ctor.prototype && ctor.prototype.isPureReactComponent) {
    return !shallowEqual(oldProps, newProps) || !shallowEqual(oldState, newState);
  }

  return true;
}

function adoptClassInstance(workInProgress, instance) {
  instance.updater = classComponentUpdater;
  workInProgress.stateNode = instance;
  // The instance needs access to the fiber so that it can schedule updates
  set(instance, workInProgress);
  
}

function constructClassInstance(workInProgress, ctor, props, renderExpirationTime) {
  var isLegacyContextConsumer = false;
  var unmaskedContext = emptyContextObject;
  var context = null;
  var contextType = ctor.contextType;

  if (typeof contextType === 'object' && contextType !== null) {
    context = readContext(contextType);
  } else {
    unmaskedContext = getUnmaskedContext(workInProgress, ctor, true);
    var contextTypes = ctor.contextTypes;
    isLegacyContextConsumer = contextTypes !== null && contextTypes !== undefined;
    context = isLegacyContextConsumer ? getMaskedContext(workInProgress, unmaskedContext) : emptyContextObject;
  }

  // Instantiate twice to help detect side-effects.
  var instance = new ctor(props, context);
  var state = workInProgress.memoizedState = instance.state !== null && instance.state !== undefined ? instance.state : null;
  adoptClassInstance(workInProgress, instance);

  if (isLegacyContextConsumer) {
    cacheContext(workInProgress, unmaskedContext, context);
  }

  return instance;
}

function callComponentWillMount(workInProgress, instance) {
  startPhaseTimer(workInProgress, 'componentWillMount');
  var oldState = instance.state;

  if (typeof instance.componentWillMount === 'function') {
    instance.componentWillMount();
  }
  if (typeof instance.UNSAFE_componentWillMount === 'function') {
    instance.UNSAFE_componentWillMount();
  }

  stopPhaseTimer();

  if (oldState !== instance.state) {
    classComponentUpdater.enqueueReplaceState(instance, instance.state, null);
  }
}

function callComponentWillReceiveProps(workInProgress, instance, newProps, nextContext) {
  var oldState = instance.state;
  startPhaseTimer(workInProgress, 'componentWillReceiveProps');
  if (typeof instance.componentWillReceiveProps === 'function') {
    instance.componentWillReceiveProps(newProps, nextContext);
  }
  if (typeof instance.UNSAFE_componentWillReceiveProps === 'function') {
    instance.UNSAFE_componentWillReceiveProps(newProps, nextContext);
  }
  stopPhaseTimer();

  if (instance.state !== oldState) {
    classComponentUpdater.enqueueReplaceState(instance, instance.state, null);
  }
}

// Invokes the mount life-cycles on a previously never rendered instance.
function mountClassInstance(workInProgress, ctor, newProps, renderExpirationTime) {
  var instance = workInProgress.stateNode;
  instance.props = newProps;
  instance.state = workInProgress.memoizedState;
  instance.refs = emptyRefsObject;

  var contextType = ctor.contextType;
  if (typeof contextType === 'object' && contextType !== null) {
    instance.context = readContext(contextType);
  } else {
    var unmaskedContext = getUnmaskedContext(workInProgress, ctor, true);
    instance.context = getMaskedContext(workInProgress, unmaskedContext);
  }

  var updateQueue = workInProgress.updateQueue;
  if (updateQueue !== null) {
    processUpdateQueue(workInProgress, updateQueue, newProps, instance, renderExpirationTime);
    instance.state = workInProgress.memoizedState;
  }

  var getDerivedStateFromProps = ctor.getDerivedStateFromProps;
  if (typeof getDerivedStateFromProps === 'function') {
    applyDerivedStateFromProps(workInProgress, ctor, getDerivedStateFromProps, newProps);
    instance.state = workInProgress.memoizedState;
  }

  // In order to support react-lifecycles-compat polyfilled components,
  // Unsafe lifecycles should not be invoked for components using the new APIs.
  if (typeof ctor.getDerivedStateFromProps !== 'function' && typeof instance.getSnapshotBeforeUpdate !== 'function' && (typeof instance.UNSAFE_componentWillMount === 'function' || typeof instance.componentWillMount === 'function')) {
    callComponentWillMount(workInProgress, instance);
    // If we had additional state updates during this life-cycle, let's
    // process them now.
    updateQueue = workInProgress.updateQueue;
    if (updateQueue !== null) {
      processUpdateQueue(workInProgress, updateQueue, newProps, instance, renderExpirationTime);
      instance.state = workInProgress.memoizedState;
    }
  }

  if (typeof instance.componentDidMount === 'function') {
    workInProgress.effectTag |= Update;
  }
}

function resumeMountClassInstance(workInProgress, ctor, newProps, renderExpirationTime) {
  var instance = workInProgress.stateNode;

  var oldProps = workInProgress.memoizedProps;
  instance.props = oldProps;

  var oldContext = instance.context;
  var contextType = ctor.contextType;
  var nextContext = void 0;
  if (typeof contextType === 'object' && contextType !== null) {
    nextContext = readContext(contextType);
  } else {
    var nextLegacyUnmaskedContext = getUnmaskedContext(workInProgress, ctor, true);
    nextContext = getMaskedContext(workInProgress, nextLegacyUnmaskedContext);
  }

  var getDerivedStateFromProps = ctor.getDerivedStateFromProps;
  var hasNewLifecycles = typeof getDerivedStateFromProps === 'function' || typeof instance.getSnapshotBeforeUpdate === 'function';

  // Note: During these life-cycles, instance.props/instance.state are what
  // ever the previously attempted to render - not the "current". However,
  // during componentDidUpdate we pass the "current" props.

  // In order to support react-lifecycles-compat polyfilled components,
  // Unsafe lifecycles should not be invoked for components using the new APIs.
  if (!hasNewLifecycles && (typeof instance.UNSAFE_componentWillReceiveProps === 'function' || typeof instance.componentWillReceiveProps === 'function')) {
    if (oldProps !== newProps || oldContext !== nextContext) {
      callComponentWillReceiveProps(workInProgress, instance, newProps, nextContext);
    }
  }

  resetHasForceUpdateBeforeProcessing();

  var oldState = workInProgress.memoizedState;
  var newState = instance.state = oldState;
  var updateQueue = workInProgress.updateQueue;
  if (updateQueue !== null) {
    processUpdateQueue(workInProgress, updateQueue, newProps, instance, renderExpirationTime);
    newState = workInProgress.memoizedState;
  }
  if (oldProps === newProps && oldState === newState && !hasContextChanged() && !checkHasForceUpdateAfterProcessing()) {
    // If an update was already in progress, we should schedule an Update
    // effect even though we're bailing out, so that cWU/cDU are called.
    if (typeof instance.componentDidMount === 'function') {
      workInProgress.effectTag |= Update;
    }
    return false;
  }

  if (typeof getDerivedStateFromProps === 'function') {
    applyDerivedStateFromProps(workInProgress, ctor, getDerivedStateFromProps, newProps);
    newState = workInProgress.memoizedState;
  }

  var shouldUpdate = checkHasForceUpdateAfterProcessing() || checkShouldComponentUpdate(workInProgress, ctor, oldProps, newProps, oldState, newState, nextContext);

  if (shouldUpdate) {
    // In order to support react-lifecycles-compat polyfilled components,
    // Unsafe lifecycles should not be invoked for components using the new APIs.
    if (!hasNewLifecycles && (typeof instance.UNSAFE_componentWillMount === 'function' || typeof instance.componentWillMount === 'function')) {
      startPhaseTimer(workInProgress, 'componentWillMount');
      if (typeof instance.componentWillMount === 'function') {
        instance.componentWillMount();
      }
      if (typeof instance.UNSAFE_componentWillMount === 'function') {
        instance.UNSAFE_componentWillMount();
      }
      stopPhaseTimer();
    }
    if (typeof instance.componentDidMount === 'function') {
      workInProgress.effectTag |= Update;
    }
  } else {
    // If an update was already in progress, we should schedule an Update
    // effect even though we're bailing out, so that cWU/cDU are called.
    if (typeof instance.componentDidMount === 'function') {
      workInProgress.effectTag |= Update;
    }

    // If shouldComponentUpdate returned false, we should still update the
    // memoized state to indicate that this work can be reused.
    workInProgress.memoizedProps = newProps;
    workInProgress.memoizedState = newState;
  }

  // Update the existing instance's state, props, and context pointers even
  // if shouldComponentUpdate returns false.
  instance.props = newProps;
  instance.state = newState;
  instance.context = nextContext;

  return shouldUpdate;
}

// Invokes the update life-cycles and returns false if it shouldn't rerender.
function updateClassInstance(current, workInProgress, ctor, newProps, renderExpirationTime) {
  var instance = workInProgress.stateNode;

  var oldProps = workInProgress.memoizedProps;
  instance.props = workInProgress.type === workInProgress.elementType ? oldProps : resolveDefaultProps(workInProgress.type, oldProps);

  var oldContext = instance.context;
  var contextType = ctor.contextType;
  var nextContext = void 0;
  if (typeof contextType === 'object' && contextType !== null) {
    nextContext = readContext(contextType);
  } else {
    var nextUnmaskedContext = getUnmaskedContext(workInProgress, ctor, true);
    nextContext = getMaskedContext(workInProgress, nextUnmaskedContext);
  }

  var getDerivedStateFromProps = ctor.getDerivedStateFromProps;
  var hasNewLifecycles = typeof getDerivedStateFromProps === 'function' || typeof instance.getSnapshotBeforeUpdate === 'function';

  // Note: During these life-cycles, instance.props/instance.state are what
  // ever the previously attempted to render - not the "current". However,
  // during componentDidUpdate we pass the "current" props.

  // In order to support react-lifecycles-compat polyfilled components,
  // Unsafe lifecycles should not be invoked for components using the new APIs.
  if (!hasNewLifecycles && (typeof instance.UNSAFE_componentWillReceiveProps === 'function' || typeof instance.componentWillReceiveProps === 'function')) {
    if (oldProps !== newProps || oldContext !== nextContext) {
      callComponentWillReceiveProps(workInProgress, instance, newProps, nextContext);
    }
  }

  resetHasForceUpdateBeforeProcessing();

  var oldState = workInProgress.memoizedState;
  var newState = instance.state = oldState;
  var updateQueue = workInProgress.updateQueue;
  if (updateQueue !== null) {
    processUpdateQueue(workInProgress, updateQueue, newProps, instance, renderExpirationTime);
    newState = workInProgress.memoizedState;
  }

  if (oldProps === newProps && oldState === newState && !hasContextChanged() && !checkHasForceUpdateAfterProcessing()) {
    // If an update was already in progress, we should schedule an Update
    // effect even though we're bailing out, so that cWU/cDU are called.
    if (typeof instance.componentDidUpdate === 'function') {
      if (oldProps !== current.memoizedProps || oldState !== current.memoizedState) {
        workInProgress.effectTag |= Update;
      }
    }
    if (typeof instance.getSnapshotBeforeUpdate === 'function') {
      if (oldProps !== current.memoizedProps || oldState !== current.memoizedState) {
        workInProgress.effectTag |= Snapshot;
      }
    }
    return false;
  }

  if (typeof getDerivedStateFromProps === 'function') {
    applyDerivedStateFromProps(workInProgress, ctor, getDerivedStateFromProps, newProps);
    newState = workInProgress.memoizedState;
  }

  var shouldUpdate = checkHasForceUpdateAfterProcessing() || checkShouldComponentUpdate(workInProgress, ctor, oldProps, newProps, oldState, newState, nextContext);

  if (shouldUpdate) {
    // In order to support react-lifecycles-compat polyfilled components,
    // Unsafe lifecycles should not be invoked for components using the new APIs.
    if (!hasNewLifecycles && (typeof instance.UNSAFE_componentWillUpdate === 'function' || typeof instance.componentWillUpdate === 'function')) {
      startPhaseTimer(workInProgress, 'componentWillUpdate');
      if (typeof instance.componentWillUpdate === 'function') {
        instance.componentWillUpdate(newProps, newState, nextContext);
      }
      if (typeof instance.UNSAFE_componentWillUpdate === 'function') {
        instance.UNSAFE_componentWillUpdate(newProps, newState, nextContext);
      }
      stopPhaseTimer();
    }
    if (typeof instance.componentDidUpdate === 'function') {
      workInProgress.effectTag |= Update;
    }
    if (typeof instance.getSnapshotBeforeUpdate === 'function') {
      workInProgress.effectTag |= Snapshot;
    }
  } else {
    // If an update was already in progress, we should schedule an Update
    // effect even though we're bailing out, so that cWU/cDU are called.
    if (typeof instance.componentDidUpdate === 'function') {
      if (oldProps !== current.memoizedProps || oldState !== current.memoizedState) {
        workInProgress.effectTag |= Update;
      }
    }
    if (typeof instance.getSnapshotBeforeUpdate === 'function') {
      if (oldProps !== current.memoizedProps || oldState !== current.memoizedState) {
        workInProgress.effectTag |= Snapshot;
      }
    }

    // If shouldComponentUpdate returned false, we should still update the
    // memoized props/state to indicate that this work can be reused.
    workInProgress.memoizedProps = newProps;
    workInProgress.memoizedState = newState;
  }

  // Update the existing instance's state, props, and context pointers even
  // if shouldComponentUpdate returns false.
  instance.props = newProps;
  instance.state = newState;
  instance.context = nextContext;

  return shouldUpdate;
}

var isArray = Array.isArray;

function coerceRef(returnFiber, current$$1, element) {
  var mixedRef = element.ref;
  if (mixedRef !== null && typeof mixedRef !== 'function' && typeof mixedRef !== 'object') {
    if (element._owner) {
      var owner = element._owner;
      var inst = void 0;
      if (owner) {
        var ownerFiber = owner;
        !(ownerFiber.tag === ClassComponent) ? reactProdInvariant('309') : void 0;
        inst = ownerFiber.stateNode;
      }
      !inst ? reactProdInvariant('147', mixedRef) : void 0;
      var stringRef = '' + mixedRef;
      // Check if previous string ref matches new string ref
      if (current$$1 !== null && current$$1.ref !== null && typeof current$$1.ref === 'function' && current$$1.ref._stringRef === stringRef) {
        return current$$1.ref;
      }
      var ref = function (value) {
        var refs = inst.refs;
        if (refs === emptyRefsObject) {
          // This is a lazy pooled frozen object, so we need to initialize.
          refs = inst.refs = {};
        }
        if (value === null) {
          delete refs[stringRef];
        } else {
          refs[stringRef] = value;
        }
      };
      ref._stringRef = stringRef;
      return ref;
    } else {
      !(typeof mixedRef === 'string') ? reactProdInvariant('284') : void 0;
      !element._owner ? reactProdInvariant('290', mixedRef) : void 0;
    }
  }
  return mixedRef;
}

function throwOnInvalidObjectType(returnFiber, newChild) {
  if (returnFiber.type !== 'textarea') {
    var addendum = '';
    reactProdInvariant('31', Object.prototype.toString.call(newChild) === '[object Object]' ? 'object with keys {' + Object.keys(newChild).join(', ') + '}' : newChild, addendum);
  }
}

// This wrapper function exists because I expect to clone the code in each path
// to be able to optimize each path individually by branching early. This needs
// a compiler or we can do it manually. Helpers that don't need this branching
// live outside of this function.
function ChildReconciler(shouldTrackSideEffects) {
  function deleteChild(returnFiber, childToDelete) {
    if (!shouldTrackSideEffects) {
      // Noop.
      return;
    }
    // Deletions are added in reversed order so we add it to the front.
    // At this point, the return fiber's effect list is empty except for
    // deletions, so we can just append the deletion to the list. The remaining
    // effects aren't added until the complete phase. Once we implement
    // resuming, this may not be true.
    var last = returnFiber.lastEffect;
    if (last !== null) {
      last.nextEffect = childToDelete;
      returnFiber.lastEffect = childToDelete;
    } else {
      returnFiber.firstEffect = returnFiber.lastEffect = childToDelete;
    }
    childToDelete.nextEffect = null;
    childToDelete.effectTag = Deletion;
  }

  function deleteRemainingChildren(returnFiber, currentFirstChild) {
    if (!shouldTrackSideEffects) {
      // Noop.
      return null;
    }

    // TODO: For the shouldClone case, this could be micro-optimized a bit by
    // assuming that after the first child we've already added everything.
    var childToDelete = currentFirstChild;
    while (childToDelete !== null) {
      deleteChild(returnFiber, childToDelete);
      childToDelete = childToDelete.sibling;
    }
    return null;
  }

  function mapRemainingChildren(returnFiber, currentFirstChild) {
    // Add the remaining children to a temporary map so that we can find them by
    // keys quickly. Implicit (null) keys get added to this set with their index
    var existingChildren = new Map();

    var existingChild = currentFirstChild;
    while (existingChild !== null) {
      if (existingChild.key !== null) {
        existingChildren.set(existingChild.key, existingChild);
      } else {
        existingChildren.set(existingChild.index, existingChild);
      }
      existingChild = existingChild.sibling;
    }
    return existingChildren;
  }

  function useFiber(fiber, pendingProps, expirationTime) {
    // We currently set sibling to null and index to 0 here because it is easy
    // to forget to do before returning it. E.g. for the single child case.
    var clone = createWorkInProgress(fiber, pendingProps, expirationTime);
    clone.index = 0;
    clone.sibling = null;
    return clone;
  }

  function placeChild(newFiber, lastPlacedIndex, newIndex) {
    newFiber.index = newIndex;
    if (!shouldTrackSideEffects) {
      // Noop.
      return lastPlacedIndex;
    }
    var current$$1 = newFiber.alternate;
    if (current$$1 !== null) {
      var oldIndex = current$$1.index;
      if (oldIndex < lastPlacedIndex) {
        // This is a move.
        newFiber.effectTag = Placement;
        return lastPlacedIndex;
      } else {
        // This item can stay in place.
        return oldIndex;
      }
    } else {
      // This is an insertion.
      newFiber.effectTag = Placement;
      return lastPlacedIndex;
    }
  }

  function placeSingleChild(newFiber) {
    // This is simpler for the single child case. We only need to do a
    // placement for inserting new children.
    if (shouldTrackSideEffects && newFiber.alternate === null) {
      newFiber.effectTag = Placement;
    }
    return newFiber;
  }

  function updateTextNode(returnFiber, current$$1, textContent, expirationTime) {
    if (current$$1 === null || current$$1.tag !== HostText) {
      // Insert
      var created = createFiberFromText(textContent, returnFiber.mode, expirationTime);
      created.return = returnFiber;
      return created;
    } else {
      // Update
      var existing = useFiber(current$$1, textContent, expirationTime);
      existing.return = returnFiber;
      return existing;
    }
  }

  function updateElement(returnFiber, current$$1, element, expirationTime) {
    if (current$$1 !== null && current$$1.elementType === element.type) {
      // Move based on index
      var existing = useFiber(current$$1, element.props, expirationTime);
      existing.ref = coerceRef(returnFiber, current$$1, element);
      existing.return = returnFiber;
      return existing;
    } else {
      // Insert
      var created = createFiberFromElement(element, returnFiber.mode, expirationTime);
      created.ref = coerceRef(returnFiber, current$$1, element);
      created.return = returnFiber;
      return created;
    }
  }

  function updatePortal(returnFiber, current$$1, portal, expirationTime) {
    if (current$$1 === null || current$$1.tag !== HostPortal || current$$1.stateNode.containerInfo !== portal.containerInfo || current$$1.stateNode.implementation !== portal.implementation) {
      // Insert
      var created = createFiberFromPortal(portal, returnFiber.mode, expirationTime);
      created.return = returnFiber;
      return created;
    } else {
      // Update
      var existing = useFiber(current$$1, portal.children || [], expirationTime);
      existing.return = returnFiber;
      return existing;
    }
  }

  function updateFragment(returnFiber, current$$1, fragment, expirationTime, key) {
    if (current$$1 === null || current$$1.tag !== Fragment) {
      // Insert
      var created = createFiberFromFragment(fragment, returnFiber.mode, expirationTime, key);
      created.return = returnFiber;
      return created;
    } else {
      // Update
      var existing = useFiber(current$$1, fragment, expirationTime);
      existing.return = returnFiber;
      return existing;
    }
  }

  function createChild(returnFiber, newChild, expirationTime) {
    if (typeof newChild === 'string' || typeof newChild === 'number') {
      // Text nodes don't have keys. If the previous node is implicitly keyed
      // we can continue to replace it without aborting even if it is not a text
      // node.
      var created = createFiberFromText('' + newChild, returnFiber.mode, expirationTime);
      created.return = returnFiber;
      return created;
    }

    if (typeof newChild === 'object' && newChild !== null) {
      switch (newChild.$$typeof) {
        case REACT_ELEMENT_TYPE:
          {
            var _created = createFiberFromElement(newChild, returnFiber.mode, expirationTime);
            _created.ref = coerceRef(returnFiber, null, newChild);
            _created.return = returnFiber;
            return _created;
          }
        case REACT_PORTAL_TYPE:
          {
            var _created2 = createFiberFromPortal(newChild, returnFiber.mode, expirationTime);
            _created2.return = returnFiber;
            return _created2;
          }
      }

      if (isArray(newChild) || getIteratorFn(newChild)) {
        var _created3 = createFiberFromFragment(newChild, returnFiber.mode, expirationTime, null);
        _created3.return = returnFiber;
        return _created3;
      }

      throwOnInvalidObjectType(returnFiber, newChild);
    }

    return null;
  }

  function updateSlot(returnFiber, oldFiber, newChild, expirationTime) {
    // Update the fiber if the keys match, otherwise return null.

    var key = oldFiber !== null ? oldFiber.key : null;

    if (typeof newChild === 'string' || typeof newChild === 'number') {
      // Text nodes don't have keys. If the previous node is implicitly keyed
      // we can continue to replace it without aborting even if it is not a text
      // node.
      if (key !== null) {
        return null;
      }
      return updateTextNode(returnFiber, oldFiber, '' + newChild, expirationTime);
    }

    if (typeof newChild === 'object' && newChild !== null) {
      switch (newChild.$$typeof) {
        case REACT_ELEMENT_TYPE:
          {
            if (newChild.key === key) {
              if (newChild.type === REACT_FRAGMENT_TYPE) {
                return updateFragment(returnFiber, oldFiber, newChild.props.children, expirationTime, key);
              }
              return updateElement(returnFiber, oldFiber, newChild, expirationTime);
            } else {
              return null;
            }
          }
        case REACT_PORTAL_TYPE:
          {
            if (newChild.key === key) {
              return updatePortal(returnFiber, oldFiber, newChild, expirationTime);
            } else {
              return null;
            }
          }
      }

      if (isArray(newChild) || getIteratorFn(newChild)) {
        if (key !== null) {
          return null;
        }

        return updateFragment(returnFiber, oldFiber, newChild, expirationTime, null);
      }

      throwOnInvalidObjectType(returnFiber, newChild);
    }

    return null;
  }

  function updateFromMap(existingChildren, returnFiber, newIdx, newChild, expirationTime) {
    if (typeof newChild === 'string' || typeof newChild === 'number') {
      // Text nodes don't have keys, so we neither have to check the old nor
      // new node for the key. If both are text nodes, they match.
      var matchedFiber = existingChildren.get(newIdx) || null;
      return updateTextNode(returnFiber, matchedFiber, '' + newChild, expirationTime);
    }

    if (typeof newChild === 'object' && newChild !== null) {
      switch (newChild.$$typeof) {
        case REACT_ELEMENT_TYPE:
          {
            var _matchedFiber = existingChildren.get(newChild.key === null ? newIdx : newChild.key) || null;
            if (newChild.type === REACT_FRAGMENT_TYPE) {
              return updateFragment(returnFiber, _matchedFiber, newChild.props.children, expirationTime, newChild.key);
            }
            return updateElement(returnFiber, _matchedFiber, newChild, expirationTime);
          }
        case REACT_PORTAL_TYPE:
          {
            var _matchedFiber2 = existingChildren.get(newChild.key === null ? newIdx : newChild.key) || null;
            return updatePortal(returnFiber, _matchedFiber2, newChild, expirationTime);
          }
      }

      if (isArray(newChild) || getIteratorFn(newChild)) {
        var _matchedFiber3 = existingChildren.get(newIdx) || null;
        return updateFragment(returnFiber, _matchedFiber3, newChild, expirationTime, null);
      }

      throwOnInvalidObjectType(returnFiber, newChild);
    }

    return null;
  }

  /**
   * Warns if there is a duplicate or missing key
   */
  function reconcileChildrenArray(returnFiber, currentFirstChild, newChildren, expirationTime) {
    // This algorithm can't optimize by searching from both ends since we
    // don't have backpointers on fibers. I'm trying to see how far we can get
    // with that model. If it ends up not being worth the tradeoffs, we can
    // add it later.

    // Even with a two ended optimization, we'd want to optimize for the case
    // where there are few changes and brute force the comparison instead of
    // going for the Map. It'd like to explore hitting that path first in
    // forward-only mode and only go for the Map once we notice that we need
    // lots of look ahead. This doesn't handle reversal as well as two ended
    // search but that's unusual. Besides, for the two ended optimization to
    // work on Iterables, we'd need to copy the whole set.

    // In this first iteration, we'll just live with hitting the bad case
    // (adding everything to a Map) in for every insert/move.

    // If you change this code, also update reconcileChildrenIterator() which
    // uses the same algorithm.

    var resultingFirstChild = null;
    var previousNewFiber = null;

    var oldFiber = currentFirstChild;
    var lastPlacedIndex = 0;
    var newIdx = 0;
    var nextOldFiber = null;
    for (; oldFiber !== null && newIdx < newChildren.length; newIdx++) {
      if (oldFiber.index > newIdx) {
        nextOldFiber = oldFiber;
        oldFiber = null;
      } else {
        nextOldFiber = oldFiber.sibling;
      }
      var newFiber = updateSlot(returnFiber, oldFiber, newChildren[newIdx], expirationTime);
      if (newFiber === null) {
        // TODO: This breaks on empty slots like null children. That's
        // unfortunate because it triggers the slow path all the time. We need
        // a better way to communicate whether this was a miss or null,
        // boolean, undefined, etc.
        if (oldFiber === null) {
          oldFiber = nextOldFiber;
        }
        break;
      }
      if (shouldTrackSideEffects) {
        if (oldFiber && newFiber.alternate === null) {
          // We matched the slot, but we didn't reuse the existing fiber, so we
          // need to delete the existing child.
          deleteChild(returnFiber, oldFiber);
        }
      }
      lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);
      if (previousNewFiber === null) {
        // TODO: Move out of the loop. This only happens for the first run.
        resultingFirstChild = newFiber;
      } else {
        // TODO: Defer siblings if we're not at the right index for this slot.
        // I.e. if we had null values before, then we want to defer this
        // for each null value. However, we also don't want to call updateSlot
        // with the previous one.
        previousNewFiber.sibling = newFiber;
      }
      previousNewFiber = newFiber;
      oldFiber = nextOldFiber;
    }

    if (newIdx === newChildren.length) {
      // We've reached the end of the new children. We can delete the rest.
      deleteRemainingChildren(returnFiber, oldFiber);
      return resultingFirstChild;
    }

    if (oldFiber === null) {
      // If we don't have any more existing children we can choose a fast path
      // since the rest will all be insertions.
      for (; newIdx < newChildren.length; newIdx++) {
        var _newFiber = createChild(returnFiber, newChildren[newIdx], expirationTime);
        if (!_newFiber) {
          continue;
        }
        lastPlacedIndex = placeChild(_newFiber, lastPlacedIndex, newIdx);
        if (previousNewFiber === null) {
          // TODO: Move out of the loop. This only happens for the first run.
          resultingFirstChild = _newFiber;
        } else {
          previousNewFiber.sibling = _newFiber;
        }
        previousNewFiber = _newFiber;
      }
      return resultingFirstChild;
    }

    // Add all children to a key map for quick lookups.
    var existingChildren = mapRemainingChildren(returnFiber, oldFiber);

    // Keep scanning and use the map to restore deleted items as moves.
    for (; newIdx < newChildren.length; newIdx++) {
      var _newFiber2 = updateFromMap(existingChildren, returnFiber, newIdx, newChildren[newIdx], expirationTime);
      if (_newFiber2) {
        if (shouldTrackSideEffects) {
          if (_newFiber2.alternate !== null) {
            // The new fiber is a work in progress, but if there exists a
            // current, that means that we reused the fiber. We need to delete
            // it from the child list so that we don't add it to the deletion
            // list.
            existingChildren.delete(_newFiber2.key === null ? newIdx : _newFiber2.key);
          }
        }
        lastPlacedIndex = placeChild(_newFiber2, lastPlacedIndex, newIdx);
        if (previousNewFiber === null) {
          resultingFirstChild = _newFiber2;
        } else {
          previousNewFiber.sibling = _newFiber2;
        }
        previousNewFiber = _newFiber2;
      }
    }

    if (shouldTrackSideEffects) {
      // Any existing children that weren't consumed above were deleted. We need
      // to add them to the deletion list.
      existingChildren.forEach(function (child) {
        return deleteChild(returnFiber, child);
      });
    }

    return resultingFirstChild;
  }

  function reconcileChildrenIterator(returnFiber, currentFirstChild, newChildrenIterable, expirationTime) {
    // This is the same implementation as reconcileChildrenArray(),
    // but using the iterator instead.

    var iteratorFn = getIteratorFn(newChildrenIterable);
    !(typeof iteratorFn === 'function') ? reactProdInvariant('150') : void 0;

    var newChildren = iteratorFn.call(newChildrenIterable);
    !(newChildren != null) ? reactProdInvariant('151') : void 0;

    var resultingFirstChild = null;
    var previousNewFiber = null;

    var oldFiber = currentFirstChild;
    var lastPlacedIndex = 0;
    var newIdx = 0;
    var nextOldFiber = null;

    var step = newChildren.next();
    for (; oldFiber !== null && !step.done; newIdx++, step = newChildren.next()) {
      if (oldFiber.index > newIdx) {
        nextOldFiber = oldFiber;
        oldFiber = null;
      } else {
        nextOldFiber = oldFiber.sibling;
      }
      var newFiber = updateSlot(returnFiber, oldFiber, step.value, expirationTime);
      if (newFiber === null) {
        // TODO: This breaks on empty slots like null children. That's
        // unfortunate because it triggers the slow path all the time. We need
        // a better way to communicate whether this was a miss or null,
        // boolean, undefined, etc.
        if (!oldFiber) {
          oldFiber = nextOldFiber;
        }
        break;
      }
      if (shouldTrackSideEffects) {
        if (oldFiber && newFiber.alternate === null) {
          // We matched the slot, but we didn't reuse the existing fiber, so we
          // need to delete the existing child.
          deleteChild(returnFiber, oldFiber);
        }
      }
      lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);
      if (previousNewFiber === null) {
        // TODO: Move out of the loop. This only happens for the first run.
        resultingFirstChild = newFiber;
      } else {
        // TODO: Defer siblings if we're not at the right index for this slot.
        // I.e. if we had null values before, then we want to defer this
        // for each null value. However, we also don't want to call updateSlot
        // with the previous one.
        previousNewFiber.sibling = newFiber;
      }
      previousNewFiber = newFiber;
      oldFiber = nextOldFiber;
    }

    if (step.done) {
      // We've reached the end of the new children. We can delete the rest.
      deleteRemainingChildren(returnFiber, oldFiber);
      return resultingFirstChild;
    }

    if (oldFiber === null) {
      // If we don't have any more existing children we can choose a fast path
      // since the rest will all be insertions.
      for (; !step.done; newIdx++, step = newChildren.next()) {
        var _newFiber3 = createChild(returnFiber, step.value, expirationTime);
        if (_newFiber3 === null) {
          continue;
        }
        lastPlacedIndex = placeChild(_newFiber3, lastPlacedIndex, newIdx);
        if (previousNewFiber === null) {
          // TODO: Move out of the loop. This only happens for the first run.
          resultingFirstChild = _newFiber3;
        } else {
          previousNewFiber.sibling = _newFiber3;
        }
        previousNewFiber = _newFiber3;
      }
      return resultingFirstChild;
    }

    // Add all children to a key map for quick lookups.
    var existingChildren = mapRemainingChildren(returnFiber, oldFiber);

    // Keep scanning and use the map to restore deleted items as moves.
    for (; !step.done; newIdx++, step = newChildren.next()) {
      var _newFiber4 = updateFromMap(existingChildren, returnFiber, newIdx, step.value, expirationTime);
      if (_newFiber4 !== null) {
        if (shouldTrackSideEffects) {
          if (_newFiber4.alternate !== null) {
            // The new fiber is a work in progress, but if there exists a
            // current, that means that we reused the fiber. We need to delete
            // it from the child list so that we don't add it to the deletion
            // list.
            existingChildren.delete(_newFiber4.key === null ? newIdx : _newFiber4.key);
          }
        }
        lastPlacedIndex = placeChild(_newFiber4, lastPlacedIndex, newIdx);
        if (previousNewFiber === null) {
          resultingFirstChild = _newFiber4;
        } else {
          previousNewFiber.sibling = _newFiber4;
        }
        previousNewFiber = _newFiber4;
      }
    }

    if (shouldTrackSideEffects) {
      // Any existing children that weren't consumed above were deleted. We need
      // to add them to the deletion list.
      existingChildren.forEach(function (child) {
        return deleteChild(returnFiber, child);
      });
    }

    return resultingFirstChild;
  }

  function reconcileSingleTextNode(returnFiber, currentFirstChild, textContent, expirationTime) {
    // There's no need to check for keys on text nodes since we don't have a
    // way to define them.
    if (currentFirstChild !== null && currentFirstChild.tag === HostText) {
      // We already have an existing node so let's just update it and delete
      // the rest.
      deleteRemainingChildren(returnFiber, currentFirstChild.sibling);
      var existing = useFiber(currentFirstChild, textContent, expirationTime);
      existing.return = returnFiber;
      return existing;
    }
    // The existing first child is not a text node so we need to create one
    // and delete the existing ones.
    deleteRemainingChildren(returnFiber, currentFirstChild);
    var created = createFiberFromText(textContent, returnFiber.mode, expirationTime);
    created.return = returnFiber;
    return created;
  }

  function reconcileSingleElement(returnFiber, currentFirstChild, element, expirationTime) {
    var key = element.key;
    var child = currentFirstChild;
    while (child !== null) {
      // TODO: If key === null and child.key === null, then this only applies to
      // the first item in the list.
      if (child.key === key) {
        if (child.tag === Fragment ? element.type === REACT_FRAGMENT_TYPE : child.elementType === element.type) {
          deleteRemainingChildren(returnFiber, child.sibling);
          var existing = useFiber(child, element.type === REACT_FRAGMENT_TYPE ? element.props.children : element.props, expirationTime);
          existing.ref = coerceRef(returnFiber, child, element);
          existing.return = returnFiber;
          return existing;
        } else {
          deleteRemainingChildren(returnFiber, child);
          break;
        }
      } else {
        deleteChild(returnFiber, child);
      }
      child = child.sibling;
    }

    if (element.type === REACT_FRAGMENT_TYPE) {
      var created = createFiberFromFragment(element.props.children, returnFiber.mode, expirationTime, element.key);
      created.return = returnFiber;
      return created;
    } else {
      var _created4 = createFiberFromElement(element, returnFiber.mode, expirationTime);
      _created4.ref = coerceRef(returnFiber, currentFirstChild, element);
      _created4.return = returnFiber;
      return _created4;
    }
  }

  function reconcileSinglePortal(returnFiber, currentFirstChild, portal, expirationTime) {
    var key = portal.key;
    var child = currentFirstChild;
    while (child !== null) {
      // TODO: If key === null and child.key === null, then this only applies to
      // the first item in the list.
      if (child.key === key) {
        if (child.tag === HostPortal && child.stateNode.containerInfo === portal.containerInfo && child.stateNode.implementation === portal.implementation) {
          deleteRemainingChildren(returnFiber, child.sibling);
          var existing = useFiber(child, portal.children || [], expirationTime);
          existing.return = returnFiber;
          return existing;
        } else {
          deleteRemainingChildren(returnFiber, child);
          break;
        }
      } else {
        deleteChild(returnFiber, child);
      }
      child = child.sibling;
    }

    var created = createFiberFromPortal(portal, returnFiber.mode, expirationTime);
    created.return = returnFiber;
    return created;
  }

  // This API will tag the children with the side-effect of the reconciliation
  // itself. They will be added to the side-effect list as we pass through the
  // children and the parent.
  function reconcileChildFibers(returnFiber, currentFirstChild, newChild, expirationTime) {
    // This function is not recursive.
    // If the top level item is an array, we treat it as a set of children,
    // not as a fragment. Nested arrays on the other hand will be treated as
    // fragment nodes. Recursion happens at the normal flow.

    // Handle top level unkeyed fragments as if they were arrays.
    // This leads to an ambiguity between <>{[...]}</> and <>...</>.
    // We treat the ambiguous cases above the same.
    var isUnkeyedTopLevelFragment = typeof newChild === 'object' && newChild !== null && newChild.type === REACT_FRAGMENT_TYPE && newChild.key === null;
    if (isUnkeyedTopLevelFragment) {
      newChild = newChild.props.children;
    }

    // Handle object types
    var isObject = typeof newChild === 'object' && newChild !== null;

    if (isObject) {
      switch (newChild.$$typeof) {
        case REACT_ELEMENT_TYPE:
          return placeSingleChild(reconcileSingleElement(returnFiber, currentFirstChild, newChild, expirationTime));
        case REACT_PORTAL_TYPE:
          return placeSingleChild(reconcileSinglePortal(returnFiber, currentFirstChild, newChild, expirationTime));
      }
    }

    if (typeof newChild === 'string' || typeof newChild === 'number') {
      return placeSingleChild(reconcileSingleTextNode(returnFiber, currentFirstChild, '' + newChild, expirationTime));
    }

    if (isArray(newChild)) {
      return reconcileChildrenArray(returnFiber, currentFirstChild, newChild, expirationTime);
    }

    if (getIteratorFn(newChild)) {
      return reconcileChildrenIterator(returnFiber, currentFirstChild, newChild, expirationTime);
    }

    if (isObject) {
      throwOnInvalidObjectType(returnFiber, newChild);
    }

    if (typeof newChild === 'undefined' && !isUnkeyedTopLevelFragment) {
      // If the new child is undefined, and the return fiber is a composite
      // component, throw an error. If Fiber return types are disabled,
      // we already threw above.
      switch (returnFiber.tag) {
        case ClassComponent:
          {
            
          }
        // Intentionally fall through to the next case, which handles both
        // functions and classes
        // eslint-disable-next-lined no-fallthrough
        case FunctionComponent:
          {
            var Component = returnFiber.type;
            reactProdInvariant('152', Component.displayName || Component.name || 'Component');
          }
      }
    }

    // Remaining cases are all treated as empty.
    return deleteRemainingChildren(returnFiber, currentFirstChild);
  }

  return reconcileChildFibers;
}

var reconcileChildFibers = ChildReconciler(true);
var mountChildFibers = ChildReconciler(false);

function cloneChildFibers(current$$1, workInProgress) {
  !(current$$1 === null || workInProgress.child === current$$1.child) ? reactProdInvariant('153') : void 0;

  if (workInProgress.child === null) {
    return;
  }

  var currentChild = workInProgress.child;
  var newChild = createWorkInProgress(currentChild, currentChild.pendingProps, currentChild.expirationTime);
  workInProgress.child = newChild;

  newChild.return = workInProgress;
  while (currentChild.sibling !== null) {
    currentChild = currentChild.sibling;
    newChild = newChild.sibling = createWorkInProgress(currentChild, currentChild.pendingProps, currentChild.expirationTime);
    newChild.return = workInProgress;
  }
  newChild.sibling = null;
}

var NO_CONTEXT$1 = {};

var contextStackCursor$1 = createCursor(NO_CONTEXT$1);
var contextFiberStackCursor = createCursor(NO_CONTEXT$1);
var rootInstanceStackCursor = createCursor(NO_CONTEXT$1);

function requiredContext(c) {
  !(c !== NO_CONTEXT$1) ? reactProdInvariant('174') : void 0;
  return c;
}

function getRootHostContainer() {
  var rootInstance = requiredContext(rootInstanceStackCursor.current);
  return rootInstance;
}

function pushHostContainer(fiber, nextRootInstance) {
  // Push current root instance onto the stack;
  // This allows us to reset root when portals are popped.
  push(rootInstanceStackCursor, nextRootInstance, fiber);
  // Track the context and the Fiber that provided it.
  // This enables us to pop only Fibers that provide unique contexts.
  push(contextFiberStackCursor, fiber, fiber);

  // Finally, we need to push the host context to the stack.
  // However, we can't just call getRootHostContext() and push it because
  // we'd have a different number of entries on the stack depending on
  // whether getRootHostContext() throws somewhere in renderer code or not.
  // So we push an empty value first. This lets us safely unwind on errors.
  push(contextStackCursor$1, NO_CONTEXT$1, fiber);
  var nextRootContext = getRootHostContext(nextRootInstance);
  // Now that we know this function doesn't throw, replace it.
  pop(contextStackCursor$1, fiber);
  push(contextStackCursor$1, nextRootContext, fiber);
}

function popHostContainer(fiber) {
  pop(contextStackCursor$1, fiber);
  pop(contextFiberStackCursor, fiber);
  pop(rootInstanceStackCursor, fiber);
}

function getHostContext() {
  var context = requiredContext(contextStackCursor$1.current);
  return context;
}

function pushHostContext(fiber) {
  var rootInstance = requiredContext(rootInstanceStackCursor.current);
  var context = requiredContext(contextStackCursor$1.current);
  var nextContext = getChildHostContext(context, fiber.type, rootInstance);

  // Don't push this Fiber's context unless it's unique.
  if (context === nextContext) {
    return;
  }

  // Track the context and the Fiber that provided it.
  // This enables us to pop only Fibers that provide unique contexts.
  push(contextFiberStackCursor, fiber, fiber);
  push(contextStackCursor$1, nextContext, fiber);
}

function popHostContext(fiber) {
  // Do not pop unless this Fiber provided the current context.
  // pushHostContext() only pushes Fibers that provide unique contexts.
  if (contextFiberStackCursor.current !== fiber) {
    return;
  }

  pop(contextStackCursor$1, fiber);
  pop(contextFiberStackCursor, fiber);
}

var NoEffect$1 = /*             */0;
var UnmountSnapshot = /*      */2;
var UnmountMutation = /*      */4;
var MountMutation = /*        */8;
var UnmountLayout = /*        */16;
var MountLayout = /*          */32;
var MountPassive = /*         */64;
var UnmountPassive = /*       */128;

var ReactCurrentDispatcher$1 = ReactSharedInternals.ReactCurrentDispatcher;


// These are set right before calling the component.
var renderExpirationTime = NoWork;
// The work-in-progress fiber. I've named it differently to distinguish it from
// the work-in-progress hook.
var currentlyRenderingFiber$1 = null;

// Hooks are stored as a linked list on the fiber's memoizedState field. The
// current hook list is the list that belongs to the current fiber. The
// work-in-progress hook list is a new list that will be added to the
// work-in-progress fiber.
var currentHook = null;
var nextCurrentHook = null;
var firstWorkInProgressHook = null;
var workInProgressHook = null;
var nextWorkInProgressHook = null;

var remainingExpirationTime = NoWork;
var componentUpdateQueue = null;
var sideEffectTag = 0;

// Updates scheduled during render will trigger an immediate re-render at the
// end of the current pass. We can't store these updates on the normal queue,
// because if the work is aborted, they should be discarded. Because this is
// a relatively rare case, we also don't want to add an additional field to
// either the hook or queue object types. So we store them in a lazily create
// map of queue -> render-phase updates, which are discarded once the component
// completes without re-rendering.

// Whether an update was scheduled during the currently executing render pass.
var didScheduleRenderPhaseUpdate = false;
// Lazily created map of render-phase updates
var renderPhaseUpdates = null;
// Counter to prevent infinite loops.
var numberOfReRenders = 0;
var RE_RENDER_LIMIT = 25;

function throwInvalidHookError() {
  reactProdInvariant('321');
}

function areHookInputsEqual(nextDeps, prevDeps) {
  if (prevDeps === null) {
    return false;
  }

  for (var i = 0; i < prevDeps.length && i < nextDeps.length; i++) {
    if (is(nextDeps[i], prevDeps[i])) {
      continue;
    }
    return false;
  }
  return true;
}

function renderWithHooks(current, workInProgress, Component, props, refOrContext, nextRenderExpirationTime) {
  renderExpirationTime = nextRenderExpirationTime;
  currentlyRenderingFiber$1 = workInProgress;
  nextCurrentHook = current !== null ? current.memoizedState : null;

  {
    ReactCurrentDispatcher$1.current = nextCurrentHook === null ? HooksDispatcherOnMount : HooksDispatcherOnUpdate;
  }

  var children = Component(props, refOrContext);

  if (didScheduleRenderPhaseUpdate) {
    do {
      didScheduleRenderPhaseUpdate = false;
      numberOfReRenders += 1;

      // Start over from the beginning of the list
      nextCurrentHook = current !== null ? current.memoizedState : null;
      nextWorkInProgressHook = firstWorkInProgressHook;

      currentHook = null;
      workInProgressHook = null;
      componentUpdateQueue = null;

      ReactCurrentDispatcher$1.current = HooksDispatcherOnUpdate;

      children = Component(props, refOrContext);
    } while (didScheduleRenderPhaseUpdate);

    renderPhaseUpdates = null;
    numberOfReRenders = 0;
  }

  // We can assume the previous dispatcher is always this one, since we set it
  // at the beginning of the render phase and there's no re-entrancy.
  ReactCurrentDispatcher$1.current = ContextOnlyDispatcher;

  var renderedWork = currentlyRenderingFiber$1;

  renderedWork.memoizedState = firstWorkInProgressHook;
  renderedWork.expirationTime = remainingExpirationTime;
  renderedWork.updateQueue = componentUpdateQueue;
  renderedWork.effectTag |= sideEffectTag;

  var didRenderTooFewHooks = currentHook !== null && currentHook.next !== null;

  renderExpirationTime = NoWork;
  currentlyRenderingFiber$1 = null;

  currentHook = null;
  nextCurrentHook = null;
  firstWorkInProgressHook = null;
  workInProgressHook = null;
  nextWorkInProgressHook = null;

  remainingExpirationTime = NoWork;
  componentUpdateQueue = null;
  sideEffectTag = 0;

  // These were reset above
  // didScheduleRenderPhaseUpdate = false;
  // renderPhaseUpdates = null;
  // numberOfReRenders = 0;

  !!didRenderTooFewHooks ? reactProdInvariant('300') : void 0;

  return children;
}

function bailoutHooks(current, workInProgress, expirationTime) {
  workInProgress.updateQueue = current.updateQueue;
  workInProgress.effectTag &= ~(Passive | Update);
  if (current.expirationTime <= expirationTime) {
    current.expirationTime = NoWork;
  }
}

function resetHooks() {
  // We can assume the previous dispatcher is always this one, since we set it
  // at the beginning of the render phase and there's no re-entrancy.
  ReactCurrentDispatcher$1.current = ContextOnlyDispatcher;

  // This is used to reset the state of this module when a component throws.
  // It's also called inside mountIndeterminateComponent if we determine the
  // component is a module-style component.
  renderExpirationTime = NoWork;
  currentlyRenderingFiber$1 = null;

  currentHook = null;
  nextCurrentHook = null;
  firstWorkInProgressHook = null;
  workInProgressHook = null;
  nextWorkInProgressHook = null;

  remainingExpirationTime = NoWork;
  componentUpdateQueue = null;
  sideEffectTag = 0;

  didScheduleRenderPhaseUpdate = false;
  renderPhaseUpdates = null;
  numberOfReRenders = 0;
}

function mountWorkInProgressHook() {
  var hook = {
    memoizedState: null,

    baseState: null,
    queue: null,
    baseUpdate: null,

    next: null
  };

  if (workInProgressHook === null) {
    // This is the first hook in the list
    firstWorkInProgressHook = workInProgressHook = hook;
  } else {
    // Append to the end of the list
    workInProgressHook = workInProgressHook.next = hook;
  }
  return workInProgressHook;
}

function updateWorkInProgressHook() {
  // This function is used both for updates and for re-renders triggered by a
  // render phase update. It assumes there is either a current hook we can
  // clone, or a work-in-progress hook from a previous render pass that we can
  // use as a base. When we reach the end of the base list, we must switch to
  // the dispatcher used for mounts.
  if (nextWorkInProgressHook !== null) {
    // There's already a work-in-progress. Reuse it.
    workInProgressHook = nextWorkInProgressHook;
    nextWorkInProgressHook = workInProgressHook.next;

    currentHook = nextCurrentHook;
    nextCurrentHook = currentHook !== null ? currentHook.next : null;
  } else {
    // Clone from the current hook.
    !(nextCurrentHook !== null) ? reactProdInvariant('310') : void 0;
    currentHook = nextCurrentHook;

    var newHook = {
      memoizedState: currentHook.memoizedState,

      baseState: currentHook.baseState,
      queue: currentHook.queue,
      baseUpdate: currentHook.baseUpdate,

      next: null
    };

    if (workInProgressHook === null) {
      // This is the first hook in the list.
      workInProgressHook = firstWorkInProgressHook = newHook;
    } else {
      // Append to the end of the list.
      workInProgressHook = workInProgressHook.next = newHook;
    }
    nextCurrentHook = currentHook.next;
  }
  return workInProgressHook;
}

function createFunctionComponentUpdateQueue() {
  return {
    lastEffect: null
  };
}

function basicStateReducer(state, action) {
  return typeof action === 'function' ? action(state) : action;
}

function mountReducer(reducer, initialArg, init) {
  var hook = mountWorkInProgressHook();
  var initialState = void 0;
  if (init !== undefined) {
    initialState = init(initialArg);
  } else {
    initialState = initialArg;
  }
  hook.memoizedState = hook.baseState = initialState;
  var queue = hook.queue = {
    last: null,
    dispatch: null,
    lastRenderedReducer: reducer,
    lastRenderedState: initialState
  };
  var dispatch = queue.dispatch = dispatchAction.bind(null,
  // Flow doesn't know this is non-null, but we do.
  currentlyRenderingFiber$1, queue);
  return [hook.memoizedState, dispatch];
}

function updateReducer(reducer, initialArg, init) {
  var hook = updateWorkInProgressHook();
  var queue = hook.queue;
  !(queue !== null) ? reactProdInvariant('311') : void 0;

  queue.lastRenderedReducer = reducer;

  if (numberOfReRenders > 0) {
    // This is a re-render. Apply the new render phase updates to the previous
    var _dispatch = queue.dispatch;
    if (renderPhaseUpdates !== null) {
      // Render phase updates are stored in a map of queue -> linked list
      var firstRenderPhaseUpdate = renderPhaseUpdates.get(queue);
      if (firstRenderPhaseUpdate !== undefined) {
        renderPhaseUpdates.delete(queue);
        var newState = hook.memoizedState;
        var update = firstRenderPhaseUpdate;
        do {
          // Process this render phase update. We don't have to check the
          // priority because it will always be the same as the current
          // render's.
          var _action = update.action;
          newState = reducer(newState, _action);
          update = update.next;
        } while (update !== null);

        // Mark that the fiber performed work, but only if the new state is
        // different from the current state.
        if (!is(newState, hook.memoizedState)) {
          markWorkInProgressReceivedUpdate();
        }

        hook.memoizedState = newState;
        // Don't persist the state accumlated from the render phase updates to
        // the base state unless the queue is empty.
        // TODO: Not sure if this is the desired semantics, but it's what we
        // do for gDSFP. I can't remember why.
        if (hook.baseUpdate === queue.last) {
          hook.baseState = newState;
        }

        queue.lastRenderedState = newState;

        return [newState, _dispatch];
      }
    }
    return [hook.memoizedState, _dispatch];
  }

  // The last update in the entire queue
  var last = queue.last;
  // The last update that is part of the base state.
  var baseUpdate = hook.baseUpdate;
  var baseState = hook.baseState;

  // Find the first unprocessed update.
  var first = void 0;
  if (baseUpdate !== null) {
    if (last !== null) {
      // For the first update, the queue is a circular linked list where
      // `queue.last.next = queue.first`. Once the first update commits, and
      // the `baseUpdate` is no longer empty, we can unravel the list.
      last.next = null;
    }
    first = baseUpdate.next;
  } else {
    first = last !== null ? last.next : null;
  }
  if (first !== null) {
    var _newState = baseState;
    var newBaseState = null;
    var newBaseUpdate = null;
    var prevUpdate = baseUpdate;
    var _update = first;
    var didSkip = false;
    do {
      var updateExpirationTime = _update.expirationTime;
      if (updateExpirationTime < renderExpirationTime) {
        // Priority is insufficient. Skip this update. If this is the first
        // skipped update, the previous update/state is the new base
        // update/state.
        if (!didSkip) {
          didSkip = true;
          newBaseUpdate = prevUpdate;
          newBaseState = _newState;
        }
        // Update the remaining priority in the queue.
        if (updateExpirationTime > remainingExpirationTime) {
          remainingExpirationTime = updateExpirationTime;
        }
      } else {
        // Process this update.
        if (_update.eagerReducer === reducer) {
          // If this update was processed eagerly, and its reducer matches the
          // current reducer, we can use the eagerly computed state.
          _newState = _update.eagerState;
        } else {
          var _action2 = _update.action;
          _newState = reducer(_newState, _action2);
        }
      }
      prevUpdate = _update;
      _update = _update.next;
    } while (_update !== null && _update !== first);

    if (!didSkip) {
      newBaseUpdate = prevUpdate;
      newBaseState = _newState;
    }

    // Mark that the fiber performed work, but only if the new state is
    // different from the current state.
    if (!is(_newState, hook.memoizedState)) {
      markWorkInProgressReceivedUpdate();
    }

    hook.memoizedState = _newState;
    hook.baseUpdate = newBaseUpdate;
    hook.baseState = newBaseState;

    queue.lastRenderedState = _newState;
  }

  var dispatch = queue.dispatch;
  return [hook.memoizedState, dispatch];
}

function mountState(initialState) {
  var hook = mountWorkInProgressHook();
  if (typeof initialState === 'function') {
    initialState = initialState();
  }
  hook.memoizedState = hook.baseState = initialState;
  var queue = hook.queue = {
    last: null,
    dispatch: null,
    lastRenderedReducer: basicStateReducer,
    lastRenderedState: initialState
  };
  var dispatch = queue.dispatch = dispatchAction.bind(null,
  // Flow doesn't know this is non-null, but we do.
  currentlyRenderingFiber$1, queue);
  return [hook.memoizedState, dispatch];
}

function updateState(initialState) {
  return updateReducer(basicStateReducer, initialState);
}

function pushEffect(tag, create, destroy, deps) {
  var effect = {
    tag: tag,
    create: create,
    destroy: destroy,
    deps: deps,
    // Circular
    next: null
  };
  if (componentUpdateQueue === null) {
    componentUpdateQueue = createFunctionComponentUpdateQueue();
    componentUpdateQueue.lastEffect = effect.next = effect;
  } else {
    var _lastEffect = componentUpdateQueue.lastEffect;
    if (_lastEffect === null) {
      componentUpdateQueue.lastEffect = effect.next = effect;
    } else {
      var firstEffect = _lastEffect.next;
      _lastEffect.next = effect;
      effect.next = firstEffect;
      componentUpdateQueue.lastEffect = effect;
    }
  }
  return effect;
}

function mountRef(initialValue) {
  var hook = mountWorkInProgressHook();
  var ref = { current: initialValue };
  hook.memoizedState = ref;
  return ref;
}

function updateRef(initialValue) {
  var hook = updateWorkInProgressHook();
  return hook.memoizedState;
}

function mountEffectImpl(fiberEffectTag, hookEffectTag, create, deps) {
  var hook = mountWorkInProgressHook();
  var nextDeps = deps === undefined ? null : deps;
  sideEffectTag |= fiberEffectTag;
  hook.memoizedState = pushEffect(hookEffectTag, create, undefined, nextDeps);
}

function updateEffectImpl(fiberEffectTag, hookEffectTag, create, deps) {
  var hook = updateWorkInProgressHook();
  var nextDeps = deps === undefined ? null : deps;
  var destroy = undefined;

  if (currentHook !== null) {
    var prevEffect = currentHook.memoizedState;
    destroy = prevEffect.destroy;
    if (nextDeps !== null) {
      var prevDeps = prevEffect.deps;
      if (areHookInputsEqual(nextDeps, prevDeps)) {
        pushEffect(NoEffect$1, create, destroy, nextDeps);
        return;
      }
    }
  }

  sideEffectTag |= fiberEffectTag;
  hook.memoizedState = pushEffect(hookEffectTag, create, destroy, nextDeps);
}

function mountEffect(create, deps) {
  return mountEffectImpl(Update | Passive, UnmountPassive | MountPassive, create, deps);
}

function updateEffect(create, deps) {
  return updateEffectImpl(Update | Passive, UnmountPassive | MountPassive, create, deps);
}

function mountLayoutEffect(create, deps) {
  return mountEffectImpl(Update, UnmountMutation | MountLayout, create, deps);
}

function updateLayoutEffect(create, deps) {
  return updateEffectImpl(Update, UnmountMutation | MountLayout, create, deps);
}

function imperativeHandleEffect(create, ref) {
  if (typeof ref === 'function') {
    var refCallback = ref;
    var _inst = create();
    refCallback(_inst);
    return function () {
      refCallback(null);
    };
  } else if (ref !== null && ref !== undefined) {
    var refObject = ref;
    var _inst2 = create();
    refObject.current = _inst2;
    return function () {
      refObject.current = null;
    };
  }
}

function mountImperativeHandle(ref, create, deps) {
  var effectDeps = deps !== null && deps !== undefined ? deps.concat([ref]) : null;

  return mountEffectImpl(Update, UnmountMutation | MountLayout, imperativeHandleEffect.bind(null, create, ref), effectDeps);
}

function updateImperativeHandle(ref, create, deps) {
  var effectDeps = deps !== null && deps !== undefined ? deps.concat([ref]) : null;

  return updateEffectImpl(Update, UnmountMutation | MountLayout, imperativeHandleEffect.bind(null, create, ref), effectDeps);
}

function mountDebugValue(value, formatterFn) {
  // This hook is normally a no-op.
  // The react-debug-hooks package injects its own implementation
  // so that e.g. DevTools can display custom hook values.
}

var updateDebugValue = mountDebugValue;

function mountCallback(callback, deps) {
  var hook = mountWorkInProgressHook();
  var nextDeps = deps === undefined ? null : deps;
  hook.memoizedState = [callback, nextDeps];
  return callback;
}

function updateCallback(callback, deps) {
  var hook = updateWorkInProgressHook();
  var nextDeps = deps === undefined ? null : deps;
  var prevState = hook.memoizedState;
  if (prevState !== null) {
    if (nextDeps !== null) {
      var prevDeps = prevState[1];
      if (areHookInputsEqual(nextDeps, prevDeps)) {
        return prevState[0];
      }
    }
  }
  hook.memoizedState = [callback, nextDeps];
  return callback;
}

function mountMemo(nextCreate, deps) {
  var hook = mountWorkInProgressHook();
  var nextDeps = deps === undefined ? null : deps;
  var nextValue = nextCreate();
  hook.memoizedState = [nextValue, nextDeps];
  return nextValue;
}

function updateMemo(nextCreate, deps) {
  var hook = updateWorkInProgressHook();
  var nextDeps = deps === undefined ? null : deps;
  var prevState = hook.memoizedState;
  if (prevState !== null) {
    // Assume these are defined. If they're not, areHookInputsEqual will warn.
    if (nextDeps !== null) {
      var prevDeps = prevState[1];
      if (areHookInputsEqual(nextDeps, prevDeps)) {
        return prevState[0];
      }
    }
  }
  var nextValue = nextCreate();
  hook.memoizedState = [nextValue, nextDeps];
  return nextValue;
}

function dispatchAction(fiber, queue, action) {
  !(numberOfReRenders < RE_RENDER_LIMIT) ? reactProdInvariant('301') : void 0;

  var alternate = fiber.alternate;
  if (fiber === currentlyRenderingFiber$1 || alternate !== null && alternate === currentlyRenderingFiber$1) {
    // This is a render phase update. Stash it in a lazily-created map of
    // queue -> linked list of updates. After this render pass, we'll restart
    // and apply the stashed updates on top of the work-in-progress hook.
    didScheduleRenderPhaseUpdate = true;
    var update = {
      expirationTime: renderExpirationTime,
      action: action,
      eagerReducer: null,
      eagerState: null,
      next: null
    };
    if (renderPhaseUpdates === null) {
      renderPhaseUpdates = new Map();
    }
    var firstRenderPhaseUpdate = renderPhaseUpdates.get(queue);
    if (firstRenderPhaseUpdate === undefined) {
      renderPhaseUpdates.set(queue, update);
    } else {
      // Append the update to the end of the list.
      var lastRenderPhaseUpdate = firstRenderPhaseUpdate;
      while (lastRenderPhaseUpdate.next !== null) {
        lastRenderPhaseUpdate = lastRenderPhaseUpdate.next;
      }
      lastRenderPhaseUpdate.next = update;
    }
  } else {
    flushPassiveEffects$1();

    var currentTime = requestCurrentTime();
    var _expirationTime = computeExpirationForFiber(currentTime, fiber);

    var _update2 = {
      expirationTime: _expirationTime,
      action: action,
      eagerReducer: null,
      eagerState: null,
      next: null
    };

    // Append the update to the end of the list.
    var _last = queue.last;
    if (_last === null) {
      // This is the first update. Create a circular list.
      _update2.next = _update2;
    } else {
      var first = _last.next;
      if (first !== null) {
        // Still circular.
        _update2.next = first;
      }
      _last.next = _update2;
    }
    queue.last = _update2;

    if (fiber.expirationTime === NoWork && (alternate === null || alternate.expirationTime === NoWork)) {
      // The queue is currently empty, which means we can eagerly compute the
      // next state before entering the render phase. If the new state is the
      // same as the current state, we may be able to bail out entirely.
      var _lastRenderedReducer = queue.lastRenderedReducer;
      if (_lastRenderedReducer !== null) {
        try {
          var currentState = queue.lastRenderedState;
          var _eagerState = _lastRenderedReducer(currentState, action);
          // Stash the eagerly computed state, and the reducer used to compute
          // it, on the update object. If the reducer hasn't changed by the
          // time we enter the render phase, then the eager state can be used
          // without calling the reducer again.
          _update2.eagerReducer = _lastRenderedReducer;
          _update2.eagerState = _eagerState;
          if (is(_eagerState, currentState)) {
            // Fast path. We can bail out without scheduling React to re-render.
            // It's still possible that we'll need to rebase this update later,
            // if the component re-renders for a different reason and by that
            // time the reducer has changed.
            return;
          }
        } catch (error) {
          // Suppress the error. It will throw again in the render phase.
        } finally {
          
        }
      }
    }
    scheduleWork(fiber, _expirationTime);
  }
}

var ContextOnlyDispatcher = {
  readContext: readContext,

  useCallback: throwInvalidHookError,
  useContext: throwInvalidHookError,
  useEffect: throwInvalidHookError,
  useImperativeHandle: throwInvalidHookError,
  useLayoutEffect: throwInvalidHookError,
  useMemo: throwInvalidHookError,
  useReducer: throwInvalidHookError,
  useRef: throwInvalidHookError,
  useState: throwInvalidHookError,
  useDebugValue: throwInvalidHookError
};

var HooksDispatcherOnMount = {
  readContext: readContext,

  useCallback: mountCallback,
  useContext: readContext,
  useEffect: mountEffect,
  useImperativeHandle: mountImperativeHandle,
  useLayoutEffect: mountLayoutEffect,
  useMemo: mountMemo,
  useReducer: mountReducer,
  useRef: mountRef,
  useState: mountState,
  useDebugValue: mountDebugValue
};

var HooksDispatcherOnUpdate = {
  readContext: readContext,

  useCallback: updateCallback,
  useContext: readContext,
  useEffect: updateEffect,
  useImperativeHandle: updateImperativeHandle,
  useLayoutEffect: updateLayoutEffect,
  useMemo: updateMemo,
  useReducer: updateReducer,
  useRef: updateRef,
  useState: updateState,
  useDebugValue: updateDebugValue
};

var commitTime = 0;
var profilerStartTime = -1;

function getCommitTime() {
  return commitTime;
}

function recordCommitTime() {
  if (!enableProfilerTimer) {
    return;
  }
  commitTime = now();
}

function startProfilerTimer(fiber) {
  if (!enableProfilerTimer) {
    return;
  }

  profilerStartTime = now();

  if (fiber.actualStartTime < 0) {
    fiber.actualStartTime = now();
  }
}

function stopProfilerTimerIfRunning(fiber) {
  if (!enableProfilerTimer) {
    return;
  }
  profilerStartTime = -1;
}

function stopProfilerTimerIfRunningAndRecordDelta(fiber, overrideBaseTime) {
  if (!enableProfilerTimer) {
    return;
  }

  if (profilerStartTime >= 0) {
    var elapsedTime = now() - profilerStartTime;
    fiber.actualDuration += elapsedTime;
    if (overrideBaseTime) {
      fiber.selfBaseDuration = elapsedTime;
    }
    profilerStartTime = -1;
  }
}

// The deepest Fiber on the stack involved in a hydration context.
// This may have been an insertion or a hydration.
var hydrationParentFiber = null;
var nextHydratableInstance = null;
var isHydrating = false;

function enterHydrationState(fiber) {
  if (!supportsHydration) {
    return false;
  }

  var parentInstance = fiber.stateNode.containerInfo;
  nextHydratableInstance = getFirstHydratableChild(parentInstance);
  hydrationParentFiber = fiber;
  isHydrating = true;
  return true;
}

function reenterHydrationStateFromDehydratedSuspenseInstance(fiber) {
  if (!supportsHydration) {
    return false;
  }

  var suspenseInstance = fiber.stateNode;
  nextHydratableInstance = getNextHydratableSibling(suspenseInstance);
  popToNextHostParent(fiber);
  isHydrating = true;
  return true;
}

function deleteHydratableInstance(returnFiber, instance) {
  var childToDelete = createFiberFromHostInstanceForDeletion();
  childToDelete.stateNode = instance;
  childToDelete.return = returnFiber;
  childToDelete.effectTag = Deletion;

  // This might seem like it belongs on progressedFirstDeletion. However,
  // these children are not part of the reconciliation list of children.
  // Even if we abort and rereconcile the children, that will try to hydrate
  // again and the nodes are still in the host tree so these will be
  // recreated.
  if (returnFiber.lastEffect !== null) {
    returnFiber.lastEffect.nextEffect = childToDelete;
    returnFiber.lastEffect = childToDelete;
  } else {
    returnFiber.firstEffect = returnFiber.lastEffect = childToDelete;
  }
}

function insertNonHydratedInstance(returnFiber, fiber) {
  fiber.effectTag |= Placement;
  
}

function tryHydrate(fiber, nextInstance) {
  switch (fiber.tag) {
    case HostComponent:
      {
        var type = fiber.type;
        var props = fiber.pendingProps;
        var instance = canHydrateInstance(nextInstance, type, props);
        if (instance !== null) {
          fiber.stateNode = instance;
          return true;
        }
        return false;
      }
    case HostText:
      {
        var text = fiber.pendingProps;
        var textInstance = canHydrateTextInstance(nextInstance, text);
        if (textInstance !== null) {
          fiber.stateNode = textInstance;
          return true;
        }
        return false;
      }
    case SuspenseComponent:
      {
        if (enableSuspenseServerRenderer) {
          var suspenseInstance = canHydrateSuspenseInstance(nextInstance);
          if (suspenseInstance !== null) {
            // Downgrade the tag to a dehydrated component until we've hydrated it.
            fiber.tag = DehydratedSuspenseComponent;
            fiber.stateNode = suspenseInstance;
            return true;
          }
        }
        return false;
      }
    default:
      return false;
  }
}

function tryToClaimNextHydratableInstance(fiber) {
  if (!isHydrating) {
    return;
  }
  var nextInstance = nextHydratableInstance;
  if (!nextInstance) {
    // Nothing to hydrate. Make it an insertion.
    insertNonHydratedInstance(hydrationParentFiber, fiber);
    isHydrating = false;
    hydrationParentFiber = fiber;
    return;
  }
  var firstAttemptedInstance = nextInstance;
  if (!tryHydrate(fiber, nextInstance)) {
    // If we can't hydrate this instance let's try the next one.
    // We use this as a heuristic. It's based on intuition and not data so it
    // might be flawed or unnecessary.
    nextInstance = getNextHydratableSibling(firstAttemptedInstance);
    if (!nextInstance || !tryHydrate(fiber, nextInstance)) {
      // Nothing to hydrate. Make it an insertion.
      insertNonHydratedInstance(hydrationParentFiber, fiber);
      isHydrating = false;
      hydrationParentFiber = fiber;
      return;
    }
    // We matched the next one, we'll now assume that the first one was
    // superfluous and we'll delete it. Since we can't eagerly delete it
    // we'll have to schedule a deletion. To do that, this node needs a dummy
    // fiber associated with it.
    deleteHydratableInstance(hydrationParentFiber, firstAttemptedInstance);
  }
  hydrationParentFiber = fiber;
  nextHydratableInstance = getFirstHydratableChild(nextInstance);
}

function prepareToHydrateHostInstance(fiber, rootContainerInstance, hostContext) {
  if (!supportsHydration) {
    reactProdInvariant('175');
  }

  var instance = fiber.stateNode;
  var updatePayload = hydrateInstance(instance, fiber.type, fiber.memoizedProps, rootContainerInstance, hostContext, fiber);
  // TODO: Type this specific to this type of component.
  fiber.updateQueue = updatePayload;
  // If the update payload indicates that there is a change or if there
  // is a new ref we mark this as an update.
  if (updatePayload !== null) {
    return true;
  }
  return false;
}

function prepareToHydrateHostTextInstance(fiber) {
  if (!supportsHydration) {
    reactProdInvariant('176');
  }

  var textInstance = fiber.stateNode;
  var textContent = fiber.memoizedProps;
  var shouldUpdate = hydrateTextInstance(textInstance, textContent, fiber);
  return shouldUpdate;
}

function skipPastDehydratedSuspenseInstance(fiber) {
  if (!supportsHydration) {
    reactProdInvariant('316');
  }
  var suspenseInstance = fiber.stateNode;
  !suspenseInstance ? reactProdInvariant('317') : void 0;
  nextHydratableInstance = getNextHydratableInstanceAfterSuspenseInstance(suspenseInstance);
}

function popToNextHostParent(fiber) {
  var parent = fiber.return;
  while (parent !== null && parent.tag !== HostComponent && parent.tag !== HostRoot && parent.tag !== DehydratedSuspenseComponent) {
    parent = parent.return;
  }
  hydrationParentFiber = parent;
}

function popHydrationState(fiber) {
  if (!supportsHydration) {
    return false;
  }
  if (fiber !== hydrationParentFiber) {
    // We're deeper than the current hydration context, inside an inserted
    // tree.
    return false;
  }
  if (!isHydrating) {
    // If we're not currently hydrating but we're in a hydration context, then
    // we were an insertion and now need to pop up reenter hydration of our
    // siblings.
    popToNextHostParent(fiber);
    isHydrating = true;
    return false;
  }

  var type = fiber.type;

  // If we have any remaining hydratable nodes, we need to delete them now.
  // We only do this deeper than head and body since they tend to have random
  // other nodes in them. We also ignore components with pure text content in
  // side of them.
  // TODO: Better heuristic.
  if (fiber.tag !== HostComponent || type !== 'head' && type !== 'body' && !shouldSetTextContent(type, fiber.memoizedProps)) {
    var nextInstance = nextHydratableInstance;
    while (nextInstance) {
      deleteHydratableInstance(fiber, nextInstance);
      nextInstance = getNextHydratableSibling(nextInstance);
    }
  }

  popToNextHostParent(fiber);
  nextHydratableInstance = hydrationParentFiber ? getNextHydratableSibling(fiber.stateNode) : null;
  return true;
}

function resetHydrationState() {
  if (!supportsHydration) {
    return;
  }

  hydrationParentFiber = null;
  nextHydratableInstance = null;
  isHydrating = false;
}

var ReactCurrentOwner$2 = ReactSharedInternals.ReactCurrentOwner;

var didReceiveUpdate = false;



function reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime) {
  if (current$$1 === null) {
    // If this is a fresh new component that hasn't been rendered yet, we
    // won't update its child set by applying minimal side-effects. Instead,
    // we will add them all to the child before it gets rendered. That means
    // we can optimize this reconciliation pass by not tracking side-effects.
    workInProgress.child = mountChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
  } else {
    // If the current child is the same as the work in progress, it means that
    // we haven't yet started any work on these children. Therefore, we use
    // the clone algorithm to create a copy of all the current children.

    // If we had any progressed work already, that is invalid at this point so
    // let's throw it out.
    workInProgress.child = reconcileChildFibers(workInProgress, current$$1.child, nextChildren, renderExpirationTime);
  }
}

function forceUnmountCurrentAndReconcile(current$$1, workInProgress, nextChildren, renderExpirationTime) {
  // This function is fork of reconcileChildren. It's used in cases where we
  // want to reconcile without matching against the existing set. This has the
  // effect of all current children being unmounted; even if the type and key
  // are the same, the old child is unmounted and a new child is created.
  //
  // To do this, we're going to go through the reconcile algorithm twice. In
  // the first pass, we schedule a deletion for all the current children by
  // passing null.
  workInProgress.child = reconcileChildFibers(workInProgress, current$$1.child, null, renderExpirationTime);
  // In the second pass, we mount the new children. The trick here is that we
  // pass null in place of where we usually pass the current child set. This has
  // the effect of remounting all children regardless of whether their their
  // identity matches.
  workInProgress.child = reconcileChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
}

function updateForwardRef(current$$1, workInProgress, Component, nextProps, renderExpirationTime) {
  // TODO: current can be non-null here even if the component
  // hasn't yet mounted. This happens after the first render suspends.
  // We'll need to figure out if this is fine or can cause issues.

  var render = Component.render;
  var ref = workInProgress.ref;

  // The rest is a fork of updateFunctionComponent
  var nextChildren = void 0;
  prepareToReadContext(workInProgress, renderExpirationTime);
  {
    nextChildren = renderWithHooks(current$$1, workInProgress, render, nextProps, ref, renderExpirationTime);
  }

  if (current$$1 !== null && !didReceiveUpdate) {
    bailoutHooks(current$$1, workInProgress, renderExpirationTime);
    return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
  }

  // React DevTools reads this flag.
  workInProgress.effectTag |= PerformedWork;
  reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  return workInProgress.child;
}

function updateMemoComponent(current$$1, workInProgress, Component, nextProps, updateExpirationTime, renderExpirationTime) {
  if (current$$1 === null) {
    var type = Component.type;
    if (isSimpleFunctionComponent(type) && Component.compare === null &&
    // SimpleMemoComponent codepath doesn't resolve outer props either.
    Component.defaultProps === undefined) {
      // If this is a plain function component without default props,
      // and with only the default shallow comparison, we upgrade it
      // to a SimpleMemoComponent to allow fast path updates.
      workInProgress.tag = SimpleMemoComponent;
      workInProgress.type = type;
      return updateSimpleMemoComponent(current$$1, workInProgress, type, nextProps, updateExpirationTime, renderExpirationTime);
    }
    var child = createFiberFromTypeAndProps(Component.type, null, nextProps, null, workInProgress.mode, renderExpirationTime);
    child.ref = workInProgress.ref;
    child.return = workInProgress;
    workInProgress.child = child;
    return child;
  }
  var currentChild = current$$1.child; // This is always exactly one child
  if (updateExpirationTime < renderExpirationTime) {
    // This will be the props with resolved defaultProps,
    // unlike current.memoizedProps which will be the unresolved ones.
    var prevProps = currentChild.memoizedProps;
    // Default to shallow comparison
    var compare = Component.compare;
    compare = compare !== null ? compare : shallowEqual;
    if (compare(prevProps, nextProps) && current$$1.ref === workInProgress.ref) {
      return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
    }
  }
  // React DevTools reads this flag.
  workInProgress.effectTag |= PerformedWork;
  var newChild = createWorkInProgress(currentChild, nextProps, renderExpirationTime);
  newChild.ref = workInProgress.ref;
  newChild.return = workInProgress;
  workInProgress.child = newChild;
  return newChild;
}

function updateSimpleMemoComponent(current$$1, workInProgress, Component, nextProps, updateExpirationTime, renderExpirationTime) {
  // TODO: current can be non-null here even if the component
  // hasn't yet mounted. This happens when the inner render suspends.
  // We'll need to figure out if this is fine or can cause issues.

  if (current$$1 !== null) {
    var prevProps = current$$1.memoizedProps;
    if (shallowEqual(prevProps, nextProps) && current$$1.ref === workInProgress.ref) {
      didReceiveUpdate = false;
      if (updateExpirationTime < renderExpirationTime) {
        return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
      }
    }
  }
  return updateFunctionComponent(current$$1, workInProgress, Component, nextProps, renderExpirationTime);
}

function updateFragment(current$$1, workInProgress, renderExpirationTime) {
  var nextChildren = workInProgress.pendingProps;
  reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  return workInProgress.child;
}

function updateMode(current$$1, workInProgress, renderExpirationTime) {
  var nextChildren = workInProgress.pendingProps.children;
  reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  return workInProgress.child;
}

function updateProfiler(current$$1, workInProgress, renderExpirationTime) {
  if (enableProfilerTimer) {
    workInProgress.effectTag |= Update;
  }
  var nextProps = workInProgress.pendingProps;
  var nextChildren = nextProps.children;
  reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  return workInProgress.child;
}

function markRef(current$$1, workInProgress) {
  var ref = workInProgress.ref;
  if (current$$1 === null && ref !== null || current$$1 !== null && current$$1.ref !== ref) {
    // Schedule a Ref effect
    workInProgress.effectTag |= Ref;
  }
}

function updateFunctionComponent(current$$1, workInProgress, Component, nextProps, renderExpirationTime) {
  var unmaskedContext = getUnmaskedContext(workInProgress, Component, true);
  var context = getMaskedContext(workInProgress, unmaskedContext);

  var nextChildren = void 0;
  prepareToReadContext(workInProgress, renderExpirationTime);
  {
    nextChildren = renderWithHooks(current$$1, workInProgress, Component, nextProps, context, renderExpirationTime);
  }

  if (current$$1 !== null && !didReceiveUpdate) {
    bailoutHooks(current$$1, workInProgress, renderExpirationTime);
    return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
  }

  // React DevTools reads this flag.
  workInProgress.effectTag |= PerformedWork;
  reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  return workInProgress.child;
}

function updateClassComponent(current$$1, workInProgress, Component, nextProps, renderExpirationTime) {
  var hasContext = void 0;
  if (isContextProvider(Component)) {
    hasContext = true;
    pushContextProvider(workInProgress);
  } else {
    hasContext = false;
  }
  prepareToReadContext(workInProgress, renderExpirationTime);

  var instance = workInProgress.stateNode;
  var shouldUpdate = void 0;
  if (instance === null) {
    if (current$$1 !== null) {
      // An class component without an instance only mounts if it suspended
      // inside a non- concurrent tree, in an inconsistent state. We want to
      // tree it like a new mount, even though an empty version of it already
      // committed. Disconnect the alternate pointers.
      current$$1.alternate = null;
      workInProgress.alternate = null;
      // Since this is conceptually a new fiber, schedule a Placement effect
      workInProgress.effectTag |= Placement;
    }
    // In the initial pass we might need to construct the instance.
    constructClassInstance(workInProgress, Component, nextProps, renderExpirationTime);
    mountClassInstance(workInProgress, Component, nextProps, renderExpirationTime);
    shouldUpdate = true;
  } else if (current$$1 === null) {
    // In a resume, we'll already have an instance we can reuse.
    shouldUpdate = resumeMountClassInstance(workInProgress, Component, nextProps, renderExpirationTime);
  } else {
    shouldUpdate = updateClassInstance(current$$1, workInProgress, Component, nextProps, renderExpirationTime);
  }
  var nextUnitOfWork = finishClassComponent(current$$1, workInProgress, Component, shouldUpdate, hasContext, renderExpirationTime);
  return nextUnitOfWork;
}

function finishClassComponent(current$$1, workInProgress, Component, shouldUpdate, hasContext, renderExpirationTime) {
  // Refs should update even if shouldComponentUpdate returns false
  markRef(current$$1, workInProgress);

  var didCaptureError = (workInProgress.effectTag & DidCapture) !== NoEffect;

  if (!shouldUpdate && !didCaptureError) {
    // Context providers should defer to sCU for rendering
    if (hasContext) {
      invalidateContextProvider(workInProgress, Component, false);
    }

    return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
  }

  var instance = workInProgress.stateNode;

  // Rerender
  ReactCurrentOwner$2.current = workInProgress;
  var nextChildren = void 0;
  if (didCaptureError && typeof Component.getDerivedStateFromError !== 'function') {
    // If we captured an error, but getDerivedStateFrom catch is not defined,
    // unmount all the children. componentDidCatch will schedule an update to
    // re-render a fallback. This is temporary until we migrate everyone to
    // the new API.
    // TODO: Warn in a future release.
    nextChildren = null;

    if (enableProfilerTimer) {
      stopProfilerTimerIfRunning(workInProgress);
    }
  } else {
    {
      nextChildren = instance.render();
    }
  }

  // React DevTools reads this flag.
  workInProgress.effectTag |= PerformedWork;
  if (current$$1 !== null && didCaptureError) {
    // If we're recovering from an error, reconcile without reusing any of
    // the existing children. Conceptually, the normal children and the children
    // that are shown on error are two different sets, so we shouldn't reuse
    // normal children even if their identities match.
    forceUnmountCurrentAndReconcile(current$$1, workInProgress, nextChildren, renderExpirationTime);
  } else {
    reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  }

  // Memoize state using the values we just used to render.
  // TODO: Restructure so we never read values from the instance.
  workInProgress.memoizedState = instance.state;

  // The context might have changed so we need to recalculate it.
  if (hasContext) {
    invalidateContextProvider(workInProgress, Component, true);
  }

  return workInProgress.child;
}

function pushHostRootContext(workInProgress) {
  var root = workInProgress.stateNode;
  if (root.pendingContext) {
    pushTopLevelContextObject(workInProgress, root.pendingContext, root.pendingContext !== root.context);
  } else if (root.context) {
    // Should always be set
    pushTopLevelContextObject(workInProgress, root.context, false);
  }
  pushHostContainer(workInProgress, root.containerInfo);
}

function updateHostRoot(current$$1, workInProgress, renderExpirationTime) {
  pushHostRootContext(workInProgress);
  var updateQueue = workInProgress.updateQueue;
  !(updateQueue !== null) ? reactProdInvariant('282') : void 0;
  var nextProps = workInProgress.pendingProps;
  var prevState = workInProgress.memoizedState;
  var prevChildren = prevState !== null ? prevState.element : null;
  processUpdateQueue(workInProgress, updateQueue, nextProps, null, renderExpirationTime);
  var nextState = workInProgress.memoizedState;
  // Caution: React DevTools currently depends on this property
  // being called "element".
  var nextChildren = nextState.element;
  if (nextChildren === prevChildren) {
    // If the state is the same as before, that's a bailout because we had
    // no work that expires at this time.
    resetHydrationState();
    return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
  }
  var root = workInProgress.stateNode;
  if ((current$$1 === null || current$$1.child === null) && root.hydrate && enterHydrationState(workInProgress)) {
    // If we don't have any current children this might be the first pass.
    // We always try to hydrate. If this isn't a hydration pass there won't
    // be any children to hydrate which is effectively the same thing as
    // not hydrating.

    // This is a bit of a hack. We track the host root as a placement to
    // know that we're currently in a mounting state. That way isMounted
    // works as expected. We must reset this before committing.
    // TODO: Delete this when we delete isMounted and findDOMNode.
    workInProgress.effectTag |= Placement;

    // Ensure that children mount into this root without tracking
    // side-effects. This ensures that we don't store Placement effects on
    // nodes that will be hydrated.
    workInProgress.child = mountChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
  } else {
    // Otherwise reset hydration state in case we aborted and resumed another
    // root.
    reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
    resetHydrationState();
  }
  return workInProgress.child;
}

function updateHostComponent(current$$1, workInProgress, renderExpirationTime) {
  pushHostContext(workInProgress);

  if (current$$1 === null) {
    tryToClaimNextHydratableInstance(workInProgress);
  }

  var type = workInProgress.type;
  var nextProps = workInProgress.pendingProps;
  var prevProps = current$$1 !== null ? current$$1.memoizedProps : null;

  var nextChildren = nextProps.children;
  var isDirectTextChild = shouldSetTextContent(type, nextProps);

  if (isDirectTextChild) {
    // We special case a direct text child of a host node. This is a common
    // case. We won't handle it as a reified child. We will instead handle
    // this in the host environment that also have access to this prop. That
    // avoids allocating another HostText fiber and traversing it.
    nextChildren = null;
  } else if (prevProps !== null && shouldSetTextContent(type, prevProps)) {
    // If we're switching from a direct text child to a normal child, or to
    // empty, we need to schedule the text content to be reset.
    workInProgress.effectTag |= ContentReset;
  }

  markRef(current$$1, workInProgress);

  // Check the host config to see if the children are offscreen/hidden.
  if (renderExpirationTime !== Never && workInProgress.mode & ConcurrentMode && shouldDeprioritizeSubtree(type, nextProps)) {
    // Schedule this fiber to re-render at offscreen priority. Then bailout.
    workInProgress.expirationTime = workInProgress.childExpirationTime = Never;
    return null;
  }

  reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  return workInProgress.child;
}

function updateHostText(current$$1, workInProgress) {
  if (current$$1 === null) {
    tryToClaimNextHydratableInstance(workInProgress);
  }
  // Nothing to do here. This is terminal. We'll do the completion step
  // immediately after.
  return null;
}

function mountLazyComponent(_current, workInProgress, elementType, updateExpirationTime, renderExpirationTime) {
  if (_current !== null) {
    // An lazy component only mounts if it suspended inside a non-
    // concurrent tree, in an inconsistent state. We want to treat it like
    // a new mount, even though an empty version of it already committed.
    // Disconnect the alternate pointers.
    _current.alternate = null;
    workInProgress.alternate = null;
    // Since this is conceptually a new fiber, schedule a Placement effect
    workInProgress.effectTag |= Placement;
  }

  var props = workInProgress.pendingProps;
  // We can't start a User Timing measurement with correct label yet.
  // Cancel and resume right after we know the tag.
  cancelWorkTimer(workInProgress);
  var Component = readLazyComponentType(elementType);
  // Store the unwrapped component in the type.
  workInProgress.type = Component;
  var resolvedTag = workInProgress.tag = resolveLazyComponentTag(Component);
  startWorkTimer(workInProgress);
  var resolvedProps = resolveDefaultProps(Component, props);
  var child = void 0;
  switch (resolvedTag) {
    case FunctionComponent:
      {
        child = updateFunctionComponent(null, workInProgress, Component, resolvedProps, renderExpirationTime);
        break;
      }
    case ClassComponent:
      {
        child = updateClassComponent(null, workInProgress, Component, resolvedProps, renderExpirationTime);
        break;
      }
    case ForwardRef:
      {
        child = updateForwardRef(null, workInProgress, Component, resolvedProps, renderExpirationTime);
        break;
      }
    case MemoComponent:
      {
        child = updateMemoComponent(null, workInProgress, Component, resolveDefaultProps(Component.type, resolvedProps), // The inner type can have defaults too
        updateExpirationTime, renderExpirationTime);
        break;
      }
    default:
      {
        var hint = '';
        reactProdInvariant('306', Component, hint);
      }
  }
  return child;
}

function mountIncompleteClassComponent(_current, workInProgress, Component, nextProps, renderExpirationTime) {
  if (_current !== null) {
    // An incomplete component only mounts if it suspended inside a non-
    // concurrent tree, in an inconsistent state. We want to treat it like
    // a new mount, even though an empty version of it already committed.
    // Disconnect the alternate pointers.
    _current.alternate = null;
    workInProgress.alternate = null;
    // Since this is conceptually a new fiber, schedule a Placement effect
    workInProgress.effectTag |= Placement;
  }

  // Promote the fiber to a class and try rendering again.
  workInProgress.tag = ClassComponent;

  // The rest of this function is a fork of `updateClassComponent`

  // Push context providers early to prevent context stack mismatches.
  // During mounting we don't know the child context yet as the instance doesn't exist.
  // We will invalidate the child context in finishClassComponent() right after rendering.
  var hasContext = void 0;
  if (isContextProvider(Component)) {
    hasContext = true;
    pushContextProvider(workInProgress);
  } else {
    hasContext = false;
  }
  prepareToReadContext(workInProgress, renderExpirationTime);

  constructClassInstance(workInProgress, Component, nextProps, renderExpirationTime);
  mountClassInstance(workInProgress, Component, nextProps, renderExpirationTime);

  return finishClassComponent(null, workInProgress, Component, true, hasContext, renderExpirationTime);
}

function mountIndeterminateComponent(_current, workInProgress, Component, renderExpirationTime) {
  if (_current !== null) {
    // An indeterminate component only mounts if it suspended inside a non-
    // concurrent tree, in an inconsistent state. We want to treat it like
    // a new mount, even though an empty version of it already committed.
    // Disconnect the alternate pointers.
    _current.alternate = null;
    workInProgress.alternate = null;
    // Since this is conceptually a new fiber, schedule a Placement effect
    workInProgress.effectTag |= Placement;
  }

  var props = workInProgress.pendingProps;
  var unmaskedContext = getUnmaskedContext(workInProgress, Component, false);
  var context = getMaskedContext(workInProgress, unmaskedContext);

  prepareToReadContext(workInProgress, renderExpirationTime);

  var value = void 0;

  {
    value = renderWithHooks(null, workInProgress, Component, props, context, renderExpirationTime);
  }
  // React DevTools reads this flag.
  workInProgress.effectTag |= PerformedWork;

  if (typeof value === 'object' && value !== null && typeof value.render === 'function' && value.$$typeof === undefined) {
    // Proceed under the assumption that this is a class instance
    workInProgress.tag = ClassComponent;

    // Throw out any hooks that were used.
    resetHooks();

    // Push context providers early to prevent context stack mismatches.
    // During mounting we don't know the child context yet as the instance doesn't exist.
    // We will invalidate the child context in finishClassComponent() right after rendering.
    var hasContext = false;
    if (isContextProvider(Component)) {
      hasContext = true;
      pushContextProvider(workInProgress);
    } else {
      hasContext = false;
    }

    workInProgress.memoizedState = value.state !== null && value.state !== undefined ? value.state : null;

    var getDerivedStateFromProps = Component.getDerivedStateFromProps;
    if (typeof getDerivedStateFromProps === 'function') {
      applyDerivedStateFromProps(workInProgress, Component, getDerivedStateFromProps, props);
    }

    adoptClassInstance(workInProgress, value);
    mountClassInstance(workInProgress, Component, props, renderExpirationTime);
    return finishClassComponent(null, workInProgress, Component, true, hasContext, renderExpirationTime);
  } else {
    // Proceed under the assumption that this is a function component
    workInProgress.tag = FunctionComponent;
    reconcileChildren(null, workInProgress, value, renderExpirationTime);
    return workInProgress.child;
  }
}

function updateSuspenseComponent(current$$1, workInProgress, renderExpirationTime) {
  var mode = workInProgress.mode;
  var nextProps = workInProgress.pendingProps;

  // We should attempt to render the primary children unless this boundary
  // already suspended during this render (`alreadyCaptured` is true).
  var nextState = workInProgress.memoizedState;

  var nextDidTimeout = void 0;
  if ((workInProgress.effectTag & DidCapture) === NoEffect) {
    // This is the first attempt.
    nextState = null;
    nextDidTimeout = false;
  } else {
    // Something in this boundary's subtree already suspended. Switch to
    // rendering the fallback children.
    nextState = {
      timedOutAt: nextState !== null ? nextState.timedOutAt : NoWork
    };
    nextDidTimeout = true;
    workInProgress.effectTag &= ~DidCapture;
  }

  // This next part is a bit confusing. If the children timeout, we switch to
  // showing the fallback children in place of the "primary" children.
  // However, we don't want to delete the primary children because then their
  // state will be lost (both the React state and the host state, e.g.
  // uncontrolled form inputs). Instead we keep them mounted and hide them.
  // Both the fallback children AND the primary children are rendered at the
  // same time. Once the primary children are un-suspended, we can delete
  // the fallback children — don't need to preserve their state.
  //
  // The two sets of children are siblings in the host environment, but
  // semantically, for purposes of reconciliation, they are two separate sets.
  // So we store them using two fragment fibers.
  //
  // However, we want to avoid allocating extra fibers for every placeholder.
  // They're only necessary when the children time out, because that's the
  // only time when both sets are mounted.
  //
  // So, the extra fragment fibers are only used if the children time out.
  // Otherwise, we render the primary children directly. This requires some
  // custom reconciliation logic to preserve the state of the primary
  // children. It's essentially a very basic form of re-parenting.

  // `child` points to the child fiber. In the normal case, this is the first
  // fiber of the primary children set. In the timed-out case, it's a
  // a fragment fiber containing the primary children.
  var child = void 0;
  // `next` points to the next fiber React should render. In the normal case,
  // it's the same as `child`: the first fiber of the primary children set.
  // In the timed-out case, it's a fragment fiber containing the *fallback*
  // children -- we skip over the primary children entirely.
  var next = void 0;
  if (current$$1 === null) {
    if (enableSuspenseServerRenderer) {
      // If we're currently hydrating, try to hydrate this boundary.
      // But only if this has a fallback.
      if (nextProps.fallback !== undefined) {
        tryToClaimNextHydratableInstance(workInProgress);
        // This could've changed the tag if this was a dehydrated suspense component.
        if (workInProgress.tag === DehydratedSuspenseComponent) {
          return updateDehydratedSuspenseComponent(null, workInProgress, renderExpirationTime);
        }
      }
    }

    // This is the initial mount. This branch is pretty simple because there's
    // no previous state that needs to be preserved.
    if (nextDidTimeout) {
      // Mount separate fragments for primary and fallback children.
      var nextFallbackChildren = nextProps.fallback;
      var primaryChildFragment = createFiberFromFragment(null, mode, NoWork, null);

      if ((workInProgress.mode & ConcurrentMode) === NoContext) {
        // Outside of concurrent mode, we commit the effects from the
        var progressedState = workInProgress.memoizedState;
        var progressedPrimaryChild = progressedState !== null ? workInProgress.child.child : workInProgress.child;
        primaryChildFragment.child = progressedPrimaryChild;
      }

      var fallbackChildFragment = createFiberFromFragment(nextFallbackChildren, mode, renderExpirationTime, null);
      primaryChildFragment.sibling = fallbackChildFragment;
      child = primaryChildFragment;
      // Skip the primary children, and continue working on the
      // fallback children.
      next = fallbackChildFragment;
      child.return = next.return = workInProgress;
    } else {
      // Mount the primary children without an intermediate fragment fiber.
      var nextPrimaryChildren = nextProps.children;
      child = next = mountChildFibers(workInProgress, null, nextPrimaryChildren, renderExpirationTime);
    }
  } else {
    // This is an update. This branch is more complicated because we need to
    // ensure the state of the primary children is preserved.
    var prevState = current$$1.memoizedState;
    var prevDidTimeout = prevState !== null;
    if (prevDidTimeout) {
      // The current tree already timed out. That means each child set is
      var currentPrimaryChildFragment = current$$1.child;
      var currentFallbackChildFragment = currentPrimaryChildFragment.sibling;
      if (nextDidTimeout) {
        // Still timed out. Reuse the current primary children by cloning
        // its fragment. We're going to skip over these entirely.
        var _nextFallbackChildren = nextProps.fallback;
        var _primaryChildFragment = createWorkInProgress(currentPrimaryChildFragment, currentPrimaryChildFragment.pendingProps, NoWork);

        if ((workInProgress.mode & ConcurrentMode) === NoContext) {
          // Outside of concurrent mode, we commit the effects from the
          var _progressedState = workInProgress.memoizedState;
          var _progressedPrimaryChild = _progressedState !== null ? workInProgress.child.child : workInProgress.child;
          if (_progressedPrimaryChild !== currentPrimaryChildFragment.child) {
            _primaryChildFragment.child = _progressedPrimaryChild;
          }
        }

        // Because primaryChildFragment is a new fiber that we're inserting as the
        // parent of a new tree, we need to set its treeBaseDuration.
        if (enableProfilerTimer && workInProgress.mode & ProfileMode) {
          // treeBaseDuration is the sum of all the child tree base durations.
          var treeBaseDuration = 0;
          var hiddenChild = _primaryChildFragment.child;
          while (hiddenChild !== null) {
            treeBaseDuration += hiddenChild.treeBaseDuration;
            hiddenChild = hiddenChild.sibling;
          }
          _primaryChildFragment.treeBaseDuration = treeBaseDuration;
        }

        // Clone the fallback child fragment, too. These we'll continue
        // working on.
        var _fallbackChildFragment = _primaryChildFragment.sibling = createWorkInProgress(currentFallbackChildFragment, _nextFallbackChildren, currentFallbackChildFragment.expirationTime);
        child = _primaryChildFragment;
        _primaryChildFragment.childExpirationTime = NoWork;
        // Skip the primary children, and continue working on the
        // fallback children.
        next = _fallbackChildFragment;
        child.return = next.return = workInProgress;
      } else {
        // No longer suspended. Switch back to showing the primary children,
        // and remove the intermediate fragment fiber.
        var _nextPrimaryChildren = nextProps.children;
        var currentPrimaryChild = currentPrimaryChildFragment.child;
        var primaryChild = reconcileChildFibers(workInProgress, currentPrimaryChild, _nextPrimaryChildren, renderExpirationTime);

        // If this render doesn't suspend, we need to delete the fallback
        // children. Wait until the complete phase, after we've confirmed the
        // fallback is no longer needed.
        // TODO: Would it be better to store the fallback fragment on
        // the stateNode?

        // Continue rendering the children, like we normally do.
        child = next = primaryChild;
      }
    } else {
      // The current tree has not already timed out. That means the primary
      // children are not wrapped in a fragment fiber.
      var _currentPrimaryChild = current$$1.child;
      if (nextDidTimeout) {
        // Timed out. Wrap the children in a fragment fiber to keep them
        // separate from the fallback children.
        var _nextFallbackChildren2 = nextProps.fallback;
        var _primaryChildFragment2 = createFiberFromFragment(
        // It shouldn't matter what the pending props are because we aren't
        // going to render this fragment.
        null, mode, NoWork, null);
        _primaryChildFragment2.child = _currentPrimaryChild;

        // Even though we're creating a new fiber, there are no new children,
        // because we're reusing an already mounted tree. So we don't need to
        // schedule a placement.
        // primaryChildFragment.effectTag |= Placement;

        if ((workInProgress.mode & ConcurrentMode) === NoContext) {
          // Outside of concurrent mode, we commit the effects from the
          var _progressedState2 = workInProgress.memoizedState;
          var _progressedPrimaryChild2 = _progressedState2 !== null ? workInProgress.child.child : workInProgress.child;
          _primaryChildFragment2.child = _progressedPrimaryChild2;
        }

        // Because primaryChildFragment is a new fiber that we're inserting as the
        // parent of a new tree, we need to set its treeBaseDuration.
        if (enableProfilerTimer && workInProgress.mode & ProfileMode) {
          // treeBaseDuration is the sum of all the child tree base durations.
          var _treeBaseDuration = 0;
          var _hiddenChild = _primaryChildFragment2.child;
          while (_hiddenChild !== null) {
            _treeBaseDuration += _hiddenChild.treeBaseDuration;
            _hiddenChild = _hiddenChild.sibling;
          }
          _primaryChildFragment2.treeBaseDuration = _treeBaseDuration;
        }

        // Create a fragment from the fallback children, too.
        var _fallbackChildFragment2 = _primaryChildFragment2.sibling = createFiberFromFragment(_nextFallbackChildren2, mode, renderExpirationTime, null);
        _fallbackChildFragment2.effectTag |= Placement;
        child = _primaryChildFragment2;
        _primaryChildFragment2.childExpirationTime = NoWork;
        // Skip the primary children, and continue working on the
        // fallback children.
        next = _fallbackChildFragment2;
        child.return = next.return = workInProgress;
      } else {
        // Still haven't timed out.  Continue rendering the children, like we
        // normally do.
        var _nextPrimaryChildren2 = nextProps.children;
        next = child = reconcileChildFibers(workInProgress, _currentPrimaryChild, _nextPrimaryChildren2, renderExpirationTime);
      }
    }
    workInProgress.stateNode = current$$1.stateNode;
  }

  workInProgress.memoizedState = nextState;
  workInProgress.child = child;
  return next;
}

function updateDehydratedSuspenseComponent(current$$1, workInProgress, renderExpirationTime) {
  if (current$$1 === null) {
    // During the first pass, we'll bail out and not drill into the children.
    // Instead, we'll leave the content in place and try to hydrate it later.
    workInProgress.expirationTime = Never;
    return null;
  }
  // We use childExpirationTime to indicate that a child might depend on context, so if
  // any context has changed, we need to treat is as if the input might have changed.
  var hasContextChanged$$1 = current$$1.childExpirationTime >= renderExpirationTime;
  if (didReceiveUpdate || hasContextChanged$$1) {
    // This boundary has changed since the first render. This means that we are now unable to
    // hydrate it. We might still be able to hydrate it using an earlier expiration time but
    // during this render we can't. Instead, we're going to delete the whole subtree and
    // instead inject a new real Suspense boundary to take its place, which may render content
    // or fallback. The real Suspense boundary will suspend for a while so we have some time
    // to ensure it can produce real content, but all state and pending events will be lost.

    // Detach from the current dehydrated boundary.
    current$$1.alternate = null;
    workInProgress.alternate = null;

    // Insert a deletion in the effect list.
    var returnFiber = workInProgress.return;
    !(returnFiber !== null) ? reactProdInvariant('315') : void 0;
    var last = returnFiber.lastEffect;
    if (last !== null) {
      last.nextEffect = current$$1;
      returnFiber.lastEffect = current$$1;
    } else {
      returnFiber.firstEffect = returnFiber.lastEffect = current$$1;
    }
    current$$1.nextEffect = null;
    current$$1.effectTag = Deletion;

    // Upgrade this work in progress to a real Suspense component.
    workInProgress.tag = SuspenseComponent;
    workInProgress.stateNode = null;
    workInProgress.memoizedState = null;
    // This is now an insertion.
    workInProgress.effectTag |= Placement;
    // Retry as a real Suspense component.
    return updateSuspenseComponent(null, workInProgress, renderExpirationTime);
  }
  if ((workInProgress.effectTag & DidCapture) === NoEffect) {
    // This is the first attempt.
    reenterHydrationStateFromDehydratedSuspenseInstance(workInProgress);
    var nextProps = workInProgress.pendingProps;
    var nextChildren = nextProps.children;
    workInProgress.child = mountChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
    return workInProgress.child;
  } else {
    // Something suspended. Leave the existing children in place.
    // TODO: In non-concurrent mode, should we commit the nodes we have hydrated so far?
    workInProgress.child = null;
    return null;
  }
}

function updatePortalComponent(current$$1, workInProgress, renderExpirationTime) {
  pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
  var nextChildren = workInProgress.pendingProps;
  if (current$$1 === null) {
    // Portals are special because we don't append the children during mount
    // but at commit. Therefore we need to track insertions which the normal
    // flow doesn't do during mount. This doesn't happen at the root because
    // the root always starts with a "current" with a null child.
    // TODO: Consider unifying this with how the root works.
    workInProgress.child = reconcileChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
  } else {
    reconcileChildren(current$$1, workInProgress, nextChildren, renderExpirationTime);
  }
  return workInProgress.child;
}

function updateContextProvider(current$$1, workInProgress, renderExpirationTime) {
  var providerType = workInProgress.type;
  var context = providerType._context;

  var newProps = workInProgress.pendingProps;
  var oldProps = workInProgress.memoizedProps;

  var newValue = newProps.value;

  pushProvider(workInProgress, newValue);

  if (oldProps !== null) {
    var oldValue = oldProps.value;
    var changedBits = calculateChangedBits(context, newValue, oldValue);
    if (changedBits === 0) {
      // No change. Bailout early if children are the same.
      if (oldProps.children === newProps.children && !hasContextChanged()) {
        return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
      }
    } else {
      // The context value changed. Search for matching consumers and schedule
      // them to update.
      propagateContextChange(workInProgress, context, changedBits, renderExpirationTime);
    }
  }

  var newChildren = newProps.children;
  reconcileChildren(current$$1, workInProgress, newChildren, renderExpirationTime);
  return workInProgress.child;
}

function updateContextConsumer(current$$1, workInProgress, renderExpirationTime) {
  var context = workInProgress.type;
  // The logic below for Context differs depending on PROD or DEV mode. In
  // DEV mode, we create a separate object for Context.Consumer that acts
  // like a proxy to Context. This proxy object adds unnecessary code in PROD
  // so we use the old behaviour (Context.Consumer references Context) to
  // reduce size and overhead. The separate object references context via
  // a property called "_context", which also gives us the ability to check
  // in DEV mode if this property exists or not and warn if it does not.
  var newProps = workInProgress.pendingProps;
  var render = newProps.children;

  prepareToReadContext(workInProgress, renderExpirationTime);
  var newValue = readContext(context, newProps.unstable_observedBits);
  var newChildren = void 0;
  {
    newChildren = render(newValue);
  }

  // React DevTools reads this flag.
  workInProgress.effectTag |= PerformedWork;
  reconcileChildren(current$$1, workInProgress, newChildren, renderExpirationTime);
  return workInProgress.child;
}

function markWorkInProgressReceivedUpdate() {
  didReceiveUpdate = true;
}

function bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime) {
  cancelWorkTimer(workInProgress);

  if (current$$1 !== null) {
    // Reuse previous context list
    workInProgress.contextDependencies = current$$1.contextDependencies;
  }

  if (enableProfilerTimer) {
    // Don't update "base" render times for bailouts.
    stopProfilerTimerIfRunning(workInProgress);
  }

  // Check if the children have any pending work.
  var childExpirationTime = workInProgress.childExpirationTime;
  if (childExpirationTime < renderExpirationTime) {
    // The children don't have any work either. We can skip them.
    // TODO: Once we add back resuming, we should check if the children are
    // a work-in-progress set. If so, we need to transfer their effects.
    return null;
  } else {
    // This fiber doesn't have work, but its subtree does. Clone the child
    // fibers and continue.
    cloneChildFibers(current$$1, workInProgress);
    return workInProgress.child;
  }
}

function beginWork(current$$1, workInProgress, renderExpirationTime) {
  var updateExpirationTime = workInProgress.expirationTime;

  if (current$$1 !== null) {
    var oldProps = current$$1.memoizedProps;
    var newProps = workInProgress.pendingProps;

    if (oldProps !== newProps || hasContextChanged()) {
      // If props or context changed, mark the fiber as having performed work.
      // This may be unset if the props are determined to be equal later (memo).
      didReceiveUpdate = true;
    } else if (updateExpirationTime < renderExpirationTime) {
      didReceiveUpdate = false;
      // This fiber does not have any pending work. Bailout without entering
      // the begin phase. There's still some bookkeeping we that needs to be done
      // in this optimized path, mostly pushing stuff onto the stack.
      switch (workInProgress.tag) {
        case HostRoot:
          pushHostRootContext(workInProgress);
          resetHydrationState();
          break;
        case HostComponent:
          pushHostContext(workInProgress);
          break;
        case ClassComponent:
          {
            var Component = workInProgress.type;
            if (isContextProvider(Component)) {
              pushContextProvider(workInProgress);
            }
            break;
          }
        case HostPortal:
          pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
          break;
        case ContextProvider:
          {
            var newValue = workInProgress.memoizedProps.value;
            pushProvider(workInProgress, newValue);
            break;
          }
        case Profiler:
          if (enableProfilerTimer) {
            workInProgress.effectTag |= Update;
          }
          break;
        case SuspenseComponent:
          {
            var state = workInProgress.memoizedState;
            var didTimeout = state !== null;
            if (didTimeout) {
              // If this boundary is currently timed out, we need to decide
              // whether to retry the primary children, or to skip over it and
              // go straight to the fallback. Check the priority of the primary
              var primaryChildFragment = workInProgress.child;
              var primaryChildExpirationTime = primaryChildFragment.childExpirationTime;
              if (primaryChildExpirationTime !== NoWork && primaryChildExpirationTime >= renderExpirationTime) {
                // The primary children have pending work. Use the normal path
                // to attempt to render the primary children again.
                return updateSuspenseComponent(current$$1, workInProgress, renderExpirationTime);
              } else {
                // The primary children do not have pending work with sufficient
                // priority. Bailout.
                var child = bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
                if (child !== null) {
                  // The fallback children have pending work. Skip over the
                  // primary children and work on the fallback.
                  return child.sibling;
                } else {
                  return null;
                }
              }
            }
            break;
          }
        case DehydratedSuspenseComponent:
          {
            if (enableSuspenseServerRenderer) {
              // We know that this component will suspend again because if it has
              // been unsuspended it has committed as a regular Suspense component.
              // If it needs to be retried, it should have work scheduled on it.
              workInProgress.effectTag |= DidCapture;
              break;
            }
          }
      }
      return bailoutOnAlreadyFinishedWork(current$$1, workInProgress, renderExpirationTime);
    }
  } else {
    didReceiveUpdate = false;
  }

  // Before entering the begin phase, clear the expiration time.
  workInProgress.expirationTime = NoWork;

  switch (workInProgress.tag) {
    case IndeterminateComponent:
      {
        var elementType = workInProgress.elementType;
        return mountIndeterminateComponent(current$$1, workInProgress, elementType, renderExpirationTime);
      }
    case LazyComponent:
      {
        var _elementType = workInProgress.elementType;
        return mountLazyComponent(current$$1, workInProgress, _elementType, updateExpirationTime, renderExpirationTime);
      }
    case FunctionComponent:
      {
        var _Component = workInProgress.type;
        var unresolvedProps = workInProgress.pendingProps;
        var resolvedProps = workInProgress.elementType === _Component ? unresolvedProps : resolveDefaultProps(_Component, unresolvedProps);
        return updateFunctionComponent(current$$1, workInProgress, _Component, resolvedProps, renderExpirationTime);
      }
    case ClassComponent:
      {
        var _Component2 = workInProgress.type;
        var _unresolvedProps = workInProgress.pendingProps;
        var _resolvedProps = workInProgress.elementType === _Component2 ? _unresolvedProps : resolveDefaultProps(_Component2, _unresolvedProps);
        return updateClassComponent(current$$1, workInProgress, _Component2, _resolvedProps, renderExpirationTime);
      }
    case HostRoot:
      return updateHostRoot(current$$1, workInProgress, renderExpirationTime);
    case HostComponent:
      return updateHostComponent(current$$1, workInProgress, renderExpirationTime);
    case HostText:
      return updateHostText(current$$1, workInProgress);
    case SuspenseComponent:
      return updateSuspenseComponent(current$$1, workInProgress, renderExpirationTime);
    case HostPortal:
      return updatePortalComponent(current$$1, workInProgress, renderExpirationTime);
    case ForwardRef:
      {
        var type = workInProgress.type;
        var _unresolvedProps2 = workInProgress.pendingProps;
        var _resolvedProps2 = workInProgress.elementType === type ? _unresolvedProps2 : resolveDefaultProps(type, _unresolvedProps2);
        return updateForwardRef(current$$1, workInProgress, type, _resolvedProps2, renderExpirationTime);
      }
    case Fragment:
      return updateFragment(current$$1, workInProgress, renderExpirationTime);
    case Mode:
      return updateMode(current$$1, workInProgress, renderExpirationTime);
    case Profiler:
      return updateProfiler(current$$1, workInProgress, renderExpirationTime);
    case ContextProvider:
      return updateContextProvider(current$$1, workInProgress, renderExpirationTime);
    case ContextConsumer:
      return updateContextConsumer(current$$1, workInProgress, renderExpirationTime);
    case MemoComponent:
      {
        var _type2 = workInProgress.type;
        var _unresolvedProps3 = workInProgress.pendingProps;
        // Resolve outer props first, then resolve inner props.
        var _resolvedProps3 = resolveDefaultProps(_type2, _unresolvedProps3);
        _resolvedProps3 = resolveDefaultProps(_type2.type, _resolvedProps3);
        return updateMemoComponent(current$$1, workInProgress, _type2, _resolvedProps3, updateExpirationTime, renderExpirationTime);
      }
    case SimpleMemoComponent:
      {
        return updateSimpleMemoComponent(current$$1, workInProgress, workInProgress.type, workInProgress.pendingProps, updateExpirationTime, renderExpirationTime);
      }
    case IncompleteClassComponent:
      {
        var _Component3 = workInProgress.type;
        var _unresolvedProps4 = workInProgress.pendingProps;
        var _resolvedProps4 = workInProgress.elementType === _Component3 ? _unresolvedProps4 : resolveDefaultProps(_Component3, _unresolvedProps4);
        return mountIncompleteClassComponent(current$$1, workInProgress, _Component3, _resolvedProps4, renderExpirationTime);
      }
    case DehydratedSuspenseComponent:
      {
        if (enableSuspenseServerRenderer) {
          return updateDehydratedSuspenseComponent(current$$1, workInProgress, renderExpirationTime);
        }
        break;
      }
  }
  reactProdInvariant('156');
}

var valueCursor = createCursor(null);

var currentlyRenderingFiber = null;
var lastContextDependency = null;
var lastContextWithAllBitsObserved = null;

function resetContextDependences() {
  // This is called right before React yields execution, to ensure `readContext`
  // cannot be called outside the render phase.
  currentlyRenderingFiber = null;
  lastContextDependency = null;
  lastContextWithAllBitsObserved = null;
  
}





function pushProvider(providerFiber, nextValue) {
  var context = providerFiber.type._context;

  if (isPrimaryRenderer) {
    push(valueCursor, context._currentValue, providerFiber);

    context._currentValue = nextValue;
    
  } else {
    push(valueCursor, context._currentValue2, providerFiber);

    context._currentValue2 = nextValue;
    
  }
}

function popProvider(providerFiber) {
  var currentValue = valueCursor.current;

  pop(valueCursor, providerFiber);

  var context = providerFiber.type._context;
  if (isPrimaryRenderer) {
    context._currentValue = currentValue;
  } else {
    context._currentValue2 = currentValue;
  }
}

function calculateChangedBits(context, newValue, oldValue) {
  if (is(oldValue, newValue)) {
    // No change
    return 0;
  } else {
    var changedBits = typeof context._calculateChangedBits === 'function' ? context._calculateChangedBits(oldValue, newValue) : maxSigned31BitInt;

    return changedBits | 0;
  }
}

function scheduleWorkOnParentPath(parent, renderExpirationTime) {
  // Update the child expiration time of all the ancestors, including
  // the alternates.
  var node = parent;
  while (node !== null) {
    var alternate = node.alternate;
    if (node.childExpirationTime < renderExpirationTime) {
      node.childExpirationTime = renderExpirationTime;
      if (alternate !== null && alternate.childExpirationTime < renderExpirationTime) {
        alternate.childExpirationTime = renderExpirationTime;
      }
    } else if (alternate !== null && alternate.childExpirationTime < renderExpirationTime) {
      alternate.childExpirationTime = renderExpirationTime;
    } else {
      // Neither alternate was updated, which means the rest of the
      // ancestor path already has sufficient priority.
      break;
    }
    node = node.return;
  }
}

function propagateContextChange(workInProgress, context, changedBits, renderExpirationTime) {
  var fiber = workInProgress.child;
  if (fiber !== null) {
    // Set the return pointer of the child to the work-in-progress fiber.
    fiber.return = workInProgress;
  }
  while (fiber !== null) {
    var nextFiber = void 0;

    // Visit this fiber.
    var list = fiber.contextDependencies;
    if (list !== null) {
      nextFiber = fiber.child;

      var dependency = list.first;
      while (dependency !== null) {
        // Check if the context matches.
        if (dependency.context === context && (dependency.observedBits & changedBits) !== 0) {
          // Match! Schedule an update on this fiber.

          if (fiber.tag === ClassComponent) {
            // Schedule a force update on the work-in-progress.
            var update = createUpdate(renderExpirationTime);
            update.tag = ForceUpdate;
            // TODO: Because we don't have a work-in-progress, this will add the
            // update to the current fiber, too, which means it will persist even if
            // this render is thrown away. Since it's a race condition, not sure it's
            // worth fixing.
            enqueueUpdate(fiber, update);
          }

          if (fiber.expirationTime < renderExpirationTime) {
            fiber.expirationTime = renderExpirationTime;
          }
          var alternate = fiber.alternate;
          if (alternate !== null && alternate.expirationTime < renderExpirationTime) {
            alternate.expirationTime = renderExpirationTime;
          }

          scheduleWorkOnParentPath(fiber.return, renderExpirationTime);

          // Mark the expiration time on the list, too.
          if (list.expirationTime < renderExpirationTime) {
            list.expirationTime = renderExpirationTime;
          }

          // Since we already found a match, we can stop traversing the
          // dependency list.
          break;
        }
        dependency = dependency.next;
      }
    } else if (fiber.tag === ContextProvider) {
      // Don't scan deeper if this is a matching provider
      nextFiber = fiber.type === workInProgress.type ? null : fiber.child;
    } else if (enableSuspenseServerRenderer && fiber.tag === DehydratedSuspenseComponent) {
      // If a dehydrated suspense component is in this subtree, we don't know
      // if it will have any context consumers in it. The best we can do is
      // mark it as having updates on its children.
      if (fiber.expirationTime < renderExpirationTime) {
        fiber.expirationTime = renderExpirationTime;
      }
      var _alternate = fiber.alternate;
      if (_alternate !== null && _alternate.expirationTime < renderExpirationTime) {
        _alternate.expirationTime = renderExpirationTime;
      }
      // This is intentionally passing this fiber as the parent
      // because we want to schedule this fiber as having work
      // on its children. We'll use the childExpirationTime on
      // this fiber to indicate that a context has changed.
      scheduleWorkOnParentPath(fiber, renderExpirationTime);
      nextFiber = fiber.sibling;
    } else {
      // Traverse down.
      nextFiber = fiber.child;
    }

    if (nextFiber !== null) {
      // Set the return pointer of the child to the work-in-progress fiber.
      nextFiber.return = fiber;
    } else {
      // No child. Traverse to next sibling.
      nextFiber = fiber;
      while (nextFiber !== null) {
        if (nextFiber === workInProgress) {
          // We're back to the root of this subtree. Exit.
          nextFiber = null;
          break;
        }
        var sibling = nextFiber.sibling;
        if (sibling !== null) {
          // Set the return pointer of the sibling to the work-in-progress fiber.
          sibling.return = nextFiber.return;
          nextFiber = sibling;
          break;
        }
        // No more siblings. Traverse up.
        nextFiber = nextFiber.return;
      }
    }
    fiber = nextFiber;
  }
}

function prepareToReadContext(workInProgress, renderExpirationTime) {
  currentlyRenderingFiber = workInProgress;
  lastContextDependency = null;
  lastContextWithAllBitsObserved = null;

  var currentDependencies = workInProgress.contextDependencies;
  if (currentDependencies !== null && currentDependencies.expirationTime >= renderExpirationTime) {
    // Context list has a pending update. Mark that this fiber performed work.
    markWorkInProgressReceivedUpdate();
  }

  // Reset the work-in-progress list
  workInProgress.contextDependencies = null;
}

function readContext(context, observedBits) {
  if (lastContextWithAllBitsObserved === context) {
    // Nothing to do. We already observe everything in this context.
  } else if (observedBits === false || observedBits === 0) {
    // Do not observe any updates.
  } else {
    var resolvedObservedBits = void 0; // Avoid deopting on observable arguments or heterogeneous types.
    if (typeof observedBits !== 'number' || observedBits === maxSigned31BitInt) {
      // Observe all updates.
      lastContextWithAllBitsObserved = context;
      resolvedObservedBits = maxSigned31BitInt;
    } else {
      resolvedObservedBits = observedBits;
    }

    var contextItem = {
      context: context,
      observedBits: resolvedObservedBits,
      next: null
    };

    if (lastContextDependency === null) {
      !(currentlyRenderingFiber !== null) ? reactProdInvariant('308') : void 0;

      // This is the first dependency for this component. Create a new list.
      lastContextDependency = contextItem;
      currentlyRenderingFiber.contextDependencies = {
        first: contextItem,
        expirationTime: NoWork
      };
    } else {
      // Append a new context item.
      lastContextDependency = lastContextDependency.next = contextItem;
    }
  }
  return isPrimaryRenderer ? context._currentValue : context._currentValue2;
}

// UpdateQueue is a linked list of prioritized updates.
//
// Like fibers, update queues come in pairs: a current queue, which represents
// the visible state of the screen, and a work-in-progress queue, which can be
// mutated and processed asynchronously before it is committed — a form of
// double buffering. If a work-in-progress render is discarded before finishing,
// we create a new work-in-progress by cloning the current queue.
//
// Both queues share a persistent, singly-linked list structure. To schedule an
// update, we append it to the end of both queues. Each queue maintains a
// pointer to first update in the persistent list that hasn't been processed.
// The work-in-progress pointer always has a position equal to or greater than
// the current queue, since we always work on that one. The current queue's
// pointer is only updated during the commit phase, when we swap in the
// work-in-progress.
//
// For example:
//
//   Current pointer:           A - B - C - D - E - F
//   Work-in-progress pointer:              D - E - F
//                                          ^
//                                          The work-in-progress queue has
//                                          processed more updates than current.
//
// The reason we append to both queues is because otherwise we might drop
// updates without ever processing them. For example, if we only add updates to
// the work-in-progress queue, some updates could be lost whenever a work-in
// -progress render restarts by cloning from current. Similarly, if we only add
// updates to the current queue, the updates will be lost whenever an already
// in-progress queue commits and swaps with the current queue. However, by
// adding to both queues, we guarantee that the update will be part of the next
// work-in-progress. (And because the work-in-progress queue becomes the
// current queue once it commits, there's no danger of applying the same
// update twice.)
//
// Prioritization
// --------------
//
// Updates are not sorted by priority, but by insertion; new updates are always
// appended to the end of the list.
//
// The priority is still important, though. When processing the update queue
// during the render phase, only the updates with sufficient priority are
// included in the result. If we skip an update because it has insufficient
// priority, it remains in the queue to be processed later, during a lower
// priority render. Crucially, all updates subsequent to a skipped update also
// remain in the queue *regardless of their priority*. That means high priority
// updates are sometimes processed twice, at two separate priorities. We also
// keep track of a base state, that represents the state before the first
// update in the queue is applied.
//
// For example:
//
//   Given a base state of '', and the following queue of updates
//
//     A1 - B2 - C1 - D2
//
//   where the number indicates the priority, and the update is applied to the
//   previous state by appending a letter, React will process these updates as
//   two separate renders, one per distinct priority level:
//
//   First render, at priority 1:
//     Base state: ''
//     Updates: [A1, C1]
//     Result state: 'AC'
//
//   Second render, at priority 2:
//     Base state: 'A'            <-  The base state does not include C1,
//                                    because B2 was skipped.
//     Updates: [B2, C1, D2]      <-  C1 was rebased on top of B2
//     Result state: 'ABCD'
//
// Because we process updates in insertion order, and rebase high priority
// updates when preceding updates are skipped, the final result is deterministic
// regardless of priority. Intermediate state may vary according to system
// resources, but the final state is always the same.

var UpdateState = 0;
var ReplaceState = 1;
var ForceUpdate = 2;
var CaptureUpdate = 3;

// Global state that is reset at the beginning of calling `processUpdateQueue`.
// It should only be read right after calling `processUpdateQueue`, via
// `checkHasForceUpdateAfterProcessing`.
var hasForceUpdate = false;


function createUpdateQueue(baseState) {
  var queue = {
    baseState: baseState,
    firstUpdate: null,
    lastUpdate: null,
    firstCapturedUpdate: null,
    lastCapturedUpdate: null,
    firstEffect: null,
    lastEffect: null,
    firstCapturedEffect: null,
    lastCapturedEffect: null
  };
  return queue;
}

function cloneUpdateQueue(currentQueue) {
  var queue = {
    baseState: currentQueue.baseState,
    firstUpdate: currentQueue.firstUpdate,
    lastUpdate: currentQueue.lastUpdate,

    // TODO: With resuming, if we bail out and resuse the child tree, we should
    // keep these effects.
    firstCapturedUpdate: null,
    lastCapturedUpdate: null,

    firstEffect: null,
    lastEffect: null,

    firstCapturedEffect: null,
    lastCapturedEffect: null
  };
  return queue;
}

function createUpdate(expirationTime) {
  return {
    expirationTime: expirationTime,

    tag: UpdateState,
    payload: null,
    callback: null,

    next: null,
    nextEffect: null
  };
}

function appendUpdateToQueue(queue, update) {
  // Append the update to the end of the list.
  if (queue.lastUpdate === null) {
    // Queue is empty
    queue.firstUpdate = queue.lastUpdate = update;
  } else {
    queue.lastUpdate.next = update;
    queue.lastUpdate = update;
  }
}

function enqueueUpdate(fiber, update) {
  // Update queues are created lazily.
  var alternate = fiber.alternate;
  var queue1 = void 0;
  var queue2 = void 0;
  if (alternate === null) {
    // There's only one fiber.
    queue1 = fiber.updateQueue;
    queue2 = null;
    if (queue1 === null) {
      queue1 = fiber.updateQueue = createUpdateQueue(fiber.memoizedState);
    }
  } else {
    // There are two owners.
    queue1 = fiber.updateQueue;
    queue2 = alternate.updateQueue;
    if (queue1 === null) {
      if (queue2 === null) {
        // Neither fiber has an update queue. Create new ones.
        queue1 = fiber.updateQueue = createUpdateQueue(fiber.memoizedState);
        queue2 = alternate.updateQueue = createUpdateQueue(alternate.memoizedState);
      } else {
        // Only one fiber has an update queue. Clone to create a new one.
        queue1 = fiber.updateQueue = cloneUpdateQueue(queue2);
      }
    } else {
      if (queue2 === null) {
        // Only one fiber has an update queue. Clone to create a new one.
        queue2 = alternate.updateQueue = cloneUpdateQueue(queue1);
      } else {
        // Both owners have an update queue.
      }
    }
  }
  if (queue2 === null || queue1 === queue2) {
    // There's only a single queue.
    appendUpdateToQueue(queue1, update);
  } else {
    // There are two queues. We need to append the update to both queues,
    // while accounting for the persistent structure of the list — we don't
    // want the same update to be added multiple times.
    if (queue1.lastUpdate === null || queue2.lastUpdate === null) {
      // One of the queues is not empty. We must add the update to both queues.
      appendUpdateToQueue(queue1, update);
      appendUpdateToQueue(queue2, update);
    } else {
      // Both queues are non-empty. The last update is the same in both lists,
      // because of structural sharing. So, only append to one of the lists.
      appendUpdateToQueue(queue1, update);
      // But we still need to update the `lastUpdate` pointer of queue2.
      queue2.lastUpdate = update;
    }
  }

  
}

function enqueueCapturedUpdate(workInProgress, update) {
  // Captured updates go into a separate list, and only on the work-in-
  // progress queue.
  var workInProgressQueue = workInProgress.updateQueue;
  if (workInProgressQueue === null) {
    workInProgressQueue = workInProgress.updateQueue = createUpdateQueue(workInProgress.memoizedState);
  } else {
    // TODO: I put this here rather than createWorkInProgress so that we don't
    // clone the queue unnecessarily. There's probably a better way to
    // structure this.
    workInProgressQueue = ensureWorkInProgressQueueIsAClone(workInProgress, workInProgressQueue);
  }

  // Append the update to the end of the list.
  if (workInProgressQueue.lastCapturedUpdate === null) {
    // This is the first render phase update
    workInProgressQueue.firstCapturedUpdate = workInProgressQueue.lastCapturedUpdate = update;
  } else {
    workInProgressQueue.lastCapturedUpdate.next = update;
    workInProgressQueue.lastCapturedUpdate = update;
  }
}

function ensureWorkInProgressQueueIsAClone(workInProgress, queue) {
  var current = workInProgress.alternate;
  if (current !== null) {
    // If the work-in-progress queue is equal to the current queue,
    // we need to clone it first.
    if (queue === current.updateQueue) {
      queue = workInProgress.updateQueue = cloneUpdateQueue(queue);
    }
  }
  return queue;
}

function getStateFromUpdate(workInProgress, queue, update, prevState, nextProps, instance) {
  switch (update.tag) {
    case ReplaceState:
      {
        var _payload = update.payload;
        if (typeof _payload === 'function') {
          // Updater function
          var nextState = _payload.call(instance, prevState, nextProps);
          return nextState;
        }
        // State object
        return _payload;
      }
    case CaptureUpdate:
      {
        workInProgress.effectTag = workInProgress.effectTag & ~ShouldCapture | DidCapture;
      }
    // Intentional fallthrough
    case UpdateState:
      {
        var _payload2 = update.payload;
        var partialState = void 0;
        if (typeof _payload2 === 'function') {
          // Updater function
          partialState = _payload2.call(instance, prevState, nextProps);
          
        } else {
          // Partial state object
          partialState = _payload2;
        }
        if (partialState === null || partialState === undefined) {
          // Null and undefined are treated as no-ops.
          return prevState;
        }
        // Merge the partial state and the previous state.
        return _assign({}, prevState, partialState);
      }
    case ForceUpdate:
      {
        hasForceUpdate = true;
        return prevState;
      }
  }
  return prevState;
}

function processUpdateQueue(workInProgress, queue, props, instance, renderExpirationTime) {
  hasForceUpdate = false;

  queue = ensureWorkInProgressQueueIsAClone(workInProgress, queue);

  var newBaseState = queue.baseState;
  var newFirstUpdate = null;
  var newExpirationTime = NoWork;

  // Iterate through the list of updates to compute the result.
  var update = queue.firstUpdate;
  var resultState = newBaseState;
  while (update !== null) {
    var updateExpirationTime = update.expirationTime;
    if (updateExpirationTime < renderExpirationTime) {
      // This update does not have sufficient priority. Skip it.
      if (newFirstUpdate === null) {
        // This is the first skipped update. It will be the first update in
        // the new list.
        newFirstUpdate = update;
        // Since this is the first update that was skipped, the current result
        // is the new base state.
        newBaseState = resultState;
      }
      // Since this update will remain in the list, update the remaining
      // expiration time.
      if (newExpirationTime < updateExpirationTime) {
        newExpirationTime = updateExpirationTime;
      }
    } else {
      // This update does have sufficient priority. Process it and compute
      // a new result.
      resultState = getStateFromUpdate(workInProgress, queue, update, resultState, props, instance);
      var _callback = update.callback;
      if (_callback !== null) {
        workInProgress.effectTag |= Callback;
        // Set this to null, in case it was mutated during an aborted render.
        update.nextEffect = null;
        if (queue.lastEffect === null) {
          queue.firstEffect = queue.lastEffect = update;
        } else {
          queue.lastEffect.nextEffect = update;
          queue.lastEffect = update;
        }
      }
    }
    // Continue to the next update.
    update = update.next;
  }

  // Separately, iterate though the list of captured updates.
  var newFirstCapturedUpdate = null;
  update = queue.firstCapturedUpdate;
  while (update !== null) {
    var _updateExpirationTime = update.expirationTime;
    if (_updateExpirationTime < renderExpirationTime) {
      // This update does not have sufficient priority. Skip it.
      if (newFirstCapturedUpdate === null) {
        // This is the first skipped captured update. It will be the first
        // update in the new list.
        newFirstCapturedUpdate = update;
        // If this is the first update that was skipped, the current result is
        // the new base state.
        if (newFirstUpdate === null) {
          newBaseState = resultState;
        }
      }
      // Since this update will remain in the list, update the remaining
      // expiration time.
      if (newExpirationTime < _updateExpirationTime) {
        newExpirationTime = _updateExpirationTime;
      }
    } else {
      // This update does have sufficient priority. Process it and compute
      // a new result.
      resultState = getStateFromUpdate(workInProgress, queue, update, resultState, props, instance);
      var _callback2 = update.callback;
      if (_callback2 !== null) {
        workInProgress.effectTag |= Callback;
        // Set this to null, in case it was mutated during an aborted render.
        update.nextEffect = null;
        if (queue.lastCapturedEffect === null) {
          queue.firstCapturedEffect = queue.lastCapturedEffect = update;
        } else {
          queue.lastCapturedEffect.nextEffect = update;
          queue.lastCapturedEffect = update;
        }
      }
    }
    update = update.next;
  }

  if (newFirstUpdate === null) {
    queue.lastUpdate = null;
  }
  if (newFirstCapturedUpdate === null) {
    queue.lastCapturedUpdate = null;
  } else {
    workInProgress.effectTag |= Callback;
  }
  if (newFirstUpdate === null && newFirstCapturedUpdate === null) {
    // We processed every update, without skipping. That means the new base
    // state is the same as the result state.
    newBaseState = resultState;
  }

  queue.baseState = newBaseState;
  queue.firstUpdate = newFirstUpdate;
  queue.firstCapturedUpdate = newFirstCapturedUpdate;

  // Set the remaining expiration time to be whatever is remaining in the queue.
  // This should be fine because the only two other things that contribute to
  // expiration time are props and context. We're already in the middle of the
  // begin phase by the time we start processing the queue, so we've already
  // dealt with the props. Context in components that specify
  // shouldComponentUpdate is tricky; but we'll have to account for
  // that regardless.
  workInProgress.expirationTime = newExpirationTime;
  workInProgress.memoizedState = resultState;

  
}

function callCallback(callback, context) {
  !(typeof callback === 'function') ? reactProdInvariant('191', callback) : void 0;
  callback.call(context);
}

function resetHasForceUpdateBeforeProcessing() {
  hasForceUpdate = false;
}

function checkHasForceUpdateAfterProcessing() {
  return hasForceUpdate;
}

function commitUpdateQueue(finishedWork, finishedQueue, instance, renderExpirationTime) {
  // If the finished render included captured updates, and there are still
  // lower priority updates left over, we need to keep the captured updates
  // in the queue so that they are rebased and not dropped once we process the
  // queue again at the lower priority.
  if (finishedQueue.firstCapturedUpdate !== null) {
    // Join the captured update list to the end of the normal list.
    if (finishedQueue.lastUpdate !== null) {
      finishedQueue.lastUpdate.next = finishedQueue.firstCapturedUpdate;
      finishedQueue.lastUpdate = finishedQueue.lastCapturedUpdate;
    }
    // Clear the list of captured updates.
    finishedQueue.firstCapturedUpdate = finishedQueue.lastCapturedUpdate = null;
  }

  // Commit the effects
  commitUpdateEffects(finishedQueue.firstEffect, instance);
  finishedQueue.firstEffect = finishedQueue.lastEffect = null;

  commitUpdateEffects(finishedQueue.firstCapturedEffect, instance);
  finishedQueue.firstCapturedEffect = finishedQueue.lastCapturedEffect = null;
}

function commitUpdateEffects(effect, instance) {
  while (effect !== null) {
    var _callback3 = effect.callback;
    if (_callback3 !== null) {
      effect.callback = null;
      callCallback(_callback3, instance);
    }
    effect = effect.nextEffect;
  }
}

function createCapturedValue(value, source) {
  // If the value is an error, call this function immediately after it is thrown
  // so the stack is accurate.
  return {
    value: value,
    source: source,
    stack: getStackByFiberInDevAndProd(source)
  };
}

function markUpdate(workInProgress) {
  // Tag the fiber with an update effect. This turns a Placement into
  // a PlacementAndUpdate.
  workInProgress.effectTag |= Update;
}

function markRef$1(workInProgress) {
  workInProgress.effectTag |= Ref;
}

var appendAllChildren = void 0;
var updateHostContainer = void 0;
var updateHostComponent$1 = void 0;
var updateHostText$1 = void 0;
if (supportsMutation) {
  // Mutation mode

  appendAllChildren = function (parent, workInProgress, needsVisibilityToggle, isHidden) {
    // We only have the top Fiber that was created but we need recurse down its
    // children to find all the terminal nodes.
    var node = workInProgress.child;
    while (node !== null) {
      if (node.tag === HostComponent || node.tag === HostText) {
        appendInitialChild(parent, node.stateNode);
      } else if (node.tag === HostPortal) {
        // If we have a portal child, then we don't want to traverse
        // down its children. Instead, we'll get insertions from each child in
        // the portal directly.
      } else if (node.child !== null) {
        node.child.return = node;
        node = node.child;
        continue;
      }
      if (node === workInProgress) {
        return;
      }
      while (node.sibling === null) {
        if (node.return === null || node.return === workInProgress) {
          return;
        }
        node = node.return;
      }
      node.sibling.return = node.return;
      node = node.sibling;
    }
  };

  updateHostContainer = function (workInProgress) {
    // Noop
  };
  updateHostComponent$1 = function (current, workInProgress, type, newProps, rootContainerInstance) {
    // If we have an alternate, that means this is an update and we need to
    // schedule a side-effect to do the updates.
    var oldProps = current.memoizedProps;
    if (oldProps === newProps) {
      // In mutation mode, this is sufficient for a bailout because
      // we won't touch this node even if children changed.
      return;
    }

    // If we get updated because one of our children updated, we don't
    // have newProps so we'll have to reuse them.
    // TODO: Split the update API as separate for the props vs. children.
    // Even better would be if children weren't special cased at all tho.
    var instance = workInProgress.stateNode;
    var currentHostContext = getHostContext();
    // TODO: Experiencing an error where oldProps is null. Suggests a host
    // component is hitting the resume path. Figure out why. Possibly
    // related to `hidden`.
    var updatePayload = prepareUpdate(instance, type, oldProps, newProps, rootContainerInstance, currentHostContext);
    // TODO: Type this specific to this type of component.
    workInProgress.updateQueue = updatePayload;
    // If the update payload indicates that there is a change or if there
    // is a new ref we mark this as an update. All the work is done in commitWork.
    if (updatePayload) {
      markUpdate(workInProgress);
    }
  };
  updateHostText$1 = function (current, workInProgress, oldText, newText) {
    // If the text differs, mark it as an update. All the work in done in commitWork.
    if (oldText !== newText) {
      markUpdate(workInProgress);
    }
  };
} else if (supportsPersistence) {
  // Persistent host tree mode

  appendAllChildren = function (parent, workInProgress, needsVisibilityToggle, isHidden) {
    // We only have the top Fiber that was created but we need recurse down its
    // children to find all the terminal nodes.
    var node = workInProgress.child;
    while (node !== null) {
      // eslint-disable-next-line no-labels
      branches: if (node.tag === HostComponent) {
        var instance = node.stateNode;
        if (needsVisibilityToggle) {
          var props = node.memoizedProps;
          var type = node.type;
          if (isHidden) {
            // This child is inside a timed out tree. Hide it.
            instance = cloneHiddenInstance(instance, type, props, node);
          } else {
            // This child was previously inside a timed out tree. If it was not
            // updated during this render, it may need to be unhidden. Clone
            // again to be sure.
            instance = cloneUnhiddenInstance(instance, type, props, node);
          }
          node.stateNode = instance;
        }
        appendInitialChild(parent, instance);
      } else if (node.tag === HostText) {
        var _instance = node.stateNode;
        if (needsVisibilityToggle) {
          var text = node.memoizedProps;
          var rootContainerInstance = getRootHostContainer();
          var currentHostContext = getHostContext();
          if (isHidden) {
            _instance = createHiddenTextInstance(text, rootContainerInstance, currentHostContext, workInProgress);
          } else {
            _instance = createTextInstance(text, rootContainerInstance, currentHostContext, workInProgress);
          }
          node.stateNode = _instance;
        }
        appendInitialChild(parent, _instance);
      } else if (node.tag === HostPortal) {
        // If we have a portal child, then we don't want to traverse
        // down its children. Instead, we'll get insertions from each child in
        // the portal directly.
      } else if (node.tag === SuspenseComponent) {
        var current = node.alternate;
        if (current !== null) {
          var oldState = current.memoizedState;
          var newState = node.memoizedState;
          var oldIsHidden = oldState !== null;
          var newIsHidden = newState !== null;
          if (oldIsHidden !== newIsHidden) {
            // The placeholder either just timed out or switched back to the normal
            // children after having previously timed out. Toggle the visibility of
            // the direct host children.
            var primaryChildParent = newIsHidden ? node.child : node;
            if (primaryChildParent !== null) {
              appendAllChildren(parent, primaryChildParent, true, newIsHidden);
            }
            // eslint-disable-next-line no-labels
            break branches;
          }
        }
        if (node.child !== null) {
          // Continue traversing like normal
          node.child.return = node;
          node = node.child;
          continue;
        }
      } else if (node.child !== null) {
        node.child.return = node;
        node = node.child;
        continue;
      }
      // $FlowFixMe This is correct but Flow is confused by the labeled break.
      node = node;
      if (node === workInProgress) {
        return;
      }
      while (node.sibling === null) {
        if (node.return === null || node.return === workInProgress) {
          return;
        }
        node = node.return;
      }
      node.sibling.return = node.return;
      node = node.sibling;
    }
  };

  // An unfortunate fork of appendAllChildren because we have two different parent types.
  var appendAllChildrenToContainer = function (containerChildSet, workInProgress, needsVisibilityToggle, isHidden) {
    // We only have the top Fiber that was created but we need recurse down its
    // children to find all the terminal nodes.
    var node = workInProgress.child;
    while (node !== null) {
      // eslint-disable-next-line no-labels
      branches: if (node.tag === HostComponent) {
        var instance = node.stateNode;
        if (needsVisibilityToggle) {
          var props = node.memoizedProps;
          var type = node.type;
          if (isHidden) {
            // This child is inside a timed out tree. Hide it.
            instance = cloneHiddenInstance(instance, type, props, node);
          } else {
            // This child was previously inside a timed out tree. If it was not
            // updated during this render, it may need to be unhidden. Clone
            // again to be sure.
            instance = cloneUnhiddenInstance(instance, type, props, node);
          }
          node.stateNode = instance;
        }
        appendChildToContainerChildSet(containerChildSet, instance);
      } else if (node.tag === HostText) {
        var _instance2 = node.stateNode;
        if (needsVisibilityToggle) {
          var text = node.memoizedProps;
          var rootContainerInstance = getRootHostContainer();
          var currentHostContext = getHostContext();
          if (isHidden) {
            _instance2 = createHiddenTextInstance(text, rootContainerInstance, currentHostContext, workInProgress);
          } else {
            _instance2 = createTextInstance(text, rootContainerInstance, currentHostContext, workInProgress);
          }
          node.stateNode = _instance2;
        }
        appendChildToContainerChildSet(containerChildSet, _instance2);
      } else if (node.tag === HostPortal) {
        // If we have a portal child, then we don't want to traverse
        // down its children. Instead, we'll get insertions from each child in
        // the portal directly.
      } else if (node.tag === SuspenseComponent) {
        var current = node.alternate;
        if (current !== null) {
          var oldState = current.memoizedState;
          var newState = node.memoizedState;
          var oldIsHidden = oldState !== null;
          var newIsHidden = newState !== null;
          if (oldIsHidden !== newIsHidden) {
            // The placeholder either just timed out or switched back to the normal
            // children after having previously timed out. Toggle the visibility of
            // the direct host children.
            var primaryChildParent = newIsHidden ? node.child : node;
            if (primaryChildParent !== null) {
              appendAllChildrenToContainer(containerChildSet, primaryChildParent, true, newIsHidden);
            }
            // eslint-disable-next-line no-labels
            break branches;
          }
        }
        if (node.child !== null) {
          // Continue traversing like normal
          node.child.return = node;
          node = node.child;
          continue;
        }
      } else if (node.child !== null) {
        node.child.return = node;
        node = node.child;
        continue;
      }
      // $FlowFixMe This is correct but Flow is confused by the labeled break.
      node = node;
      if (node === workInProgress) {
        return;
      }
      while (node.sibling === null) {
        if (node.return === null || node.return === workInProgress) {
          return;
        }
        node = node.return;
      }
      node.sibling.return = node.return;
      node = node.sibling;
    }
  };
  updateHostContainer = function (workInProgress) {
    var portalOrRoot = workInProgress.stateNode;
    var childrenUnchanged = workInProgress.firstEffect === null;
    if (childrenUnchanged) {
      // No changes, just reuse the existing instance.
    } else {
      var container = portalOrRoot.containerInfo;
      var newChildSet = createContainerChildSet(container);
      // If children might have changed, we have to add them all to the set.
      appendAllChildrenToContainer(newChildSet, workInProgress, false, false);
      portalOrRoot.pendingChildren = newChildSet;
      // Schedule an update on the container to swap out the container.
      markUpdate(workInProgress);
      finalizeContainerChildren(container, newChildSet);
    }
  };
  updateHostComponent$1 = function (current, workInProgress, type, newProps, rootContainerInstance) {
    var currentInstance = current.stateNode;
    var oldProps = current.memoizedProps;
    // If there are no effects associated with this node, then none of our children had any updates.
    // This guarantees that we can reuse all of them.
    var childrenUnchanged = workInProgress.firstEffect === null;
    if (childrenUnchanged && oldProps === newProps) {
      // No changes, just reuse the existing instance.
      // Note that this might release a previous clone.
      workInProgress.stateNode = currentInstance;
      return;
    }
    var recyclableInstance = workInProgress.stateNode;
    var currentHostContext = getHostContext();
    var updatePayload = null;
    if (oldProps !== newProps) {
      updatePayload = prepareUpdate(recyclableInstance, type, oldProps, newProps, rootContainerInstance, currentHostContext);
    }
    if (childrenUnchanged && updatePayload === null) {
      // No changes, just reuse the existing instance.
      // Note that this might release a previous clone.
      workInProgress.stateNode = currentInstance;
      return;
    }
    var newInstance = cloneInstance(currentInstance, updatePayload, type, oldProps, newProps, workInProgress, childrenUnchanged, recyclableInstance);
    if (finalizeInitialChildren(newInstance, type, newProps, rootContainerInstance, currentHostContext)) {
      markUpdate(workInProgress);
    }
    workInProgress.stateNode = newInstance;
    if (childrenUnchanged) {
      // If there are no other effects in this tree, we need to flag this node as having one.
      // Even though we're not going to use it for anything.
      // Otherwise parents won't know that there are new children to propagate upwards.
      markUpdate(workInProgress);
    } else {
      // If children might have changed, we have to add them all to the set.
      appendAllChildren(newInstance, workInProgress, false, false);
    }
  };
  updateHostText$1 = function (current, workInProgress, oldText, newText) {
    if (oldText !== newText) {
      // If the text content differs, we'll create a new text instance for it.
      var rootContainerInstance = getRootHostContainer();
      var currentHostContext = getHostContext();
      workInProgress.stateNode = createTextInstance(newText, rootContainerInstance, currentHostContext, workInProgress);
      // We'll have to mark it as having an effect, even though we won't use the effect for anything.
      // This lets the parents know that at least one of their children has changed.
      markUpdate(workInProgress);
    }
  };
} else {
  // No host operations
  updateHostContainer = function (workInProgress) {
    // Noop
  };
  updateHostComponent$1 = function (current, workInProgress, type, newProps, rootContainerInstance) {
    // Noop
  };
  updateHostText$1 = function (current, workInProgress, oldText, newText) {
    // Noop
  };
}

function completeWork(current, workInProgress, renderExpirationTime) {
  var newProps = workInProgress.pendingProps;

  switch (workInProgress.tag) {
    case IndeterminateComponent:
      break;
    case LazyComponent:
      break;
    case SimpleMemoComponent:
    case FunctionComponent:
      break;
    case ClassComponent:
      {
        var Component = workInProgress.type;
        if (isContextProvider(Component)) {
          popContext(workInProgress);
        }
        break;
      }
    case HostRoot:
      {
        popHostContainer(workInProgress);
        popTopLevelContextObject(workInProgress);
        var fiberRoot = workInProgress.stateNode;
        if (fiberRoot.pendingContext) {
          fiberRoot.context = fiberRoot.pendingContext;
          fiberRoot.pendingContext = null;
        }
        if (current === null || current.child === null) {
          // If we hydrated, pop so that we can delete any remaining children
          // that weren't hydrated.
          popHydrationState(workInProgress);
          // This resets the hacky state to fix isMounted before committing.
          // TODO: Delete this when we delete isMounted and findDOMNode.
          workInProgress.effectTag &= ~Placement;
        }
        updateHostContainer(workInProgress);
        break;
      }
    case HostComponent:
      {
        popHostContext(workInProgress);
        var rootContainerInstance = getRootHostContainer();
        var type = workInProgress.type;
        if (current !== null && workInProgress.stateNode != null) {
          updateHostComponent$1(current, workInProgress, type, newProps, rootContainerInstance);

          if (current.ref !== workInProgress.ref) {
            markRef$1(workInProgress);
          }
        } else {
          if (!newProps) {
            !(workInProgress.stateNode !== null) ? reactProdInvariant('166') : void 0;
            // This can happen when we abort work.
            break;
          }

          var currentHostContext = getHostContext();
          // TODO: Move createInstance to beginWork and keep it on a context
          // "stack" as the parent. Then append children as we go in beginWork
          // or completeWork depending on we want to add then top->down or
          // bottom->up. Top->down is faster in IE11.
          var wasHydrated = popHydrationState(workInProgress);
          if (wasHydrated) {
            // TODO: Move this and createInstance step into the beginPhase
            // to consolidate.
            if (prepareToHydrateHostInstance(workInProgress, rootContainerInstance, currentHostContext)) {
              // If changes to the hydrated node needs to be applied at the
              // commit-phase we mark this as such.
              markUpdate(workInProgress);
            }
          } else {
            var instance = createInstance(type, newProps, rootContainerInstance, currentHostContext, workInProgress);

            appendAllChildren(instance, workInProgress, false, false);

            // Certain renderers require commit-time effects for initial mount.
            // (eg DOM renderer supports auto-focus for certain elements).
            // Make sure such renderers get scheduled for later work.
            if (finalizeInitialChildren(instance, type, newProps, rootContainerInstance, currentHostContext)) {
              markUpdate(workInProgress);
            }
            workInProgress.stateNode = instance;
          }

          if (workInProgress.ref !== null) {
            // If there is a ref on a host node we need to schedule a callback
            markRef$1(workInProgress);
          }
        }
        break;
      }
    case HostText:
      {
        var newText = newProps;
        if (current && workInProgress.stateNode != null) {
          var oldText = current.memoizedProps;
          // If we have an alternate, that means this is an update and we need
          // to schedule a side-effect to do the updates.
          updateHostText$1(current, workInProgress, oldText, newText);
        } else {
          if (typeof newText !== 'string') {
            !(workInProgress.stateNode !== null) ? reactProdInvariant('166') : void 0;
            // This can happen when we abort work.
          }
          var _rootContainerInstance = getRootHostContainer();
          var _currentHostContext = getHostContext();
          var _wasHydrated = popHydrationState(workInProgress);
          if (_wasHydrated) {
            if (prepareToHydrateHostTextInstance(workInProgress)) {
              markUpdate(workInProgress);
            }
          } else {
            workInProgress.stateNode = createTextInstance(newText, _rootContainerInstance, _currentHostContext, workInProgress);
          }
        }
        break;
      }
    case ForwardRef:
      break;
    case SuspenseComponent:
      {
        var nextState = workInProgress.memoizedState;
        if ((workInProgress.effectTag & DidCapture) !== NoEffect) {
          // Something suspended. Re-render with the fallback children.
          workInProgress.expirationTime = renderExpirationTime;
          // Do not reset the effect list.
          return workInProgress;
        }

        var nextDidTimeout = nextState !== null;
        var prevDidTimeout = current !== null && current.memoizedState !== null;

        if (current !== null && !nextDidTimeout && prevDidTimeout) {
          // We just switched from the fallback to the normal children. Delete
          // the fallback.
          // TODO: Would it be better to store the fallback fragment on
          var currentFallbackChild = current.child.sibling;
          if (currentFallbackChild !== null) {
            // Deletions go at the beginning of the return fiber's effect list
            var first = workInProgress.firstEffect;
            if (first !== null) {
              workInProgress.firstEffect = currentFallbackChild;
              currentFallbackChild.nextEffect = first;
            } else {
              workInProgress.firstEffect = workInProgress.lastEffect = currentFallbackChild;
              currentFallbackChild.nextEffect = null;
            }
            currentFallbackChild.effectTag = Deletion;
          }
        }

        if (nextDidTimeout || prevDidTimeout) {
          // If the children are hidden, or if they were previous hidden, schedule
          // an effect to toggle their visibility. This is also used to attach a
          // retry listener to the promise.
          workInProgress.effectTag |= Update;
        }
        break;
      }
    case Fragment:
      break;
    case Mode:
      break;
    case Profiler:
      break;
    case HostPortal:
      popHostContainer(workInProgress);
      updateHostContainer(workInProgress);
      break;
    case ContextProvider:
      // Pop provider fiber
      popProvider(workInProgress);
      break;
    case ContextConsumer:
      break;
    case MemoComponent:
      break;
    case IncompleteClassComponent:
      {
        // Same as class component case. I put it down here so that the tags are
        // sequential to ensure this switch is compiled to a jump table.
        var _Component = workInProgress.type;
        if (isContextProvider(_Component)) {
          popContext(workInProgress);
        }
        break;
      }
    case DehydratedSuspenseComponent:
      {
        if (enableSuspenseServerRenderer) {
          if (current === null) {
            var _wasHydrated2 = popHydrationState(workInProgress);
            !_wasHydrated2 ? reactProdInvariant('318') : void 0;
            skipPastDehydratedSuspenseInstance(workInProgress);
          } else if ((workInProgress.effectTag & DidCapture) === NoEffect) {
            // This boundary did not suspend so it's now hydrated.
            // To handle any future suspense cases, we're going to now upgrade it
            // to a Suspense component. We detach it from the existing current fiber.
            current.alternate = null;
            workInProgress.alternate = null;
            workInProgress.tag = SuspenseComponent;
            workInProgress.memoizedState = null;
            workInProgress.stateNode = null;
          }
        }
        break;
      }
    default:
      reactProdInvariant('156');
  }

  return null;
}

function shouldCaptureSuspense(workInProgress) {
  // In order to capture, the Suspense component must have a fallback prop.
  if (workInProgress.memoizedProps.fallback === undefined) {
    return false;
  }
  // If it was the primary children that just suspended, capture and render the
  // fallback. Otherwise, don't capture and bubble to the next boundary.
  var nextState = workInProgress.memoizedState;
  return nextState === null;
}

// This module is forked in different environments.
// By default, return `true` to log errors to the console.
// Forks can return `false` if this isn't desirable.
function showErrorDialog(capturedError) {
  return true;
}

function logCapturedError(capturedError) {
  var logError = showErrorDialog(capturedError);

  // Allow injected showErrorDialog() to prevent default console.error logging.
  // This enables renderers like ReactNative to better manage redbox behavior.
  if (logError === false) {
    return;
  }

  var error = capturedError.error;
  {
    // In production, we print the error directly.
    // This will include the message, the JS stack, and anything the browser wants to show.
    // We pass the error object instead of custom message so that the browser displays the error natively.
    console.error(error);
  }
}

var PossiblyWeakSet$1 = typeof WeakSet === 'function' ? WeakSet : Set;

function logError(boundary, errorInfo) {
  var source = errorInfo.source;
  var stack = errorInfo.stack;
  if (stack === null && source !== null) {
    stack = getStackByFiberInDevAndProd(source);
  }

  var capturedError = {
    componentName: source !== null ? getComponentName(source.type) : null,
    componentStack: stack !== null ? stack : '',
    error: errorInfo.value,
    errorBoundary: null,
    errorBoundaryName: null,
    errorBoundaryFound: false,
    willRetry: false
  };

  if (boundary !== null && boundary.tag === ClassComponent) {
    capturedError.errorBoundary = boundary.stateNode;
    capturedError.errorBoundaryName = getComponentName(boundary.type);
    capturedError.errorBoundaryFound = true;
    capturedError.willRetry = true;
  }

  try {
    logCapturedError(capturedError);
  } catch (e) {
    // This method must not throw, or React internal state will get messed up.
    // If console.error is overridden, or logCapturedError() shows a dialog that throws,
    // we want to report this error outside of the normal stack as a last resort.
    // https://github.com/facebook/react/issues/13188
    setTimeout(function () {
      throw e;
    });
  }
}

var callComponentWillUnmountWithTimer = function (current$$1, instance) {
  startPhaseTimer(current$$1, 'componentWillUnmount');
  instance.props = current$$1.memoizedProps;
  instance.state = current$$1.memoizedState;
  instance.componentWillUnmount();
  stopPhaseTimer();
};

// Capture errors so they don't interrupt unmounting.
function safelyCallComponentWillUnmount(current$$1, instance) {
  {
    try {
      callComponentWillUnmountWithTimer(current$$1, instance);
    } catch (unmountError) {
      captureCommitPhaseError(current$$1, unmountError);
    }
  }
}

function safelyDetachRef(current$$1) {
  var ref = current$$1.ref;
  if (ref !== null) {
    if (typeof ref === 'function') {
      {
        try {
          ref(null);
        } catch (refError) {
          captureCommitPhaseError(current$$1, refError);
        }
      }
    } else {
      ref.current = null;
    }
  }
}

function safelyCallDestroy(current$$1, destroy) {
  {
    try {
      destroy();
    } catch (error) {
      captureCommitPhaseError(current$$1, error);
    }
  }
}

function commitBeforeMutationLifeCycles(current$$1, finishedWork) {
  switch (finishedWork.tag) {
    case FunctionComponent:
    case ForwardRef:
    case SimpleMemoComponent:
      {
        commitHookEffectList(UnmountSnapshot, NoEffect$1, finishedWork);
        return;
      }
    case ClassComponent:
      {
        if (finishedWork.effectTag & Snapshot) {
          if (current$$1 !== null) {
            var prevProps = current$$1.memoizedProps;
            var prevState = current$$1.memoizedState;
            startPhaseTimer(finishedWork, 'getSnapshotBeforeUpdate');
            var instance = finishedWork.stateNode;
            // We could update instance props and state here,
            // but instead we rely on them being set during last render.
            // TODO: revisit this when we implement resuming.
            var snapshot = instance.getSnapshotBeforeUpdate(finishedWork.elementType === finishedWork.type ? prevProps : resolveDefaultProps(finishedWork.type, prevProps), prevState);
            instance.__reactInternalSnapshotBeforeUpdate = snapshot;
            stopPhaseTimer();
          }
        }
        return;
      }
    case HostRoot:
    case HostComponent:
    case HostText:
    case HostPortal:
    case IncompleteClassComponent:
      // Nothing to do for these component types
      return;
    default:
      {
        reactProdInvariant('163');
      }
  }
}

function commitHookEffectList(unmountTag, mountTag, finishedWork) {
  var updateQueue = finishedWork.updateQueue;
  var lastEffect = updateQueue !== null ? updateQueue.lastEffect : null;
  if (lastEffect !== null) {
    var firstEffect = lastEffect.next;
    var effect = firstEffect;
    do {
      if ((effect.tag & unmountTag) !== NoEffect$1) {
        // Unmount
        var destroy = effect.destroy;
        effect.destroy = undefined;
        if (destroy !== undefined) {
          destroy();
        }
      }
      if ((effect.tag & mountTag) !== NoEffect$1) {
        // Mount
        var create = effect.create;
        effect.destroy = create();

        
      }
      effect = effect.next;
    } while (effect !== firstEffect);
  }
}

function commitPassiveHookEffects(finishedWork) {
  commitHookEffectList(UnmountPassive, NoEffect$1, finishedWork);
  commitHookEffectList(NoEffect$1, MountPassive, finishedWork);
}

function commitLifeCycles(finishedRoot, current$$1, finishedWork, committedExpirationTime) {
  switch (finishedWork.tag) {
    case FunctionComponent:
    case ForwardRef:
    case SimpleMemoComponent:
      {
        commitHookEffectList(UnmountLayout, MountLayout, finishedWork);
        break;
      }
    case ClassComponent:
      {
        var instance = finishedWork.stateNode;
        if (finishedWork.effectTag & Update) {
          if (current$$1 === null) {
            startPhaseTimer(finishedWork, 'componentDidMount');
            // We could update instance props and state here,
            // but instead we rely on them being set during last render.
            // TODO: revisit this when we implement resuming.
            instance.componentDidMount();
            stopPhaseTimer();
          } else {
            var prevProps = finishedWork.elementType === finishedWork.type ? current$$1.memoizedProps : resolveDefaultProps(finishedWork.type, current$$1.memoizedProps);
            var prevState = current$$1.memoizedState;
            startPhaseTimer(finishedWork, 'componentDidUpdate');
            // We could update instance props and state here,
            // but instead we rely on them being set during last render.
            // TODO: revisit this when we implement resuming.
            instance.componentDidUpdate(prevProps, prevState, instance.__reactInternalSnapshotBeforeUpdate);
            stopPhaseTimer();
          }
        }
        var updateQueue = finishedWork.updateQueue;
        if (updateQueue !== null) {
          commitUpdateQueue(finishedWork, updateQueue, instance, committedExpirationTime);
        }
        return;
      }
    case HostRoot:
      {
        var _updateQueue = finishedWork.updateQueue;
        if (_updateQueue !== null) {
          var _instance = null;
          if (finishedWork.child !== null) {
            switch (finishedWork.child.tag) {
              case HostComponent:
                _instance = getPublicInstance(finishedWork.child.stateNode);
                break;
              case ClassComponent:
                _instance = finishedWork.child.stateNode;
                break;
            }
          }
          commitUpdateQueue(finishedWork, _updateQueue, _instance, committedExpirationTime);
        }
        return;
      }
    case HostComponent:
      {
        var _instance2 = finishedWork.stateNode;

        // Renderers may schedule work to be done after host components are mounted
        // (eg DOM renderer may schedule auto-focus for inputs and form controls).
        // These effects should only be committed when components are first mounted,
        // aka when there is no current/alternate.
        if (current$$1 === null && finishedWork.effectTag & Update) {
          var type = finishedWork.type;
          var props = finishedWork.memoizedProps;
          
        }

        return;
      }
    case HostText:
      {
        // We have no life-cycles associated with text.
        return;
      }
    case HostPortal:
      {
        // We have no life-cycles associated with portals.
        return;
      }
    case Profiler:
      {
        if (enableProfilerTimer) {
          var onRender = finishedWork.memoizedProps.onRender;

          if (enableSchedulerTracing) {
            onRender(finishedWork.memoizedProps.id, current$$1 === null ? 'mount' : 'update', finishedWork.actualDuration, finishedWork.treeBaseDuration, finishedWork.actualStartTime, getCommitTime(), finishedRoot.memoizedInteractions);
          } else {
            onRender(finishedWork.memoizedProps.id, current$$1 === null ? 'mount' : 'update', finishedWork.actualDuration, finishedWork.treeBaseDuration, finishedWork.actualStartTime, getCommitTime());
          }
        }
        return;
      }
    case SuspenseComponent:
      break;
    case IncompleteClassComponent:
      break;
    default:
      {
        reactProdInvariant('163');
      }
  }
}

function hideOrUnhideAllChildren(finishedWork, isHidden) {
  if (supportsMutation) {
    // We only have the top Fiber that was inserted but we need to recurse down its
    var node = finishedWork;
    while (true) {
      if (node.tag === HostComponent) {
        var instance = node.stateNode;
        if (isHidden) {
          hideInstance(instance);
        } else {
          unhideInstance(node.stateNode, node.memoizedProps);
        }
      } else if (node.tag === HostText) {
        var _instance3 = node.stateNode;
        if (isHidden) {
          hideTextInstance(_instance3);
        } else {
          unhideTextInstance(_instance3, node.memoizedProps);
        }
      } else if (node.tag === SuspenseComponent && node.memoizedState !== null) {
        // Found a nested Suspense component that timed out. Skip over the
        var fallbackChildFragment = node.child.sibling;
        fallbackChildFragment.return = node;
        node = fallbackChildFragment;
        continue;
      } else if (node.child !== null) {
        node.child.return = node;
        node = node.child;
        continue;
      }
      if (node === finishedWork) {
        return;
      }
      while (node.sibling === null) {
        if (node.return === null || node.return === finishedWork) {
          return;
        }
        node = node.return;
      }
      node.sibling.return = node.return;
      node = node.sibling;
    }
  }
}

function commitAttachRef(finishedWork) {
  var ref = finishedWork.ref;
  if (ref !== null) {
    var instance = finishedWork.stateNode;
    var instanceToUse = void 0;
    switch (finishedWork.tag) {
      case HostComponent:
        instanceToUse = getPublicInstance(instance);
        break;
      default:
        instanceToUse = instance;
    }
    if (typeof ref === 'function') {
      ref(instanceToUse);
    } else {
      ref.current = instanceToUse;
    }
  }
}

function commitDetachRef(current$$1) {
  var currentRef = current$$1.ref;
  if (currentRef !== null) {
    if (typeof currentRef === 'function') {
      currentRef(null);
    } else {
      currentRef.current = null;
    }
  }
}

// User-originating errors (lifecycles and refs) should not interrupt
// deletion, so don't let them throw. Host-originating errors should
// interrupt deletion, so it's okay
function commitUnmount(current$$1) {
  onCommitUnmount(current$$1);

  switch (current$$1.tag) {
    case FunctionComponent:
    case ForwardRef:
    case MemoComponent:
    case SimpleMemoComponent:
      {
        var updateQueue = current$$1.updateQueue;
        if (updateQueue !== null) {
          var lastEffect = updateQueue.lastEffect;
          if (lastEffect !== null) {
            var firstEffect = lastEffect.next;
            var effect = firstEffect;
            do {
              var destroy = effect.destroy;
              if (destroy !== undefined) {
                safelyCallDestroy(current$$1, destroy);
              }
              effect = effect.next;
            } while (effect !== firstEffect);
          }
        }
        break;
      }
    case ClassComponent:
      {
        safelyDetachRef(current$$1);
        var instance = current$$1.stateNode;
        if (typeof instance.componentWillUnmount === 'function') {
          safelyCallComponentWillUnmount(current$$1, instance);
        }
        return;
      }
    case HostComponent:
      {
        safelyDetachRef(current$$1);
        return;
      }
    case HostPortal:
      {
        // TODO: this is recursive.
        // We are also not using this parent because
        // the portal will get pushed immediately.
        if (supportsMutation) {
          unmountHostComponents(current$$1);
        } else if (supportsPersistence) {
          emptyPortalContainer(current$$1);
        }
        return;
      }
  }
}

function commitNestedUnmounts(root) {
  // While we're inside a removed host node we don't want to call
  // removeChild on the inner nodes because they're removed by the top
  // call anyway. We also want to call componentWillUnmount on all
  // composites before this host node is removed from the tree. Therefore
  var node = root;
  while (true) {
    commitUnmount(node);
    // Visit children because they may contain more composite or host nodes.
    // Skip portals because commitUnmount() currently visits them recursively.
    if (node.child !== null && (
    // If we use mutation we drill down into portals using commitUnmount above.
    // If we don't use mutation we drill down into portals here instead.
    !supportsMutation || node.tag !== HostPortal)) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    if (node === root) {
      return;
    }
    while (node.sibling === null) {
      if (node.return === null || node.return === root) {
        return;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
}

function detachFiber(current$$1) {
  // Cut off the return pointers to disconnect it from the tree. Ideally, we
  // should clear the child pointer of the parent alternate to let this
  // get GC:ed but we don't know which for sure which parent is the current
  // one so we'll settle for GC:ing the subtree of this child. This child
  // itself will be GC:ed when the parent updates the next time.
  current$$1.return = null;
  current$$1.child = null;
  current$$1.memoizedState = null;
  current$$1.updateQueue = null;
  var alternate = current$$1.alternate;
  if (alternate !== null) {
    alternate.return = null;
    alternate.child = null;
    alternate.memoizedState = null;
    alternate.updateQueue = null;
  }
}

function emptyPortalContainer(current$$1) {
  if (!supportsPersistence) {
    return;
  }

  var portal = current$$1.stateNode;
  var containerInfo = portal.containerInfo;

  var emptyChildSet = createContainerChildSet(containerInfo);
  replaceContainerChildren(containerInfo, emptyChildSet);
}

function commitContainer(finishedWork) {
  if (!supportsPersistence) {
    return;
  }

  switch (finishedWork.tag) {
    case ClassComponent:
      {
        return;
      }
    case HostComponent:
      {
        return;
      }
    case HostText:
      {
        return;
      }
    case HostRoot:
    case HostPortal:
      {
        var portalOrRoot = finishedWork.stateNode;
        var containerInfo = portalOrRoot.containerInfo,
            _pendingChildren = portalOrRoot.pendingChildren;

        replaceContainerChildren(containerInfo, _pendingChildren);
        return;
      }
    default:
      {
        reactProdInvariant('163');
      }
  }
}

function getHostParentFiber(fiber) {
  var parent = fiber.return;
  while (parent !== null) {
    if (isHostParent(parent)) {
      return parent;
    }
    parent = parent.return;
  }
  reactProdInvariant('160');
}

function isHostParent(fiber) {
  return fiber.tag === HostComponent || fiber.tag === HostRoot || fiber.tag === HostPortal;
}

function getHostSibling(fiber) {
  // We're going to search forward into the tree until we find a sibling host
  // node. Unfortunately, if multiple insertions are done in a row we have to
  // search past them. This leads to exponential search for the next sibling.
  var node = fiber;
  siblings: while (true) {
    // If we didn't find anything, let's try the next sibling.
    while (node.sibling === null) {
      if (node.return === null || isHostParent(node.return)) {
        // If we pop out of the root or hit the parent the fiber we are the
        // last sibling.
        return null;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
    while (node.tag !== HostComponent && node.tag !== HostText && node.tag !== DehydratedSuspenseComponent) {
      // If it is not host node and, we might have a host node inside it.
      // Try to search down until we find one.
      if (node.effectTag & Placement) {
        // If we don't have a child, try the siblings instead.
        continue siblings;
      }
      // If we don't have a child, try the siblings instead.
      // We also skip portals because they are not part of this host tree.
      if (node.child === null || node.tag === HostPortal) {
        continue siblings;
      } else {
        node.child.return = node;
        node = node.child;
      }
    }
    // Check if this host node is stable or about to be placed.
    if (!(node.effectTag & Placement)) {
      // Found it!
      return node.stateNode;
    }
  }
}

function commitPlacement(finishedWork) {
  if (!supportsMutation) {
    return;
  }

  // Recursively insert all host nodes into the parent.
  var parentFiber = getHostParentFiber(finishedWork);

  // Note: these two variables *must* always be updated together.
  var parent = void 0;
  var isContainer = void 0;

  switch (parentFiber.tag) {
    case HostComponent:
      parent = parentFiber.stateNode;
      isContainer = false;
      break;
    case HostRoot:
      parent = parentFiber.stateNode.containerInfo;
      isContainer = true;
      break;
    case HostPortal:
      parent = parentFiber.stateNode.containerInfo;
      isContainer = true;
      break;
    default:
      reactProdInvariant('161');
  }
  if (parentFiber.effectTag & ContentReset) {
    // Reset the text content of the parent before doing any insertions
    parentFiber.effectTag &= ~ContentReset;
  }

  var before = getHostSibling(finishedWork);
  // We only have the top Fiber that was inserted but we need to recurse down its
  // children to find all the terminal nodes.
  var node = finishedWork;
  while (true) {
    if (node.tag === HostComponent || node.tag === HostText) {
      if (before) {
        if (isContainer) {
          insertInContainerBefore(parent, node.stateNode, before);
        } else {
          insertBefore(parent, node.stateNode, before);
        }
      } else {
        if (isContainer) {
          appendChildToContainer(parent, node.stateNode);
        } else {
          appendChild(parent, node.stateNode);
        }
      }
    } else if (node.tag === HostPortal) {
      // If the insertion itself is a portal, then we don't want to traverse
      // down its children. Instead, we'll get insertions from each child in
      // the portal directly.
    } else if (node.child !== null) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    if (node === finishedWork) {
      return;
    }
    while (node.sibling === null) {
      if (node.return === null || node.return === finishedWork) {
        return;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
}

function unmountHostComponents(current$$1) {
  // We only have the top Fiber that was deleted but we need to recurse down its
  var node = current$$1;

  // Each iteration, currentParent is populated with node's host parent if not
  // currentParentIsValid.
  var currentParentIsValid = false;

  // Note: these two variables *must* always be updated together.
  var currentParent = void 0;
  var currentParentIsContainer = void 0;

  while (true) {
    if (!currentParentIsValid) {
      var parent = node.return;
      findParent: while (true) {
        !(parent !== null) ? reactProdInvariant('160') : void 0;
        switch (parent.tag) {
          case HostComponent:
            currentParent = parent.stateNode;
            currentParentIsContainer = false;
            break findParent;
          case HostRoot:
            currentParent = parent.stateNode.containerInfo;
            currentParentIsContainer = true;
            break findParent;
          case HostPortal:
            currentParent = parent.stateNode.containerInfo;
            currentParentIsContainer = true;
            break findParent;
        }
        parent = parent.return;
      }
      currentParentIsValid = true;
    }

    if (node.tag === HostComponent || node.tag === HostText) {
      commitNestedUnmounts(node);
      // After all the children have unmounted, it is now safe to remove the
      // node from the tree.
      if (currentParentIsContainer) {
        removeChildFromContainer(currentParent, node.stateNode);
      } else {
        removeChild(currentParent, node.stateNode);
      }
      // Don't visit children because we already visited them.
    } else if (enableSuspenseServerRenderer && node.tag === DehydratedSuspenseComponent) {
      // Delete the dehydrated suspense boundary and all of its content.
      if (currentParentIsContainer) {
        clearSuspenseBoundaryFromContainer(currentParent, node.stateNode);
      } else {
        clearSuspenseBoundary(currentParent, node.stateNode);
      }
    } else if (node.tag === HostPortal) {
      if (node.child !== null) {
        // When we go into a portal, it becomes the parent to remove from.
        // We will reassign it back when we pop the portal on the way up.
        currentParent = node.stateNode.containerInfo;
        currentParentIsContainer = true;
        // Visit children because portals might contain host components.
        node.child.return = node;
        node = node.child;
        continue;
      }
    } else {
      commitUnmount(node);
      // Visit children because we may find more host components below.
      if (node.child !== null) {
        node.child.return = node;
        node = node.child;
        continue;
      }
    }
    if (node === current$$1) {
      return;
    }
    while (node.sibling === null) {
      if (node.return === null || node.return === current$$1) {
        return;
      }
      node = node.return;
      if (node.tag === HostPortal) {
        // When we go out of the portal, we need to restore the parent.
        // Since we don't keep a stack of them, we will search for it.
        currentParentIsValid = false;
      }
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
}

function commitDeletion(current$$1) {
  if (supportsMutation) {
    // Recursively delete all host nodes from the parent.
    // Detach refs and call componentWillUnmount() on the whole subtree.
    unmountHostComponents(current$$1);
  } else {
    // Detach refs and call componentWillUnmount() on the whole subtree.
    commitNestedUnmounts(current$$1);
  }
  detachFiber(current$$1);
}

function commitWork(current$$1, finishedWork) {
  if (!supportsMutation) {
    switch (finishedWork.tag) {
      case FunctionComponent:
      case ForwardRef:
      case MemoComponent:
      case SimpleMemoComponent:
        {
          // Note: We currently never use MountMutation, but useLayout uses
          // UnmountMutation.
          commitHookEffectList(UnmountMutation, MountMutation, finishedWork);
          return;
        }
    }

    commitContainer(finishedWork);
    return;
  }

  switch (finishedWork.tag) {
    case FunctionComponent:
    case ForwardRef:
    case MemoComponent:
    case SimpleMemoComponent:
      {
        // Note: We currently never use MountMutation, but useLayout uses
        // UnmountMutation.
        commitHookEffectList(UnmountMutation, MountMutation, finishedWork);
        return;
      }
    case ClassComponent:
      {
        return;
      }
    case HostComponent:
      {
        var instance = finishedWork.stateNode;
        if (instance != null) {
          // Commit the work prepared earlier.
          var newProps = finishedWork.memoizedProps;
          // For hydration we reuse the update path but we treat the oldProps
          // as the newProps. The updatePayload will contain the real change in
          // this case.
          var oldProps = current$$1 !== null ? current$$1.memoizedProps : newProps;
          var type = finishedWork.type;
          // TODO: Type the updateQueue to be specific to host components.
          var updatePayload = finishedWork.updateQueue;
          finishedWork.updateQueue = null;
          if (updatePayload !== null) {
            commitUpdate(instance, updatePayload, type, oldProps, newProps, finishedWork);
          }
        }
        return;
      }
    case HostText:
      {
        !(finishedWork.stateNode !== null) ? reactProdInvariant('162') : void 0;
        var textInstance = finishedWork.stateNode;
        var newText = finishedWork.memoizedProps;
        // For hydration we reuse the update path but we treat the oldProps
        // as the newProps. The updatePayload will contain the real change in
        // this case.
        var oldText = current$$1 !== null ? current$$1.memoizedProps : newText;
        commitTextUpdate(textInstance, oldText, newText);
        return;
      }
    case HostRoot:
      {
        return;
      }
    case Profiler:
      {
        return;
      }
    case SuspenseComponent:
      {
        var newState = finishedWork.memoizedState;

        var newDidTimeout = void 0;
        var primaryChildParent = finishedWork;
        if (newState === null) {
          newDidTimeout = false;
        } else {
          newDidTimeout = true;
          primaryChildParent = finishedWork.child;
          if (newState.timedOutAt === NoWork) {
            // If the children had not already timed out, record the time.
            // This is used to compute the elapsed time during subsequent
            // attempts to render the children.
            newState.timedOutAt = requestCurrentTime();
          }
        }

        if (primaryChildParent !== null) {
          hideOrUnhideAllChildren(primaryChildParent, newDidTimeout);
        }

        // If this boundary just timed out, then it will have a set of thenables.
        // For each thenable, attach a listener so that when it resolves, React
        // attempts to re-render the boundary in the primary (pre-timeout) state.
        var thenables = finishedWork.updateQueue;
        if (thenables !== null) {
          finishedWork.updateQueue = null;
          var retryCache = finishedWork.stateNode;
          if (retryCache === null) {
            retryCache = finishedWork.stateNode = new PossiblyWeakSet$1();
          }
          thenables.forEach(function (thenable) {
            // Memoize using the boundary fiber to prevent redundant listeners.
            var retry = retryTimedOutBoundary.bind(null, finishedWork, thenable);
            if (enableSchedulerTracing) {
              retry = unstable_wrap(retry);
            }
            if (!retryCache.has(thenable)) {
              retryCache.add(thenable);
              thenable.then(retry, retry);
            }
          });
        }

        return;
      }
    case IncompleteClassComponent:
      {
        return;
      }
    default:
      {
        reactProdInvariant('163');
      }
  }
}

function commitResetTextContent(current$$1) {
  if (!supportsMutation) {
    return;
  }
  resetTextContent(current$$1.stateNode);
}

var PossiblyWeakSet = typeof WeakSet === 'function' ? WeakSet : Set;
var PossiblyWeakMap = typeof WeakMap === 'function' ? WeakMap : Map;

function createRootErrorUpdate(fiber, errorInfo, expirationTime) {
  var update = createUpdate(expirationTime);
  // Unmount the root by rendering null.
  update.tag = CaptureUpdate;
  // Caution: React DevTools currently depends on this property
  // being called "element".
  update.payload = { element: null };
  var error = errorInfo.value;
  update.callback = function () {
    onUncaughtError(error);
    logError(fiber, errorInfo);
  };
  return update;
}

function createClassErrorUpdate(fiber, errorInfo, expirationTime) {
  var update = createUpdate(expirationTime);
  update.tag = CaptureUpdate;
  var getDerivedStateFromError = fiber.type.getDerivedStateFromError;
  if (typeof getDerivedStateFromError === 'function') {
    var error = errorInfo.value;
    update.payload = function () {
      return getDerivedStateFromError(error);
    };
  }

  var inst = fiber.stateNode;
  if (inst !== null && typeof inst.componentDidCatch === 'function') {
    update.callback = function callback() {
      if (typeof getDerivedStateFromError !== 'function') {
        // To preserve the preexisting retry behavior of error boundaries,
        // we keep track of which ones already failed during this batch.
        // This gets reset before we yield back to the browser.
        // TODO: Warn in strict mode if getDerivedStateFromError is
        // not defined.
        markLegacyErrorBoundaryAsFailed(this);
      }
      var error = errorInfo.value;
      var stack = errorInfo.stack;
      logError(fiber, errorInfo);
      this.componentDidCatch(error, {
        componentStack: stack !== null ? stack : ''
      });
      
    };
  }
  return update;
}

function attachPingListener(root, renderExpirationTime, thenable) {
  // Attach a listener to the promise to "ping" the root and retry. But
  // only if one does not already exist for the current render expiration
  // time (which acts like a "thread ID" here).
  var pingCache = root.pingCache;
  var threadIDs = void 0;
  if (pingCache === null) {
    pingCache = root.pingCache = new PossiblyWeakMap();
    threadIDs = new Set();
    pingCache.set(thenable, threadIDs);
  } else {
    threadIDs = pingCache.get(thenable);
    if (threadIDs === undefined) {
      threadIDs = new Set();
      pingCache.set(thenable, threadIDs);
    }
  }
  if (!threadIDs.has(renderExpirationTime)) {
    // Memoize using the thread ID to prevent redundant listeners.
    threadIDs.add(renderExpirationTime);
    var ping = pingSuspendedRoot.bind(null, root, thenable, renderExpirationTime);
    if (enableSchedulerTracing) {
      ping = unstable_wrap(ping);
    }
    thenable.then(ping, ping);
  }
}

function throwException(root, returnFiber, sourceFiber, value, renderExpirationTime) {
  // The source fiber did not complete.
  sourceFiber.effectTag |= Incomplete;
  // Its effect list is no longer valid.
  sourceFiber.firstEffect = sourceFiber.lastEffect = null;

  if (value !== null && typeof value === 'object' && typeof value.then === 'function') {
    // This is a thenable.
    var thenable = value;

    // Find the earliest timeout threshold of all the placeholders in the
    // ancestor path. We could avoid this traversal by storing the thresholds on
    // the stack, but we choose not to because we only hit this path if we're
    // IO-bound (i.e. if something suspends). Whereas the stack is used even in
    // the non-IO- bound case.
    var _workInProgress = returnFiber;
    var earliestTimeoutMs = -1;
    var startTimeMs = -1;
    do {
      if (_workInProgress.tag === SuspenseComponent) {
        var current$$1 = _workInProgress.alternate;
        if (current$$1 !== null) {
          var currentState = current$$1.memoizedState;
          if (currentState !== null) {
            // Reached a boundary that already timed out. Do not search
            // any further.
            var timedOutAt = currentState.timedOutAt;
            startTimeMs = expirationTimeToMs(timedOutAt);
            // Do not search any further.
            break;
          }
        }
        var timeoutPropMs = _workInProgress.pendingProps.maxDuration;
        if (typeof timeoutPropMs === 'number') {
          if (timeoutPropMs <= 0) {
            earliestTimeoutMs = 0;
          } else if (earliestTimeoutMs === -1 || timeoutPropMs < earliestTimeoutMs) {
            earliestTimeoutMs = timeoutPropMs;
          }
        }
      }
      // If there is a DehydratedSuspenseComponent we don't have to do anything because
      // if something suspends inside it, we will simply leave that as dehydrated. It
      // will never timeout.
      _workInProgress = _workInProgress.return;
    } while (_workInProgress !== null);

    // Schedule the nearest Suspense to re-render the timed out view.
    _workInProgress = returnFiber;
    do {
      if (_workInProgress.tag === SuspenseComponent && shouldCaptureSuspense(_workInProgress)) {
        // Found the nearest boundary.

        // Stash the promise on the boundary fiber. If the boundary times out, we'll
        var thenables = _workInProgress.updateQueue;
        if (thenables === null) {
          var updateQueue = new Set();
          updateQueue.add(thenable);
          _workInProgress.updateQueue = updateQueue;
        } else {
          thenables.add(thenable);
        }

        // If the boundary is outside of concurrent mode, we should *not*
        // suspend the commit. Pretend as if the suspended component rendered
        // null and keep rendering. In the commit phase, we'll schedule a
        // subsequent synchronous update to re-render the Suspense.
        //
        // Note: It doesn't matter whether the component that suspended was
        // inside a concurrent mode tree. If the Suspense is outside of it, we
        // should *not* suspend the commit.
        if ((_workInProgress.mode & ConcurrentMode) === NoEffect) {
          _workInProgress.effectTag |= DidCapture;

          // We're going to commit this fiber even though it didn't complete.
          // But we shouldn't call any lifecycle methods or callbacks. Remove
          // all lifecycle effect tags.
          sourceFiber.effectTag &= ~(LifecycleEffectMask | Incomplete);

          if (sourceFiber.tag === ClassComponent) {
            var currentSourceFiber = sourceFiber.alternate;
            if (currentSourceFiber === null) {
              // This is a new mount. Change the tag so it's not mistaken for a
              // completed class component. For example, we should not call
              // componentWillUnmount if it is deleted.
              sourceFiber.tag = IncompleteClassComponent;
            } else {
              // When we try rendering again, we should not reuse the current fiber,
              // since it's known to be in an inconsistent state. Use a force updte to
              // prevent a bail out.
              var update = createUpdate(Sync);
              update.tag = ForceUpdate;
              enqueueUpdate(sourceFiber, update);
            }
          }

          // The source fiber did not complete. Mark it with Sync priority to
          // indicate that it still has pending work.
          sourceFiber.expirationTime = Sync;

          // Exit without suspending.
          return;
        }

        // Confirmed that the boundary is in a concurrent mode tree. Continue
        // with the normal suspend path.

        attachPingListener(root, renderExpirationTime, thenable);

        var absoluteTimeoutMs = void 0;
        if (earliestTimeoutMs === -1) {
          // If no explicit threshold is given, default to an arbitrarily large
          // value. The actual size doesn't matter because the threshold for the
          // whole tree will be clamped to the expiration time.
          absoluteTimeoutMs = maxSigned31BitInt;
        } else {
          if (startTimeMs === -1) {
            // This suspend happened outside of any already timed-out
            // placeholders. We don't know exactly when the update was
            // scheduled, but we can infer an approximate start time from the
            // expiration time. First, find the earliest uncommitted expiration
            // time in the tree, including work that is suspended. Then subtract
            // the offset used to compute an async update's expiration time.
            // This will cause high priority (interactive) work to expire
            // earlier than necessary, but we can account for this by adjusting
            // for the Just Noticeable Difference.
            var earliestExpirationTime = findEarliestOutstandingPriorityLevel(root, renderExpirationTime);
            var earliestExpirationTimeMs = expirationTimeToMs(earliestExpirationTime);
            startTimeMs = earliestExpirationTimeMs - LOW_PRIORITY_EXPIRATION;
          }
          absoluteTimeoutMs = startTimeMs + earliestTimeoutMs;
        }

        // Mark the earliest timeout in the suspended fiber's ancestor path.
        // After completing the root, we'll take the largest of all the
        // suspended fiber's timeouts and use it to compute a timeout for the
        // whole tree.
        renderDidSuspend(root, absoluteTimeoutMs, renderExpirationTime);

        _workInProgress.effectTag |= ShouldCapture;
        _workInProgress.expirationTime = renderExpirationTime;
        return;
      } else if (enableSuspenseServerRenderer && _workInProgress.tag === DehydratedSuspenseComponent) {
        attachPingListener(root, renderExpirationTime, thenable);

        // Since we already have a current fiber, we can eagerly add a retry listener.
        var retryCache = _workInProgress.memoizedState;
        if (retryCache === null) {
          retryCache = _workInProgress.memoizedState = new PossiblyWeakSet();
          var _current = _workInProgress.alternate;
          !_current ? reactProdInvariant('319') : void 0;
          _current.memoizedState = retryCache;
        }
        // Memoize using the boundary fiber to prevent redundant listeners.
        if (!retryCache.has(thenable)) {
          retryCache.add(thenable);
          var retry = retryTimedOutBoundary.bind(null, _workInProgress, thenable);
          if (enableSchedulerTracing) {
            retry = unstable_wrap(retry);
          }
          thenable.then(retry, retry);
        }
        _workInProgress.effectTag |= ShouldCapture;
        _workInProgress.expirationTime = renderExpirationTime;
        return;
      }
      // This boundary already captured during this render. Continue to the next
      // boundary.
      _workInProgress = _workInProgress.return;
    } while (_workInProgress !== null);
    // No boundary was found. Fallthrough to error mode.
    // TODO: Use invariant so the message is stripped in prod?
    value = new Error((getComponentName(sourceFiber.type) || 'A React component') + ' suspended while rendering, but no fallback UI was specified.\n' + '\n' + 'Add a <Suspense fallback=...> component higher in the tree to ' + 'provide a loading indicator or placeholder to display.' + getStackByFiberInDevAndProd(sourceFiber));
  }

  // We didn't find a boundary that could handle this type of exception. Start
  // over and traverse parent path again, this time treating the exception
  // as an error.
  renderDidError();
  value = createCapturedValue(value, sourceFiber);
  var workInProgress = returnFiber;
  do {
    switch (workInProgress.tag) {
      case HostRoot:
        {
          var _errorInfo = value;
          workInProgress.effectTag |= ShouldCapture;
          workInProgress.expirationTime = renderExpirationTime;
          var _update = createRootErrorUpdate(workInProgress, _errorInfo, renderExpirationTime);
          enqueueCapturedUpdate(workInProgress, _update);
          return;
        }
      case ClassComponent:
        // Capture and retry
        var errorInfo = value;
        var ctor = workInProgress.type;
        var instance = workInProgress.stateNode;
        if ((workInProgress.effectTag & DidCapture) === NoEffect && (typeof ctor.getDerivedStateFromError === 'function' || instance !== null && typeof instance.componentDidCatch === 'function' && !isAlreadyFailedLegacyErrorBoundary(instance))) {
          workInProgress.effectTag |= ShouldCapture;
          workInProgress.expirationTime = renderExpirationTime;
          // Schedule the error boundary to re-render using updated state
          var _update2 = createClassErrorUpdate(workInProgress, errorInfo, renderExpirationTime);
          enqueueCapturedUpdate(workInProgress, _update2);
          return;
        }
        break;
      default:
        break;
    }
    workInProgress = workInProgress.return;
  } while (workInProgress !== null);
}

function unwindWork(workInProgress, renderExpirationTime) {
  switch (workInProgress.tag) {
    case ClassComponent:
      {
        var Component = workInProgress.type;
        if (isContextProvider(Component)) {
          popContext(workInProgress);
        }
        var effectTag = workInProgress.effectTag;
        if (effectTag & ShouldCapture) {
          workInProgress.effectTag = effectTag & ~ShouldCapture | DidCapture;
          return workInProgress;
        }
        return null;
      }
    case HostRoot:
      {
        popHostContainer(workInProgress);
        popTopLevelContextObject(workInProgress);
        var _effectTag = workInProgress.effectTag;
        !((_effectTag & DidCapture) === NoEffect) ? reactProdInvariant('285') : void 0;
        workInProgress.effectTag = _effectTag & ~ShouldCapture | DidCapture;
        return workInProgress;
      }
    case HostComponent:
      {
        // TODO: popHydrationState
        popHostContext(workInProgress);
        return null;
      }
    case SuspenseComponent:
      {
        var _effectTag2 = workInProgress.effectTag;
        if (_effectTag2 & ShouldCapture) {
          workInProgress.effectTag = _effectTag2 & ~ShouldCapture | DidCapture;
          // Captured a suspense effect. Re-render the boundary.
          return workInProgress;
        }
        return null;
      }
    case DehydratedSuspenseComponent:
      {
        if (enableSuspenseServerRenderer) {
          // TODO: popHydrationState
          var _effectTag3 = workInProgress.effectTag;
          if (_effectTag3 & ShouldCapture) {
            workInProgress.effectTag = _effectTag3 & ~ShouldCapture | DidCapture;
            // Captured a suspense effect. Re-render the boundary.
            return workInProgress;
          }
        }
        return null;
      }
    case HostPortal:
      popHostContainer(workInProgress);
      return null;
    case ContextProvider:
      popProvider(workInProgress);
      return null;
    default:
      return null;
  }
}

function unwindInterruptedWork(interruptedWork) {
  switch (interruptedWork.tag) {
    case ClassComponent:
      {
        var childContextTypes = interruptedWork.type.childContextTypes;
        if (childContextTypes !== null && childContextTypes !== undefined) {
          popContext(interruptedWork);
        }
        break;
      }
    case HostRoot:
      {
        popHostContainer(interruptedWork);
        popTopLevelContextObject(interruptedWork);
        break;
      }
    case HostComponent:
      {
        popHostContext(interruptedWork);
        break;
      }
    case HostPortal:
      popHostContainer(interruptedWork);
      break;
    case ContextProvider:
      popProvider(interruptedWork);
      break;
    default:
      break;
  }
}

var ReactCurrentDispatcher = ReactSharedInternals.ReactCurrentDispatcher;
var ReactCurrentOwner$1 = ReactSharedInternals.ReactCurrentOwner;


if (enableSchedulerTracing) {
  // Provide explicit error message when production+profiling bundle of e.g. react-dom
  // is used with production (non-profiling) bundle of scheduler/tracing
  !(__interactionsRef != null && __interactionsRef.current != null) ? reactProdInvariant('302') : void 0;
}

var isWorking = false;

// The next work in progress fiber that we're currently working on.
var nextUnitOfWork = null;
var nextRoot = null;
// The time at which we're currently rendering work.
var nextRenderExpirationTime = NoWork;
var nextLatestAbsoluteTimeoutMs = -1;
var nextRenderDidError = false;

// The next fiber with an effect that we're currently committing.
var nextEffect = null;

var isCommitting$1 = false;
var rootWithPendingPassiveEffects = null;
var passiveEffectCallbackHandle = null;
var passiveEffectCallback = null;

var legacyErrorBoundariesThatAlreadyFailed = null;

// Used for performance tracking.
var interruptedBy = null;

function resetStack() {
  if (nextUnitOfWork !== null) {
    var interruptedWork = nextUnitOfWork.return;
    while (interruptedWork !== null) {
      unwindInterruptedWork(interruptedWork);
      interruptedWork = interruptedWork.return;
    }
  }

  nextRoot = null;
  nextRenderExpirationTime = NoWork;
  nextLatestAbsoluteTimeoutMs = -1;
  nextRenderDidError = false;
  nextUnitOfWork = null;
}

function commitAllHostEffects() {
  while (nextEffect !== null) {
    recordEffect();

    var effectTag = nextEffect.effectTag;

    if (effectTag & ContentReset) {
      commitResetTextContent(nextEffect);
    }

    if (effectTag & Ref) {
      var current$$1 = nextEffect.alternate;
      if (current$$1 !== null) {
        commitDetachRef(current$$1);
      }
    }

    // The following switch statement is only concerned about placement,
    // updates, and deletions. To avoid needing to add a case for every
    // possible bitmap value, we remove the secondary effects from the
    // effect tag and switch on that value.
    var primaryEffectTag = effectTag & (Placement | Update | Deletion);
    switch (primaryEffectTag) {
      case Placement:
        {
          commitPlacement(nextEffect);
          // Clear the "placement" from effect tag so that we know that this is inserted, before
          // any life-cycles like componentDidMount gets called.
          // TODO: findDOMNode doesn't rely on this any more but isMounted
          // does and isMounted is deprecated anyway so we should be able
          // to kill this.
          nextEffect.effectTag &= ~Placement;
          break;
        }
      case PlacementAndUpdate:
        {
          // Placement
          commitPlacement(nextEffect);
          // Clear the "placement" from effect tag so that we know that this is inserted, before
          // any life-cycles like componentDidMount gets called.
          nextEffect.effectTag &= ~Placement;

          // Update
          var _current = nextEffect.alternate;
          commitWork(_current, nextEffect);
          break;
        }
      case Update:
        {
          var _current2 = nextEffect.alternate;
          commitWork(_current2, nextEffect);
          break;
        }
      case Deletion:
        {
          commitDeletion(nextEffect);
          break;
        }
    }
    nextEffect = nextEffect.nextEffect;
  }

  
}

function commitBeforeMutationLifecycles() {
  while (nextEffect !== null) {
    var effectTag = nextEffect.effectTag;
    if (effectTag & Snapshot) {
      recordEffect();
      var current$$1 = nextEffect.alternate;
      commitBeforeMutationLifeCycles(current$$1, nextEffect);
    }

    nextEffect = nextEffect.nextEffect;
  }

  
}

function commitAllLifeCycles(finishedRoot, committedExpirationTime) {
  while (nextEffect !== null) {
    var effectTag = nextEffect.effectTag;

    if (effectTag & (Update | Callback)) {
      recordEffect();
      var current$$1 = nextEffect.alternate;
      commitLifeCycles(finishedRoot, current$$1, nextEffect, committedExpirationTime);
    }

    if (effectTag & Ref) {
      recordEffect();
      commitAttachRef(nextEffect);
    }

    if (effectTag & Passive) {
      rootWithPendingPassiveEffects = finishedRoot;
    }

    nextEffect = nextEffect.nextEffect;
  }
  
}

function commitPassiveEffects(root, firstEffect) {
  rootWithPendingPassiveEffects = null;
  passiveEffectCallbackHandle = null;
  passiveEffectCallback = null;

  // Set this to true to prevent re-entrancy
  var previousIsRendering = isRendering;
  isRendering = true;

  var effect = firstEffect;
  do {
    if (effect.effectTag & Passive) {
      var didError = false;
      var error = void 0;
      {
        try {
          commitPassiveHookEffects(effect);
        } catch (e) {
          didError = true;
          error = e;
        }
      }
      if (didError) {
        captureCommitPhaseError(effect, error);
      }
    }
    effect = effect.nextEffect;
  } while (effect !== null);
  isRendering = previousIsRendering;

  // Check if work was scheduled by one of the effects
  var rootExpirationTime = root.expirationTime;
  if (rootExpirationTime !== NoWork) {
    requestWork(root, rootExpirationTime);
  }
  // Flush any sync work that was scheduled by effects
  if (!isBatchingUpdates && !isRendering) {
    performSyncWork();
  }
}

function isAlreadyFailedLegacyErrorBoundary(instance) {
  return legacyErrorBoundariesThatAlreadyFailed !== null && legacyErrorBoundariesThatAlreadyFailed.has(instance);
}

function markLegacyErrorBoundaryAsFailed(instance) {
  if (legacyErrorBoundariesThatAlreadyFailed === null) {
    legacyErrorBoundariesThatAlreadyFailed = new Set([instance]);
  } else {
    legacyErrorBoundariesThatAlreadyFailed.add(instance);
  }
}

function flushPassiveEffects$1() {
  if (passiveEffectCallbackHandle !== null) {
    cancelPassiveEffects(passiveEffectCallbackHandle);
  }
  if (passiveEffectCallback !== null) {
    // We call the scheduled callback instead of commitPassiveEffects directly
    // to ensure tracing works correctly.
    passiveEffectCallback();
  }
}

function commitRoot(root, finishedWork) {
  isWorking = true;
  isCommitting$1 = true;
  startCommitTimer();

  !(root.current !== finishedWork) ? reactProdInvariant('177') : void 0;
  var committedExpirationTime = root.pendingCommitExpirationTime;
  !(committedExpirationTime !== NoWork) ? reactProdInvariant('261') : void 0;
  root.pendingCommitExpirationTime = NoWork;

  // Update the pending priority levels to account for the work that we are
  // about to commit. This needs to happen before calling the lifecycles, since
  // they may schedule additional updates.
  var updateExpirationTimeBeforeCommit = finishedWork.expirationTime;
  var childExpirationTimeBeforeCommit = finishedWork.childExpirationTime;
  var earliestRemainingTimeBeforeCommit = childExpirationTimeBeforeCommit > updateExpirationTimeBeforeCommit ? childExpirationTimeBeforeCommit : updateExpirationTimeBeforeCommit;
  markCommittedPriorityLevels(root, earliestRemainingTimeBeforeCommit);

  var prevInteractions = null;
  if (enableSchedulerTracing) {
    // Restore any pending interactions at this point,
    // So that cascading work triggered during the render phase will be accounted for.
    prevInteractions = __interactionsRef.current;
    __interactionsRef.current = root.memoizedInteractions;
  }

  // Reset this to null before calling lifecycles
  ReactCurrentOwner$1.current = null;

  var firstEffect = void 0;
  if (finishedWork.effectTag > PerformedWork) {
    // A fiber's effect list consists only of its children, not itself. So if
    // the root has an effect, we need to add it to the end of the list. The
    // resulting list is the set that would belong to the root's parent, if
    // it had one; that is, all the effects in the tree including the root.
    if (finishedWork.lastEffect !== null) {
      finishedWork.lastEffect.nextEffect = finishedWork;
      firstEffect = finishedWork.firstEffect;
    } else {
      firstEffect = finishedWork;
    }
  } else {
    // There is no effect on the root.
    firstEffect = finishedWork.firstEffect;
  }

  prepareForCommit(root.containerInfo);

  // Invoke instances of getSnapshotBeforeUpdate before mutation.
  nextEffect = firstEffect;
  startCommitSnapshotEffectsTimer();
  while (nextEffect !== null) {
    var didError = false;
    var error = void 0;
    {
      try {
        commitBeforeMutationLifecycles();
      } catch (e) {
        didError = true;
        error = e;
      }
    }
    if (didError) {
      !(nextEffect !== null) ? reactProdInvariant('178') : void 0;
      captureCommitPhaseError(nextEffect, error);
      // Clean-up
      if (nextEffect !== null) {
        nextEffect = nextEffect.nextEffect;
      }
    }
  }
  stopCommitSnapshotEffectsTimer();

  if (enableProfilerTimer) {
    // Mark the current commit time to be shared by all Profilers in this batch.
    // This enables them to be grouped later.
    recordCommitTime();
  }

  // Commit all the side-effects within a tree. We'll do this in two passes.
  // The first pass performs all the host insertions, updates, deletions and
  // ref unmounts.
  nextEffect = firstEffect;
  startCommitHostEffectsTimer();
  while (nextEffect !== null) {
    var _didError = false;
    var _error = void 0;
    {
      try {
        commitAllHostEffects();
      } catch (e) {
        _didError = true;
        _error = e;
      }
    }
    if (_didError) {
      !(nextEffect !== null) ? reactProdInvariant('178') : void 0;
      captureCommitPhaseError(nextEffect, _error);
      // Clean-up
      if (nextEffect !== null) {
        nextEffect = nextEffect.nextEffect;
      }
    }
  }
  stopCommitHostEffectsTimer();

  resetAfterCommit(root.containerInfo);

  // The work-in-progress tree is now the current tree. This must come after
  // the first pass of the commit phase, so that the previous tree is still
  // current during componentWillUnmount, but before the second pass, so that
  // the finished work is current during componentDidMount/Update.
  root.current = finishedWork;

  // In the second pass we'll perform all life-cycles and ref callbacks.
  // Life-cycles happen as a separate pass so that all placements, updates,
  // and deletions in the entire tree have already been invoked.
  // This pass also triggers any renderer-specific initial effects.
  nextEffect = firstEffect;
  startCommitLifeCyclesTimer();
  while (nextEffect !== null) {
    var _didError2 = false;
    var _error2 = void 0;
    {
      try {
        commitAllLifeCycles(root, committedExpirationTime);
      } catch (e) {
        _didError2 = true;
        _error2 = e;
      }
    }
    if (_didError2) {
      !(nextEffect !== null) ? reactProdInvariant('178') : void 0;
      captureCommitPhaseError(nextEffect, _error2);
      if (nextEffect !== null) {
        nextEffect = nextEffect.nextEffect;
      }
    }
  }

  if (firstEffect !== null && rootWithPendingPassiveEffects !== null) {
    // This commit included a passive effect. These do not need to fire until
    // after the next paint. Schedule an callback to fire them in an async
    // event. To ensure serial execution, the callback will be flushed early if
    // we enter rootWithPendingPassiveEffects commit phase before then.
    var callback = commitPassiveEffects.bind(null, root, firstEffect);
    if (enableSchedulerTracing) {
      // TODO: Avoid this extra callback by mutating the tracing ref directly,
      // like we do at the beginning of commitRoot. I've opted not to do that
      // here because that code is still in flux.
      callback = unstable_wrap(callback);
    }
    passiveEffectCallbackHandle = unstable_runWithPriority(unstable_NormalPriority, function () {
      return schedulePassiveEffects(callback);
    });
    passiveEffectCallback = callback;
  }

  isCommitting$1 = false;
  isWorking = false;
  stopCommitLifeCyclesTimer();
  stopCommitTimer();
  onCommitRoot(finishedWork.stateNode);
  var updateExpirationTimeAfterCommit = finishedWork.expirationTime;
  var childExpirationTimeAfterCommit = finishedWork.childExpirationTime;
  var earliestRemainingTimeAfterCommit = childExpirationTimeAfterCommit > updateExpirationTimeAfterCommit ? childExpirationTimeAfterCommit : updateExpirationTimeAfterCommit;
  if (earliestRemainingTimeAfterCommit === NoWork) {
    // If there's no remaining work, we can clear the set of already failed
    // error boundaries.
    legacyErrorBoundariesThatAlreadyFailed = null;
  }
  onCommit(root, earliestRemainingTimeAfterCommit);

  if (enableSchedulerTracing) {
    __interactionsRef.current = prevInteractions;

    var subscriber = void 0;

    try {
      subscriber = __subscriberRef.current;
      if (subscriber !== null && root.memoizedInteractions.size > 0) {
        var threadID = computeThreadID(committedExpirationTime, root.interactionThreadID);
        subscriber.onWorkStopped(root.memoizedInteractions, threadID);
      }
    } catch (error) {
      // It's not safe for commitRoot() to throw.
      // Store the error for now and we'll re-throw in finishRendering().
      if (!hasUnhandledError) {
        hasUnhandledError = true;
        unhandledError = error;
      }
    } finally {
      // Clear completed interactions from the pending Map.
      // Unless the render was suspended or cascading work was scheduled,
      // In which case– leave pending interactions until the subsequent render.
      var pendingInteractionMap = root.pendingInteractionMap;
      pendingInteractionMap.forEach(function (scheduledInteractions, scheduledExpirationTime) {
        // Only decrement the pending interaction count if we're done.
        // If there's still work at the current priority,
        // That indicates that we are waiting for suspense data.
        if (scheduledExpirationTime > earliestRemainingTimeAfterCommit) {
          pendingInteractionMap.delete(scheduledExpirationTime);

          scheduledInteractions.forEach(function (interaction) {
            interaction.__count--;

            if (subscriber !== null && interaction.__count === 0) {
              try {
                subscriber.onInteractionScheduledWorkCompleted(interaction);
              } catch (error) {
                // It's not safe for commitRoot() to throw.
                // Store the error for now and we'll re-throw in finishRendering().
                if (!hasUnhandledError) {
                  hasUnhandledError = true;
                  unhandledError = error;
                }
              }
            }
          });
        }
      });
    }
  }
}

function resetChildExpirationTime(workInProgress, renderTime) {
  if (renderTime !== Never && workInProgress.childExpirationTime === Never) {
    // The children of this component are hidden. Don't bubble their
    // expiration times.
    return;
  }

  var newChildExpirationTime = NoWork;

  // Bubble up the earliest expiration time.
  if (enableProfilerTimer && workInProgress.mode & ProfileMode) {
    // We're in profiling mode.
    // Let's use this same traversal to update the render durations.
    var actualDuration = workInProgress.actualDuration;
    var treeBaseDuration = workInProgress.selfBaseDuration;

    // When a fiber is cloned, its actualDuration is reset to 0.
    // This value will only be updated if work is done on the fiber (i.e. it doesn't bailout).
    // When work is done, it should bubble to the parent's actualDuration.
    // If the fiber has not been cloned though, (meaning no work was done),
    // Then this value will reflect the amount of time spent working on a previous render.
    // In that case it should not bubble.
    // We determine whether it was cloned by comparing the child pointer.
    var shouldBubbleActualDurations = workInProgress.alternate === null || workInProgress.child !== workInProgress.alternate.child;

    var child = workInProgress.child;
    while (child !== null) {
      var childUpdateExpirationTime = child.expirationTime;
      var childChildExpirationTime = child.childExpirationTime;
      if (childUpdateExpirationTime > newChildExpirationTime) {
        newChildExpirationTime = childUpdateExpirationTime;
      }
      if (childChildExpirationTime > newChildExpirationTime) {
        newChildExpirationTime = childChildExpirationTime;
      }
      if (shouldBubbleActualDurations) {
        actualDuration += child.actualDuration;
      }
      treeBaseDuration += child.treeBaseDuration;
      child = child.sibling;
    }
    workInProgress.actualDuration = actualDuration;
    workInProgress.treeBaseDuration = treeBaseDuration;
  } else {
    var _child = workInProgress.child;
    while (_child !== null) {
      var _childUpdateExpirationTime = _child.expirationTime;
      var _childChildExpirationTime = _child.childExpirationTime;
      if (_childUpdateExpirationTime > newChildExpirationTime) {
        newChildExpirationTime = _childUpdateExpirationTime;
      }
      if (_childChildExpirationTime > newChildExpirationTime) {
        newChildExpirationTime = _childChildExpirationTime;
      }
      _child = _child.sibling;
    }
  }

  workInProgress.childExpirationTime = newChildExpirationTime;
}

function completeUnitOfWork(workInProgress) {
  // Attempt to complete the current unit of work, then move to the
  // next sibling. If there are no more siblings, return to the
  // parent fiber.
  while (true) {
    // The current, flushed, state of this fiber is the alternate.
    // Ideally nothing should rely on this, but relying on it here
    // means that we don't need an additional field on the work in
    // progress.
    var current$$1 = workInProgress.alternate;
    var returnFiber = workInProgress.return;
    var siblingFiber = workInProgress.sibling;

    if ((workInProgress.effectTag & Incomplete) === NoEffect) {
      nextUnitOfWork = workInProgress;
      if (enableProfilerTimer) {
        if (workInProgress.mode & ProfileMode) {
          startProfilerTimer(workInProgress);
        }
        nextUnitOfWork = completeWork(current$$1, workInProgress, nextRenderExpirationTime);
        if (workInProgress.mode & ProfileMode) {
          // Update render duration assuming we didn't error.
          stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);
        }
      } else {
        nextUnitOfWork = completeWork(current$$1, workInProgress, nextRenderExpirationTime);
      }
      stopWorkTimer(workInProgress);
      resetChildExpirationTime(workInProgress, nextRenderExpirationTime);
      if (nextUnitOfWork !== null) {
        // Completing this fiber spawned new work. Work on that next.
        return nextUnitOfWork;
      }

      if (returnFiber !== null &&
      // Do not append effects to parents if a sibling failed to complete
      (returnFiber.effectTag & Incomplete) === NoEffect) {
        // Append all the effects of the subtree and this fiber onto the effect
        // list of the parent. The completion order of the children affects the
        // side-effect order.
        if (returnFiber.firstEffect === null) {
          returnFiber.firstEffect = workInProgress.firstEffect;
        }
        if (workInProgress.lastEffect !== null) {
          if (returnFiber.lastEffect !== null) {
            returnFiber.lastEffect.nextEffect = workInProgress.firstEffect;
          }
          returnFiber.lastEffect = workInProgress.lastEffect;
        }

        // If this fiber had side-effects, we append it AFTER the children's
        // side-effects. We can perform certain side-effects earlier if
        // needed, by doing multiple passes over the effect list. We don't want
        // to schedule our own side-effect on our own list because if end up
        // reusing children we'll schedule this effect onto itself since we're
        // at the end.
        var effectTag = workInProgress.effectTag;
        // Skip both NoWork and PerformedWork tags when creating the effect list.
        // PerformedWork effect is read by React DevTools but shouldn't be committed.
        if (effectTag > PerformedWork) {
          if (returnFiber.lastEffect !== null) {
            returnFiber.lastEffect.nextEffect = workInProgress;
          } else {
            returnFiber.firstEffect = workInProgress;
          }
          returnFiber.lastEffect = workInProgress;
        }
      }

      if (siblingFiber !== null) {
        // If there is more work to do in this returnFiber, do that next.
        return siblingFiber;
      } else if (returnFiber !== null) {
        // If there's no more work in this returnFiber. Complete the returnFiber.
        workInProgress = returnFiber;
        continue;
      } else {
        // We've reached the root.
        return null;
      }
    } else {
      if (enableProfilerTimer && workInProgress.mode & ProfileMode) {
        // Record the render duration for the fiber that errored.
        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);

        // Include the time spent working on failed children before continuing.
        var actualDuration = workInProgress.actualDuration;
        var child = workInProgress.child;
        while (child !== null) {
          actualDuration += child.actualDuration;
          child = child.sibling;
        }
        workInProgress.actualDuration = actualDuration;
      }

      // This fiber did not complete because something threw. Pop values off
      // the stack without entering the complete phase. If this is a boundary,
      // capture values if possible.
      var next = unwindWork(workInProgress, nextRenderExpirationTime);
      // Because this fiber did not complete, don't reset its expiration time.
      if (workInProgress.effectTag & DidCapture) {
        // Restarting an error boundary
        stopFailedWorkTimer(workInProgress);
      } else {
        stopWorkTimer(workInProgress);
      }

      if (next !== null) {
        stopWorkTimer(workInProgress);
        next.effectTag &= HostEffectMask;
        return next;
      }

      if (returnFiber !== null) {
        // Mark the parent fiber as incomplete and clear its effect list.
        returnFiber.firstEffect = returnFiber.lastEffect = null;
        returnFiber.effectTag |= Incomplete;
      }

      if (siblingFiber !== null) {
        // If there is more work to do in this returnFiber, do that next.
        return siblingFiber;
      } else if (returnFiber !== null) {
        // If there's no more work in this returnFiber. Complete the returnFiber.
        workInProgress = returnFiber;
        continue;
      } else {
        return null;
      }
    }
  }

  // Without this explicit null return Flow complains of invalid return type
  // TODO Remove the above while(true) loop
  // eslint-disable-next-line no-unreachable
  return null;
}

function performUnitOfWork(workInProgress) {
  // The current, flushed, state of this fiber is the alternate.
  // Ideally nothing should rely on this, but relying on it here
  // means that we don't need an additional field on the work in
  // progress.
  var current$$1 = workInProgress.alternate;

  // See if beginning this work spawns more work.
  startWorkTimer(workInProgress);
  var next = void 0;
  if (enableProfilerTimer) {
    if (workInProgress.mode & ProfileMode) {
      startProfilerTimer(workInProgress);
    }

    next = beginWork(current$$1, workInProgress, nextRenderExpirationTime);
    workInProgress.memoizedProps = workInProgress.pendingProps;

    if (workInProgress.mode & ProfileMode) {
      // Record the render duration assuming we didn't bailout (or error).
      stopProfilerTimerIfRunningAndRecordDelta(workInProgress, true);
    }
  } else {
    next = beginWork(current$$1, workInProgress, nextRenderExpirationTime);
    workInProgress.memoizedProps = workInProgress.pendingProps;
  }

  if (next === null) {
    // If this doesn't spawn new work, complete the current work.
    next = completeUnitOfWork(workInProgress);
  }

  ReactCurrentOwner$1.current = null;

  return next;
}

function workLoop(isYieldy) {
  if (!isYieldy) {
    // Flush work without yielding
    while (nextUnitOfWork !== null) {
      nextUnitOfWork = performUnitOfWork(nextUnitOfWork);
    }
  } else {
    // Flush asynchronous work until there's a higher priority event
    while (nextUnitOfWork !== null && !shouldYieldToRenderer()) {
      nextUnitOfWork = performUnitOfWork(nextUnitOfWork);
    }
  }
}

function renderRoot(root, isYieldy) {
  !!isWorking ? reactProdInvariant('243') : void 0;

  flushPassiveEffects$1();

  isWorking = true;
  var previousDispatcher = ReactCurrentDispatcher.current;
  ReactCurrentDispatcher.current = ContextOnlyDispatcher;

  var expirationTime = root.nextExpirationTimeToWorkOn;

  // Check if we're starting from a fresh stack, or if we're resuming from
  // previously yielded work.
  if (expirationTime !== nextRenderExpirationTime || root !== nextRoot || nextUnitOfWork === null) {
    // Reset the stack and start working from the root.
    resetStack();
    nextRoot = root;
    nextRenderExpirationTime = expirationTime;
    nextUnitOfWork = createWorkInProgress(nextRoot.current, null, nextRenderExpirationTime);
    root.pendingCommitExpirationTime = NoWork;

    if (enableSchedulerTracing) {
      // Determine which interactions this batch of work currently includes,
      // So that we can accurately attribute time spent working on it,
      var interactions = new Set();
      root.pendingInteractionMap.forEach(function (scheduledInteractions, scheduledExpirationTime) {
        if (scheduledExpirationTime >= expirationTime) {
          scheduledInteractions.forEach(function (interaction) {
            return interactions.add(interaction);
          });
        }
      });

      // Store the current set of interactions on the FiberRoot for a few reasons:
      // We can re-use it in hot functions like renderRoot() without having to recalculate it.
      // We will also use it in commitWork() to pass to any Profiler onRender() hooks.
      // This also provides DevTools with a way to access it when the onCommitRoot() hook is called.
      root.memoizedInteractions = interactions;

      if (interactions.size > 0) {
        var subscriber = __subscriberRef.current;
        if (subscriber !== null) {
          var threadID = computeThreadID(expirationTime, root.interactionThreadID);
          try {
            subscriber.onWorkStarted(interactions, threadID);
          } catch (error) {
            // Work thrown by an interaction tracing subscriber should be rethrown,
            // But only once it's safe (to avoid leaving the scheduler in an invalid state).
            // Store the error for now and we'll re-throw in finishRendering().
            if (!hasUnhandledError) {
              hasUnhandledError = true;
              unhandledError = error;
            }
          }
        }
      }
    }
  }

  var prevInteractions = null;
  if (enableSchedulerTracing) {
    // We're about to start new traced work.
    // Restore pending interactions so cascading work triggered during the render phase will be accounted for.
    prevInteractions = __interactionsRef.current;
    __interactionsRef.current = root.memoizedInteractions;
  }

  var didFatal = false;

  startWorkLoopTimer(nextUnitOfWork);

  do {
    try {
      workLoop(isYieldy);
    } catch (thrownValue) {
      resetContextDependences();
      resetHooks();

      // Reset in case completion throws.
      // This is only used in DEV and when replaying is on.
      if (nextUnitOfWork === null) {
        // This is a fatal error.
        didFatal = true;
        onUncaughtError(thrownValue);
      } else {
        if (enableProfilerTimer && nextUnitOfWork.mode & ProfileMode) {
          // Record the time spent rendering before an error was thrown.
          // This avoids inaccurate Profiler durations in the case of a suspended render.
          stopProfilerTimerIfRunningAndRecordDelta(nextUnitOfWork, true);
        }

        !(nextUnitOfWork !== null) ? reactProdInvariant('271') : void 0;

        var sourceFiber = nextUnitOfWork;
        var returnFiber = sourceFiber.return;
        if (returnFiber === null) {
          // This is the root. The root could capture its own errors. However,
          // we don't know if it errors before or after we pushed the host
          // context. This information is needed to avoid a stack mismatch.
          // Because we're not sure, treat this as a fatal error. We could track
          // which phase it fails in, but doesn't seem worth it. At least
          // for now.
          didFatal = true;
          onUncaughtError(thrownValue);
        } else {
          throwException(root, returnFiber, sourceFiber, thrownValue, nextRenderExpirationTime);
          nextUnitOfWork = completeUnitOfWork(sourceFiber);
          continue;
        }
      }
    }
    break;
  } while (true);

  if (enableSchedulerTracing) {
    // Traced work is done for now; restore the previous interactions.
    __interactionsRef.current = prevInteractions;
  }

  // We're done performing work. Time to clean up.
  isWorking = false;
  ReactCurrentDispatcher.current = previousDispatcher;
  resetContextDependences();
  resetHooks();

  // Yield back to main thread.
  if (didFatal) {
    var _didCompleteRoot = false;
    stopWorkLoopTimer(interruptedBy, _didCompleteRoot);
    interruptedBy = null;
    // There was a fatal error.
    nextRoot = null;
    onFatal(root);
    return;
  }

  if (nextUnitOfWork !== null) {
    // There's still remaining async work in this tree, but we ran out of time
    // in the current frame. Yield back to the renderer. Unless we're
    // interrupted by a higher priority update, we'll continue later from where
    // we left off.
    var _didCompleteRoot2 = false;
    stopWorkLoopTimer(interruptedBy, _didCompleteRoot2);
    interruptedBy = null;
    onYield(root);
    return;
  }

  // We completed the whole tree.
  var didCompleteRoot = true;
  stopWorkLoopTimer(interruptedBy, didCompleteRoot);
  var rootWorkInProgress = root.current.alternate;
  !(rootWorkInProgress !== null) ? reactProdInvariant('281') : void 0;

  // `nextRoot` points to the in-progress root. A non-null value indicates
  // that we're in the middle of an async render. Set it to null to indicate
  // there's no more work to be done in the current batch.
  nextRoot = null;
  interruptedBy = null;

  if (nextRenderDidError) {
    // There was an error
    if (hasLowerPriorityWork(root, expirationTime)) {
      // There's lower priority work. If so, it may have the effect of fixing
      // the exception that was just thrown. Exit without committing. This is
      // similar to a suspend, but without a timeout because we're not waiting
      // for a promise to resolve. React will restart at the lower
      // priority level.
      markSuspendedPriorityLevel(root, expirationTime);
      var suspendedExpirationTime = expirationTime;
      var rootExpirationTime = root.expirationTime;
      onSuspend(root, rootWorkInProgress, suspendedExpirationTime, rootExpirationTime, -1 // Indicates no timeout
      );
      return;
    } else if (
    // There's no lower priority work, but we're rendering asynchronously.
    // Synchronously attempt to render the same level one more time. This is
    // similar to a suspend, but without a timeout because we're not waiting
    // for a promise to resolve.
    !root.didError && isYieldy) {
      root.didError = true;
      var _suspendedExpirationTime = root.nextExpirationTimeToWorkOn = expirationTime;
      var _rootExpirationTime = root.expirationTime = Sync;
      onSuspend(root, rootWorkInProgress, _suspendedExpirationTime, _rootExpirationTime, -1 // Indicates no timeout
      );
      return;
    }
  }

  if (isYieldy && nextLatestAbsoluteTimeoutMs !== -1) {
    // The tree was suspended.
    var _suspendedExpirationTime2 = expirationTime;
    markSuspendedPriorityLevel(root, _suspendedExpirationTime2);

    // Find the earliest uncommitted expiration time in the tree, including
    // work that is suspended. The timeout threshold cannot be longer than
    // the overall expiration.
    var earliestExpirationTime = findEarliestOutstandingPriorityLevel(root, expirationTime);
    var earliestExpirationTimeMs = expirationTimeToMs(earliestExpirationTime);
    if (earliestExpirationTimeMs < nextLatestAbsoluteTimeoutMs) {
      nextLatestAbsoluteTimeoutMs = earliestExpirationTimeMs;
    }

    // Subtract the current time from the absolute timeout to get the number
    // of milliseconds until the timeout. In other words, convert an absolute
    // timestamp to a relative time. This is the value that is passed
    // to `setTimeout`.
    var currentTimeMs = expirationTimeToMs(requestCurrentTime());
    var msUntilTimeout = nextLatestAbsoluteTimeoutMs - currentTimeMs;
    msUntilTimeout = msUntilTimeout < 0 ? 0 : msUntilTimeout;

    // TODO: Account for the Just Noticeable Difference

    var _rootExpirationTime2 = root.expirationTime;
    onSuspend(root, rootWorkInProgress, _suspendedExpirationTime2, _rootExpirationTime2, msUntilTimeout);
    return;
  }

  // Ready to commit.
  onComplete(root, rootWorkInProgress, expirationTime);
}

function captureCommitPhaseError(sourceFiber, value) {
  var expirationTime = Sync;
  var fiber = sourceFiber.return;
  while (fiber !== null) {
    switch (fiber.tag) {
      case ClassComponent:
        var ctor = fiber.type;
        var instance = fiber.stateNode;
        if (typeof ctor.getDerivedStateFromError === 'function' || typeof instance.componentDidCatch === 'function' && !isAlreadyFailedLegacyErrorBoundary(instance)) {
          var errorInfo = createCapturedValue(value, sourceFiber);
          var update = createClassErrorUpdate(fiber, errorInfo, expirationTime);
          enqueueUpdate(fiber, update);
          scheduleWork(fiber, expirationTime);
          return;
        }
        break;
      case HostRoot:
        {
          var _errorInfo = createCapturedValue(value, sourceFiber);
          var _update = createRootErrorUpdate(fiber, _errorInfo, expirationTime);
          enqueueUpdate(fiber, _update);
          scheduleWork(fiber, expirationTime);
          return;
        }
    }
    fiber = fiber.return;
  }

  if (sourceFiber.tag === HostRoot) {
    // Error was thrown at the root. There is no parent, so the root
    // itself should capture it.
    var rootFiber = sourceFiber;
    var _errorInfo2 = createCapturedValue(value, rootFiber);
    var _update2 = createRootErrorUpdate(rootFiber, _errorInfo2, expirationTime);
    enqueueUpdate(rootFiber, _update2);
    scheduleWork(rootFiber, expirationTime);
  }
}

function computeThreadID(expirationTime, interactionThreadID) {
  // Interaction threads are unique per root and expiration time.
  return expirationTime * 1000 + interactionThreadID;
}

function computeExpirationForFiber(currentTime, fiber) {
  var priorityLevel = unstable_getCurrentPriorityLevel();

  var expirationTime = void 0;
  if ((fiber.mode & ConcurrentMode) === NoContext) {
    // Outside of concurrent mode, updates are always synchronous.
    expirationTime = Sync;
  } else if (isWorking && !isCommitting$1) {
    // During render phase, updates expire during as the current render.
    expirationTime = nextRenderExpirationTime;
  } else {
    switch (priorityLevel) {
      case unstable_ImmediatePriority:
        expirationTime = Sync;
        break;
      case unstable_UserBlockingPriority:
        expirationTime = computeInteractiveExpiration(currentTime);
        break;
      case unstable_NormalPriority:
        // This is a normal, concurrent update
        expirationTime = computeAsyncExpiration(currentTime);
        break;
      case unstable_LowPriority:
      case unstable_IdlePriority:
        expirationTime = Never;
        break;
      default:
        reactProdInvariant('313');
    }

    // If we're in the middle of rendering a tree, do not update at the same
    // expiration time that is already rendering.
    if (nextRoot !== null && expirationTime === nextRenderExpirationTime) {
      expirationTime -= 1;
    }
  }

  // Keep track of the lowest pending interactive expiration time. This
  // allows us to synchronously flush all interactive updates
  // when needed.
  // TODO: Move this to renderer?
  return expirationTime;
}

function renderDidSuspend(root, absoluteTimeoutMs, suspendedTime) {
  // Schedule the timeout.
  if (absoluteTimeoutMs >= 0 && nextLatestAbsoluteTimeoutMs < absoluteTimeoutMs) {
    nextLatestAbsoluteTimeoutMs = absoluteTimeoutMs;
  }
}

function renderDidError() {
  nextRenderDidError = true;
}

function pingSuspendedRoot(root, thenable, pingTime) {
  // A promise that previously suspended React from committing has resolved.
  // If React is still suspended, try again at the previous level (pingTime).

  var pingCache = root.pingCache;
  if (pingCache !== null) {
    // The thenable resolved, so we no longer need to memoize, because it will
    // never be thrown again.
    pingCache.delete(thenable);
  }

  if (nextRoot !== null && nextRenderExpirationTime === pingTime) {
    // Received a ping at the same priority level at which we're currently
    // rendering. Restart from the root.
    nextRoot = null;
  } else {
    // Confirm that the root is still suspended at this level. Otherwise exit.
    if (isPriorityLevelSuspended(root, pingTime)) {
      // Ping at the original level
      markPingedPriorityLevel(root, pingTime);
      var rootExpirationTime = root.expirationTime;
      if (rootExpirationTime !== NoWork) {
        requestWork(root, rootExpirationTime);
      }
    }
  }
}

function retryTimedOutBoundary(boundaryFiber, thenable) {
  // The boundary fiber (a Suspense component) previously timed out and was
  // rendered in its fallback state. One of the promises that suspended it has
  // resolved, which means at least part of the tree was likely unblocked. Try
  var retryCache = void 0;
  if (enableSuspenseServerRenderer) {
    switch (boundaryFiber.tag) {
      case SuspenseComponent:
        retryCache = boundaryFiber.stateNode;
        break;
      case DehydratedSuspenseComponent:
        retryCache = boundaryFiber.memoizedState;
        break;
      default:
        reactProdInvariant('314');
    }
  } else {
    retryCache = boundaryFiber.stateNode;
  }
  if (retryCache !== null) {
    // The thenable resolved, so we no longer need to memoize, because it will
    // never be thrown again.
    retryCache.delete(thenable);
  }

  var currentTime = requestCurrentTime();
  var retryTime = computeExpirationForFiber(currentTime, boundaryFiber);
  var root = scheduleWorkToRoot(boundaryFiber, retryTime);
  if (root !== null) {
    markPendingPriorityLevel(root, retryTime);
    var rootExpirationTime = root.expirationTime;
    if (rootExpirationTime !== NoWork) {
      requestWork(root, rootExpirationTime);
    }
  }
}

function scheduleWorkToRoot(fiber, expirationTime) {
  recordScheduleUpdate();

  if (fiber.expirationTime < expirationTime) {
    fiber.expirationTime = expirationTime;
  }
  var alternate = fiber.alternate;
  if (alternate !== null && alternate.expirationTime < expirationTime) {
    alternate.expirationTime = expirationTime;
  }
  // Walk the parent path to the root and update the child expiration time.
  var node = fiber.return;
  var root = null;
  if (node === null && fiber.tag === HostRoot) {
    root = fiber.stateNode;
  } else {
    while (node !== null) {
      alternate = node.alternate;
      if (node.childExpirationTime < expirationTime) {
        node.childExpirationTime = expirationTime;
        if (alternate !== null && alternate.childExpirationTime < expirationTime) {
          alternate.childExpirationTime = expirationTime;
        }
      } else if (alternate !== null && alternate.childExpirationTime < expirationTime) {
        alternate.childExpirationTime = expirationTime;
      }
      if (node.return === null && node.tag === HostRoot) {
        root = node.stateNode;
        break;
      }
      node = node.return;
    }
  }

  if (enableSchedulerTracing) {
    if (root !== null) {
      var interactions = __interactionsRef.current;
      if (interactions.size > 0) {
        var pendingInteractionMap = root.pendingInteractionMap;
        var pendingInteractions = pendingInteractionMap.get(expirationTime);
        if (pendingInteractions != null) {
          interactions.forEach(function (interaction) {
            if (!pendingInteractions.has(interaction)) {
              // Update the pending async work count for previously unscheduled interaction.
              interaction.__count++;
            }

            pendingInteractions.add(interaction);
          });
        } else {
          pendingInteractionMap.set(expirationTime, new Set(interactions));

          // Update the pending async work count for the current interactions.
          interactions.forEach(function (interaction) {
            interaction.__count++;
          });
        }

        var subscriber = __subscriberRef.current;
        if (subscriber !== null) {
          var threadID = computeThreadID(expirationTime, root.interactionThreadID);
          subscriber.onWorkScheduled(interactions, threadID);
        }
      }
    }
  }
  return root;
}



function scheduleWork(fiber, expirationTime) {
  var root = scheduleWorkToRoot(fiber, expirationTime);
  if (root === null) {
    return;
  }

  if (!isWorking && nextRenderExpirationTime !== NoWork && expirationTime > nextRenderExpirationTime) {
    // This is an interruption. (Used for performance tracking.)
    interruptedBy = fiber;
    resetStack();
  }
  markPendingPriorityLevel(root, expirationTime);
  if (
  // If we're in the render phase, we don't need to schedule this root
  // for an update, because we'll do it before we exit...
  !isWorking || isCommitting$1 ||
  // ...unless this is a different root than the one we're rendering.
  nextRoot !== root) {
    var rootExpirationTime = root.expirationTime;
    requestWork(root, rootExpirationTime);
  }
  if (nestedUpdateCount > NESTED_UPDATE_LIMIT) {
    // Reset this back to zero so subsequent updates don't throw.
    nestedUpdateCount = 0;
    reactProdInvariant('185');
  }
}

function syncUpdates(fn, a, b, c, d) {
  return unstable_runWithPriority(unstable_ImmediatePriority, function () {
    return fn(a, b, c, d);
  });
}

// TODO: Everything below this is written as if it has been lifted to the
// renderers. I'll do this in a follow-up.

// Linked-list of roots
var firstScheduledRoot = null;
var lastScheduledRoot = null;

var callbackExpirationTime = NoWork;
var callbackID = void 0;
var isRendering = false;
var nextFlushedRoot = null;
var nextFlushedExpirationTime = NoWork;
var hasUnhandledError = false;
var unhandledError = null;

var isBatchingUpdates = false;
var isUnbatchingUpdates = false;

var completedBatches = null;

var originalStartTimeMs = now();
var currentRendererTime = msToExpirationTime(originalStartTimeMs);
var currentSchedulerTime = currentRendererTime;

// Use these to prevent an infinite loop of nested updates
var NESTED_UPDATE_LIMIT = 50;
var nestedUpdateCount = 0;
var lastCommittedRootDuringThisBatch = null;

function recomputeCurrentRendererTime() {
  var currentTimeMs = now() - originalStartTimeMs;
  currentRendererTime = msToExpirationTime(currentTimeMs);
}

function scheduleCallbackWithExpirationTime(root, expirationTime) {
  if (callbackExpirationTime !== NoWork) {
    // A callback is already scheduled. Check its expiration time (timeout).
    if (expirationTime < callbackExpirationTime) {
      // Existing callback has sufficient timeout. Exit.
      return;
    } else {
      if (callbackID !== null) {
        // Existing callback has insufficient timeout. Cancel and schedule a
        // new one.
        cancelDeferredCallback$$1(callbackID);
      }
    }
    // The request callback timer is already running. Don't start a new one.
  } else {
    startRequestCallbackTimer();
  }

  callbackExpirationTime = expirationTime;
  var currentMs = now() - originalStartTimeMs;
  var expirationTimeMs = expirationTimeToMs(expirationTime);
  var timeout = expirationTimeMs - currentMs;
  callbackID = scheduleDeferredCallback$$1(performAsyncWork, { timeout: timeout });
}

// For every call to renderRoot, one of onFatal, onComplete, onSuspend, and
// onYield is called upon exiting. We use these in lieu of returning a tuple.
// I've also chosen not to inline them into renderRoot because these will
// eventually be lifted into the renderer.
function onFatal(root) {
  root.finishedWork = null;
}

function onComplete(root, finishedWork, expirationTime) {
  root.pendingCommitExpirationTime = expirationTime;
  root.finishedWork = finishedWork;
}

function onSuspend(root, finishedWork, suspendedExpirationTime, rootExpirationTime, msUntilTimeout) {
  root.expirationTime = rootExpirationTime;
  if (msUntilTimeout === 0 && !shouldYieldToRenderer()) {
    // Don't wait an additional tick. Commit the tree immediately.
    root.pendingCommitExpirationTime = suspendedExpirationTime;
    root.finishedWork = finishedWork;
  } else if (msUntilTimeout > 0) {
    // Wait `msUntilTimeout` milliseconds before committing.
    root.timeoutHandle = scheduleTimeout(onTimeout.bind(null, root, finishedWork, suspendedExpirationTime), msUntilTimeout);
  }
}

function onYield(root) {
  root.finishedWork = null;
}

function onTimeout(root, finishedWork, suspendedExpirationTime) {
  // The root timed out. Commit it.
  root.pendingCommitExpirationTime = suspendedExpirationTime;
  root.finishedWork = finishedWork;
  // Read the current time before entering the commit phase. We can be
  // certain this won't cause tearing related to batching of event updates
  // because we're at the top of a timer event.
  recomputeCurrentRendererTime();
  currentSchedulerTime = currentRendererTime;
  flushRoot(root, suspendedExpirationTime);
}

function onCommit(root, expirationTime) {
  root.expirationTime = expirationTime;
  root.finishedWork = null;
}

function requestCurrentTime() {
  // requestCurrentTime is called by the scheduler to compute an expiration
  // time.
  //
  // Expiration times are computed by adding to the current time (the start
  // time). However, if two updates are scheduled within the same event, we
  // should treat their start times as simultaneous, even if the actual clock
  // time has advanced between the first and second call.

  // In other words, because expiration times determine how updates are batched,
  // we want all updates of like priority that occur within the same event to
  // receive the same expiration time. Otherwise we get tearing.
  //
  // We keep track of two separate times: the current "renderer" time and the
  // current "scheduler" time. The renderer time can be updated whenever; it
  // only exists to minimize the calls performance.now.
  //
  // But the scheduler time can only be updated if there's no pending work, or
  // if we know for certain that we're not in the middle of an event.

  if (isRendering) {
    // We're already rendering. Return the most recently read time.
    return currentSchedulerTime;
  }
  // Check if there's pending work.
  findHighestPriorityRoot();
  if (nextFlushedExpirationTime === NoWork || nextFlushedExpirationTime === Never) {
    // If there's no pending work, or if the pending work is offscreen, we can
    // read the current time without risk of tearing.
    recomputeCurrentRendererTime();
    currentSchedulerTime = currentRendererTime;
    return currentSchedulerTime;
  }
  // There's already pending work. We might be in the middle of a browser
  // event. If we were to read the current time, it could cause multiple updates
  // within the same event to receive different expiration times, leading to
  // tearing. Return the last read time. During the next idle callback, the
  // time will be updated.
  return currentSchedulerTime;
}

// requestWork is called by the scheduler whenever a root receives an update.
// It's up to the renderer to call renderRoot at some point in the future.
function requestWork(root, expirationTime) {
  addRootToSchedule(root, expirationTime);
  if (isRendering) {
    // Prevent reentrancy. Remaining work will be scheduled at the end of
    // the currently rendering batch.
    return;
  }

  if (isBatchingUpdates) {
    // Flush work at the end of the batch.
    if (isUnbatchingUpdates) {
      // ...unless we're inside unbatchedUpdates, in which case we should
      // flush it now.
      nextFlushedRoot = root;
      nextFlushedExpirationTime = Sync;
      performWorkOnRoot(root, Sync, false);
    }
    return;
  }

  // TODO: Get rid of Sync and use current time?
  if (expirationTime === Sync) {
    performSyncWork();
  } else {
    scheduleCallbackWithExpirationTime(root, expirationTime);
  }
}

function addRootToSchedule(root, expirationTime) {
  // Add the root to the schedule.
  // Check if this root is already part of the schedule.
  if (root.nextScheduledRoot === null) {
    // This root is not already scheduled. Add it.
    root.expirationTime = expirationTime;
    if (lastScheduledRoot === null) {
      firstScheduledRoot = lastScheduledRoot = root;
      root.nextScheduledRoot = root;
    } else {
      lastScheduledRoot.nextScheduledRoot = root;
      lastScheduledRoot = root;
      lastScheduledRoot.nextScheduledRoot = firstScheduledRoot;
    }
  } else {
    // This root is already scheduled, but its priority may have increased.
    var remainingExpirationTime = root.expirationTime;
    if (expirationTime > remainingExpirationTime) {
      // Update the priority.
      root.expirationTime = expirationTime;
    }
  }
}

function findHighestPriorityRoot() {
  var highestPriorityWork = NoWork;
  var highestPriorityRoot = null;
  if (lastScheduledRoot !== null) {
    var previousScheduledRoot = lastScheduledRoot;
    var root = firstScheduledRoot;
    while (root !== null) {
      var remainingExpirationTime = root.expirationTime;
      if (remainingExpirationTime === NoWork) {
        // This root no longer has work. Remove it from the scheduler.

        // TODO: This check is redudant, but Flow is confused by the branch
        // below where we set lastScheduledRoot to null, even though we break
        // from the loop right after.
        !(previousScheduledRoot !== null && lastScheduledRoot !== null) ? reactProdInvariant('244') : void 0;
        if (root === root.nextScheduledRoot) {
          // This is the only root in the list.
          root.nextScheduledRoot = null;
          firstScheduledRoot = lastScheduledRoot = null;
          break;
        } else if (root === firstScheduledRoot) {
          // This is the first root in the list.
          var next = root.nextScheduledRoot;
          firstScheduledRoot = next;
          lastScheduledRoot.nextScheduledRoot = next;
          root.nextScheduledRoot = null;
        } else if (root === lastScheduledRoot) {
          // This is the last root in the list.
          lastScheduledRoot = previousScheduledRoot;
          lastScheduledRoot.nextScheduledRoot = firstScheduledRoot;
          root.nextScheduledRoot = null;
          break;
        } else {
          previousScheduledRoot.nextScheduledRoot = root.nextScheduledRoot;
          root.nextScheduledRoot = null;
        }
        root = previousScheduledRoot.nextScheduledRoot;
      } else {
        if (remainingExpirationTime > highestPriorityWork) {
          // Update the priority, if it's higher
          highestPriorityWork = remainingExpirationTime;
          highestPriorityRoot = root;
        }
        if (root === lastScheduledRoot) {
          break;
        }
        if (highestPriorityWork === Sync) {
          // Sync is highest priority by definition so
          // we can stop searching.
          break;
        }
        previousScheduledRoot = root;
        root = root.nextScheduledRoot;
      }
    }
  }

  nextFlushedRoot = highestPriorityRoot;
  nextFlushedExpirationTime = highestPriorityWork;
}

// TODO: This wrapper exists because many of the older tests (the ones that use
// flushDeferredPri) rely on the number of times `shouldYield` is called. We
// should get rid of it.
var didYield = false;
function shouldYieldToRenderer() {
  if (didYield) {
    return true;
  }
  if (shouldYield$$1()) {
    didYield = true;
    return true;
  }
  return false;
}

function performAsyncWork() {
  try {
    if (!shouldYieldToRenderer()) {
      // The callback timed out. That means at least one update has expired.
      // Iterate through the root schedule. If they contain expired work, set
      // the next render expiration time to the current time. This has the effect
      // of flushing all expired work in a single batch, instead of flushing each
      // level one at a time.
      if (firstScheduledRoot !== null) {
        recomputeCurrentRendererTime();
        var root = firstScheduledRoot;
        do {
          didExpireAtExpirationTime(root, currentRendererTime);
          // The root schedule is circular, so this is never null.
          root = root.nextScheduledRoot;
        } while (root !== firstScheduledRoot);
      }
    }
    performWork(NoWork, true);
  } finally {
    didYield = false;
  }
}

function performSyncWork() {
  performWork(Sync, false);
}

function performWork(minExpirationTime, isYieldy) {
  // Keep working on roots until there's no more work, or until there's a higher
  // priority event.
  findHighestPriorityRoot();

  if (isYieldy) {
    recomputeCurrentRendererTime();
    currentSchedulerTime = currentRendererTime;

    if (enableUserTimingAPI) {
      var didExpire = nextFlushedExpirationTime > currentRendererTime;
      var timeout = expirationTimeToMs(nextFlushedExpirationTime);
      stopRequestCallbackTimer(didExpire, timeout);
    }

    while (nextFlushedRoot !== null && nextFlushedExpirationTime !== NoWork && minExpirationTime <= nextFlushedExpirationTime && !(didYield && currentRendererTime > nextFlushedExpirationTime)) {
      performWorkOnRoot(nextFlushedRoot, nextFlushedExpirationTime, currentRendererTime > nextFlushedExpirationTime);
      findHighestPriorityRoot();
      recomputeCurrentRendererTime();
      currentSchedulerTime = currentRendererTime;
    }
  } else {
    while (nextFlushedRoot !== null && nextFlushedExpirationTime !== NoWork && minExpirationTime <= nextFlushedExpirationTime) {
      performWorkOnRoot(nextFlushedRoot, nextFlushedExpirationTime, false);
      findHighestPriorityRoot();
    }
  }

  // We're done flushing work. Either we ran out of time in this callback,
  // or there's no more work left with sufficient priority.

  // If we're inside a callback, set this to false since we just completed it.
  if (isYieldy) {
    callbackExpirationTime = NoWork;
    callbackID = null;
  }
  // If there's work left over, schedule a new callback.
  if (nextFlushedExpirationTime !== NoWork) {
    scheduleCallbackWithExpirationTime(nextFlushedRoot, nextFlushedExpirationTime);
  }

  // Clean-up.
  finishRendering();
}

function flushRoot(root, expirationTime) {
  !!isRendering ? reactProdInvariant('253') : void 0;
  // Perform work on root as if the given expiration time is the current time.
  // This has the effect of synchronously flushing all work up to and
  // including the given time.
  nextFlushedRoot = root;
  nextFlushedExpirationTime = expirationTime;
  performWorkOnRoot(root, expirationTime, false);
  // Flush any sync work that was scheduled by lifecycles
  performSyncWork();
}

function finishRendering() {
  nestedUpdateCount = 0;
  lastCommittedRootDuringThisBatch = null;

  if (completedBatches !== null) {
    var batches = completedBatches;
    completedBatches = null;
    for (var i = 0; i < batches.length; i++) {
      var batch = batches[i];
      try {
        batch._onComplete();
      } catch (error) {
        if (!hasUnhandledError) {
          hasUnhandledError = true;
          unhandledError = error;
        }
      }
    }
  }

  if (hasUnhandledError) {
    var error = unhandledError;
    unhandledError = null;
    hasUnhandledError = false;
    throw error;
  }
}

function performWorkOnRoot(root, expirationTime, isYieldy) {
  !!isRendering ? reactProdInvariant('245') : void 0;

  isRendering = true;

  // Check if this is async work or sync/expired work.
  if (!isYieldy) {
    // Flush work without yielding.
    // TODO: Non-yieldy work does not necessarily imply expired work. A renderer
    // may want to perform some work without yielding, but also without
    // requiring the root to complete (by triggering placeholders).

    var finishedWork = root.finishedWork;
    if (finishedWork !== null) {
      // This root is already complete. We can commit it.
      completeRoot(root, finishedWork, expirationTime);
    } else {
      root.finishedWork = null;
      // If this root previously suspended, clear its existing timeout, since
      // we're about to try rendering again.
      var timeoutHandle = root.timeoutHandle;
      if (timeoutHandle !== noTimeout) {
        root.timeoutHandle = noTimeout;
        // $FlowFixMe Complains noTimeout is not a TimeoutID, despite the check above
        cancelTimeout(timeoutHandle);
      }
      renderRoot(root, isYieldy);
      finishedWork = root.finishedWork;
      if (finishedWork !== null) {
        // We've completed the root. Commit it.
        completeRoot(root, finishedWork, expirationTime);
      }
    }
  } else {
    // Flush async work.
    var _finishedWork = root.finishedWork;
    if (_finishedWork !== null) {
      // This root is already complete. We can commit it.
      completeRoot(root, _finishedWork, expirationTime);
    } else {
      root.finishedWork = null;
      // If this root previously suspended, clear its existing timeout, since
      // we're about to try rendering again.
      var _timeoutHandle = root.timeoutHandle;
      if (_timeoutHandle !== noTimeout) {
        root.timeoutHandle = noTimeout;
        // $FlowFixMe Complains noTimeout is not a TimeoutID, despite the check above
        cancelTimeout(_timeoutHandle);
      }
      renderRoot(root, isYieldy);
      _finishedWork = root.finishedWork;
      if (_finishedWork !== null) {
        // We've completed the root. Check the if we should yield one more time
        // before committing.
        if (!shouldYieldToRenderer()) {
          // Still time left. Commit the root.
          completeRoot(root, _finishedWork, expirationTime);
        } else {
          // There's no time left. Mark this root as complete. We'll come
          // back and commit it later.
          root.finishedWork = _finishedWork;
        }
      }
    }
  }

  isRendering = false;
}

function completeRoot(root, finishedWork, expirationTime) {
  // Check if there's a batch that matches this expiration time.
  var firstBatch = root.firstBatch;
  if (firstBatch !== null && firstBatch._expirationTime >= expirationTime) {
    if (completedBatches === null) {
      completedBatches = [firstBatch];
    } else {
      completedBatches.push(firstBatch);
    }
    if (firstBatch._defer) {
      // This root is blocked from committing by a batch. Unschedule it until
      // we receive another update.
      root.finishedWork = finishedWork;
      root.expirationTime = NoWork;
      return;
    }
  }

  // Commit the root.
  root.finishedWork = null;

  // Check if this is a nested update (a sync update scheduled during the
  // commit phase).
  if (root === lastCommittedRootDuringThisBatch) {
    // If the next root is the same as the previous root, this is a nested
    // update. To prevent an infinite loop, increment the nested update count.
    nestedUpdateCount++;
  } else {
    // Reset whenever we switch roots.
    lastCommittedRootDuringThisBatch = root;
    nestedUpdateCount = 0;
  }
  unstable_runWithPriority(unstable_ImmediatePriority, function () {
    commitRoot(root, finishedWork);
  });
}

function onUncaughtError(error) {
  !(nextFlushedRoot !== null) ? reactProdInvariant('246') : void 0;
  // Unschedule this root so we don't work on it again until there's
  // another update.
  nextFlushedRoot.expirationTime = NoWork;
  if (!hasUnhandledError) {
    hasUnhandledError = true;
    unhandledError = error;
  }
}

// TODO: Batching should be implemented at the renderer level, not inside
// the reconciler.
function batchedUpdates(fn, a) {
  var previousIsBatchingUpdates = isBatchingUpdates;
  isBatchingUpdates = true;
  try {
    return fn(a);
  } finally {
    isBatchingUpdates = previousIsBatchingUpdates;
    if (!isBatchingUpdates && !isRendering) {
      performSyncWork();
    }
  }
}

// TODO: Batching should be implemented at the renderer level, not within
// the reconciler.
function flushSync(fn, a) {
  !!isRendering ? reactProdInvariant('187') : void 0;
  var previousIsBatchingUpdates = isBatchingUpdates;
  isBatchingUpdates = true;
  try {
    return syncUpdates(fn, a);
  } finally {
    isBatchingUpdates = previousIsBatchingUpdates;
    performSyncWork();
  }
}

function getContextForSubtree(parentComponent) {
  if (!parentComponent) {
    return emptyContextObject;
  }

  var fiber = get(parentComponent);
  var parentContext = findCurrentUnmaskedContext(fiber);

  if (fiber.tag === ClassComponent) {
    var Component = fiber.type;
    if (isContextProvider(Component)) {
      return processChildContext(fiber, Component, parentContext);
    }
  }

  return parentContext;
}

function scheduleRootUpdate(current$$1, element, expirationTime, callback) {
  var update = createUpdate(expirationTime);
  // Caution: React DevTools currently depends on this property
  // being called "element".
  update.payload = { element: element };

  callback = callback === undefined ? null : callback;
  if (callback !== null) {
    update.callback = callback;
  }

  flushPassiveEffects$1();
  enqueueUpdate(current$$1, update);
  scheduleWork(current$$1, expirationTime);

  return expirationTime;
}

function updateContainerAtExpirationTime(element, container, parentComponent, expirationTime, callback) {
  // TODO: If this is a nested container, this won't be the root.
  var current$$1 = container.current;

  var context = getContextForSubtree(parentComponent);
  if (container.context === null) {
    container.context = context;
  } else {
    container.pendingContext = context;
  }

  return scheduleRootUpdate(current$$1, element, expirationTime, callback);
}

function createContainer(containerInfo, isConcurrent, hydrate) {
  return createFiberRoot(containerInfo, isConcurrent, hydrate);
}

function updateContainer(element, container, parentComponent, callback) {
  var current$$1 = container.current;
  var currentTime = requestCurrentTime();
  var expirationTime = computeExpirationForFiber(currentTime, current$$1);
  return updateContainerAtExpirationTime(element, container, parentComponent, expirationTime, callback);
}

function getPublicRootInstance(container) {
  var containerFiber = container.current;
  if (!containerFiber.child) {
    return null;
  }
  switch (containerFiber.child.tag) {
    case HostComponent:
      return getPublicInstance(containerFiber.child.stateNode);
    default:
      return containerFiber.child.stateNode;
  }
}



var overrideProps = null;

function injectIntoDevTools(devToolsConfig) {
  var findFiberByHostInstance = devToolsConfig.findFiberByHostInstance;
  var ReactCurrentDispatcher = ReactSharedInternals.ReactCurrentDispatcher;


  return injectInternals(_assign({}, devToolsConfig, {
    overrideProps: overrideProps,
    currentDispatcherRef: ReactCurrentDispatcher,
    findHostInstanceByFiber: function (fiber) {
      var hostFiber = findCurrentHostFiber(fiber);
      if (hostFiber === null) {
        return null;
      }
      return hostFiber.stateNode;
    },
    findFiberByHostInstance: function (instance) {
      if (!findFiberByHostInstance) {
        // Might not be implemented by the renderer.
        return null;
      }
      return findFiberByHostInstance(instance);
    }
  }));
}

// This file intentionally does *not* have the Flow annotation.
// Don't add it. See `./inline-typed.js` for an explanation.

// TODO: this is special because it gets imported during build.

var ReactVersion = '16.8.6';

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }

// for .act's return value


var defaultTestOptions = {
  createNodeMock: function () {
    return null;
  }
};

function toJSON(inst) {
  if (inst.isHidden) {
    // Omit timed out children from output entirely. This seems like the least
    // surprising behavior. We could perhaps add a separate API that includes
    // them, if it turns out people need it.
    return null;
  }
  switch (inst.tag) {
    case 'TEXT':
      return inst.text;
    case 'INSTANCE':
      {
        /* eslint-disable no-unused-vars */
        // We don't include the `children` prop in JSON.
        // Instead, we will include the actual rendered children.
        var _inst$props = inst.props,
            _children = _inst$props.children,
            _props = _objectWithoutProperties(_inst$props, ['children']);
        /* eslint-enable */


        var renderedChildren = null;
        if (inst.children && inst.children.length) {
          for (var i = 0; i < inst.children.length; i++) {
            var renderedChild = toJSON(inst.children[i]);
            if (renderedChild !== null) {
              if (renderedChildren === null) {
                renderedChildren = [renderedChild];
              } else {
                renderedChildren.push(renderedChild);
              }
            }
          }
        }
        var json = {
          type: inst.type,
          props: _props,
          children: renderedChildren
        };
        Object.defineProperty(json, '$$typeof', {
          value: Symbol.for('react.test.json')
        });
        return json;
      }
    default:
      throw new Error('Unexpected node type in toJSON: ' + inst.tag);
  }
}

function childrenToTree(node) {
  if (!node) {
    return null;
  }
  var children = nodeAndSiblingsArray(node);
  if (children.length === 0) {
    return null;
  } else if (children.length === 1) {
    return toTree(children[0]);
  }
  return flatten(children.map(toTree));
}

function nodeAndSiblingsArray(nodeWithSibling) {
  var array = [];
  var node = nodeWithSibling;
  while (node != null) {
    array.push(node);
    node = node.sibling;
  }
  return array;
}

function flatten(arr) {
  var result = [];
  var stack = [{ i: 0, array: arr }];
  while (stack.length) {
    var n = stack.pop();
    while (n.i < n.array.length) {
      var el = n.array[n.i];
      n.i += 1;
      if (Array.isArray(el)) {
        stack.push(n);
        stack.push({ i: 0, array: el });
        break;
      }
      result.push(el);
    }
  }
  return result;
}

function toTree(node) {
  if (node == null) {
    return null;
  }
  switch (node.tag) {
    case HostRoot:
      return childrenToTree(node.child);
    case HostPortal:
      return childrenToTree(node.child);
    case ClassComponent:
      return {
        nodeType: 'component',
        type: node.type,
        props: _assign({}, node.memoizedProps),
        instance: node.stateNode,
        rendered: childrenToTree(node.child)
      };
    case FunctionComponent:
    case SimpleMemoComponent:
      return {
        nodeType: 'component',
        type: node.type,
        props: _assign({}, node.memoizedProps),
        instance: null,
        rendered: childrenToTree(node.child)
      };
    case HostComponent:
      {
        return {
          nodeType: 'host',
          type: node.type,
          props: _assign({}, node.memoizedProps),
          instance: null, // TODO: use createNodeMock here somehow?
          rendered: flatten(nodeAndSiblingsArray(node.child).map(toTree))
        };
      }
    case HostText:
      return node.stateNode.text;
    case Fragment:
    case ContextProvider:
    case ContextConsumer:
    case Mode:
    case Profiler:
    case ForwardRef:
    case MemoComponent:
    case IncompleteClassComponent:
      return childrenToTree(node.child);
    default:
      reactProdInvariant('214', node.tag);
  }
}

var validWrapperTypes = new Set([FunctionComponent, ClassComponent, HostComponent, ForwardRef, MemoComponent, SimpleMemoComponent,
// Normally skipped, but used when there's more than one root child.
HostRoot]);

function getChildren(parent) {
  var children = [];
  var startingNode = parent;
  var node = startingNode;
  if (node.child === null) {
    return children;
  }
  node.child.return = node;
  node = node.child;
  outer: while (true) {
    var descend = false;
    if (validWrapperTypes.has(node.tag)) {
      children.push(wrapFiber(node));
    } else if (node.tag === HostText) {
      children.push('' + node.memoizedProps);
    } else {
      descend = true;
    }
    if (descend && node.child !== null) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    while (node.sibling === null) {
      if (node.return === startingNode) {
        break outer;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
  return children;
}

var ReactTestInstance = function () {
  ReactTestInstance.prototype._currentFiber = function _currentFiber() {
    // Throws if this component has been unmounted.
    var fiber = findCurrentFiberUsingSlowPath(this._fiber);
    !(fiber !== null) ? reactProdInvariant('224') : void 0;
    return fiber;
  };

  function ReactTestInstance(fiber) {
    _classCallCheck(this, ReactTestInstance);

    !validWrapperTypes.has(fiber.tag) ? reactProdInvariant('225', fiber.tag) : void 0;
    this._fiber = fiber;
  }

  // Custom search functions
  ReactTestInstance.prototype.find = function find(predicate) {
    return expectOne(this.findAll(predicate, { deep: false }), 'matching custom predicate: ' + predicate.toString());
  };

  ReactTestInstance.prototype.findByType = function findByType(type) {
    return expectOne(this.findAllByType(type, { deep: false }), 'with node type: "' + (type.displayName || type.name) + '"');
  };

  ReactTestInstance.prototype.findByProps = function findByProps(props) {
    return expectOne(this.findAllByProps(props, { deep: false }), 'with props: ' + JSON.stringify(props));
  };

  ReactTestInstance.prototype.findAll = function findAll(predicate) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;

    return _findAll(this, predicate, options);
  };

  ReactTestInstance.prototype.findAllByType = function findAllByType(type) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;

    return _findAll(this, function (node) {
      return node.type === type;
    }, options);
  };

  ReactTestInstance.prototype.findAllByProps = function findAllByProps(props) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;

    return _findAll(this, function (node) {
      return node.props && propsMatch(node.props, props);
    }, options);
  };

  _createClass(ReactTestInstance, [{
    key: 'instance',
    get: function () {
      if (this._fiber.tag === HostComponent) {
        return getPublicInstance(this._fiber.stateNode);
      } else {
        return this._fiber.stateNode;
      }
    }
  }, {
    key: 'type',
    get: function () {
      return this._fiber.type;
    }
  }, {
    key: 'props',
    get: function () {
      return this._currentFiber().memoizedProps;
    }
  }, {
    key: 'parent',
    get: function () {
      var parent = this._fiber.return;
      while (parent !== null) {
        if (validWrapperTypes.has(parent.tag)) {
          if (parent.tag === HostRoot) {
            // Special case: we only "materialize" instances for roots
            // if they have more than a single child. So we'll check that now.
            if (getChildren(parent).length < 2) {
              return null;
            }
          }
          return wrapFiber(parent);
        }
        parent = parent.return;
      }
      return null;
    }
  }, {
    key: 'children',
    get: function () {
      return getChildren(this._currentFiber());
    }
  }]);

  return ReactTestInstance;
}();

function _findAll(root, predicate, options) {
  var deep = options ? options.deep : true;
  var results = [];

  if (predicate(root)) {
    results.push(root);
    if (!deep) {
      return results;
    }
  }

  root.children.forEach(function (child) {
    if (typeof child === 'string') {
      return;
    }
    results.push.apply(results, _findAll(child, predicate, options));
  });

  return results;
}

function expectOne(all, message) {
  if (all.length === 1) {
    return all[0];
  }

  var prefix = all.length === 0 ? 'No instances found ' : 'Expected 1 but found ' + all.length + ' instances ';

  throw new Error(prefix + message);
}

function propsMatch(props, filter) {
  for (var key in filter) {
    if (props[key] !== filter[key]) {
      return false;
    }
  }
  return true;
}

var ReactTestRendererFiber = {
  create: function (element, options) {
    var createNodeMock = defaultTestOptions.createNodeMock;
    var isConcurrent = false;
    if (typeof options === 'object' && options !== null) {
      if (typeof options.createNodeMock === 'function') {
        createNodeMock = options.createNodeMock;
      }
      if (options.unstable_isConcurrent === true) {
        isConcurrent = true;
      }
    }
    var container = {
      children: [],
      createNodeMock: createNodeMock,
      tag: 'CONTAINER'
    };
    var root = createContainer(container, isConcurrent, false);
    !(root != null) ? reactProdInvariant('215') : void 0;
    updateContainer(element, root, null, null);

    var entry = {
      root: undefined, // makes flow happy
      // we define a 'getter' for 'root' below using 'Object.defineProperty'
      toJSON: function () {
        if (root == null || root.current == null || container == null) {
          return null;
        }
        if (container.children.length === 0) {
          return null;
        }
        if (container.children.length === 1) {
          return toJSON(container.children[0]);
        }
        if (container.children.length === 2 && container.children[0].isHidden === true && container.children[1].isHidden === false) {
          // Omit timed out children from output entirely, including the fact that we
          // temporarily wrap fallback and timed out children in an array.
          return toJSON(container.children[1]);
        }
        var renderedChildren = null;
        if (container.children && container.children.length) {
          for (var i = 0; i < container.children.length; i++) {
            var renderedChild = toJSON(container.children[i]);
            if (renderedChild !== null) {
              if (renderedChildren === null) {
                renderedChildren = [renderedChild];
              } else {
                renderedChildren.push(renderedChild);
              }
            }
          }
        }
        return renderedChildren;
      },
      toTree: function () {
        if (root == null || root.current == null) {
          return null;
        }
        return toTree(root.current);
      },
      update: function (newElement) {
        if (root == null || root.current == null) {
          return;
        }
        updateContainer(newElement, root, null, null);
      },
      unmount: function () {
        if (root == null || root.current == null) {
          return;
        }
        updateContainer(null, root, null, null);
        container = null;
        root = null;
      },
      getInstance: function () {
        if (root == null || root.current == null) {
          return null;
        }
        return getPublicRootInstance(root);
      },


      unstable_flushAll: flushAll,
      unstable_flushSync: function (fn) {
        clearYields();
        return flushSync(fn);
      },

      unstable_flushNumberOfYields: flushNumberOfYields,
      unstable_clearYields: clearYields
    };

    Object.defineProperty(entry, 'root', {
      configurable: true,
      enumerable: true,
      get: function () {
        if (root === null) {
          throw new Error("Can't access .root on unmounted test renderer");
        }
        var children = getChildren(root.current);
        if (children.length === 0) {
          throw new Error("Can't access .root on unmounted test renderer");
        } else if (children.length === 1) {
          // Normally, we skip the root and just give you the child.
          return children[0];
        } else {
          // However, we give you the root if there's more than one root child.
          // We could make this the behavior for all cases but it would be a breaking change.
          return wrapFiber(root.current);
        }
      }
    });

    return entry;
  },


  unstable_yield: yieldValue,
  unstable_clearYields: clearYields,

  /* eslint-disable camelcase */
  unstable_batchedUpdates: batchedUpdates,
  /* eslint-enable camelcase */

  unstable_setNowImplementation: setNowImplementation,

  act: function (callback) {
    // note: keep these warning messages in sync with
    // createNoop.js and ReactTestUtils.js
    var result = batchedUpdates(callback);
    flushPassiveEffects();
    // we want the user to not expect a return,
    // but we want to warn if they use it like they can await on it.
    return {
      then: function () {
        
      }
    };
  }
};

// root used to flush effects during .act() calls
var actRoot = createContainer({
  children: [],
  createNodeMock: defaultTestOptions.createNodeMock,
  tag: 'CONTAINER'
}, true, false);

function flushPassiveEffects() {
  // Trick to flush passive effects without exposing an internal API:
  // Create a throwaway root and schedule a dummy update on it.
  updateContainer(null, actRoot, null, null);
}

var fiberToWrapper = new WeakMap();
function wrapFiber(fiber) {
  var wrapper = fiberToWrapper.get(fiber);
  if (wrapper === undefined && fiber.alternate !== null) {
    wrapper = fiberToWrapper.get(fiber.alternate);
  }
  if (wrapper === undefined) {
    wrapper = new ReactTestInstance(fiber);
    fiberToWrapper.set(fiber, wrapper);
  }
  return wrapper;
}

// Enable ReactTestRenderer to be used to test DevTools integration.
injectIntoDevTools({
  findFiberByHostInstance: function () {
    throw new Error('TestRenderer does not support findFiberByHostInstance()');
  },
  bundleType: 0,
  version: ReactVersion,
  rendererPackageName: 'react-test-renderer'
});



var ReactTestRenderer = ({
	default: ReactTestRendererFiber
});

var ReactTestRenderer$1 = ( ReactTestRenderer && ReactTestRendererFiber ) || ReactTestRenderer;

// TODO: decide on the top-level export form.
// This is hacky but makes it work with both Rollup and Jest.
var reactTestRenderer = ReactTestRenderer$1.default || ReactTestRenderer$1;

export default reactTestRenderer;