react-pixi-fibre.js

var module = function(exports) {
  Object.defineProperty(exports, '__esModule', { value: true });

  /**
   * 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.
   *
   */

  /**
   * 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.
   */

  var validateFormat = function validateFormat(format) {};

  {
    validateFormat = function validateFormat(format) {
      if (format === undefined) {
        throw new Error('invariant requires an error message argument');
      }
    };
  }

  function invariant(condition, format, a, b, c, d, e, f) {
    validateFormat(format);

    if (!condition) {
      var error;
      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;
    }
  }

  var invariant_1 = invariant;

  var INJECTED_TYPES = {};

  function injectType(type, behavior) {
    INJECTED_TYPES[type] = behavior;
    return type;
  }

  function createInjectedTypeInstance(type, props, internalInstanceHandle, applyDisplayObjectProps) {
    var instance = void 0;

    if (type in INJECTED_TYPES) {
      var injectedType = INJECTED_TYPES[type];
      var customDisplayObject = void 0;
      if (typeof injectedType === "function") {
        customDisplayObject = injectedType;
      } else if (typeof injectedType.customDisplayObject === "function") {
        customDisplayObject = injectedType.customDisplayObject;
      }

      invariant_1(customDisplayObject, "Invalid Component injected to ReactPixiFiber: `%s`.", type);

      instance = customDisplayObject(props);

      if (typeof injectedType.customApplyProps === "function") {
        instance._customApplyProps = injectedType.customApplyProps.bind({
          // See: https://github.com/Izzimach/react-pixi/blob/a25196251a13ed9bb116a8576d93e9fceac2a14c/src/ReactPIXI.js#L953
          applyDisplayObjectProps: applyDisplayObjectProps.bind(null, instance)
        });
      }
      if (typeof injectedType.customDidAttach === "function") {
        instance._customDidAttach = injectedType.customDidAttach;
      }
      if (typeof injectedType.customWillDetach === "function") {
        instance._customWillDetach = injectedType.customWillDetach;
      }
    }

    return instance;
  }

  function isInjectedType(type) {
    return typeof INJECTED_TYPES[type] !== "undefined";
  }

  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
    return typeof obj;
  } : function (obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
  };

  var classCallCheck = function (instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  };

  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;
    };
  }();

  var defineProperty = function (obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  };

  var _extends = Object.assign || function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];

      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }

    return target;
  };

  var inherits = function (subClass, superClass) {
    if (typeof superClass !== "function" && superClass !== null) {
      throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
    }

    subClass.prototype = Object.create(superClass && superClass.prototype, {
      constructor: {
        value: subClass,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
    if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
  };

  var possibleConstructorReturn = function (self, call) {
    if (!self) {
      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
    }

    return call && (typeof call === "object" || typeof call === "function") ? call : self;
  };

  function CustomPIXIComponent(behavior, type) {
    invariant_1(typeof type === "string", "Invalid argument `type` of type `%s` supplied to `CustomPIXIComponent`, expected `string`.", typeof type === "undefined" ? "undefined" : _typeof(type));

    return injectType(type, behavior);
  }

  var name = "react-pixi-fiber";
  var version = "0.4.6";
  var description = "React Fiber renderer for PixiJS";
  var main = "index.js";
  var author = "Michal Ochman";
  var license = "MIT";
  var repository = "github:michalochman/react-pixi-fiber";
  var typings = "./index.d.ts";
  var files = ["LICENSE", "README.md", "index.d.ts", "index.js", "react-pixi-alias.js", "cjs/", "src/"];
  var dependencies = { "fbjs": "^0.8.0", "performance-now": "^2.1.0", "react-reconciler": "^0.10.0" };
  var peerDependencies = { "pixi.js": "^4.4.0", "react": "^16.0.0", "react-dom": "^16.0.0" };
  var devDependencies = { "@types/pixi.js": "^4.7.3", "@types/react": "^16.3.14", "babel-core": "^6.26.3", "babel-eslint": "^8.2.3", "babel-jest": "^22.4.3", "babel-plugin-external-helpers": "^6.22.0", "babel-plugin-rewire": "^1.1.0", "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2", "babel-plugin-transform-object-rest-spread": "^6.26.0", "babel-plugin-transform-react-jsx": "^6.24.1", "babel-preset-env": "^1.7.0", "canvas-prebuilt": "^1.6.5-prerelease.1", "codecov": "^3.0.2", "eslint": "^4.19.1", "eslint-config-prettier": "^2.9.0", "eslint-plugin-babel": "^5.1.0", "eslint-plugin-import": "^2.11.0", "eslint-plugin-prettier": "^2.6.0", "eslint-plugin-promise": "^3.7.0", "eslint-plugin-react": "^7.7.0", "jest": "^22.4.3", "pixi.js": "^4.4.0", "prettier": "^1.12.1", "react": "^16.0.0", "react-dom": "^16.0.0", "react-test-renderer": "^16.0.0", "rollup": "^0.58.2", "rollup-plugin-babel": "^3.0.4", "rollup-plugin-commonjs": "^9.1.3", "rollup-plugin-json": "^2.3.0", "rollup-plugin-node-globals": "^1.2.1", "rollup-plugin-node-resolve": "^3.3.0", "rollup-plugin-replace": "^2.0.0", "rollup-plugin-uglify": "^3.0.0", "rollup-plugin-visualizer": "^0.6.0" };
  var scripts = { "build": "npm run build:prod && npm run build:dev", "build:dev": "NODE_ENV=development rollup -c config/rollup.config.js", "build:prod": "NODE_ENV=production rollup -c config/rollup.config.js", "build:alias:dev": "NODE_ENV=development rollup -c config/rollup.config.js --environment entry:alias", "build:alias:prod": "NODE_ENV=production rollup -c config/rollup.config.js --environment entry:alias", "build:index:dev": "NODE_ENV=development rollup -c config/rollup.config.js --environment entry:index", "build:index:prod": "NODE_ENV=production rollup -c config/rollup.config.js --environment entry:index", "eslint": "eslint src", "eslint-check": "eslint --print-config .eslintrc.json | eslint-config-prettier-check", "prepublish": "npm run build", "test": "jest" };
  var jest = { "coverageDirectory": "coverage", "coverageReporters": ["lcov", "text-summary"], "collectCoverageFrom": ["src/**/*.js"], "globals": { "true": true }, "setupFiles": ["./test/jest.setupPixi.js"], "transform": { "^.+\\.js$": "babel-jest" } };
  var pkg = {
    name: name,
    version: version,
    description: description,
    main: main,
    author: author,
    license: license,
    repository: repository,
    typings: typings,
    files: files,
    dependencies: dependencies,
    peerDependencies: peerDependencies,
    devDependencies: devDependencies,
    scripts: scripts,
    jest: jest
  };

  var CHILDREN = "children";

  // List of props that should be handled in a specific way
  var RESERVED_PROPS = defineProperty({}, CHILDREN, true);

  // List of default values for DisplayObject members
  var DEFAULT_PROPS = {
    alpha: 1,
    buttonMode: false,
    cacheAsBitmap: false,
    cursor: "auto",
    filterArea: null,
    filters: null,
    hitArea: null,
    interactive: false,
    // localTransform  // readonly
    mask: null,
    // TODO move parent to RESERVED_PROPS?
    // parent  // readonly
    pivot: 0,
    position: 0,
    renderable: true,
    rotation: 0,
    scale: 1,
    skew: 0,
    transform: null,
    visible: true,
    // worldAlpha  // readonly
    // worldTransform  // readonly
    // worldVisible  // readonly
    x: 0,
    y: 0
  };

  var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

  function createCommonjsModule(fn, module) {
    return module = { exports: {} }, fn(module, module.exports), module.exports;
  }

  /*
  object-assign
  (c) Sindre Sorhus
  @license MIT
  */
  /* eslint-disable no-unused-vars */
  var getOwnPropertySymbols = Object.getOwnPropertySymbols;
  var hasOwnProperty = Object.prototype.hasOwnProperty;
  var propIsEnumerable = Object.prototype.propertyIsEnumerable;

  function toObject(val) {
    if (val === null || val === undefined) {
      throw new TypeError('Object.assign cannot be called with null or undefined');
    }

    return Object(val);
  }

  function shouldUseNative() {
    try {
      if (!Object.assign) {
        return false;
      }

      // Detect buggy property enumeration order in older V8 versions.

      // https://bugs.chromium.org/p/v8/issues/detail?id=4118
      var test1 = new String('abc');  // eslint-disable-line no-new-wrappers
      test1[5] = 'de';
      if (Object.getOwnPropertyNames(test1)[0] === '5') {
        return false;
      }

      // https://bugs.chromium.org/p/v8/issues/detail?id=3056
      var test2 = {};
      for (var i = 0; i < 10; i++) {
        test2['_' + String.fromCharCode(i)] = i;
      }
      var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
        return test2[n];
      });
      if (order2.join('') !== '0123456789') {
        return false;
      }

      // https://bugs.chromium.org/p/v8/issues/detail?id=3056
      var test3 = {};
      'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
        test3[letter] = letter;
      });
      if (Object.keys(Object.assign({}, test3)).join('') !==
          'abcdefghijklmnopqrst') {
        return false;
      }

      return true;
    } catch (err) {
      // We don't expect any of the above to throw, but better to be safe.
      return false;
    }
  }

  var objectAssign = shouldUseNative() ? Object.assign : function (target, source) {
    var from;
    var to = toObject(target);
    var symbols;

    for (var s = 1; s < arguments.length; s++) {
      from = Object(arguments[s]);

      for (var key in from) {
        if (hasOwnProperty.call(from, key)) {
          to[key] = from[key];
        }
      }

      if (getOwnPropertySymbols) {
        symbols = getOwnPropertySymbols(from);
        for (var i = 0; i < symbols.length; i++) {
          if (propIsEnumerable.call(from, symbols[i])) {
            to[symbols[i]] = from[symbols[i]];
          }
        }
      }
    }

    return to;
  };

  /**
   * 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.
   *
   * 
   */

  function makeEmptyFunction(arg) {
    return function () {
      return arg;
    };
  }

  /**
   * This function accepts and discards inputs; it has no side effects. This is
   * primarily useful idiomatically for overridable function endpoints which
   * always need to be callable, since JS lacks a null-call idiom ala Cocoa.
   */
  var emptyFunction = function emptyFunction() {};

  emptyFunction.thatReturns = makeEmptyFunction;
  emptyFunction.thatReturnsFalse = makeEmptyFunction(false);
  emptyFunction.thatReturnsTrue = makeEmptyFunction(true);
  emptyFunction.thatReturnsNull = makeEmptyFunction(null);
  emptyFunction.thatReturnsThis = function () {
    return this;
  };
  emptyFunction.thatReturnsArgument = function (arg) {
    return arg;
  };

  var emptyFunction_1 = emptyFunction;

  /**
   * 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.
   */

  var warning = emptyFunction_1;

  {
    var printWarning = function printWarning(format) {
      for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        args[_key - 1] = arguments[_key];
      }

      var argIndex = 0;
      var message = 'Warning: ' + format.replace(/%s/g, function () {
        return args[argIndex++];
      });
      if (typeof console !== 'undefined') {
        console.error(message);
      }
      try {
        // --- Welcome to debugging React ---
        // This error was thrown as a convenience so that you can use this stack
        // to find the callsite that caused this warning to fire.
        throw new Error(message);
      } catch (x) {}
    };

    warning = function warning(condition, format) {
      if (format === undefined) {
        throw new Error('`warning(condition, format, ...args)` requires a warning ' + 'message argument');
      }

      if (format.indexOf('Failed Composite propType: ') === 0) {
        return; // Ignore CompositeComponent proptype check.
      }

      if (!condition) {
        for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
          args[_key2 - 2] = arguments[_key2];
        }

        printWarning.apply(undefined, [format].concat(args));
      }
    };
  }

  var warning_1 = warning;

  /**
   * 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 emptyObject = {};

  {
    Object.freeze(emptyObject);
  }

  var emptyObject_1 = emptyObject;

  /**
   * 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.
   *
   * @typechecks
   * 
   */

  var hasOwnProperty$1 = Object.prototype.hasOwnProperty;

  /**
   * 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) {
    // SameValue algorithm
    if (x === y) {
      // Steps 1-5, 7-10
      // Steps 6.b-6.e: +0 != -0
      // Added the nonzero y check to make Flow happy, but it is redundant
      return x !== 0 || y !== 0 || 1 / x === 1 / y;
    } else {
      // Step 6.a: NaN == NaN
      return x !== x && y !== y;
    }
  }

  /**
   * 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$1.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
        return false;
      }
    }

    return true;
  }

  var shallowEqual_1 = shallowEqual;

  /**
   * 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 ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';

  var ReactPropTypesSecret_1 = ReactPropTypesSecret;

  {
    var invariant$1 = invariant_1;
    var warning$1 = warning_1;
    var ReactPropTypesSecret$1 = ReactPropTypesSecret_1;
    var loggedTypeFailures = {};
  }

  /**
   * Assert that the values match with the type specs.
   * Error messages are memorized and will only be shown once.
   *
   * @param {object} typeSpecs Map of name to a ReactPropType
   * @param {object} values Runtime values that need to be type-checked
   * @param {string} location e.g. "prop", "context", "child context"
   * @param {string} componentName Name of the component for error messages.
   * @param {?Function} getStack Returns the component stack.
   * @private
   */
  function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
    {
      for (var typeSpecName in typeSpecs) {
        if (typeSpecs.hasOwnProperty(typeSpecName)) {
          var error;
          // Prop type validation may throw. In case they do, we don't want to
          // fail the render phase where it didn't fail before. So we log it.
          // After these have been cleaned up, we'll let them throw.
          try {
            // This is intentionally an invariant that gets caught. It's the same
            // behavior as without this statement except with a better message.
            invariant$1(typeof typeSpecs[typeSpecName] === 'function', '%s: %s type `%s` is invalid; it must be a function, usually from ' + 'the `prop-types` package, but received `%s`.', componentName || 'React class', location, typeSpecName, typeof typeSpecs[typeSpecName]);
            error = typeSpecs[typeSpecName](values, typeSpecName, componentName, location, null, ReactPropTypesSecret$1);
          } catch (ex) {
            error = ex;
          }
          warning$1(!error || error instanceof Error, '%s: type specification of %s `%s` is invalid; the type checker ' + 'function must return `null` or an `Error` but returned a %s. ' + 'You may have forgotten to pass an argument to the type checker ' + 'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' + 'shape all require an argument).', componentName || 'React class', location, typeSpecName, typeof error);
          if (error instanceof Error && !(error.message in loggedTypeFailures)) {
            // Only monitor this failure once because there tends to be a lot of the
            // same error.
            loggedTypeFailures[error.message] = true;

            var stack = getStack ? getStack() : '';

            warning$1(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '');
          }
        }
      }
    }
  }

  var checkPropTypes_1 = checkPropTypes;

  var reactReconciler_development = createCommonjsModule(function (module) {

  {
    // This is a hacky way to ensure third party renderers don't share
    // top-level module state inside the reconciler. Ideally we should
    // remove this hack by putting all top-level state into the closures
    // and then forbidding adding more of it in the reconciler.
    var $$$reconciler;
    module.exports = function(config) {

  var _assign = objectAssign;
  var invariant = invariant_1;
  var warning = warning_1;
  var React$$1 = React;
  var emptyObject = emptyObject_1;
  var shallowEqual = shallowEqual_1;
  var checkPropTypes = checkPropTypes_1;

  // Relying on the `invariant()` implementation lets us
  // have preserve the format and params in the www builds.

  /**
   * `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 ReactInternals = React$$1.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

  var ReactCurrentOwner = ReactInternals.ReactCurrentOwner;
  var ReactDebugCurrentFrame = ReactInternals.ReactDebugCurrentFrame;

  // 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_CALL_TYPE = hasSymbol ? Symbol['for']('react.call') : 0xeac8;
  var REACT_RETURN_TYPE = hasSymbol ? Symbol['for']('react.return') : 0xeac9;
  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_PROVIDER_TYPE = hasSymbol ? Symbol['for']('react.provider') : 0xeacd;
  var REACT_CONTEXT_TYPE = hasSymbol ? Symbol['for']('react.context') : 0xeace;
  var REACT_ASYNC_MODE_TYPE = hasSymbol ? Symbol['for']('react.async_mode') : 0xeacf;
  var REACT_FORWARD_REF_TYPE = hasSymbol ? Symbol['for']('react.forward_ref') : 0xead0;

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

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

  function getComponentName(fiber) {
    var type = fiber.type;

    if (typeof type === 'function') {
      return type.displayName || type.name;
    }
    if (typeof type === 'string') {
      return type;
    }
    switch (type) {
      case REACT_FRAGMENT_TYPE:
        return 'ReactFragment';
      case REACT_PORTAL_TYPE:
        return 'ReactPortal';
      case REACT_CALL_TYPE:
        return 'ReactCall';
      case REACT_RETURN_TYPE:
        return 'ReactReturn';
    }
    if (typeof type === 'object' && type !== null) {
      switch (type.$$typeof) {
        case REACT_FORWARD_REF_TYPE:
          var functionName = type.render.displayName || type.render.name || '';
          return functionName !== '' ? 'ForwardRef(' + functionName + ')' : 'ForwardRef';
      }
    }
    return null;
  }

  var IndeterminateComponent = 0; // Before we know whether it is functional or class
  var FunctionalComponent = 1;
  var ClassComponent = 2;
  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 CallComponent = 7;
  var CallHandlerPhase = 8;
  var ReturnComponent = 9;
  var Fragment = 10;
  var Mode = 11;
  var ContextConsumer = 12;
  var ContextProvider = 13;
  var ForwardRef = 14;

  // 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 ErrLog = /*                */256;
  var Snapshot = /*              */2048;

  // Union of all host effects
  var HostEffectMask = /*        */2559;

  var Incomplete = /*            */512;
  var ShouldCapture = /*         */1024;

  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 owner = ReactCurrentOwner.current;
      if (owner !== null && owner.tag === ClassComponent) {
        var ownerFiber = owner;
        var instance = ownerFiber.stateNode;
        !instance._warnedAboutRefsInRender ? warning(false, '%s is accessing isMounted inside its render() function. ' + 'render() should be a pure function of props and state. It should ' + 'never access something that requires stale data from the previous ' + 'render, such as refs. Move this logic to componentDidMount and ' + 'componentDidUpdate instead.', getComponentName(ownerFiber) || 'A component') : void 0;
        instance._warnedAboutRefsInRender = true;
      }
    }

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

  function assertIsMounted(fiber) {
    !(isFiberMountedImpl(fiber) === MOUNTED) ? invariant(false, 'Unable to find node on an unmounted component.') : 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) ? invariant(false, 'Unable to find node on an unmounted component.') : 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.
        invariant(false, 'Unable to find node on an unmounted component.');
      }

      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 ? invariant(false, 'Child was not found in either parent set. This indicates a bug in React related to the return pointer. Please file an issue.') : void 0;
        }
      }

      !(a.alternate === b) ? invariant(false, 'Return fibers should always be each others\' alternates. This error is likely caused by a bug in React. Please file an issue.') : void 0;
    }
    // If the root is not a host container, we're in a disconnected tree. I.e.
    // unmounted.
    !(a.tag === HostRoot) ? invariant(false, 'Unable to find node on an unmounted component.') : 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;
  }

  function findCurrentHostFiberWithNoPortals(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.tag !== HostPortal) {
        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;
  }

  // Max 31 bit integer. The max integer size in V8 for 32-bit systems.
  // Math.pow(2, 30) - 1
  // 0b111111111111111111111111111111
  var MAX_SIGNED_31_BIT_INT = 1073741823;

  // TODO: Use an opaque type once ESLint et al support the syntax


  var NoWork = 0;
  var Sync = 1;
  var Never = MAX_SIGNED_31_BIT_INT;

  var UNIT_SIZE = 10;
  var MAGIC_NUMBER_OFFSET = 2;

  // 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 (ms / UNIT_SIZE | 0) + MAGIC_NUMBER_OFFSET;
  }

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

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

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

  var NoContext = 0;
  var AsyncMode = 1;
  var StrictMode = 2;

  var hasBadMapPolyfill = void 0;

  {
    hasBadMapPolyfill = false;
    try {
      var nonExtensibleObject = Object.preventExtensions({});
      var testMap = new Map([[nonExtensibleObject, null]]);
      var testSet = new Set([nonExtensibleObject]);
      // This is necessary for Rollup to not consider these unused.
      // https://github.com/rollup/rollup/issues/1771
      // TODO: we can remove these if Rollup fixes the bug.
      testMap.set(0, 0);
      testSet.add(0);
    } catch (e) {
      // TODO: Consider warning about bad polyfills
      hasBadMapPolyfill = true;
    }
  }

  // A Fiber is work on a Component that needs to be done or was done. There can
  // be more than one per component.


  var debugCounter = void 0;

  {
    debugCounter = 1;
  }

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

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

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

    this.expirationTime = NoWork;

    this.alternate = null;

    {
      this._debugID = debugCounter++;
      this._debugSource = null;
      this._debugOwner = null;
      this._debugIsCurrentlyTiming = false;
      if (!hasBadMapPolyfill && typeof Object.preventExtensions === 'function') {
        Object.preventExtensions(this);
      }
    }
  }

  // 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) {
    return !!(Component.prototype && Component.prototype.isReactComponent);
  }

  // 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.type = current.type;
      workInProgress.stateNode = current.stateNode;

      {
        // DEV-only fields
        workInProgress._debugID = current._debugID;
        workInProgress._debugSource = current._debugSource;
        workInProgress._debugOwner = current._debugOwner;
      }

      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;
    }

    workInProgress.expirationTime = expirationTime;

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

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

    return workInProgress;
  }

  function createHostRootFiber(isAsync) {
    var mode = isAsync ? AsyncMode | StrictMode : NoContext;
    return createFiber(HostRoot, null, null, mode);
  }

  function createFiberFromElement(element, mode, expirationTime) {
    var owner = null;
    {
      owner = element._owner;
    }

    var fiber = void 0;
    var type = element.type;
    var key = element.key;
    var pendingProps = element.props;

    var fiberTag = void 0;
    if (typeof type === 'function') {
      fiberTag = shouldConstruct(type) ? ClassComponent : IndeterminateComponent;
    } else if (typeof type === 'string') {
      fiberTag = HostComponent;
    } else {
      switch (type) {
        case REACT_FRAGMENT_TYPE:
          return createFiberFromFragment(pendingProps.children, mode, expirationTime, key);
        case REACT_ASYNC_MODE_TYPE:
          fiberTag = Mode;
          mode |= AsyncMode | StrictMode;
          break;
        case REACT_STRICT_MODE_TYPE:
          fiberTag = Mode;
          mode |= StrictMode;
          break;
        case REACT_CALL_TYPE:
          fiberTag = CallComponent;
          break;
        case REACT_RETURN_TYPE:
          fiberTag = ReturnComponent;
          break;
        default:
          {
            if (typeof type === 'object' && type !== null) {
              switch (type.$$typeof) {
                case REACT_PROVIDER_TYPE:
                  fiberTag = ContextProvider;
                  break;
                case REACT_CONTEXT_TYPE:
                  // This is a consumer
                  fiberTag = ContextConsumer;
                  break;
                case REACT_FORWARD_REF_TYPE:
                  fiberTag = ForwardRef;
                  break;
                default:
                  if (typeof type.tag === 'number') {
                    // Currently assumed to be a continuation and therefore is a
                    // fiber already.
                    // TODO: The yield system is currently broken for updates in
                    // some cases. The reified yield stores a fiber, but we don't
                    // know which fiber that is; the current or a workInProgress?
                    // When the continuation gets rendered here we don't know if we
                    // can reuse that fiber or if we need to clone it. There is
                    // probably a clever way to restructure this.
                    fiber = type;
                    fiber.pendingProps = pendingProps;
                    fiber.expirationTime = expirationTime;
                    return fiber;
                  } else {
                    throwOnInvalidElementType(type, owner);
                  }
                  break;
              }
            } else {
              throwOnInvalidElementType(type, owner);
            }
          }
      }
    }

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

    {
      fiber._debugSource = element._source;
      fiber._debugOwner = element._owner;
    }

    return fiber;
  }

  function throwOnInvalidElementType(type, owner) {
    var info = '';
    {
      if (type === undefined || typeof type === 'object' && type !== null && Object.keys(type).length === 0) {
        info += ' You likely forgot to export your component from the file ' + "it's defined in, or you might have mixed up default and " + 'named imports.';
      }
      var ownerName = owner ? getComponentName(owner) : null;
      if (ownerName) {
        info += '\n\nCheck the render method of `' + ownerName + '`.';
      }
    }
    invariant(false, 'Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: %s.%s', type == null ? type : typeof type, info);
  }

  function createFiberFromFragment(elements, mode, expirationTime, key) {
    var fiber = createFiber(Fragment, elements, key, mode);
    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);
    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.
  function assignFiberPropertiesInDEV(target, source) {
    if (target === null) {
      // This Fiber's initial properties will always be overwritten.
      // We only use a Fiber to ensure the same hidden class so DEV isn't slow.
      target = createFiber(IndeterminateComponent, null, null, NoContext);
    }

    // This is intentionally written as a list of all properties.
    // We tried to use Object.assign() instead but this is called in
    // the hottest path, and Object.assign() was too slow:
    // https://github.com/facebook/react/issues/12502
    // This code is DEV-only so size is not a concern.

    target.tag = source.tag;
    target.key = source.key;
    target.type = source.type;
    target.stateNode = source.stateNode;
    target['return'] = source['return'];
    target.child = source.child;
    target.sibling = source.sibling;
    target.index = source.index;
    target.ref = source.ref;
    target.pendingProps = source.pendingProps;
    target.memoizedProps = source.memoizedProps;
    target.updateQueue = source.updateQueue;
    target.memoizedState = source.memoizedState;
    target.mode = source.mode;
    target.effectTag = source.effectTag;
    target.nextEffect = source.nextEffect;
    target.firstEffect = source.firstEffect;
    target.lastEffect = source.lastEffect;
    target.expirationTime = source.expirationTime;
    target.alternate = source.alternate;
    target._debugID = source._debugID;
    target._debugSource = source._debugSource;
    target._debugOwner = source._debugOwner;
    target._debugIsCurrentlyTiming = source._debugIsCurrentlyTiming;
    return target;
  }

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


  function createFiberRoot(containerInfo, isAsync, hydrate) {
    // Cyclic construction. This cheats the type system right now because
    // stateNode is any.
    var uninitializedFiber = createHostRootFiber(isAsync);
    var root = {
      current: uninitializedFiber,
      containerInfo: containerInfo,
      pendingChildren: null,
      pendingCommitExpirationTime: NoWork,
      finishedWork: null,
      context: null,
      pendingContext: null,
      hydrate: hydrate,
      remainingExpirationTime: NoWork,
      firstBatch: null,
      nextScheduledRoot: null
    };
    uninitializedFiber.stateNode = root;
    return root;
  }

  var onCommitFiberRoot = null;
  var onCommitFiberUnmount = null;
  var hasLoggedError = false;

  function catchErrors(fn) {
    return function (arg) {
      try {
        return fn(arg);
      } catch (err) {
        if (!hasLoggedError) {
          hasLoggedError = true;
          warning(false, 'React DevTools encountered an error: %s', err);
        }
      }
    };
  }

  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) {
      {
        warning(false, 'The installed version of React DevTools is too old and will not work ' + 'with the current version of React. Please update React DevTools. ' + 'https://fb.me/react-devtools');
      }
      // DevTools exists, even though it doesn't support Fiber.
      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.
      {
        warning(false, 'React DevTools encountered an error: %s.', err);
      }
    }
    // DevTools exists
    return true;
  }

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

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

  var invokeGuardedCallback$1 = function (name, func, context, a, b, c, d, e, f) {
    this._hasCaughtError = false;
    this._caughtError = null;
    var funcArgs = Array.prototype.slice.call(arguments, 3);
    try {
      func.apply(context, funcArgs);
    } catch (error) {
      this._caughtError = error;
      this._hasCaughtError = true;
    }
  };

  {
    // In DEV mode, we swap out invokeGuardedCallback for a special version
    // that plays more nicely with the browser's DevTools. The idea is to preserve
    // "Pause on exceptions" behavior. Because React wraps all user-provided
    // functions in invokeGuardedCallback, and the production version of
    // invokeGuardedCallback uses a try-catch, all user exceptions are treated
    // like caught exceptions, and the DevTools won't pause unless the developer
    // takes the extra step of enabling pause on caught exceptions. This is
    // untintuitive, though, because even though React has caught the error, from
    // the developer's perspective, the error is uncaught.
    //
    // To preserve the expected "Pause on exceptions" behavior, we don't use a
    // try-catch in DEV. Instead, we synchronously dispatch a fake event to a fake
    // DOM node, and call the user-provided callback from inside an event handler
    // for that fake event. If the callback throws, the error is "captured" using
    // a global event handler. But because the error happens in a different
    // event loop context, it does not interrupt the normal program flow.
    // Effectively, this gives us try-catch behavior without actually using
    // try-catch. Neat!

    // Check that the browser supports the APIs we need to implement our special
    // DEV version of invokeGuardedCallback
    if (typeof window !== 'undefined' && typeof window.dispatchEvent === 'function' && typeof document !== 'undefined' && typeof document.createEvent === 'function') {
      var fakeNode = document.createElement('react');

      var invokeGuardedCallbackDev = function (name, func, context, a, b, c, d, e, f) {
        // If document doesn't exist we know for sure we will crash in this method
        // when we call document.createEvent(). However this can cause confusing
        // errors: https://github.com/facebookincubator/create-react-app/issues/3482
        // So we preemptively throw with a better message instead.
        !(typeof document !== 'undefined') ? invariant(false, 'The `document` global was defined when React was initialized, but is not defined anymore. This can happen in a test environment if a component schedules an update from an asynchronous callback, but the test has already finished running. To solve this, you can either unmount the component at the end of your test (and ensure that any asynchronous operations get canceled in `componentWillUnmount`), or you can change the test itself to be asynchronous.') : void 0;
        var evt = document.createEvent('Event');

        // Keeps track of whether the user-provided callback threw an error. We
        // set this to true at the beginning, then set it to false right after
        // calling the function. If the function errors, `didError` will never be
        // set to false. This strategy works even if the browser is flaky and
        // fails to call our global error handler, because it doesn't rely on
        // the error event at all.
        var didError = true;

        // Create an event handler for our fake event. We will synchronously
        // dispatch our fake event using `dispatchEvent`. Inside the handler, we
        // call the user-provided callback.
        var funcArgs = Array.prototype.slice.call(arguments, 3);
        function callCallback() {
          // We immediately remove the callback from event listeners so that
          // nested `invokeGuardedCallback` calls do not clash. Otherwise, a
          // nested call would trigger the fake event handlers of any call higher
          // in the stack.
          fakeNode.removeEventListener(evtType, callCallback, false);
          func.apply(context, funcArgs);
          didError = false;
        }

        // Create a global error event handler. We use this to capture the value
        // that was thrown. It's possible that this error handler will fire more
        // than once; for example, if non-React code also calls `dispatchEvent`
        // and a handler for that event throws. We should be resilient to most of
        // those cases. Even if our error event handler fires more than once, the
        // last error event is always used. If the callback actually does error,
        // we know that the last error event is the correct one, because it's not
        // possible for anything else to have happened in between our callback
        // erroring and the code that follows the `dispatchEvent` call below. If
        // the callback doesn't error, but the error event was fired, we know to
        // ignore it because `didError` will be false, as described above.
        var error = void 0;
        // Use this to track whether the error event is ever called.
        var didSetError = false;
        var isCrossOriginError = false;

        function onError(event) {
          error = event.error;
          didSetError = true;
          if (error === null && event.colno === 0 && event.lineno === 0) {
            isCrossOriginError = true;
          }
        }

        // Create a fake event type.
        var evtType = 'react-' + (name ? name : 'invokeguardedcallback');

        // Attach our event handlers
        window.addEventListener('error', onError);
        fakeNode.addEventListener(evtType, callCallback, false);

        // Synchronously dispatch our fake event. If the user-provided function
        // errors, it will trigger our global error handler.
        evt.initEvent(evtType, false, false);
        fakeNode.dispatchEvent(evt);

        if (didError) {
          if (!didSetError) {
            // The callback errored, but the error event never fired.
            error = new Error('An error was thrown inside one of your components, but React ' + "doesn't know what it was. This is likely due to browser " + 'flakiness. React does its best to preserve the "Pause on ' + 'exceptions" behavior of the DevTools, which requires some ' + "DEV-mode only tricks. It's possible that these don't work in " + 'your browser. Try triggering the error in production mode, ' + 'or switching to a modern browser. If you suspect that this is ' + 'actually an issue with React, please file an issue.');
          } else if (isCrossOriginError) {
            error = new Error("A cross-origin error was thrown. React doesn't have access to " + 'the actual error object in development. ' + 'See https://fb.me/react-crossorigin-error for more information.');
          }
          this._hasCaughtError = true;
          this._caughtError = error;
        } else {
          this._hasCaughtError = false;
          this._caughtError = null;
        }

        // Remove our event listeners
        window.removeEventListener('error', onError);
      };

      invokeGuardedCallback$1 = invokeGuardedCallbackDev;
    }
  }

  var invokeGuardedCallback$2 = invokeGuardedCallback$1;

  var ReactErrorUtils = {
    // Used by Fiber to simulate a try-catch.
    _caughtError: null,
    _hasCaughtError: false,

    // Used by event system to capture/rethrow the first error.
    _rethrowError: null,
    _hasRethrowError: false,

    /**
     * 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
     */
    invokeGuardedCallback: function (name, func, context, a, b, c, d, e, f) {
      invokeGuardedCallback$2.apply(ReactErrorUtils, arguments);
    },

    /**
     * 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
     */
    invokeGuardedCallbackAndCatchFirstError: function (name, func, context, a, b, c, d, e, f) {
      ReactErrorUtils.invokeGuardedCallback.apply(this, arguments);
      if (ReactErrorUtils.hasCaughtError()) {
        var error = ReactErrorUtils.clearCaughtError();
        if (!ReactErrorUtils._hasRethrowError) {
          ReactErrorUtils._hasRethrowError = true;
          ReactErrorUtils._rethrowError = error;
        }
      }
    },

    /**
     * During execution of guarded functions we will capture the first error which
     * we will rethrow to be handled by the top level error handler.
     */
    rethrowCaughtError: function () {
      return rethrowCaughtError.apply(ReactErrorUtils, arguments);
    },

    hasCaughtError: function () {
      return ReactErrorUtils._hasCaughtError;
    },

    clearCaughtError: function () {
      if (ReactErrorUtils._hasCaughtError) {
        var error = ReactErrorUtils._caughtError;
        ReactErrorUtils._caughtError = null;
        ReactErrorUtils._hasCaughtError = false;
        return error;
      } else {
        invariant(false, 'clearCaughtError was called but no error was captured. This error is likely caused by a bug in React. Please file an issue.');
      }
    }
  };

  var rethrowCaughtError = function () {
    if (ReactErrorUtils._hasRethrowError) {
      var error = ReactErrorUtils._rethrowError;
      ReactErrorUtils._rethrowError = null;
      ReactErrorUtils._hasRethrowError = false;
      throw error;
    }
  };

  var describeComponentFrame = function (name, source, ownerName) {
    return '\n    in ' + (name || 'Unknown') + (source ? ' (at ' + source.fileName.replace(/^.*[\\\/]/, '') + ':' + source.lineNumber + ')' : ownerName ? ' (created by ' + ownerName + ')' : '');
  };

  function describeFiber(fiber) {
    switch (fiber.tag) {
      case IndeterminateComponent:
      case FunctionalComponent:
      case ClassComponent:
      case HostComponent:
        var owner = fiber._debugOwner;
        var source = fiber._debugSource;
        var name = getComponentName(fiber);
        var ownerName = null;
        if (owner) {
          ownerName = getComponentName(owner);
        }
        return describeComponentFrame(name, source, ownerName);
      default:
        return '';
    }
  }

  // This function can only be called with a work-in-progress fiber and
  // only during begin or complete phase. Do not call it under any other
  // circumstances.
  function getStackAddendumByWorkInProgressFiber(workInProgress) {
    var info = '';
    var node = workInProgress;
    do {
      info += describeFiber(node);
      // Otherwise this return pointer might point to the wrong tree:
      node = node['return'];
    } while (node);
    return info;
  }

  /**
   * 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.
   */

  var lowPriorityWarning = function () {};

  {
    var printWarning = function (format) {
      for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        args[_key - 1] = arguments[_key];
      }

      var argIndex = 0;
      var message = 'Warning: ' + format.replace(/%s/g, function () {
        return args[argIndex++];
      });
      if (typeof console !== 'undefined') {
        console.warn(message);
      }
      try {
        // --- Welcome to debugging React ---
        // This error was thrown as a convenience so that you can use this stack
        // to find the callsite that caused this warning to fire.
        throw new Error(message);
      } catch (x) {}
    };

    lowPriorityWarning = function (condition, format) {
      if (format === undefined) {
        throw new Error('`warning(condition, format, ...args)` requires a warning ' + 'message argument');
      }
      if (!condition) {
        for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
          args[_key2 - 2] = arguments[_key2];
        }

        printWarning.apply(undefined, [format].concat(args));
      }
    };
  }

  var lowPriorityWarning$1 = lowPriorityWarning;

  var ReactStrictModeWarnings = {
    discardPendingWarnings: function () {},
    flushPendingDeprecationWarnings: function () {},
    flushPendingUnsafeLifecycleWarnings: function () {},
    recordDeprecationWarnings: function (fiber, instance) {},
    recordUnsafeLifecycleWarnings: function (fiber, instance) {}
  };

  {
    var LIFECYCLE_SUGGESTIONS = {
      UNSAFE_componentWillMount: 'componentDidMount',
      UNSAFE_componentWillReceiveProps: 'static getDerivedStateFromProps',
      UNSAFE_componentWillUpdate: 'componentDidUpdate'
    };

    var pendingComponentWillMountWarnings = [];
    var pendingComponentWillReceivePropsWarnings = [];
    var pendingComponentWillUpdateWarnings = [];
    var pendingUnsafeLifecycleWarnings = new Map();

    // Tracks components we have already warned about.
    var didWarnAboutDeprecatedLifecycles = new Set();
    var didWarnAboutUnsafeLifecycles = new Set();

    var setToSortedString = function (set) {
      var array = [];
      set.forEach(function (value) {
        array.push(value);
      });
      return array.sort().join(', ');
    };

    ReactStrictModeWarnings.discardPendingWarnings = function () {
      pendingComponentWillMountWarnings = [];
      pendingComponentWillReceivePropsWarnings = [];
      pendingComponentWillUpdateWarnings = [];
      pendingUnsafeLifecycleWarnings = new Map();
    };

    ReactStrictModeWarnings.flushPendingUnsafeLifecycleWarnings = function () {
      pendingUnsafeLifecycleWarnings.forEach(function (lifecycleWarningsMap, strictRoot) {
        var lifecyclesWarningMesages = [];

        Object.keys(lifecycleWarningsMap).forEach(function (lifecycle) {
          var lifecycleWarnings = lifecycleWarningsMap[lifecycle];
          if (lifecycleWarnings.length > 0) {
            var componentNames = new Set();
            lifecycleWarnings.forEach(function (fiber) {
              componentNames.add(getComponentName(fiber) || 'Component');
              didWarnAboutUnsafeLifecycles.add(fiber.type);
            });

            var formatted = lifecycle.replace('UNSAFE_', '');
            var suggestion = LIFECYCLE_SUGGESTIONS[lifecycle];
            var sortedComponentNames = setToSortedString(componentNames);

            lifecyclesWarningMesages.push(formatted + ': Please update the following components to use ' + (suggestion + ' instead: ' + sortedComponentNames));
          }
        });

        if (lifecyclesWarningMesages.length > 0) {
          var strictRootComponentStack = getStackAddendumByWorkInProgressFiber(strictRoot);

          warning(false, 'Unsafe lifecycle methods were found within a strict-mode tree:%s' + '\n\n%s' + '\n\nLearn more about this warning here:' + '\nhttps://fb.me/react-strict-mode-warnings', strictRootComponentStack, lifecyclesWarningMesages.join('\n\n'));
        }
      });

      pendingUnsafeLifecycleWarnings = new Map();
    };

    var getStrictRoot = function (fiber) {
      var maybeStrictRoot = null;

      while (fiber !== null) {
        if (fiber.mode & StrictMode) {
          maybeStrictRoot = fiber;
        }

        fiber = fiber['return'];
      }

      return maybeStrictRoot;
    };

    ReactStrictModeWarnings.flushPendingDeprecationWarnings = function () {
      if (pendingComponentWillMountWarnings.length > 0) {
        var uniqueNames = new Set();
        pendingComponentWillMountWarnings.forEach(function (fiber) {
          uniqueNames.add(getComponentName(fiber) || 'Component');
          didWarnAboutDeprecatedLifecycles.add(fiber.type);
        });

        var sortedNames = setToSortedString(uniqueNames);

        lowPriorityWarning$1(false, 'componentWillMount is deprecated and will be removed in the next major version. ' + 'Use componentDidMount instead. As a temporary workaround, ' + 'you can rename to UNSAFE_componentWillMount.' + '\n\nPlease update the following components: %s' + '\n\nLearn more about this warning here:' + '\nhttps://fb.me/react-async-component-lifecycle-hooks', sortedNames);

        pendingComponentWillMountWarnings = [];
      }

      if (pendingComponentWillReceivePropsWarnings.length > 0) {
        var _uniqueNames = new Set();
        pendingComponentWillReceivePropsWarnings.forEach(function (fiber) {
          _uniqueNames.add(getComponentName(fiber) || 'Component');
          didWarnAboutDeprecatedLifecycles.add(fiber.type);
        });

        var _sortedNames = setToSortedString(_uniqueNames);

        lowPriorityWarning$1(false, 'componentWillReceiveProps is deprecated and will be removed in the next major version. ' + 'Use static getDerivedStateFromProps instead.' + '\n\nPlease update the following components: %s' + '\n\nLearn more about this warning here:' + '\nhttps://fb.me/react-async-component-lifecycle-hooks', _sortedNames);

        pendingComponentWillReceivePropsWarnings = [];
      }

      if (pendingComponentWillUpdateWarnings.length > 0) {
        var _uniqueNames2 = new Set();
        pendingComponentWillUpdateWarnings.forEach(function (fiber) {
          _uniqueNames2.add(getComponentName(fiber) || 'Component');
          didWarnAboutDeprecatedLifecycles.add(fiber.type);
        });

        var _sortedNames2 = setToSortedString(_uniqueNames2);

        lowPriorityWarning$1(false, 'componentWillUpdate is deprecated and will be removed in the next major version. ' + 'Use componentDidUpdate instead. As a temporary workaround, ' + 'you can rename to UNSAFE_componentWillUpdate.' + '\n\nPlease update the following components: %s' + '\n\nLearn more about this warning here:' + '\nhttps://fb.me/react-async-component-lifecycle-hooks', _sortedNames2);

        pendingComponentWillUpdateWarnings = [];
      }
    };

    ReactStrictModeWarnings.recordDeprecationWarnings = function (fiber, instance) {
      // Dedup strategy: Warn once per component.
      if (didWarnAboutDeprecatedLifecycles.has(fiber.type)) {
        return;
      }

      // Don't warn about react-lifecycles-compat polyfilled components.
      if (typeof instance.componentWillMount === 'function' && instance.componentWillMount.__suppressDeprecationWarning !== true) {
        pendingComponentWillMountWarnings.push(fiber);
      }
      if (typeof instance.componentWillReceiveProps === 'function' && instance.componentWillReceiveProps.__suppressDeprecationWarning !== true) {
        pendingComponentWillReceivePropsWarnings.push(fiber);
      }
      if (typeof instance.componentWillUpdate === 'function' && instance.componentWillUpdate.__suppressDeprecationWarning !== true) {
        pendingComponentWillUpdateWarnings.push(fiber);
      }
    };

    ReactStrictModeWarnings.recordUnsafeLifecycleWarnings = function (fiber, instance) {
      var strictRoot = getStrictRoot(fiber);

      // Dedup strategy: Warn once per component.
      // This is difficult to track any other way since component names
      // are often vague and are likely to collide between 3rd party libraries.
      // An expand property is probably okay to use here since it's DEV-only,
      // and will only be set in the event of serious warnings.
      if (didWarnAboutUnsafeLifecycles.has(fiber.type)) {
        return;
      }

      // Don't warn about react-lifecycles-compat polyfilled components.
      // Note that it is sufficient to check for the presence of a
      // single lifecycle, componentWillMount, with the polyfill flag.
      if (typeof instance.componentWillMount === 'function' && instance.componentWillMount.__suppressDeprecationWarning === true) {
        return;
      }

      var warningsForRoot = void 0;
      if (!pendingUnsafeLifecycleWarnings.has(strictRoot)) {
        warningsForRoot = {
          UNSAFE_componentWillMount: [],
          UNSAFE_componentWillReceiveProps: [],
          UNSAFE_componentWillUpdate: []
        };

        pendingUnsafeLifecycleWarnings.set(strictRoot, warningsForRoot);
      } else {
        warningsForRoot = pendingUnsafeLifecycleWarnings.get(strictRoot);
      }

      var unsafeLifecycles = [];
      if (typeof instance.componentWillMount === 'function' || typeof instance.UNSAFE_componentWillMount === 'function') {
        unsafeLifecycles.push('UNSAFE_componentWillMount');
      }
      if (typeof instance.componentWillReceiveProps === 'function' || typeof instance.UNSAFE_componentWillReceiveProps === 'function') {
        unsafeLifecycles.push('UNSAFE_componentWillReceiveProps');
      }
      if (typeof instance.componentWillUpdate === 'function' || typeof instance.UNSAFE_componentWillUpdate === 'function') {
        unsafeLifecycles.push('UNSAFE_componentWillUpdate');
      }

      if (unsafeLifecycles.length > 0) {
        unsafeLifecycles.forEach(function (lifecycle) {
          warningsForRoot[lifecycle].push(fiber);
        });
      }
    };
  }

  // Exports ReactDOM.createRoot
  var enableUserTimingAPI = true;

  // Mutating mode (React DOM, React ART, React Native):
  var enableMutatingReconciler = true;
  // Experimental noop mode (currently unused):
  var enableNoopReconciler = false;
  // Experimental persistent mode (Fabric):
  var enablePersistentReconciler = false;
  // Experimental error-boundary API that can recover from errors within a single
  // render phase
  var enableGetDerivedStateFromCatch = false;
  // Helps identify side effects in begin-phase lifecycle hooks and setState reducers:
  var debugRenderPhaseSideEffects = false;

  // In some cases, StrictMode should also double-render lifecycles.
  // This can be confusing for tests though,
  // And it can be bad for performance in production.
  // This feature flag can be used to control the behavior:
  var debugRenderPhaseSideEffectsForStrictMode = true;

  // To preserve the "Pause on caught exceptions" behavior of the debugger, we
  // replay the begin phase of a failed component inside invokeGuardedCallback.
  var replayFailedUnitOfWorkWithInvokeGuardedCallback = true;

  // Warn about deprecated, async-unsafe lifecycles; relates to RFC #6:
  var warnAboutDeprecatedLifecycles = false;



  // Only used in www builds.

  function getCurrentFiberOwnerName() {
    {
      var fiber = ReactDebugCurrentFiber.current;
      if (fiber === null) {
        return null;
      }
      var owner = fiber._debugOwner;
      if (owner !== null && typeof owner !== 'undefined') {
        return getComponentName(owner);
      }
    }
    return null;
  }

  function getCurrentFiberStackAddendum() {
    {
      var fiber = ReactDebugCurrentFiber.current;
      if (fiber === null) {
        return null;
      }
      // Safe because if current fiber exists, we are reconciling,
      // and it is guaranteed to be the work-in-progress version.
      return getStackAddendumByWorkInProgressFiber(fiber);
    }
    return null;
  }

  function resetCurrentFiber() {
    ReactDebugCurrentFrame.getCurrentStack = null;
    ReactDebugCurrentFiber.current = null;
    ReactDebugCurrentFiber.phase = null;
  }

  function setCurrentFiber(fiber) {
    ReactDebugCurrentFrame.getCurrentStack = getCurrentFiberStackAddendum;
    ReactDebugCurrentFiber.current = fiber;
    ReactDebugCurrentFiber.phase = null;
  }

  function setCurrentPhase(phase) {
    ReactDebugCurrentFiber.phase = phase;
  }

  var ReactDebugCurrentFiber = {
    current: null,
    phase: null,
    resetCurrentFiber: resetCurrentFiber,
    setCurrentFiber: setCurrentFiber,
    setCurrentPhase: setCurrentPhase,
    getCurrentFiberOwnerName: getCurrentFiberOwnerName,
    getCurrentFiberStackAddendum: getCurrentFiberStackAddendum
  };

  // 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$$1) {
    var prefix = warning$$1 ? warningEmoji + ' ' : reactEmoji + ' ';
    var suffix = warning$$1 ? ' Warning: ' + warning$$1 : '';
    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$$1) {
    var formattedMarkName = formatMarkName(markName);
    var formattedLabel = formatLabel(label, warning$$1);
    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) || '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) || '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$$1) {
    var componentName = getComponentName(fiber) || 'Unknown';
    var debugID = fiber._debugID;
    var isMounted = fiber.alternate !== null;
    var label = getFiberLabel(componentName, isMounted, phase);
    var markName = getFiberMarkName(label, debugID);
    endMark(label, markName, warning$$1);
  };

  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 CallComponent:
      case ReturnComponent:
      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$$1 = didExpire ? 'React was blocked by main thread' : null;
        endMark('(Waiting for async callback... will force flush in ' + expirationTime + ' ms)', '(Waiting for async callback...)', warning$$1);
      }
    }
  }

  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$$1 = 'An error was thrown inside this error boundary';
      endFiberMark(fiber, null, warning$$1);
    }
  }

  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$$1 = hasScheduledUpdateInCurrentPhase ? 'Scheduled a cascading update' : null;
        endFiberMark(currentPhaseFiber, currentPhase, warning$$1);
      }
      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$$1 = null;
      if (interruptedBy !== null) {
        if (interruptedBy.tag === HostRoot) {
          warning$$1 = 'A top-level update interrupted the previous render';
        } else {
          var componentName = getComponentName(interruptedBy) || 'Unknown';
          warning$$1 = 'An update to ' + componentName + ' interrupted the previous render';
        }
      } else if (commitCountInCurrentWorkLoop > 1) {
        warning$$1 = '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$$1);
    }
  }

  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$$1 = null;
      if (hasScheduledUpdateInCurrentCommit) {
        warning$$1 = 'Lifecycle hook scheduled a cascading update';
      } else if (commitCountInCurrentWorkLoop > 0) {
        warning$$1 = 'Caused by a cascading update in earlier commit';
      }
      hasScheduledUpdateInCurrentCommit = false;
      commitCountInCurrentWorkLoop++;
      isCommitting = false;
      labelsInCurrentCommit.clear();

      endMark('(Committing Changes)', '(Committing Changes)', warning$$1);
    }
  }

  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 didWarnUpdateInsideUpdate = void 0;

  {
    didWarnUpdateInsideUpdate = false;
  }

  // Callbacks are not validated until invocation


  // Singly linked-list of updates. When an update is scheduled, it is added to
  // the queue of the current fiber and the work-in-progress fiber. The two queues
  // are separate but they share a persistent structure.
  //
  // During reconciliation, updates are removed from the work-in-progress fiber,
  // but they remain on the current fiber. That ensures that if a work-in-progress
  // is aborted, the aborted updates are recovered by cloning from current.
  //
  // The work-in-progress queue is always a subset of the current queue.
  //
  // When the tree is committed, the work-in-progress becomes the current.


  function createUpdateQueue(baseState) {
    var queue = {
      baseState: baseState,
      expirationTime: NoWork,
      first: null,
      last: null,
      callbackList: null,
      hasForceUpdate: false,
      isInitialized: false,
      capturedValues: null
    };
    {
      queue.isProcessing = false;
    }
    return queue;
  }

  function insertUpdateIntoQueue(queue, update) {
    // Append the update to the end of the list.
    if (queue.last === null) {
      // Queue is empty
      queue.first = queue.last = update;
    } else {
      queue.last.next = update;
      queue.last = update;
    }
    if (queue.expirationTime === NoWork || queue.expirationTime > update.expirationTime) {
      queue.expirationTime = update.expirationTime;
    }
  }

  var q1 = void 0;
  var q2 = void 0;
  function ensureUpdateQueues(fiber) {
    q1 = q2 = null;
    // We'll have at least one and at most two distinct update queues.
    var alternateFiber = fiber.alternate;
    var queue1 = fiber.updateQueue;
    if (queue1 === null) {
      // TODO: We don't know what the base state will be until we begin work.
      // It depends on which fiber is the next current. Initialize with an empty
      // base state, then set to the memoizedState when rendering. Not super
      // happy with this approach.
      queue1 = fiber.updateQueue = createUpdateQueue(null);
    }

    var queue2 = void 0;
    if (alternateFiber !== null) {
      queue2 = alternateFiber.updateQueue;
      if (queue2 === null) {
        queue2 = alternateFiber.updateQueue = createUpdateQueue(null);
      }
    } else {
      queue2 = null;
    }
    queue2 = queue2 !== queue1 ? queue2 : null;

    // Use module variables instead of returning a tuple
    q1 = queue1;
    q2 = queue2;
  }

  function insertUpdateIntoFiber(fiber, update) {
    ensureUpdateQueues(fiber);
    var queue1 = q1;
    var queue2 = q2;

    // Warn if an update is scheduled from inside an updater function.
    {
      if ((queue1.isProcessing || queue2 !== null && queue2.isProcessing) && !didWarnUpdateInsideUpdate) {
        warning(false, 'An update (setState, replaceState, or forceUpdate) was scheduled ' + 'from inside an update function. Update functions should be pure, ' + 'with zero side-effects. Consider using componentDidUpdate or a ' + 'callback.');
        didWarnUpdateInsideUpdate = true;
      }
    }

    // If there's only one queue, add the update to that queue and exit.
    if (queue2 === null) {
      insertUpdateIntoQueue(queue1, update);
      return;
    }

    // If either queue is empty, we need to add to both queues.
    if (queue1.last === null || queue2.last === null) {
      insertUpdateIntoQueue(queue1, update);
      insertUpdateIntoQueue(queue2, update);
      return;
    }

    // If both lists are not empty, the last update is the same for both lists
    // because of structural sharing. So, we should only append to one of
    // the lists.
    insertUpdateIntoQueue(queue1, update);
    // But we still need to update the `last` pointer of queue2.
    queue2.last = update;
  }

  function getUpdateExpirationTime(fiber) {
    switch (fiber.tag) {
      case HostRoot:
      case ClassComponent:
        var updateQueue = fiber.updateQueue;
        if (updateQueue === null) {
          return NoWork;
        }
        return updateQueue.expirationTime;
      default:
        return NoWork;
    }
  }

  function getStateFromUpdate(update, instance, prevState, props) {
    var partialState = update.partialState;
    if (typeof partialState === 'function') {
      return partialState.call(instance, prevState, props);
    } else {
      return partialState;
    }
  }

  function processUpdateQueue(current, workInProgress, queue, instance, props, renderExpirationTime) {
    if (current !== null && current.updateQueue === queue) {
      // We need to create a work-in-progress queue, by cloning the current queue.
      var currentQueue = queue;
      queue = workInProgress.updateQueue = {
        baseState: currentQueue.baseState,
        expirationTime: currentQueue.expirationTime,
        first: currentQueue.first,
        last: currentQueue.last,
        isInitialized: currentQueue.isInitialized,
        capturedValues: currentQueue.capturedValues,
        // These fields are no longer valid because they were already committed.
        // Reset them.
        callbackList: null,
        hasForceUpdate: false
      };
    }

    {
      // Set this flag so we can warn if setState is called inside the update
      // function of another setState.
      queue.isProcessing = true;
    }

    // Reset the remaining expiration time. If we skip over any updates, we'll
    // increase this accordingly.
    queue.expirationTime = NoWork;

    // TODO: We don't know what the base state will be until we begin work.
    // It depends on which fiber is the next current. Initialize with an empty
    // base state, then set to the memoizedState when rendering. Not super
    // happy with this approach.
    var state = void 0;
    if (queue.isInitialized) {
      state = queue.baseState;
    } else {
      state = queue.baseState = workInProgress.memoizedState;
      queue.isInitialized = true;
    }
    var dontMutatePrevState = true;
    var update = queue.first;
    var didSkip = false;
    while (update !== null) {
      var updateExpirationTime = update.expirationTime;
      if (updateExpirationTime > renderExpirationTime) {
        // This update does not have sufficient priority. Skip it.
        var remainingExpirationTime = queue.expirationTime;
        if (remainingExpirationTime === NoWork || remainingExpirationTime > updateExpirationTime) {
          // Update the remaining expiration time.
          queue.expirationTime = updateExpirationTime;
        }
        if (!didSkip) {
          didSkip = true;
          queue.baseState = state;
        }
        // Continue to the next update.
        update = update.next;
        continue;
      }

      // This update does have sufficient priority.

      // If no previous updates were skipped, drop this update from the queue by
      // advancing the head of the list.
      if (!didSkip) {
        queue.first = update.next;
        if (queue.first === null) {
          queue.last = null;
        }
      }

      // Invoke setState callback an extra time to help detect side-effects.
      // Ignore the return value in this case.
      if (debugRenderPhaseSideEffects || debugRenderPhaseSideEffectsForStrictMode && workInProgress.mode & StrictMode) {
        getStateFromUpdate(update, instance, state, props);
      }

      // Process the update
      var _partialState = void 0;
      if (update.isReplace) {
        state = getStateFromUpdate(update, instance, state, props);
        dontMutatePrevState = true;
      } else {
        _partialState = getStateFromUpdate(update, instance, state, props);
        if (_partialState) {
          if (dontMutatePrevState) {
            // $FlowFixMe: Idk how to type this properly.
            state = _assign({}, state, _partialState);
          } else {
            state = _assign(state, _partialState);
          }
          dontMutatePrevState = false;
        }
      }
      if (update.isForced) {
        queue.hasForceUpdate = true;
      }
      if (update.callback !== null) {
        // Append to list of callbacks.
        var _callbackList = queue.callbackList;
        if (_callbackList === null) {
          _callbackList = queue.callbackList = [];
        }
        _callbackList.push(update);
      }
      if (update.capturedValue !== null) {
        var _capturedValues = queue.capturedValues;
        if (_capturedValues === null) {
          queue.capturedValues = [update.capturedValue];
        } else {
          _capturedValues.push(update.capturedValue);
        }
      }
      update = update.next;
    }

    if (queue.callbackList !== null) {
      workInProgress.effectTag |= Callback;
    } else if (queue.first === null && !queue.hasForceUpdate && queue.capturedValues === null) {
      // The queue is empty. We can reset it.
      workInProgress.updateQueue = null;
    }

    if (!didSkip) {
      didSkip = true;
      queue.baseState = state;
    }

    {
      // No longer processing.
      queue.isProcessing = false;
    }

    return state;
  }

  function commitCallbacks(queue, context) {
    var callbackList = queue.callbackList;
    if (callbackList === null) {
      return;
    }
    // Set the list to null to make sure they don't get called more than once.
    queue.callbackList = null;
    for (var i = 0; i < callbackList.length; i++) {
      var update = callbackList[i];
      var _callback = update.callback;
      // This update might be processed again. Clear the callback so it's only
      // called once.
      update.callback = null;
      !(typeof _callback === 'function') ? invariant(false, 'Invalid argument passed as callback. Expected a function. Instead received: %s', _callback) : void 0;
      _callback.call(context);
    }
  }

  var fakeInternalInstance = {};
  var isArray = Array.isArray;

  var didWarnAboutStateAssignmentForComponent = void 0;
  var didWarnAboutUndefinedDerivedState = void 0;
  var didWarnAboutUninitializedState = void 0;
  var didWarnAboutGetSnapshotBeforeUpdateWithoutDidUpdate = void 0;
  var didWarnAboutLegacyLifecyclesAndDerivedState = void 0;
  var warnOnInvalidCallback = void 0;

  {
    didWarnAboutStateAssignmentForComponent = new Set();
    didWarnAboutUndefinedDerivedState = new Set();
    didWarnAboutUninitializedState = new Set();
    didWarnAboutGetSnapshotBeforeUpdateWithoutDidUpdate = new Set();
    didWarnAboutLegacyLifecyclesAndDerivedState = new Set();

    var didWarnOnInvalidCallback = new Set();

    warnOnInvalidCallback = function (callback, callerName) {
      if (callback === null || typeof callback === 'function') {
        return;
      }
      var key = callerName + '_' + callback;
      if (!didWarnOnInvalidCallback.has(key)) {
        didWarnOnInvalidCallback.add(key);
        warning(false, '%s(...): Expected the last optional `callback` argument to be a ' + 'function. Instead received: %s.', callerName, callback);
      }
    };

    // This is so gross but it's at least non-critical and can be removed if
    // it causes problems. This is meant to give a nicer error message for
    // ReactDOM15.unstable_renderSubtreeIntoContainer(reactDOM16Component,
    // ...)) which otherwise throws a "_processChildContext is not a function"
    // exception.
    Object.defineProperty(fakeInternalInstance, '_processChildContext', {
      enumerable: false,
      value: function () {
        invariant(false, '_processChildContext is not available in React 16+. This likely means you have multiple copies of React and are attempting to nest a React 15 tree inside a React 16 tree using unstable_renderSubtreeIntoContainer, which isn\'t supported. Try to make sure you have only one copy of React (and ideally, switch to ReactDOM.createPortal).');
      }
    });
    Object.freeze(fakeInternalInstance);
  }
  function callGetDerivedStateFromCatch(ctor, capturedValues) {
    var resultState = {};
    for (var i = 0; i < capturedValues.length; i++) {
      var capturedValue = capturedValues[i];
      var error = capturedValue.value;
      var partialState = ctor.getDerivedStateFromCatch.call(null, error);
      if (partialState !== null && partialState !== undefined) {
        _assign(resultState, partialState);
      }
    }
    return resultState;
  }

  var ReactFiberClassComponent = function (legacyContext, scheduleWork, computeExpirationForFiber, memoizeProps, memoizeState) {
    var cacheContext = legacyContext.cacheContext,
        getMaskedContext = legacyContext.getMaskedContext,
        getUnmaskedContext = legacyContext.getUnmaskedContext,
        isContextConsumer = legacyContext.isContextConsumer,
        hasContextChanged = legacyContext.hasContextChanged;

    // Class component state updater

    var updater = {
      isMounted: isMounted,
      enqueueSetState: function (instance, partialState, callback) {
        var fiber = get(instance);
        callback = callback === undefined ? null : callback;
        {
          warnOnInvalidCallback(callback, 'setState');
        }
        var expirationTime = computeExpirationForFiber(fiber);
        var update = {
          expirationTime: expirationTime,
          partialState: partialState,
          callback: callback,
          isReplace: false,
          isForced: false,
          capturedValue: null,
          next: null
        };
        insertUpdateIntoFiber(fiber, update);
        scheduleWork(fiber, expirationTime);
      },
      enqueueReplaceState: function (instance, state, callback) {
        var fiber = get(instance);
        callback = callback === undefined ? null : callback;
        {
          warnOnInvalidCallback(callback, 'replaceState');
        }
        var expirationTime = computeExpirationForFiber(fiber);
        var update = {
          expirationTime: expirationTime,
          partialState: state,
          callback: callback,
          isReplace: true,
          isForced: false,
          capturedValue: null,
          next: null
        };
        insertUpdateIntoFiber(fiber, update);
        scheduleWork(fiber, expirationTime);
      },
      enqueueForceUpdate: function (instance, callback) {
        var fiber = get(instance);
        callback = callback === undefined ? null : callback;
        {
          warnOnInvalidCallback(callback, 'forceUpdate');
        }
        var expirationTime = computeExpirationForFiber(fiber);
        var update = {
          expirationTime: expirationTime,
          partialState: null,
          callback: callback,
          isReplace: false,
          isForced: true,
          capturedValue: null,
          next: null
        };
        insertUpdateIntoFiber(fiber, update);
        scheduleWork(fiber, expirationTime);
      }
    };

    function checkShouldComponentUpdate(workInProgress, oldProps, newProps, oldState, newState, newContext) {
      if (oldProps === null || workInProgress.updateQueue !== null && workInProgress.updateQueue.hasForceUpdate) {
        // If the workInProgress already has an Update effect, return true
        return true;
      }

      var instance = workInProgress.stateNode;
      var ctor = workInProgress.type;
      if (typeof instance.shouldComponentUpdate === 'function') {
        startPhaseTimer(workInProgress, 'shouldComponentUpdate');
        var shouldUpdate = instance.shouldComponentUpdate(newProps, newState, newContext);
        stopPhaseTimer();

        {
          !(shouldUpdate !== undefined) ? warning(false, '%s.shouldComponentUpdate(): Returned undefined instead of a ' + 'boolean value. Make sure to return true or false.', getComponentName(workInProgress) || 'Component') : void 0;
        }

        return shouldUpdate;
      }

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

      return true;
    }

    function checkClassInstance(workInProgress) {
      var instance = workInProgress.stateNode;
      var type = workInProgress.type;
      {
        var name = getComponentName(workInProgress) || 'Component';
        var renderPresent = instance.render;

        if (!renderPresent) {
          if (type.prototype && typeof type.prototype.render === 'function') {
            warning(false, '%s(...): No `render` method found on the returned component ' + 'instance: did you accidentally return an object from the constructor?', name);
          } else {
            warning(false, '%s(...): No `render` method found on the returned component ' + 'instance: you may have forgotten to define `render`.', name);
          }
        }

        var noGetInitialStateOnES6 = !instance.getInitialState || instance.getInitialState.isReactClassApproved || instance.state;
        !noGetInitialStateOnES6 ? warning(false, 'getInitialState was defined on %s, a plain JavaScript class. ' + 'This is only supported for classes created using React.createClass. ' + 'Did you mean to define a state property instead?', name) : void 0;
        var noGetDefaultPropsOnES6 = !instance.getDefaultProps || instance.getDefaultProps.isReactClassApproved;
        !noGetDefaultPropsOnES6 ? warning(false, 'getDefaultProps was defined on %s, a plain JavaScript class. ' + 'This is only supported for classes created using React.createClass. ' + 'Use a static property to define defaultProps instead.', name) : void 0;
        var noInstancePropTypes = !instance.propTypes;
        !noInstancePropTypes ? warning(false, 'propTypes was defined as an instance property on %s. Use a static ' + 'property to define propTypes instead.', name) : void 0;
        var noInstanceContextTypes = !instance.contextTypes;
        !noInstanceContextTypes ? warning(false, 'contextTypes was defined as an instance property on %s. Use a static ' + 'property to define contextTypes instead.', name) : void 0;
        var noComponentShouldUpdate = typeof instance.componentShouldUpdate !== 'function';
        !noComponentShouldUpdate ? warning(false, '%s has a method called ' + 'componentShouldUpdate(). Did you mean shouldComponentUpdate()? ' + 'The name is phrased as a question because the function is ' + 'expected to return a value.', name) : void 0;
        if (type.prototype && type.prototype.isPureReactComponent && typeof instance.shouldComponentUpdate !== 'undefined') {
          warning(false, '%s has a method called shouldComponentUpdate(). ' + 'shouldComponentUpdate should not be used when extending React.PureComponent. ' + 'Please extend React.Component if shouldComponentUpdate is used.', getComponentName(workInProgress) || 'A pure component');
        }
        var noComponentDidUnmount = typeof instance.componentDidUnmount !== 'function';
        !noComponentDidUnmount ? warning(false, '%s has a method called ' + 'componentDidUnmount(). But there is no such lifecycle method. ' + 'Did you mean componentWillUnmount()?', name) : void 0;
        var noComponentDidReceiveProps = typeof instance.componentDidReceiveProps !== 'function';
        !noComponentDidReceiveProps ? warning(false, '%s has a method called ' + 'componentDidReceiveProps(). But there is no such lifecycle method. ' + 'If you meant to update the state in response to changing props, ' + 'use componentWillReceiveProps(). If you meant to fetch data or ' + 'run side-effects or mutations after React has updated the UI, use componentDidUpdate().', name) : void 0;
        var noComponentWillRecieveProps = typeof instance.componentWillRecieveProps !== 'function';
        !noComponentWillRecieveProps ? warning(false, '%s has a method called ' + 'componentWillRecieveProps(). Did you mean componentWillReceiveProps()?', name) : void 0;
        var noUnsafeComponentWillRecieveProps = typeof instance.UNSAFE_componentWillRecieveProps !== 'function';
        !noUnsafeComponentWillRecieveProps ? warning(false, '%s has a method called ' + 'UNSAFE_componentWillRecieveProps(). Did you mean UNSAFE_componentWillReceiveProps()?', name) : void 0;
        var hasMutatedProps = instance.props !== workInProgress.pendingProps;
        !(instance.props === undefined || !hasMutatedProps) ? warning(false, '%s(...): When calling super() in `%s`, make sure to pass ' + "up the same props that your component's constructor was passed.", name, name) : void 0;
        var noInstanceDefaultProps = !instance.defaultProps;
        !noInstanceDefaultProps ? warning(false, 'Setting defaultProps as an instance property on %s is not supported and will be ignored.' + ' Instead, define defaultProps as a static property on %s.', name, name) : void 0;

        if (typeof instance.getSnapshotBeforeUpdate === 'function' && typeof instance.componentDidUpdate !== 'function' && !didWarnAboutGetSnapshotBeforeUpdateWithoutDidUpdate.has(type)) {
          didWarnAboutGetSnapshotBeforeUpdateWithoutDidUpdate.add(type);
          warning(false, '%s: getSnapshotBeforeUpdate() should be used with componentDidUpdate(). ' + 'This component defines getSnapshotBeforeUpdate() only.', getComponentName(workInProgress));
        }

        var noInstanceGetDerivedStateFromProps = typeof instance.getDerivedStateFromProps !== 'function';
        !noInstanceGetDerivedStateFromProps ? warning(false, '%s: getDerivedStateFromProps() is defined as an instance method ' + 'and will be ignored. Instead, declare it as a static method.', name) : void 0;
        var noInstanceGetDerivedStateFromCatch = typeof instance.getDerivedStateFromCatch !== 'function';
        !noInstanceGetDerivedStateFromCatch ? warning(false, '%s: getDerivedStateFromCatch() is defined as an instance method ' + 'and will be ignored. Instead, declare it as a static method.', name) : void 0;
        var noStaticGetSnapshotBeforeUpdate = typeof type.getSnapshotBeforeUpdate !== 'function';
        !noStaticGetSnapshotBeforeUpdate ? warning(false, '%s: getSnapshotBeforeUpdate() is defined as a static method ' + 'and will be ignored. Instead, declare it as an instance method.', name) : void 0;
        var _state = instance.state;
        if (_state && (typeof _state !== 'object' || isArray(_state))) {
          warning(false, '%s.state: must be set to an object or null', name);
        }
        if (typeof instance.getChildContext === 'function') {
          !(typeof type.childContextTypes === 'object') ? warning(false, '%s.getChildContext(): childContextTypes must be defined in order to ' + 'use getChildContext().', name) : void 0;
        }
      }
    }

    function resetInputPointers(workInProgress, instance) {
      instance.props = workInProgress.memoizedProps;
      instance.state = workInProgress.memoizedState;
    }

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

    function constructClassInstance(workInProgress, props) {
      var ctor = workInProgress.type;
      var unmaskedContext = getUnmaskedContext(workInProgress);
      var needsContext = isContextConsumer(workInProgress);
      var context = needsContext ? getMaskedContext(workInProgress, unmaskedContext) : emptyObject;

      // Instantiate twice to help detect side-effects.
      if (debugRenderPhaseSideEffects || debugRenderPhaseSideEffectsForStrictMode && workInProgress.mode & StrictMode) {
        new ctor(props, context); // eslint-disable-line no-new
      }

      var instance = new ctor(props, context);
      var state = instance.state !== null && instance.state !== undefined ? instance.state : null;
      adoptClassInstance(workInProgress, instance);

      {
        if (typeof ctor.getDerivedStateFromProps === 'function' && state === null) {
          var componentName = getComponentName(workInProgress) || 'Component';
          if (!didWarnAboutUninitializedState.has(componentName)) {
            didWarnAboutUninitializedState.add(componentName);
            warning(false, '%s: Did not properly initialize state during construction. ' + 'Expected state to be an object, but it was %s.', componentName, instance.state === null ? 'null' : 'undefined');
          }
        }

        // If new component APIs are defined, "unsafe" lifecycles won't be called.
        // Warn about these lifecycles if they are present.
        // Don't warn about react-lifecycles-compat polyfilled methods though.
        if (typeof ctor.getDerivedStateFromProps === 'function' || typeof instance.getSnapshotBeforeUpdate === 'function') {
          var foundWillMountName = null;
          var foundWillReceivePropsName = null;
          var foundWillUpdateName = null;
          if (typeof instance.componentWillMount === 'function' && instance.componentWillMount.__suppressDeprecationWarning !== true) {
            foundWillMountName = 'componentWillMount';
          } else if (typeof instance.UNSAFE_componentWillMount === 'function') {
            foundWillMountName = 'UNSAFE_componentWillMount';
          }
          if (typeof instance.componentWillReceiveProps === 'function' && instance.componentWillReceiveProps.__suppressDeprecationWarning !== true) {
            foundWillReceivePropsName = 'componentWillReceiveProps';
          } else if (typeof instance.UNSAFE_componentWillReceiveProps === 'function') {
            foundWillReceivePropsName = 'UNSAFE_componentWillReceiveProps';
          }
          if (typeof instance.componentWillUpdate === 'function' && instance.componentWillUpdate.__suppressDeprecationWarning !== true) {
            foundWillUpdateName = 'componentWillUpdate';
          } else if (typeof instance.UNSAFE_componentWillUpdate === 'function') {
            foundWillUpdateName = 'UNSAFE_componentWillUpdate';
          }
          if (foundWillMountName !== null || foundWillReceivePropsName !== null || foundWillUpdateName !== null) {
            var _componentName = getComponentName(workInProgress) || 'Component';
            var newApiName = typeof ctor.getDerivedStateFromProps === 'function' ? 'getDerivedStateFromProps()' : 'getSnapshotBeforeUpdate()';
            if (!didWarnAboutLegacyLifecyclesAndDerivedState.has(_componentName)) {
              didWarnAboutLegacyLifecyclesAndDerivedState.add(_componentName);
              warning(false, 'Unsafe legacy lifecycles will not be called for components using new component APIs.\n\n' + '%s uses %s but also contains the following legacy lifecycles:%s%s%s\n\n' + 'The above lifecycles should be removed. Learn more about this warning here:\n' + 'https://fb.me/react-async-component-lifecycle-hooks', _componentName, newApiName, foundWillMountName !== null ? '\n  ' + foundWillMountName : '', foundWillReceivePropsName !== null ? '\n  ' + foundWillReceivePropsName : '', foundWillUpdateName !== null ? '\n  ' + foundWillUpdateName : '');
            }
          }
        }
      }

      workInProgress.memoizedState = state;

      var partialState = callGetDerivedStateFromProps(workInProgress, instance, props, state);

      if (partialState !== null && partialState !== undefined) {
        // Render-phase updates (like this) should not be added to the update queue,
        // So that multiple render passes do not enqueue multiple updates.
        // Instead, just synchronously merge the returned state into the instance.
        workInProgress.memoizedState = _assign({}, workInProgress.memoizedState, partialState);
      }

      // Cache unmasked context so we can avoid recreating masked context unless necessary.
      // ReactFiberContext usually updates this cache but can't for newly-created instances.
      if (needsContext) {
        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) {
        {
          warning(false, '%s.componentWillMount(): Assigning directly to this.state is ' + "deprecated (except inside a component's " + 'constructor). Use setState instead.', getComponentName(workInProgress) || 'Component');
        }
        updater.enqueueReplaceState(instance, instance.state, null);
      }
    }

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

      if (instance.state !== oldState) {
        {
          var componentName = getComponentName(workInProgress) || 'Component';
          if (!didWarnAboutStateAssignmentForComponent.has(componentName)) {
            didWarnAboutStateAssignmentForComponent.add(componentName);
            warning(false, '%s.componentWillReceiveProps(): Assigning directly to ' + "this.state is deprecated (except inside a component's " + 'constructor). Use setState instead.', componentName);
          }
        }
        updater.enqueueReplaceState(instance, instance.state, null);
      }
    }

    function callGetDerivedStateFromProps(workInProgress, instance, nextProps, prevState) {
      var type = workInProgress.type;


      if (typeof type.getDerivedStateFromProps === 'function') {
        if (debugRenderPhaseSideEffects || debugRenderPhaseSideEffectsForStrictMode && workInProgress.mode & StrictMode) {
          // Invoke method an extra time to help detect side-effects.
          type.getDerivedStateFromProps.call(null, nextProps, prevState);
        }

        var partialState = type.getDerivedStateFromProps.call(null, nextProps, prevState);

        {
          if (partialState === undefined) {
            var componentName = getComponentName(workInProgress) || 'Component';
            if (!didWarnAboutUndefinedDerivedState.has(componentName)) {
              didWarnAboutUndefinedDerivedState.add(componentName);
              warning(false, '%s.getDerivedStateFromProps(): A valid state object (or null) must be returned. ' + 'You have returned undefined.', componentName);
            }
          }
        }

        return partialState;
      }
    }

    // Invokes the mount life-cycles on a previously never rendered instance.
    function mountClassInstance(workInProgress, renderExpirationTime) {
      var ctor = workInProgress.type;
      var current = workInProgress.alternate;

      {
        checkClassInstance(workInProgress);
      }

      var instance = workInProgress.stateNode;
      var props = workInProgress.pendingProps;
      var unmaskedContext = getUnmaskedContext(workInProgress);

      instance.props = props;
      instance.state = workInProgress.memoizedState;
      instance.refs = emptyObject;
      instance.context = getMaskedContext(workInProgress, unmaskedContext);

      {
        if (workInProgress.mode & StrictMode) {
          ReactStrictModeWarnings.recordUnsafeLifecycleWarnings(workInProgress, instance);
        }

        if (warnAboutDeprecatedLifecycles) {
          ReactStrictModeWarnings.recordDeprecationWarnings(workInProgress, instance);
        }
      }

      // 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.
        var updateQueue = workInProgress.updateQueue;
        if (updateQueue !== null) {
          instance.state = processUpdateQueue(current, workInProgress, updateQueue, instance, props, renderExpirationTime);
        }
      }
      if (typeof instance.componentDidMount === 'function') {
        workInProgress.effectTag |= Update;
      }
    }

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

      var oldProps = workInProgress.memoizedProps;
      var newProps = workInProgress.pendingProps;
      var oldContext = instance.context;
      var newUnmaskedContext = getUnmaskedContext(workInProgress);
      var newContext = getMaskedContext(workInProgress, newUnmaskedContext);

      var hasNewLifecycles = typeof ctor.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 !== newContext) {
          callComponentWillReceiveProps(workInProgress, instance, newProps, newContext);
        }
      }

      // Compute the next state using the memoized state and the update queue.
      var oldState = workInProgress.memoizedState;
      // TODO: Previous state can be null.
      var newState = void 0;
      var derivedStateFromCatch = void 0;
      if (workInProgress.updateQueue !== null) {
        newState = processUpdateQueue(null, workInProgress, workInProgress.updateQueue, instance, newProps, renderExpirationTime);

        var updateQueue = workInProgress.updateQueue;
        if (updateQueue !== null && updateQueue.capturedValues !== null && enableGetDerivedStateFromCatch && typeof ctor.getDerivedStateFromCatch === 'function') {
          var capturedValues = updateQueue.capturedValues;
          // Don't remove these from the update queue yet. We need them in
          // finishClassComponent. Do the reset there.
          // TODO: This is awkward. Refactor class components.
          // updateQueue.capturedValues = null;
          derivedStateFromCatch = callGetDerivedStateFromCatch(ctor, capturedValues);
        }
      } else {
        newState = oldState;
      }

      var derivedStateFromProps = void 0;
      if (oldProps !== newProps) {
        // The prevState parameter should be the partially updated state.
        // Otherwise, spreading state in return values could override updates.
        derivedStateFromProps = callGetDerivedStateFromProps(workInProgress, instance, newProps, newState);
      }

      if (derivedStateFromProps !== null && derivedStateFromProps !== undefined) {
        // Render-phase updates (like this) should not be added to the update queue,
        // So that multiple render passes do not enqueue multiple updates.
        // Instead, just synchronously merge the returned state into the instance.
        newState = newState === null || newState === undefined ? derivedStateFromProps : _assign({}, newState, derivedStateFromProps);

        // Update the base state of the update queue.
        // FIXME: This is getting ridiculous. Refactor plz!
        var _updateQueue = workInProgress.updateQueue;
        if (_updateQueue !== null) {
          _updateQueue.baseState = _assign({}, _updateQueue.baseState, derivedStateFromProps);
        }
      }
      if (derivedStateFromCatch !== null && derivedStateFromCatch !== undefined) {
        // Render-phase updates (like this) should not be added to the update queue,
        // So that multiple render passes do not enqueue multiple updates.
        // Instead, just synchronously merge the returned state into the instance.
        newState = newState === null || newState === undefined ? derivedStateFromCatch : _assign({}, newState, derivedStateFromCatch);

        // Update the base state of the update queue.
        // FIXME: This is getting ridiculous. Refactor plz!
        var _updateQueue2 = workInProgress.updateQueue;
        if (_updateQueue2 !== null) {
          _updateQueue2.baseState = _assign({}, _updateQueue2.baseState, derivedStateFromCatch);
        }
      }

      if (oldProps === newProps && oldState === newState && !hasContextChanged() && !(workInProgress.updateQueue !== null && workInProgress.updateQueue.hasForceUpdate)) {
        // 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;
      }

      var shouldUpdate = checkShouldComponentUpdate(workInProgress, oldProps, newProps, oldState, newState, newContext);

      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 props/state to indicate that this work can be reused.
        memoizeProps(workInProgress, newProps);
        memoizeState(workInProgress, newState);
      }

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

      return shouldUpdate;
    }

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

      var oldProps = workInProgress.memoizedProps;
      var newProps = workInProgress.pendingProps;
      var oldContext = instance.context;
      var newUnmaskedContext = getUnmaskedContext(workInProgress);
      var newContext = getMaskedContext(workInProgress, newUnmaskedContext);

      var hasNewLifecycles = typeof ctor.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 !== newContext) {
          callComponentWillReceiveProps(workInProgress, instance, newProps, newContext);
        }
      }

      // Compute the next state using the memoized state and the update queue.
      var oldState = workInProgress.memoizedState;
      // TODO: Previous state can be null.
      var newState = void 0;
      var derivedStateFromCatch = void 0;

      if (workInProgress.updateQueue !== null) {
        newState = processUpdateQueue(current, workInProgress, workInProgress.updateQueue, instance, newProps, renderExpirationTime);

        var updateQueue = workInProgress.updateQueue;
        if (updateQueue !== null && updateQueue.capturedValues !== null && enableGetDerivedStateFromCatch && typeof ctor.getDerivedStateFromCatch === 'function') {
          var capturedValues = updateQueue.capturedValues;
          // Don't remove these from the update queue yet. We need them in
          // finishClassComponent. Do the reset there.
          // TODO: This is awkward. Refactor class components.
          // updateQueue.capturedValues = null;
          derivedStateFromCatch = callGetDerivedStateFromCatch(ctor, capturedValues);
        }
      } else {
        newState = oldState;
      }

      var derivedStateFromProps = void 0;
      if (oldProps !== newProps) {
        // The prevState parameter should be the partially updated state.
        // Otherwise, spreading state in return values could override updates.
        derivedStateFromProps = callGetDerivedStateFromProps(workInProgress, instance, newProps, newState);
      }

      if (derivedStateFromProps !== null && derivedStateFromProps !== undefined) {
        // Render-phase updates (like this) should not be added to the update queue,
        // So that multiple render passes do not enqueue multiple updates.
        // Instead, just synchronously merge the returned state into the instance.
        newState = newState === null || newState === undefined ? derivedStateFromProps : _assign({}, newState, derivedStateFromProps);

        // Update the base state of the update queue.
        // FIXME: This is getting ridiculous. Refactor plz!
        var _updateQueue3 = workInProgress.updateQueue;
        if (_updateQueue3 !== null) {
          _updateQueue3.baseState = _assign({}, _updateQueue3.baseState, derivedStateFromProps);
        }
      }
      if (derivedStateFromCatch !== null && derivedStateFromCatch !== undefined) {
        // Render-phase updates (like this) should not be added to the update queue,
        // So that multiple render passes do not enqueue multiple updates.
        // Instead, just synchronously merge the returned state into the instance.
        newState = newState === null || newState === undefined ? derivedStateFromCatch : _assign({}, newState, derivedStateFromCatch);

        // Update the base state of the update queue.
        // FIXME: This is getting ridiculous. Refactor plz!
        var _updateQueue4 = workInProgress.updateQueue;
        if (_updateQueue4 !== null) {
          _updateQueue4.baseState = _assign({}, _updateQueue4.baseState, derivedStateFromCatch);
        }
      }

      if (oldProps === newProps && oldState === newState && !hasContextChanged() && !(workInProgress.updateQueue !== null && workInProgress.updateQueue.hasForceUpdate)) {
        // 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;
      }

      var shouldUpdate = checkShouldComponentUpdate(workInProgress, oldProps, newProps, oldState, newState, newContext);

      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, newContext);
          }
          if (typeof instance.UNSAFE_componentWillUpdate === 'function') {
            instance.UNSAFE_componentWillUpdate(newProps, newState, newContext);
          }
          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.
        memoizeProps(workInProgress, newProps);
        memoizeState(workInProgress, newState);
      }

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

      return shouldUpdate;
    }

    return {
      adoptClassInstance: adoptClassInstance,
      callGetDerivedStateFromProps: callGetDerivedStateFromProps,
      constructClassInstance: constructClassInstance,
      mountClassInstance: mountClassInstance,
      resumeMountClassInstance: resumeMountClassInstance,
      updateClassInstance: updateClassInstance
    };
  };

  var getCurrentFiberStackAddendum$1 = ReactDebugCurrentFiber.getCurrentFiberStackAddendum;


  var didWarnAboutMaps = void 0;
  var didWarnAboutStringRefInStrictMode = void 0;
  var ownerHasKeyUseWarning = void 0;
  var ownerHasFunctionTypeWarning = void 0;
  var warnForMissingKey = function (child) {};

  {
    didWarnAboutMaps = false;
    didWarnAboutStringRefInStrictMode = {};

    /**
     * Warn if there's no key explicitly set on dynamic arrays of children or
     * object keys are not valid. This allows us to keep track of children between
     * updates.
     */
    ownerHasKeyUseWarning = {};
    ownerHasFunctionTypeWarning = {};

    warnForMissingKey = function (child) {
      if (child === null || typeof child !== 'object') {
        return;
      }
      if (!child._store || child._store.validated || child.key != null) {
        return;
      }
      !(typeof child._store === 'object') ? invariant(false, 'React Component in warnForMissingKey should have a _store. This error is likely caused by a bug in React. Please file an issue.') : void 0;
      child._store.validated = true;

      var currentComponentErrorInfo = 'Each child in an array or iterator should have a unique ' + '"key" prop. See https://fb.me/react-warning-keys for ' + 'more information.' + (getCurrentFiberStackAddendum$1() || '');
      if (ownerHasKeyUseWarning[currentComponentErrorInfo]) {
        return;
      }
      ownerHasKeyUseWarning[currentComponentErrorInfo] = true;

      warning(false, 'Each child in an array or iterator should have a unique ' + '"key" prop. See https://fb.me/react-warning-keys for ' + 'more information.%s', getCurrentFiberStackAddendum$1());
    };
  }

  var isArray$1 = Array.isArray;

  function coerceRef(returnFiber, current, element) {
    var mixedRef = element.ref;
    if (mixedRef !== null && typeof mixedRef !== 'function' && typeof mixedRef !== 'object') {
      {
        if (returnFiber.mode & StrictMode) {
          var componentName = getComponentName(returnFiber) || 'Component';
          if (!didWarnAboutStringRefInStrictMode[componentName]) {
            warning(false, 'A string ref, "%s", has been found within a strict mode tree. ' + 'String refs are a source of potential bugs and should be avoided. ' + 'We recommend using createRef() instead.' + '\n%s' + '\n\nLearn more about using refs safely here:' + '\nhttps://fb.me/react-strict-mode-string-ref', mixedRef, getStackAddendumByWorkInProgressFiber(returnFiber));
            didWarnAboutStringRefInStrictMode[componentName] = true;
          }
        }
      }

      if (element._owner) {
        var owner = element._owner;
        var inst = void 0;
        if (owner) {
          var ownerFiber = owner;
          !(ownerFiber.tag === ClassComponent) ? invariant(false, 'Stateless function components cannot have refs.') : void 0;
          inst = ownerFiber.stateNode;
        }
        !inst ? invariant(false, 'Missing owner for string ref %s. This error is likely caused by a bug in React. Please file an issue.', mixedRef) : void 0;
        var stringRef = '' + mixedRef;
        // Check if previous string ref matches new string ref
        if (current !== null && current.ref !== null && current.ref._stringRef === stringRef) {
          return current.ref;
        }
        var ref = function (value) {
          var refs = inst.refs === emptyObject ? inst.refs = {} : inst.refs;
          if (value === null) {
            delete refs[stringRef];
          } else {
            refs[stringRef] = value;
          }
        };
        ref._stringRef = stringRef;
        return ref;
      } else {
        !(typeof mixedRef === 'string') ? invariant(false, 'Expected ref to be a function or a string.') : void 0;
        !element._owner ? invariant(false, 'Element ref was specified as a string (%s) but no owner was set. This could happen for one of the following reasons:\n1. You may be adding a ref to a functional component\n2. You may be adding a ref to a component that was not created inside a component\'s render method\n3. You have multiple copies of React loaded\nSee https://fb.me/react-refs-must-have-owner for more information.', mixedRef) : void 0;
      }
    }
    return mixedRef;
  }

  function throwOnInvalidObjectType(returnFiber, newChild) {
    if (returnFiber.type !== 'textarea') {
      var addendum = '';
      {
        addendum = ' If you meant to render a collection of children, use an array ' + 'instead.' + (getCurrentFiberStackAddendum$1() || '');
      }
      invariant(false, 'Objects are not valid as a React child (found: %s).%s', Object.prototype.toString.call(newChild) === '[object Object]' ? 'object with keys {' + Object.keys(newChild).join(', ') + '}' : newChild, addendum);
    }
  }

  function warnOnFunctionType() {
    var currentComponentErrorInfo = 'Functions are not valid as a React child. This may happen if ' + 'you return a Component instead of <Component /> from render. ' + 'Or maybe you meant to call this function rather than return it.' + (getCurrentFiberStackAddendum$1() || '');

    if (ownerHasFunctionTypeWarning[currentComponentErrorInfo]) {
      return;
    }
    ownerHasFunctionTypeWarning[currentComponentErrorInfo] = true;

    warning(false, 'Functions are not valid as a React child. This may happen if ' + 'you return a Component instead of <Component /> from render. ' + 'Or maybe you meant to call this function rather than return it.%s', getCurrentFiberStackAddendum$1() || '');
  }

  // 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 = newFiber.alternate;
      if (current !== null) {
        var oldIndex = current.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, textContent, expirationTime) {
      if (current === null || current.tag !== HostText) {
        // Insert
        var created = createFiberFromText(textContent, returnFiber.mode, expirationTime);
        created['return'] = returnFiber;
        return created;
      } else {
        // Update
        var existing = useFiber(current, textContent, expirationTime);
        existing['return'] = returnFiber;
        return existing;
      }
    }

    function updateElement(returnFiber, current, element, expirationTime) {
      if (current !== null && current.type === element.type) {
        // Move based on index
        var existing = useFiber(current, element.props, expirationTime);
        existing.ref = coerceRef(returnFiber, current, element);
        existing['return'] = returnFiber;
        {
          existing._debugSource = element._source;
          existing._debugOwner = element._owner;
        }
        return existing;
      } else {
        // Insert
        var created = createFiberFromElement(element, returnFiber.mode, expirationTime);
        created.ref = coerceRef(returnFiber, current, element);
        created['return'] = returnFiber;
        return created;
      }
    }

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

    function updateFragment(returnFiber, current, fragment, expirationTime, key) {
      if (current === null || current.tag !== Fragment) {
        // Insert
        var created = createFiberFromFragment(fragment, returnFiber.mode, expirationTime, key);
        created['return'] = returnFiber;
        return created;
      } else {
        // Update
        var existing = useFiber(current, 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$1(newChild) || getIteratorFn(newChild)) {
          var _created3 = createFiberFromFragment(newChild, returnFiber.mode, expirationTime, null);
          _created3['return'] = returnFiber;
          return _created3;
        }

        throwOnInvalidObjectType(returnFiber, newChild);
      }

      {
        if (typeof newChild === 'function') {
          warnOnFunctionType();
        }
      }

      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$1(newChild) || getIteratorFn(newChild)) {
          if (key !== null) {
            return null;
          }

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

        throwOnInvalidObjectType(returnFiber, newChild);
      }

      {
        if (typeof newChild === 'function') {
          warnOnFunctionType();
        }
      }

      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$1(newChild) || getIteratorFn(newChild)) {
          var _matchedFiber3 = existingChildren.get(newIdx) || null;
          return updateFragment(returnFiber, _matchedFiber3, newChild, expirationTime, null);
        }

        throwOnInvalidObjectType(returnFiber, newChild);
      }

      {
        if (typeof newChild === 'function') {
          warnOnFunctionType();
        }
      }

      return null;
    }

    /**
     * Warns if there is a duplicate or missing key
     */
    function warnOnInvalidKey(child, knownKeys) {
      {
        if (typeof child !== 'object' || child === null) {
          return knownKeys;
        }
        switch (child.$$typeof) {
          case REACT_ELEMENT_TYPE:
          case REACT_PORTAL_TYPE:
            warnForMissingKey(child);
            var key = child.key;
            if (typeof key !== 'string') {
              break;
            }
            if (knownKeys === null) {
              knownKeys = new Set();
              knownKeys.add(key);
              break;
            }
            if (!knownKeys.has(key)) {
              knownKeys.add(key);
              break;
            }
            warning(false, 'Encountered two children with the same key, `%s`. ' + 'Keys should be unique so that components maintain their identity ' + 'across updates. Non-unique keys may cause children to be ' + 'duplicated and/or omitted — the behavior is unsupported and ' + 'could change in a future version.%s', key, getCurrentFiberStackAddendum$1());
            break;
          default:
            break;
        }
      }
      return knownKeys;
    }

    function reconcileChildrenArray(returnFiber, currentFirstChild, newChildren, expirationTime) {
      // This algorithm can't optimize by searching from boths 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.

      {
        // First, validate keys.
        var knownKeys = null;
        for (var i = 0; i < newChildren.length; i++) {
          var child = newChildren[i];
          knownKeys = warnOnInvalidKey(child, knownKeys);
        }
      }

      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') ? invariant(false, 'An object is not an iterable. This error is likely caused by a bug in React. Please file an issue.') : void 0;

      {
        // Warn about using Maps as children
        if (typeof newChildrenIterable.entries === 'function') {
          var possibleMap = newChildrenIterable;
          if (possibleMap.entries === iteratorFn) {
            !didWarnAboutMaps ? warning(false, 'Using Maps as children is unsupported and will likely yield ' + 'unexpected results. Convert it to a sequence/iterable of keyed ' + 'ReactElements instead.%s', getCurrentFiberStackAddendum$1()) : void 0;
            didWarnAboutMaps = true;
          }
        }

        // First, validate keys.
        // We'll get a different iterator later for the main pass.
        var _newChildren = iteratorFn.call(newChildrenIterable);
        if (_newChildren) {
          var knownKeys = null;
          var _step = _newChildren.next();
          for (; !_step.done; _step = _newChildren.next()) {
            var child = _step.value;
            knownKeys = warnOnInvalidKey(child, knownKeys);
          }
        }
      }

      var newChildren = iteratorFn.call(newChildrenIterable);
      !(newChildren != null) ? invariant(false, 'An iterable object provided no iterator.') : 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.type === 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;
            {
              existing._debugSource = element._source;
              existing._debugOwner = element._owner;
            }
            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.
      if (typeof newChild === 'object' && newChild !== null && newChild.type === REACT_FRAGMENT_TYPE && newChild.key === null) {
        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$1(newChild)) {
        return reconcileChildrenArray(returnFiber, currentFirstChild, newChild, expirationTime);
      }

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

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

      {
        if (typeof newChild === 'function') {
          warnOnFunctionType();
        }
      }
      if (typeof newChild === 'undefined') {
        // 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:
            {
              {
                var instance = returnFiber.stateNode;
                if (instance.render._isMockFunction) {
                  // We allow auto-mocks to proceed as if they're returning null.
                  break;
                }
              }
            }
          // Intentionally fall through to the next case, which handles both
          // functions and classes
          // eslint-disable-next-lined no-fallthrough
          case FunctionalComponent:
            {
              var Component = returnFiber.type;
              invariant(false, '%s(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.', 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, workInProgress) {
    !(current === null || workInProgress.child === current.child) ? invariant(false, 'Resuming work not yet implemented.') : 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 didWarnAboutBadClass = void 0;
  var didWarnAboutGetDerivedStateOnFunctionalComponent = void 0;
  var didWarnAboutStatelessRefs = void 0;

  {
    didWarnAboutBadClass = {};
    didWarnAboutGetDerivedStateOnFunctionalComponent = {};
    didWarnAboutStatelessRefs = {};
  }

  var ReactFiberBeginWork = function (config, hostContext, legacyContext, newContext, hydrationContext, scheduleWork, computeExpirationForFiber) {
    var shouldSetTextContent = config.shouldSetTextContent,
        shouldDeprioritizeSubtree = config.shouldDeprioritizeSubtree;
    var pushHostContext = hostContext.pushHostContext,
        pushHostContainer = hostContext.pushHostContainer;
    var pushProvider = newContext.pushProvider;
    var getMaskedContext = legacyContext.getMaskedContext,
        getUnmaskedContext = legacyContext.getUnmaskedContext,
        hasLegacyContextChanged = legacyContext.hasContextChanged,
        pushLegacyContextProvider = legacyContext.pushContextProvider,
        pushTopLevelContextObject = legacyContext.pushTopLevelContextObject,
        invalidateContextProvider = legacyContext.invalidateContextProvider;
    var enterHydrationState = hydrationContext.enterHydrationState,
        resetHydrationState = hydrationContext.resetHydrationState,
        tryToClaimNextHydratableInstance = hydrationContext.tryToClaimNextHydratableInstance;

    var _ReactFiberClassCompo = ReactFiberClassComponent(legacyContext, scheduleWork, computeExpirationForFiber, memoizeProps, memoizeState),
        adoptClassInstance = _ReactFiberClassCompo.adoptClassInstance,
        callGetDerivedStateFromProps = _ReactFiberClassCompo.callGetDerivedStateFromProps,
        constructClassInstance = _ReactFiberClassCompo.constructClassInstance,
        mountClassInstance = _ReactFiberClassCompo.mountClassInstance,
        resumeMountClassInstance = _ReactFiberClassCompo.resumeMountClassInstance,
        updateClassInstance = _ReactFiberClassCompo.updateClassInstance;

    // TODO: Remove this and use reconcileChildrenAtExpirationTime directly.


    function reconcileChildren(current, workInProgress, nextChildren) {
      reconcileChildrenAtExpirationTime(current, workInProgress, nextChildren, workInProgress.expirationTime);
    }

    function reconcileChildrenAtExpirationTime(current, workInProgress, nextChildren, renderExpirationTime) {
      if (current === 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.child, nextChildren, renderExpirationTime);
      }
    }

    function updateForwardRef(current, workInProgress) {
      var render = workInProgress.type.render;
      var nextChildren = render(workInProgress.pendingProps, workInProgress.ref);
      reconcileChildren(current, workInProgress, nextChildren);
      memoizeProps(workInProgress, nextChildren);
      return workInProgress.child;
    }

    function updateFragment(current, workInProgress) {
      var nextChildren = workInProgress.pendingProps;
      if (hasLegacyContextChanged()) ; else if (workInProgress.memoizedProps === nextChildren) {
        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }
      reconcileChildren(current, workInProgress, nextChildren);
      memoizeProps(workInProgress, nextChildren);
      return workInProgress.child;
    }

    function updateMode(current, workInProgress) {
      var nextChildren = workInProgress.pendingProps.children;
      if (hasLegacyContextChanged()) ; else if (nextChildren === null || workInProgress.memoizedProps === nextChildren) {
        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }
      reconcileChildren(current, workInProgress, nextChildren);
      memoizeProps(workInProgress, nextChildren);
      return workInProgress.child;
    }

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

    function updateFunctionalComponent(current, workInProgress) {
      var fn = workInProgress.type;
      var nextProps = workInProgress.pendingProps;

      if (hasLegacyContextChanged()) ; else {
        if (workInProgress.memoizedProps === nextProps) {
          return bailoutOnAlreadyFinishedWork(current, workInProgress);
        }
        // TODO: consider bringing fn.shouldComponentUpdate() back.
        // It used to be here.
      }

      var unmaskedContext = getUnmaskedContext(workInProgress);
      var context = getMaskedContext(workInProgress, unmaskedContext);

      var nextChildren = void 0;

      {
        ReactCurrentOwner.current = workInProgress;
        ReactDebugCurrentFiber.setCurrentPhase('render');
        nextChildren = fn(nextProps, context);
        ReactDebugCurrentFiber.setCurrentPhase(null);
      }
      // React DevTools reads this flag.
      workInProgress.effectTag |= PerformedWork;
      reconcileChildren(current, workInProgress, nextChildren);
      memoizeProps(workInProgress, nextProps);
      return workInProgress.child;
    }

    function updateClassComponent(current, workInProgress, renderExpirationTime) {
      // 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 = pushLegacyContextProvider(workInProgress);
      var shouldUpdate = void 0;
      if (current === null) {
        if (workInProgress.stateNode === null) {
          // In the initial pass we might need to construct the instance.
          constructClassInstance(workInProgress, workInProgress.pendingProps);
          mountClassInstance(workInProgress, renderExpirationTime);

          shouldUpdate = true;
        } else {
          // In a resume, we'll already have an instance we can reuse.
          shouldUpdate = resumeMountClassInstance(workInProgress, renderExpirationTime);
        }
      } else {
        shouldUpdate = updateClassInstance(current, workInProgress, renderExpirationTime);
      }

      // We processed the update queue inside updateClassInstance. It may have
      // included some errors that were dispatched during the commit phase.
      // TODO: Refactor class components so this is less awkward.
      var didCaptureError = false;
      var updateQueue = workInProgress.updateQueue;
      if (updateQueue !== null && updateQueue.capturedValues !== null) {
        shouldUpdate = true;
        didCaptureError = true;
      }
      return finishClassComponent(current, workInProgress, shouldUpdate, hasContext, didCaptureError, renderExpirationTime);
    }

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

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

        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }

      var ctor = workInProgress.type;
      var instance = workInProgress.stateNode;

      // Rerender
      ReactCurrentOwner.current = workInProgress;
      var nextChildren = void 0;
      if (didCaptureError && (!enableGetDerivedStateFromCatch || typeof ctor.getDerivedStateFromCatch !== '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;
      } else {
        {
          ReactDebugCurrentFiber.setCurrentPhase('render');
          nextChildren = instance.render();
          if (debugRenderPhaseSideEffects || debugRenderPhaseSideEffectsForStrictMode && workInProgress.mode & StrictMode) {
            instance.render();
          }
          ReactDebugCurrentFiber.setCurrentPhase(null);
        }
      }

      // React DevTools reads this flag.
      workInProgress.effectTag |= PerformedWork;
      if (didCaptureError) {
        // If we're recovering from an error, reconcile twice: first to delete
        // all the existing children.
        reconcileChildrenAtExpirationTime(current, workInProgress, null, renderExpirationTime);
        workInProgress.child = null;
        // Now we can continue reconciling like normal. This has the effect of
        // remounting all children regardless of whether their their
        // identity matches.
      }
      reconcileChildrenAtExpirationTime(current, workInProgress, nextChildren, renderExpirationTime);
      // Memoize props and state using the values we just used to render.
      // TODO: Restructure so we never read values from the instance.
      memoizeState(workInProgress, instance.state);
      memoizeProps(workInProgress, instance.props);

      // The context might have changed so we need to recalculate it.
      if (hasContext) {
        invalidateContextProvider(workInProgress, 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, workInProgress, renderExpirationTime) {
      pushHostRootContext(workInProgress);
      var updateQueue = workInProgress.updateQueue;
      if (updateQueue !== null) {
        var prevState = workInProgress.memoizedState;
        var state = processUpdateQueue(current, workInProgress, updateQueue, null, null, renderExpirationTime);
        memoizeState(workInProgress, state);
        updateQueue = workInProgress.updateQueue;

        var element = void 0;
        if (updateQueue !== null && updateQueue.capturedValues !== null) {
          // There's an uncaught error. Unmount the whole root.
          element = null;
        } else if (prevState === state) {
          // 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, workInProgress);
        } else {
          element = state.element;
        }
        var root = workInProgress.stateNode;
        if ((current === null || current.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, element, renderExpirationTime);
        } else {
          // Otherwise reset hydration state in case we aborted and resumed another
          // root.
          resetHydrationState();
          reconcileChildren(current, workInProgress, element);
        }
        memoizeState(workInProgress, state);
        return workInProgress.child;
      }
      resetHydrationState();
      // If there is no update queue, that's a bailout because the root has no props.
      return bailoutOnAlreadyFinishedWork(current, workInProgress);
    }

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

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

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

      if (hasLegacyContextChanged()) ; else if (memoizedProps === nextProps) {
        var isHidden = workInProgress.mode & AsyncMode && shouldDeprioritizeSubtree(type, nextProps);
        if (isHidden) {
          // Before bailing out, make sure we've deprioritized a hidden component.
          workInProgress.expirationTime = Never;
        }
        if (!isHidden || renderExpirationTime !== Never) {
          return bailoutOnAlreadyFinishedWork(current, workInProgress);
        }
        // If we're rendering a hidden node at hidden priority, don't bailout. The
        // parent is complete, but the children may not be.
      }

      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 && 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, workInProgress);

      // Check the host config to see if the children are offscreen/hidden.
      if (renderExpirationTime !== Never && workInProgress.mode & AsyncMode && shouldDeprioritizeSubtree(type, nextProps)) {
        // Down-prioritize the children.
        workInProgress.expirationTime = Never;
        // Bailout and come back to this fiber later.
        workInProgress.memoizedProps = nextProps;
        return null;
      }

      reconcileChildren(current, workInProgress, nextChildren);
      memoizeProps(workInProgress, nextProps);
      return workInProgress.child;
    }

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

    function mountIndeterminateComponent(current, workInProgress, renderExpirationTime) {
      !(current === null) ? invariant(false, 'An indeterminate component should never have mounted. This error is likely caused by a bug in React. Please file an issue.') : void 0;
      var fn = workInProgress.type;
      var props = workInProgress.pendingProps;
      var unmaskedContext = getUnmaskedContext(workInProgress);
      var context = getMaskedContext(workInProgress, unmaskedContext);

      var value = void 0;

      {
        if (fn.prototype && typeof fn.prototype.render === 'function') {
          var componentName = getComponentName(workInProgress) || 'Unknown';

          if (!didWarnAboutBadClass[componentName]) {
            warning(false, "The <%s /> component appears to have a render method, but doesn't extend React.Component. " + 'This is likely to cause errors. Change %s to extend React.Component instead.', componentName, componentName);
            didWarnAboutBadClass[componentName] = true;
          }
        }
        ReactCurrentOwner.current = workInProgress;
        value = fn(props, context);
      }
      // React DevTools reads this flag.
      workInProgress.effectTag |= PerformedWork;

      if (typeof value === 'object' && value !== null && typeof value.render === 'function' && value.$$typeof === undefined) {
        var Component = workInProgress.type;

        // Proceed under the assumption that this is a class instance
        workInProgress.tag = ClassComponent;

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

        if (typeof Component.getDerivedStateFromProps === 'function') {
          var partialState = callGetDerivedStateFromProps(workInProgress, value, props, workInProgress.memoizedState);

          if (partialState !== null && partialState !== undefined) {
            workInProgress.memoizedState = _assign({}, workInProgress.memoizedState, partialState);
          }
        }

        // 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 = pushLegacyContextProvider(workInProgress);
        adoptClassInstance(workInProgress, value);
        mountClassInstance(workInProgress, renderExpirationTime);
        return finishClassComponent(current, workInProgress, true, hasContext, false, renderExpirationTime);
      } else {
        // Proceed under the assumption that this is a functional component
        workInProgress.tag = FunctionalComponent;
        {
          var _Component = workInProgress.type;

          if (_Component) {
            !!_Component.childContextTypes ? warning(false, '%s(...): childContextTypes cannot be defined on a functional component.', _Component.displayName || _Component.name || 'Component') : void 0;
          }
          if (workInProgress.ref !== null) {
            var info = '';
            var ownerName = ReactDebugCurrentFiber.getCurrentFiberOwnerName();
            if (ownerName) {
              info += '\n\nCheck the render method of `' + ownerName + '`.';
            }

            var warningKey = ownerName || workInProgress._debugID || '';
            var debugSource = workInProgress._debugSource;
            if (debugSource) {
              warningKey = debugSource.fileName + ':' + debugSource.lineNumber;
            }
            if (!didWarnAboutStatelessRefs[warningKey]) {
              didWarnAboutStatelessRefs[warningKey] = true;
              warning(false, 'Stateless function components cannot be given refs. ' + 'Attempts to access this ref will fail.%s%s', info, ReactDebugCurrentFiber.getCurrentFiberStackAddendum());
            }
          }

          if (typeof fn.getDerivedStateFromProps === 'function') {
            var _componentName = getComponentName(workInProgress) || 'Unknown';

            if (!didWarnAboutGetDerivedStateOnFunctionalComponent[_componentName]) {
              warning(false, '%s: Stateless functional components do not support getDerivedStateFromProps.', _componentName);
              didWarnAboutGetDerivedStateOnFunctionalComponent[_componentName] = true;
            }
          }
        }
        reconcileChildren(current, workInProgress, value);
        memoizeProps(workInProgress, props);
        return workInProgress.child;
      }
    }

    function updateCallComponent(current, workInProgress, renderExpirationTime) {
      var nextProps = workInProgress.pendingProps;
      if (hasLegacyContextChanged()) ; else if (workInProgress.memoizedProps === nextProps) {
        nextProps = workInProgress.memoizedProps;
        // TODO: When bailing out, we might need to return the stateNode instead
        // of the child. To check it for work.
        // return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }

      var nextChildren = nextProps.children;

      // The following is a fork of reconcileChildrenAtExpirationTime but using
      // stateNode to store the child.
      if (current === null) {
        workInProgress.stateNode = mountChildFibers(workInProgress, workInProgress.stateNode, nextChildren, renderExpirationTime);
      } else {
        workInProgress.stateNode = reconcileChildFibers(workInProgress, current.stateNode, nextChildren, renderExpirationTime);
      }

      memoizeProps(workInProgress, nextProps);
      // This doesn't take arbitrary time so we could synchronously just begin
      // eagerly do the work of workInProgress.child as an optimization.
      return workInProgress.stateNode;
    }

    function updatePortalComponent(current, workInProgress, renderExpirationTime) {
      pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
      var nextChildren = workInProgress.pendingProps;
      if (hasLegacyContextChanged()) ; else if (workInProgress.memoizedProps === nextChildren) {
        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }

      if (current === 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);
        memoizeProps(workInProgress, nextChildren);
      } else {
        reconcileChildren(current, workInProgress, nextChildren);
        memoizeProps(workInProgress, nextChildren);
      }
      return workInProgress.child;
    }

    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.
        switch (fiber.tag) {
          case ContextConsumer:
            // Check if the context matches.
            var observedBits = fiber.stateNode | 0;
            if (fiber.type === context && (observedBits & changedBits) !== 0) {
              // Update the expiration time of all the ancestors, including
              // the alternates.
              var node = fiber;
              while (node !== null) {
                var alternate = node.alternate;
                if (node.expirationTime === NoWork || node.expirationTime > renderExpirationTime) {
                  node.expirationTime = renderExpirationTime;
                  if (alternate !== null && (alternate.expirationTime === NoWork || alternate.expirationTime > renderExpirationTime)) {
                    alternate.expirationTime = renderExpirationTime;
                  }
                } else if (alternate !== null && (alternate.expirationTime === NoWork || alternate.expirationTime > renderExpirationTime)) {
                  alternate.expirationTime = renderExpirationTime;
                } else {
                  // Neither alternate was updated, which means the rest of the
                  // ancestor path already has sufficient priority.
                  break;
                }
                node = node['return'];
              }
              // Don't scan deeper than a matching consumer. When we render the
              // consumer, we'll continue scanning from that point. This way the
              // scanning work is time-sliced.
              nextFiber = null;
            } else {
              // Traverse down.
              nextFiber = fiber.child;
            }
            break;
          case ContextProvider:
            // Don't scan deeper if this is a matching provider
            nextFiber = fiber.type === workInProgress.type ? null : fiber.child;
            break;
          default:
            // Traverse down.
            nextFiber = fiber.child;
            break;
        }
        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) {
              nextFiber = sibling;
              break;
            }
            // No more siblings. Traverse up.
            nextFiber = nextFiber['return'];
          }
        }
        fiber = nextFiber;
      }
    }

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

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

      if (hasLegacyContextChanged()) ; else if (oldProps === newProps) {
        workInProgress.stateNode = 0;
        pushProvider(workInProgress);
        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }

      var newValue = newProps.value;
      workInProgress.memoizedProps = newProps;

      var changedBits = void 0;
      if (oldProps === null) {
        // Initial render
        changedBits = MAX_SIGNED_31_BIT_INT;
      } else {
        if (oldProps.value === newProps.value) {
          // No change. Bailout early if children are the same.
          if (oldProps.children === newProps.children) {
            workInProgress.stateNode = 0;
            pushProvider(workInProgress);
            return bailoutOnAlreadyFinishedWork(current, workInProgress);
          }
          changedBits = 0;
        } else {
          var oldValue = oldProps.value;
          // Use Object.is to compare the new context value to the old value.
          // Inlined Object.is polyfill.
          // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
          if (oldValue === newValue && (oldValue !== 0 || 1 / oldValue === 1 / newValue) || oldValue !== oldValue && newValue !== newValue // eslint-disable-line no-self-compare
          ) {
              // No change. Bailout early if children are the same.
              if (oldProps.children === newProps.children) {
                workInProgress.stateNode = 0;
                pushProvider(workInProgress);
                return bailoutOnAlreadyFinishedWork(current, workInProgress);
              }
              changedBits = 0;
            } else {
            changedBits = typeof context._calculateChangedBits === 'function' ? context._calculateChangedBits(oldValue, newValue) : MAX_SIGNED_31_BIT_INT;
            {
              !((changedBits & MAX_SIGNED_31_BIT_INT) === changedBits) ? warning(false, 'calculateChangedBits: Expected the return value to be a ' + '31-bit integer. Instead received: %s', changedBits) : void 0;
            }
            changedBits |= 0;

            if (changedBits === 0) {
              // No change. Bailout early if children are the same.
              if (oldProps.children === newProps.children) {
                workInProgress.stateNode = 0;
                pushProvider(workInProgress);
                return bailoutOnAlreadyFinishedWork(current, workInProgress);
              }
            } else {
              propagateContextChange(workInProgress, context, changedBits, renderExpirationTime);
            }
          }
        }
      }

      workInProgress.stateNode = changedBits;
      pushProvider(workInProgress);

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

    function updateContextConsumer(current, workInProgress, renderExpirationTime) {
      var context = workInProgress.type;
      var newProps = workInProgress.pendingProps;
      var oldProps = workInProgress.memoizedProps;

      var newValue = context._currentValue;
      var changedBits = context._changedBits;

      if (hasLegacyContextChanged()) ; else if (changedBits === 0 && oldProps === newProps) {
        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }
      workInProgress.memoizedProps = newProps;

      var observedBits = newProps.unstable_observedBits;
      if (observedBits === undefined || observedBits === null) {
        // Subscribe to all changes by default
        observedBits = MAX_SIGNED_31_BIT_INT;
      }
      // Store the observedBits on the fiber's stateNode for quick access.
      workInProgress.stateNode = observedBits;

      if ((changedBits & observedBits) !== 0) {
        // Context change propagation stops at matching consumers, for time-
        // slicing. Continue the propagation here.
        propagateContextChange(workInProgress, context, changedBits, renderExpirationTime);
      } else if (oldProps === newProps) {
        // Skip over a memoized parent with a bitmask bailout even
        // if we began working on it because of a deeper matching child.
        return bailoutOnAlreadyFinishedWork(current, workInProgress);
      }
      // There is no bailout on `children` equality because we expect people
      // to often pass a bound method as a child, but it may reference
      // `this.state` or `this.props` (and thus needs to re-render on `setState`).

      var render = newProps.children;

      {
        !(typeof render === 'function') ? warning(false, 'A context consumer was rendered with multiple children, or a child ' + "that isn't a function. A context consumer expects a single child " + 'that is a function. If you did pass a function, make sure there ' + 'is no trailing or leading whitespace around it.') : void 0;
      }

      var newChildren = render(newValue);
      reconcileChildren(current, workInProgress, newChildren);
      return workInProgress.child;
    }

    /*
    function reuseChildrenEffects(returnFiber : Fiber, firstChild : Fiber) {
      let child = firstChild;
      do {
        // Ensure that the first and last effect of the parent corresponds
        // to the children's first and last effect.
        if (!returnFiber.firstEffect) {
          returnFiber.firstEffect = child.firstEffect;
        }
        if (child.lastEffect) {
          if (returnFiber.lastEffect) {
            returnFiber.lastEffect.nextEffect = child.firstEffect;
          }
          returnFiber.lastEffect = child.lastEffect;
        }
      } while (child = child.sibling);
    }
    */

    function bailoutOnAlreadyFinishedWork(current, workInProgress) {
      cancelWorkTimer(workInProgress);

      // TODO: We should ideally be able to bail out early if the children have no
      // more work to do. However, since we don't have a separation of this
      // Fiber's priority and its children yet - we don't know without doing lots
      // of the same work we do anyway. Once we have that separation we can just
      // bail out here if the children has no more work at this priority level.
      // if (workInProgress.priorityOfChildren <= priorityLevel) {
      //   // If there are side-effects in these children that have not yet been
      //   // committed we need to ensure that they get properly transferred up.
      //   if (current && current.child !== workInProgress.child) {
      //     reuseChildrenEffects(workInProgress, child);
      //   }
      //   return null;
      // }

      cloneChildFibers(current, workInProgress);
      return workInProgress.child;
    }

    function bailoutOnLowPriority(current, workInProgress) {
      cancelWorkTimer(workInProgress);

      // TODO: Handle HostComponent tags here as well and call pushHostContext()?
      // See PR 8590 discussion for context
      switch (workInProgress.tag) {
        case HostRoot:
          pushHostRootContext(workInProgress);
          break;
        case ClassComponent:
          pushLegacyContextProvider(workInProgress);
          break;
        case HostPortal:
          pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
          break;
        case ContextProvider:
          pushProvider(workInProgress);
          break;
      }
      // TODO: What if this is currently in progress?
      // How can that happen? How is this not being cloned?
      return null;
    }

    // TODO: Delete memoizeProps/State and move to reconcile/bailout instead
    function memoizeProps(workInProgress, nextProps) {
      workInProgress.memoizedProps = nextProps;
    }

    function memoizeState(workInProgress, nextState) {
      workInProgress.memoizedState = nextState;
      // Don't reset the updateQueue, in case there are pending updates. Resetting
      // is handled by processUpdateQueue.
    }

    function beginWork(current, workInProgress, renderExpirationTime) {
      if (workInProgress.expirationTime === NoWork || workInProgress.expirationTime > renderExpirationTime) {
        return bailoutOnLowPriority(current, workInProgress);
      }

      switch (workInProgress.tag) {
        case IndeterminateComponent:
          return mountIndeterminateComponent(current, workInProgress, renderExpirationTime);
        case FunctionalComponent:
          return updateFunctionalComponent(current, workInProgress);
        case ClassComponent:
          return updateClassComponent(current, workInProgress, renderExpirationTime);
        case HostRoot:
          return updateHostRoot(current, workInProgress, renderExpirationTime);
        case HostComponent:
          return updateHostComponent(current, workInProgress, renderExpirationTime);
        case HostText:
          return updateHostText(current, workInProgress);
        case CallHandlerPhase:
          // This is a restart. Reset the tag to the initial phase.
          workInProgress.tag = CallComponent;
        // Intentionally fall through since this is now the same.
        case CallComponent:
          return updateCallComponent(current, workInProgress, renderExpirationTime);
        case ReturnComponent:
          // A return component is just a placeholder, we can just run through the
          // next one immediately.
          return null;
        case HostPortal:
          return updatePortalComponent(current, workInProgress, renderExpirationTime);
        case ForwardRef:
          return updateForwardRef(current, workInProgress);
        case Fragment:
          return updateFragment(current, workInProgress);
        case Mode:
          return updateMode(current, workInProgress);
        case ContextProvider:
          return updateContextProvider(current, workInProgress, renderExpirationTime);
        case ContextConsumer:
          return updateContextConsumer(current, workInProgress, renderExpirationTime);
        default:
          invariant(false, 'Unknown unit of work tag. This error is likely caused by a bug in React. Please file an issue.');
      }
    }

    return {
      beginWork: beginWork
    };
  };

  var ReactFiberCompleteWork = function (config, hostContext, legacyContext, newContext, hydrationContext) {
    var createInstance = config.createInstance,
        createTextInstance = config.createTextInstance,
        appendInitialChild = config.appendInitialChild,
        finalizeInitialChildren = config.finalizeInitialChildren,
        prepareUpdate = config.prepareUpdate,
        mutation = config.mutation,
        persistence = config.persistence;
    var getRootHostContainer = hostContext.getRootHostContainer,
        popHostContext = hostContext.popHostContext,
        getHostContext = hostContext.getHostContext,
        popHostContainer = hostContext.popHostContainer;
    var popLegacyContextProvider = legacyContext.popContextProvider,
        popTopLevelLegacyContextObject = legacyContext.popTopLevelContextObject;
    var popProvider = newContext.popProvider;
    var prepareToHydrateHostInstance = hydrationContext.prepareToHydrateHostInstance,
        prepareToHydrateHostTextInstance = hydrationContext.prepareToHydrateHostTextInstance,
        popHydrationState = hydrationContext.popHydrationState;


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

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

    function appendAllReturns(returns, workInProgress) {
      var node = workInProgress.stateNode;
      if (node) {
        node['return'] = workInProgress;
      }
      while (node !== null) {
        if (node.tag === HostComponent || node.tag === HostText || node.tag === HostPortal) {
          invariant(false, 'A call cannot have host component children.');
        } else if (node.tag === ReturnComponent) {
          returns.push(node.pendingProps.value);
        } else if (node.child !== null) {
          node.child['return'] = node;
          node = node.child;
          continue;
        }
        while (node.sibling === null) {
          if (node['return'] === null || node['return'] === workInProgress) {
            return;
          }
          node = node['return'];
        }
        node.sibling['return'] = node['return'];
        node = node.sibling;
      }
    }

    function moveCallToHandlerPhase(current, workInProgress, renderExpirationTime) {
      var props = workInProgress.memoizedProps;
      !props ? invariant(false, 'Should be resolved by now. This error is likely caused by a bug in React. Please file an issue.') : void 0;

      // First step of the call has completed. Now we need to do the second.
      // TODO: It would be nice to have a multi stage call represented by a
      // single component, or at least tail call optimize nested ones. Currently
      // that requires additional fields that we don't want to add to the fiber.
      // So this requires nested handlers.
      // Note: This doesn't mutate the alternate node. I don't think it needs to
      // since this stage is reset for every pass.
      workInProgress.tag = CallHandlerPhase;

      // Build up the returns.
      // TODO: Compare this to a generator or opaque helpers like Children.
      var returns = [];
      appendAllReturns(returns, workInProgress);
      var fn = props.handler;
      var childProps = props.props;
      var nextChildren = fn(childProps, returns);

      var currentFirstChild = current !== null ? current.child : null;
      workInProgress.child = reconcileChildFibers(workInProgress, currentFirstChild, nextChildren, renderExpirationTime);
      return workInProgress.child;
    }

    function appendAllChildren(parent, workInProgress) {
      // 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) ; 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;
      }
    }

    var updateHostContainer = void 0;
    var updateHostComponent = void 0;
    var updateHostText = void 0;
    if (mutation) {
      if (enableMutatingReconciler) {
        // Mutation mode
        updateHostContainer = function (workInProgress) {
          // Noop
        };
        updateHostComponent = function (current, workInProgress, updatePayload, 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 = 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 {
        invariant(false, 'Mutating reconciler is disabled.');
      }
    } else if (persistence) {
      if (enablePersistentReconciler) {
        // Persistent host tree mode
        var cloneInstance = persistence.cloneInstance,
            createContainerChildSet = persistence.createContainerChildSet,
            appendChildToContainerChildSet = persistence.appendChildToContainerChildSet,
            finalizeContainerChildren = persistence.finalizeContainerChildren;

        // An unfortunate fork of appendAllChildren because we have two different parent types.

        var appendAllChildrenToContainer = function (containerChildSet, workInProgress) {
          // 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) {
              appendChildToContainerChildSet(containerChildSet, node.stateNode);
            } else if (node.tag === HostPortal) ; 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) {
          var portalOrRoot = workInProgress.stateNode;
          var childrenUnchanged = workInProgress.firstEffect === null;
          if (childrenUnchanged) ; 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);
            portalOrRoot.pendingChildren = newChildSet;
            // Schedule an update on the container to swap out the container.
            markUpdate(workInProgress);
            finalizeContainerChildren(container, newChildSet);
          }
        };
        updateHostComponent = function (current, workInProgress, updatePayload, type, oldProps, newProps, rootContainerInstance, currentHostContext) {
          // 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;
          var currentInstance = current.stateNode;
          if (childrenUnchanged && updatePayload === null) {
            // No changes, just reuse the existing instance.
            // Note that this might release a previous clone.
            workInProgress.stateNode = currentInstance;
          } else {
            var recyclableInstance = workInProgress.stateNode;
            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);
            }
          }
        };
        updateHostText = 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 {
        invariant(false, 'Persistent reconciler is disabled.');
      }
    } else {
      if (enableNoopReconciler) {
        // No host operations
        updateHostContainer = function (workInProgress) {
          // Noop
        };
        updateHostComponent = function (current, workInProgress, updatePayload, type, oldProps, newProps, rootContainerInstance, currentHostContext) {
          // Noop
        };
        updateHostText = function (current, workInProgress, oldText, newText) {
          // Noop
        };
      } else {
        invariant(false, 'Noop reconciler is disabled.');
      }
    }

    function completeWork(current, workInProgress, renderExpirationTime) {
      var newProps = workInProgress.pendingProps;
      switch (workInProgress.tag) {
        case FunctionalComponent:
          return null;
        case ClassComponent:
          {
            // We are leaving this subtree, so pop context if any.
            popLegacyContextProvider(workInProgress);

            // If this component caught an error, schedule an error log effect.
            var instance = workInProgress.stateNode;
            var updateQueue = workInProgress.updateQueue;
            if (updateQueue !== null && updateQueue.capturedValues !== null) {
              workInProgress.effectTag &= ~DidCapture;
              if (typeof instance.componentDidCatch === 'function') {
                workInProgress.effectTag |= ErrLog;
              } else {
                // Normally we clear this in the commit phase, but since we did not
                // schedule an effect, we need to reset it here.
                updateQueue.capturedValues = null;
              }
            }
            return null;
          }
        case HostRoot:
          {
            popHostContainer(workInProgress);
            popTopLevelLegacyContextObject(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);

            var _updateQueue = workInProgress.updateQueue;
            if (_updateQueue !== null && _updateQueue.capturedValues !== null) {
              workInProgress.effectTag |= ErrLog;
            }
            return null;
          }
        case HostComponent:
          {
            popHostContext(workInProgress);
            var rootContainerInstance = getRootHostContainer();
            var type = workInProgress.type;
            if (current !== null && workInProgress.stateNode != null) {
              // 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 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);

              updateHostComponent(current, workInProgress, updatePayload, type, oldProps, newProps, rootContainerInstance, currentHostContext);

              if (current.ref !== workInProgress.ref) {
                markRef(workInProgress);
              }
            } else {
              if (!newProps) {
                !(workInProgress.stateNode !== null) ? invariant(false, 'We must have new props for new mounts. This error is likely caused by a bug in React. Please file an issue.') : void 0;
                // This can happen when we abort work.
                return null;
              }

              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 _instance2 = createInstance(type, newProps, rootContainerInstance, _currentHostContext, workInProgress);

                appendAllChildren(_instance2, workInProgress);

                // 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(_instance2, type, newProps, rootContainerInstance, _currentHostContext)) {
                  markUpdate(workInProgress);
                }
                workInProgress.stateNode = _instance2;
              }

              if (workInProgress.ref !== null) {
                // If there is a ref on a host node we need to schedule a callback
                markRef(workInProgress);
              }
            }
            return null;
          }
        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(current, workInProgress, oldText, newText);
            } else {
              if (typeof newText !== 'string') {
                !(workInProgress.stateNode !== null) ? invariant(false, 'We must have new props for new mounts. This error is likely caused by a bug in React. Please file an issue.') : void 0;
                // This can happen when we abort work.
                return null;
              }
              var _rootContainerInstance = getRootHostContainer();
              var _currentHostContext2 = getHostContext();
              var _wasHydrated = popHydrationState(workInProgress);
              if (_wasHydrated) {
                if (prepareToHydrateHostTextInstance(workInProgress)) {
                  markUpdate(workInProgress);
                }
              } else {
                workInProgress.stateNode = createTextInstance(newText, _rootContainerInstance, _currentHostContext2, workInProgress);
              }
            }
            return null;
          }
        case CallComponent:
          return moveCallToHandlerPhase(current, workInProgress, renderExpirationTime);
        case CallHandlerPhase:
          // Reset the tag to now be a first phase call.
          workInProgress.tag = CallComponent;
          return null;
        case ReturnComponent:
          // Does nothing.
          return null;
        case ForwardRef:
          return null;
        case Fragment:
          return null;
        case Mode:
          return null;
        case HostPortal:
          popHostContainer(workInProgress);
          updateHostContainer(workInProgress);
          return null;
        case ContextProvider:
          // Pop provider fiber
          popProvider(workInProgress);
          return null;
        case ContextConsumer:
          return null;
        // Error cases
        case IndeterminateComponent:
          invariant(false, 'An indeterminate component should have become determinate before completing. This error is likely caused by a bug in React. Please file an issue.');
        // eslint-disable-next-line no-fallthrough
        default:
          invariant(false, 'Unknown unit of work tag. This error is likely caused by a bug in React. Please file an issue.');
      }
    }

    return {
      completeWork: completeWork
    };
  };

  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: getStackAddendumByWorkInProgressFiber(source)
    };
  }

  var ReactFiberUnwindWork = function (hostContext, legacyContext, newContext, scheduleWork, isAlreadyFailedLegacyErrorBoundary) {
    var popHostContainer = hostContext.popHostContainer,
        popHostContext = hostContext.popHostContext;
    var popLegacyContextProvider = legacyContext.popContextProvider,
        popTopLevelLegacyContextObject = legacyContext.popTopLevelContextObject;
    var popProvider = newContext.popProvider;


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

      var value = createCapturedValue(rawValue, sourceFiber);

      var workInProgress = returnFiber;
      do {
        switch (workInProgress.tag) {
          case HostRoot:
            {
              // Uncaught error
              var errorInfo = value;
              ensureUpdateQueues(workInProgress);
              var updateQueue = workInProgress.updateQueue;
              updateQueue.capturedValues = [errorInfo];
              workInProgress.effectTag |= ShouldCapture;
              return;
            }
          case ClassComponent:
            // Capture and retry
            var ctor = workInProgress.type;
            var _instance = workInProgress.stateNode;
            if ((workInProgress.effectTag & DidCapture) === NoEffect && (typeof ctor.getDerivedStateFromCatch === 'function' && enableGetDerivedStateFromCatch || _instance !== null && typeof _instance.componentDidCatch === 'function' && !isAlreadyFailedLegacyErrorBoundary(_instance))) {
              ensureUpdateQueues(workInProgress);
              var _updateQueue = workInProgress.updateQueue;
              var capturedValues = _updateQueue.capturedValues;
              if (capturedValues === null) {
                _updateQueue.capturedValues = [value];
              } else {
                capturedValues.push(value);
              }
              workInProgress.effectTag |= ShouldCapture;
              return;
            }
            break;
          default:
            break;
        }
        workInProgress = workInProgress['return'];
      } while (workInProgress !== null);
    }

    function unwindWork(workInProgress) {
      switch (workInProgress.tag) {
        case ClassComponent:
          {
            popLegacyContextProvider(workInProgress);
            var effectTag = workInProgress.effectTag;
            if (effectTag & ShouldCapture) {
              workInProgress.effectTag = effectTag & ~ShouldCapture | DidCapture;
              return workInProgress;
            }
            return null;
          }
        case HostRoot:
          {
            popHostContainer(workInProgress);
            popTopLevelLegacyContextObject(workInProgress);
            var _effectTag = workInProgress.effectTag;
            if (_effectTag & ShouldCapture) {
              workInProgress.effectTag = _effectTag & ~ShouldCapture | DidCapture;
              return workInProgress;
            }
            return null;
          }
        case HostComponent:
          {
            popHostContext(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:
          {
            popLegacyContextProvider(interruptedWork);
            break;
          }
        case HostRoot:
          {
            popHostContainer(interruptedWork);
            popTopLevelLegacyContextObject(interruptedWork);
            break;
          }
        case HostComponent:
          {
            popHostContext(interruptedWork);
            break;
          }
        case HostPortal:
          popHostContainer(interruptedWork);
          break;
        case ContextProvider:
          popProvider(interruptedWork);
          break;
        default:
          break;
      }
    }

    return {
      throwException: throwException,
      unwindWork: unwindWork,
      unwindInterruptedWork: unwindInterruptedWork
    };
  };

  // 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;
    var suppressLogging = error && error.suppressReactErrorLogging;
    if (suppressLogging) {
      return;
    }

    {
      var componentName = capturedError.componentName,
          componentStack = capturedError.componentStack,
          errorBoundaryName = capturedError.errorBoundaryName,
          errorBoundaryFound = capturedError.errorBoundaryFound,
          willRetry = capturedError.willRetry;


      var componentNameMessage = componentName ? 'The above error occurred in the <' + componentName + '> component:' : 'The above error occurred in one of your React components:';

      var errorBoundaryMessage = void 0;
      // errorBoundaryFound check is sufficient; errorBoundaryName check is to satisfy Flow.
      if (errorBoundaryFound && errorBoundaryName) {
        if (willRetry) {
          errorBoundaryMessage = 'React will try to recreate this component tree from scratch ' + ('using the error boundary you provided, ' + errorBoundaryName + '.');
        } else {
          errorBoundaryMessage = 'This error was initially handled by the error boundary ' + errorBoundaryName + '.\n' + 'Recreating the tree from scratch failed so React will unmount the tree.';
        }
      } else {
        errorBoundaryMessage = 'Consider adding an error boundary to your tree to customize error handling behavior.\n' + 'Visit https://fb.me/react-error-boundaries to learn more about error boundaries.';
      }
      var combinedMessage = '' + componentNameMessage + componentStack + '\n\n' + ('' + errorBoundaryMessage);

      // In development, we provide our own message with just the component stack.
      // We don't include the original error message and JS stack because the browser
      // has already printed it. Even if the application swallows the error, it is still
      // displayed by the browser thanks to the DEV-only fake event trick in ReactErrorUtils.
      console.error(combinedMessage);
    }
  }

  var invokeGuardedCallback$3 = ReactErrorUtils.invokeGuardedCallback;
  var hasCaughtError$1 = ReactErrorUtils.hasCaughtError;
  var clearCaughtError$1 = ReactErrorUtils.clearCaughtError;


  var didWarnAboutUndefinedSnapshotBeforeUpdate = null;
  {
    didWarnAboutUndefinedSnapshotBeforeUpdate = new Set();
  }

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

    var capturedError = {
      componentName: source !== null ? getComponentName(source) : 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);
      capturedError.errorBoundaryFound = true;
      capturedError.willRetry = true;
    }

    try {
      logCapturedError(capturedError);
    } catch (e) {
      // Prevent cycle if logCapturedError() throws.
      // A cycle may still occur if logCapturedError renders a component that throws.
      var suppressLogging = e && e.suppressReactErrorLogging;
      if (!suppressLogging) {
        console.error(e);
      }
    }
  }

  var ReactFiberCommitWork = function (config, captureError, scheduleWork, computeExpirationForFiber, markLegacyErrorBoundaryAsFailed, recalculateCurrentTime) {
    var getPublicInstance = config.getPublicInstance,
        mutation = config.mutation,
        persistence = config.persistence;


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

    // Capture errors so they don't interrupt unmounting.
    function safelyCallComponentWillUnmount(current, instance) {
      {
        invokeGuardedCallback$3(null, callComponentWillUnmountWithTimer, null, current, instance);
        if (hasCaughtError$1()) {
          var unmountError = clearCaughtError$1();
          captureError(current, unmountError);
        }
      }
    }

    function safelyDetachRef(current) {
      var ref = current.ref;
      if (ref !== null) {
        if (typeof ref === 'function') {
          {
            invokeGuardedCallback$3(null, ref, null, null);
            if (hasCaughtError$1()) {
              var refError = clearCaughtError$1();
              captureError(current, refError);
            }
          }
        } else {
          ref.current = null;
        }
      }
    }

    function commitBeforeMutationLifeCycles(current, finishedWork) {
      switch (finishedWork.tag) {
        case ClassComponent:
          {
            if (finishedWork.effectTag & Snapshot) {
              if (current !== null) {
                var prevProps = current.memoizedProps;
                var prevState = current.memoizedState;
                startPhaseTimer(finishedWork, 'getSnapshotBeforeUpdate');
                var _instance = finishedWork.stateNode;
                _instance.props = finishedWork.memoizedProps;
                _instance.state = finishedWork.memoizedState;
                var snapshot = _instance.getSnapshotBeforeUpdate(prevProps, prevState);
                {
                  var didWarnSet = didWarnAboutUndefinedSnapshotBeforeUpdate;
                  if (snapshot === undefined && !didWarnSet.has(finishedWork.type)) {
                    didWarnSet.add(finishedWork.type);
                    warning(false, '%s.getSnapshotBeforeUpdate(): A snapshot value (or null) ' + 'must be returned. You have returned undefined.', getComponentName(finishedWork));
                  }
                }
                _instance.__reactInternalSnapshotBeforeUpdate = snapshot;
                stopPhaseTimer();
              }
            }
            return;
          }
        case HostRoot:
        case HostComponent:
        case HostText:
        case HostPortal:
          // Nothing to do for these component types
          return;
        default:
          {
            invariant(false, 'This unit of work tag should not have side-effects. This error is likely caused by a bug in React. Please file an issue.');
          }
      }
    }

    function commitLifeCycles(finishedRoot, current, finishedWork, currentTime, committedExpirationTime) {
      switch (finishedWork.tag) {
        case ClassComponent:
          {
            var _instance2 = finishedWork.stateNode;
            if (finishedWork.effectTag & Update) {
              if (current === null) {
                startPhaseTimer(finishedWork, 'componentDidMount');
                _instance2.props = finishedWork.memoizedProps;
                _instance2.state = finishedWork.memoizedState;
                _instance2.componentDidMount();
                stopPhaseTimer();
              } else {
                var prevProps = current.memoizedProps;
                var prevState = current.memoizedState;
                startPhaseTimer(finishedWork, 'componentDidUpdate');
                _instance2.props = finishedWork.memoizedProps;
                _instance2.state = finishedWork.memoizedState;
                _instance2.componentDidUpdate(prevProps, prevState, _instance2.__reactInternalSnapshotBeforeUpdate);
                stopPhaseTimer();
              }
            }
            var updateQueue = finishedWork.updateQueue;
            if (updateQueue !== null) {
              commitCallbacks(updateQueue, _instance2);
            }
            return;
          }
        case HostRoot:
          {
            var _updateQueue = finishedWork.updateQueue;
            if (_updateQueue !== null) {
              var _instance3 = null;
              if (finishedWork.child !== null) {
                switch (finishedWork.child.tag) {
                  case HostComponent:
                    _instance3 = getPublicInstance(finishedWork.child.stateNode);
                    break;
                  case ClassComponent:
                    _instance3 = finishedWork.child.stateNode;
                    break;
                }
              }
              commitCallbacks(_updateQueue, _instance3);
            }
            return;
          }
        case HostComponent:
          {
            var _instance4 = 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 === null && finishedWork.effectTag & Update) {
              var type = finishedWork.type;
              var props = finishedWork.memoizedProps;
              commitMount(_instance4, type, props, finishedWork);
            }

            return;
          }
        case HostText:
          {
            // We have no life-cycles associated with text.
            return;
          }
        case HostPortal:
          {
            // We have no life-cycles associated with portals.
            return;
          }
        default:
          {
            invariant(false, 'This unit of work tag should not have side-effects. This error is likely caused by a bug in React. Please file an issue.');
          }
      }
    }

    function commitErrorLogging(finishedWork, onUncaughtError) {
      switch (finishedWork.tag) {
        case ClassComponent:
          {
            var ctor = finishedWork.type;
            var _instance5 = finishedWork.stateNode;
            var updateQueue = finishedWork.updateQueue;
            !(updateQueue !== null && updateQueue.capturedValues !== null) ? invariant(false, 'An error logging effect should not have been scheduled if no errors were captured. This error is likely caused by a bug in React. Please file an issue.') : void 0;
            var capturedErrors = updateQueue.capturedValues;
            updateQueue.capturedValues = null;

            if (typeof ctor.getDerivedStateFromCatch !== '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 getDerivedStateFromCatch is
              // not defined.
              markLegacyErrorBoundaryAsFailed(_instance5);
            }

            _instance5.props = finishedWork.memoizedProps;
            _instance5.state = finishedWork.memoizedState;
            for (var i = 0; i < capturedErrors.length; i++) {
              var errorInfo = capturedErrors[i];
              var _error = errorInfo.value;
              var stack = errorInfo.stack;
              logError(finishedWork, errorInfo);
              _instance5.componentDidCatch(_error, {
                componentStack: stack !== null ? stack : ''
              });
            }
          }
          break;
        case HostRoot:
          {
            var _updateQueue2 = finishedWork.updateQueue;
            !(_updateQueue2 !== null && _updateQueue2.capturedValues !== null) ? invariant(false, 'An error logging effect should not have been scheduled if no errors were captured. This error is likely caused by a bug in React. Please file an issue.') : void 0;
            var _capturedErrors = _updateQueue2.capturedValues;
            _updateQueue2.capturedValues = null;
            for (var _i = 0; _i < _capturedErrors.length; _i++) {
              var _errorInfo = _capturedErrors[_i];
              logError(finishedWork, _errorInfo);
              onUncaughtError(_errorInfo.value);
            }
            break;
          }
        default:
          invariant(false, 'This unit of work tag cannot capture errors.  This error is likely caused by a bug in React. Please file an issue.');
      }
    }

    function commitAttachRef(finishedWork) {
      var ref = finishedWork.ref;
      if (ref !== null) {
        var _instance6 = finishedWork.stateNode;
        var instanceToUse = void 0;
        switch (finishedWork.tag) {
          case HostComponent:
            instanceToUse = getPublicInstance(_instance6);
            break;
          default:
            instanceToUse = _instance6;
        }
        if (typeof ref === 'function') {
          ref(instanceToUse);
        } else {
          {
            if (!ref.hasOwnProperty('current')) {
              warning(false, 'Unexpected ref object provided for %s. ' + 'Use either a ref-setter function or React.createRef().%s', getComponentName(finishedWork), getStackAddendumByWorkInProgressFiber(finishedWork));
            }
          }

          ref.current = instanceToUse;
        }
      }
    }

    function commitDetachRef(current) {
      var currentRef = current.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) {
      if (typeof onCommitUnmount === 'function') {
        onCommitUnmount(current);
      }

      switch (current.tag) {
        case ClassComponent:
          {
            safelyDetachRef(current);
            var _instance7 = current.stateNode;
            if (typeof _instance7.componentWillUnmount === 'function') {
              safelyCallComponentWillUnmount(current, _instance7);
            }
            return;
          }
        case HostComponent:
          {
            safelyDetachRef(current);
            return;
          }
        case CallComponent:
          {
            commitNestedUnmounts(current.stateNode);
            return;
          }
        case HostPortal:
          {
            // TODO: this is recursive.
            // We are also not using this parent because
            // the portal will get pushed immediately.
            if (enableMutatingReconciler && mutation) {
              unmountHostComponents(current);
            } else if (enablePersistentReconciler && persistence) {
              emptyPortalContainer(current);
            }
            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.
        !mutation || 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) {
      // 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['return'] = null;
      current.child = null;
      if (current.alternate) {
        current.alternate.child = null;
        current.alternate['return'] = null;
      }
    }

    var emptyPortalContainer = void 0;

    if (!mutation) {
      var commitContainer = void 0;
      if (persistence) {
        var replaceContainerChildren = persistence.replaceContainerChildren,
            createContainerChildSet = persistence.createContainerChildSet;

        emptyPortalContainer = function (current) {
          var portal = current.stateNode;
          var containerInfo = portal.containerInfo;

          var emptyChildSet = createContainerChildSet(containerInfo);
          replaceContainerChildren(containerInfo, emptyChildSet);
        };
        commitContainer = function (finishedWork) {
          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:
              {
                invariant(false, 'This unit of work tag should not have side-effects. This error is likely caused by a bug in React. Please file an issue.');
              }
          }
        };
      } else {
        commitContainer = function (finishedWork) {
          // Noop
        };
      }
      if (enablePersistentReconciler || enableNoopReconciler) {
        return {
          commitResetTextContent: function (finishedWork) {},
          commitPlacement: function (finishedWork) {},
          commitDeletion: function (current) {
            // Detach refs and call componentWillUnmount() on the whole subtree.
            commitNestedUnmounts(current);
            detachFiber(current);
          },
          commitWork: function (current, finishedWork) {
            commitContainer(finishedWork);
          },

          commitLifeCycles: commitLifeCycles,
          commitBeforeMutationLifeCycles: commitBeforeMutationLifeCycles,
          commitErrorLogging: commitErrorLogging,
          commitAttachRef: commitAttachRef,
          commitDetachRef: commitDetachRef
        };
      } else if (persistence) {
        invariant(false, 'Persistent reconciler is disabled.');
      } else {
        invariant(false, 'Noop reconciler is disabled.');
      }
    }
    var commitMount = mutation.commitMount,
        commitUpdate = mutation.commitUpdate,
        resetTextContent = mutation.resetTextContent,
        commitTextUpdate = mutation.commitTextUpdate,
        appendChild = mutation.appendChild,
        appendChildToContainer = mutation.appendChildToContainer,
        insertBefore = mutation.insertBefore,
        insertInContainerBefore = mutation.insertInContainerBefore,
        removeChild = mutation.removeChild,
        removeChildFromContainer = mutation.removeChildFromContainer;


    function getHostParentFiber(fiber) {
      var parent = fiber['return'];
      while (parent !== null) {
        if (isHostParent(parent)) {
          return parent;
        }
        parent = parent['return'];
      }
      invariant(false, 'Expected to find a host parent. This error is likely caused by a bug in React. Please file an issue.');
    }

    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) {
          // 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) {
      // Recursively insert all host nodes into the parent.
      var parentFiber = getHostParentFiber(finishedWork);
      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:
          invariant(false, 'Invalid host parent fiber. This error is likely caused by a bug in React. Please file an issue.');
      }
      if (parentFiber.effectTag & ContentReset) {
        // Reset the text content of the parent before doing any insertions
        resetTextContent(parent);
        // Clear ContentReset from the effect tag
        parentFiber.effectTag &= ~ContentReset;
      }

      var before = getHostSibling(finishedWork);
      // We only have the top Fiber that was inserted but we need 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) ; 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) {
      // We only have the top Fiber that was inserted but we need recurse down its
      var node = current;

      // Each iteration, currentParent is populated with node's host parent if not
      // currentParentIsValid.
      var currentParentIsValid = false;
      var currentParent = void 0;
      var currentParentIsContainer = void 0;

      while (true) {
        if (!currentParentIsValid) {
          var parent = node['return'];
          findParent: while (true) {
            !(parent !== null) ? invariant(false, 'Expected to find a host parent. This error is likely caused by a bug in React. Please file an issue.') : 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 (node.tag === HostPortal) {
          // 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;
          // Visit children because portals might contain host components.
          if (node.child !== null) {
            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) {
          return;
        }
        while (node.sibling === null) {
          if (node['return'] === null || node['return'] === current) {
            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) {
      // Recursively delete all host nodes from the parent.
      // Detach refs and call componentWillUnmount() on the whole subtree.
      unmountHostComponents(current);
      detachFiber(current);
    }

    function commitWork(current, finishedWork) {
      switch (finishedWork.tag) {
        case ClassComponent:
          {
            return;
          }
        case HostComponent:
          {
            var _instance8 = finishedWork.stateNode;
            if (_instance8 != 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 !== null ? current.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(_instance8, updatePayload, type, oldProps, newProps, finishedWork);
              }
            }
            return;
          }
        case HostText:
          {
            !(finishedWork.stateNode !== null) ? invariant(false, 'This should have a text node initialized. This error is likely caused by a bug in React. Please file an issue.') : 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 !== null ? current.memoizedProps : newText;
            commitTextUpdate(textInstance, oldText, newText);
            return;
          }
        case HostRoot:
          {
            return;
          }
        default:
          {
            invariant(false, 'This unit of work tag should not have side-effects. This error is likely caused by a bug in React. Please file an issue.');
          }
      }
    }

    function commitResetTextContent(current) {
      resetTextContent(current.stateNode);
    }

    if (enableMutatingReconciler) {
      return {
        commitBeforeMutationLifeCycles: commitBeforeMutationLifeCycles,
        commitResetTextContent: commitResetTextContent,
        commitPlacement: commitPlacement,
        commitDeletion: commitDeletion,
        commitWork: commitWork,
        commitLifeCycles: commitLifeCycles,
        commitErrorLogging: commitErrorLogging,
        commitAttachRef: commitAttachRef,
        commitDetachRef: commitDetachRef
      };
    } else {
      invariant(false, 'Mutating reconciler is disabled.');
    }
  };

  var NO_CONTEXT = {};

  var ReactFiberHostContext = function (config, stack) {
    var getChildHostContext = config.getChildHostContext,
        getRootHostContext = config.getRootHostContext;
    var createCursor = stack.createCursor,
        push = stack.push,
        pop = stack.pop;


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

    function requiredContext(c) {
      !(c !== NO_CONTEXT) ? invariant(false, 'Expected host context to exist. This error is likely caused by a bug in React. Please file an issue.') : 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, NO_CONTEXT, fiber);
      var nextRootContext = getRootHostContext(nextRootInstance);
      // Now that we know this function doesn't throw, replace it.
      pop(contextStackCursor, fiber);
      push(contextStackCursor, nextRootContext, fiber);
    }

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

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

    function pushHostContext(fiber) {
      var rootInstance = requiredContext(rootInstanceStackCursor.current);
      var context = requiredContext(contextStackCursor.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, 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, fiber);
      pop(contextFiberStackCursor, fiber);
    }

    return {
      getHostContext: getHostContext,
      getRootHostContainer: getRootHostContainer,
      popHostContainer: popHostContainer,
      popHostContext: popHostContext,
      pushHostContainer: pushHostContainer,
      pushHostContext: pushHostContext
    };
  };

  var ReactFiberHydrationContext = function (config) {
    var shouldSetTextContent = config.shouldSetTextContent,
        hydration = config.hydration;

    // If this doesn't have hydration mode.

    if (!hydration) {
      return {
        enterHydrationState: function () {
          return false;
        },
        resetHydrationState: function () {},
        tryToClaimNextHydratableInstance: function () {},
        prepareToHydrateHostInstance: function () {
          invariant(false, 'Expected prepareToHydrateHostInstance() to never be called. This error is likely caused by a bug in React. Please file an issue.');
        },
        prepareToHydrateHostTextInstance: function () {
          invariant(false, 'Expected prepareToHydrateHostTextInstance() to never be called. This error is likely caused by a bug in React. Please file an issue.');
        },
        popHydrationState: function (fiber) {
          return false;
        }
      };
    }

    var canHydrateInstance = hydration.canHydrateInstance,
        canHydrateTextInstance = hydration.canHydrateTextInstance,
        getNextHydratableSibling = hydration.getNextHydratableSibling,
        getFirstHydratableChild = hydration.getFirstHydratableChild,
        hydrateInstance = hydration.hydrateInstance,
        hydrateTextInstance = hydration.hydrateTextInstance,
        didNotMatchHydratedContainerTextInstance = hydration.didNotMatchHydratedContainerTextInstance,
        didNotMatchHydratedTextInstance = hydration.didNotMatchHydratedTextInstance,
        didNotHydrateContainerInstance = hydration.didNotHydrateContainerInstance,
        didNotHydrateInstance = hydration.didNotHydrateInstance,
        didNotFindHydratableContainerInstance = hydration.didNotFindHydratableContainerInstance,
        didNotFindHydratableContainerTextInstance = hydration.didNotFindHydratableContainerTextInstance,
        didNotFindHydratableInstance = hydration.didNotFindHydratableInstance,
        didNotFindHydratableTextInstance = hydration.didNotFindHydratableTextInstance;

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

    function deleteHydratableInstance(returnFiber, instance) {
      {
        switch (returnFiber.tag) {
          case HostRoot:
            didNotHydrateContainerInstance(returnFiber.stateNode.containerInfo, instance);
            break;
          case HostComponent:
            didNotHydrateInstance(returnFiber.type, returnFiber.memoizedProps, returnFiber.stateNode, instance);
            break;
        }
      }

      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;
      {
        switch (returnFiber.tag) {
          case HostRoot:
            {
              var parentContainer = returnFiber.stateNode.containerInfo;
              switch (fiber.tag) {
                case HostComponent:
                  var type = fiber.type;
                  var props = fiber.pendingProps;
                  didNotFindHydratableContainerInstance(parentContainer, type, props);
                  break;
                case HostText:
                  var text = fiber.pendingProps;
                  didNotFindHydratableContainerTextInstance(parentContainer, text);
                  break;
              }
              break;
            }
          case HostComponent:
            {
              var parentType = returnFiber.type;
              var parentProps = returnFiber.memoizedProps;
              var parentInstance = returnFiber.stateNode;
              switch (fiber.tag) {
                case HostComponent:
                  var _type = fiber.type;
                  var _props = fiber.pendingProps;
                  didNotFindHydratableInstance(parentType, parentProps, parentInstance, _type, _props);
                  break;
                case HostText:
                  var _text = fiber.pendingProps;
                  didNotFindHydratableTextInstance(parentType, parentProps, parentInstance, _text);
                  break;
              }
              break;
            }
          default:
            return;
        }
      }
    }

    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;
          }
        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;
      }
      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(nextInstance);
        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, nextHydratableInstance);
      }
      hydrationParentFiber = fiber;
      nextHydratableInstance = getFirstHydratableChild(nextInstance);
    }

    function prepareToHydrateHostInstance(fiber, rootContainerInstance, hostContext) {
      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) {
      var textInstance = fiber.stateNode;
      var textContent = fiber.memoizedProps;
      var shouldUpdate = hydrateTextInstance(textInstance, textContent, fiber);
      {
        if (shouldUpdate) {
          // We assume that prepareToHydrateHostTextInstance is called in a context where the
          // hydration parent is the parent host component of this host text.
          var returnFiber = hydrationParentFiber;
          if (returnFiber !== null) {
            switch (returnFiber.tag) {
              case HostRoot:
                {
                  var parentContainer = returnFiber.stateNode.containerInfo;
                  didNotMatchHydratedContainerTextInstance(parentContainer, textInstance, textContent);
                  break;
                }
              case HostComponent:
                {
                  var parentType = returnFiber.type;
                  var parentProps = returnFiber.memoizedProps;
                  var parentInstance = returnFiber.stateNode;
                  didNotMatchHydratedTextInstance(parentType, parentProps, parentInstance, textInstance, textContent);
                  break;
                }
            }
          }
        }
      }
      return shouldUpdate;
    }

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

    function popHydrationState(fiber) {
      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() {
      hydrationParentFiber = null;
      nextHydratableInstance = null;
      isHydrating = false;
    }

    return {
      enterHydrationState: enterHydrationState,
      resetHydrationState: resetHydrationState,
      tryToClaimNextHydratableInstance: tryToClaimNextHydratableInstance,
      prepareToHydrateHostInstance: prepareToHydrateHostInstance,
      prepareToHydrateHostTextInstance: prepareToHydrateHostTextInstance,
      popHydrationState: popHydrationState
    };
  };

  // 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.
  var ReactFiberInstrumentation = {
    debugTool: null
  };

  var ReactFiberInstrumentation_1 = ReactFiberInstrumentation;

  var warnedAboutMissingGetChildContext = void 0;

  {
    warnedAboutMissingGetChildContext = {};
  }

  var ReactFiberLegacyContext = function (stack) {
    var createCursor = stack.createCursor,
        push = stack.push,
        pop = stack.pop;

    // A cursor to the current merged context object on the stack.

    var contextStackCursor = createCursor(emptyObject);
    // 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 = emptyObject;

    function getUnmaskedContext(workInProgress) {
      var hasOwnContext = isContextProvider(workInProgress);
      if (hasOwnContext) {
        // If the fiber is a context provider itself, when we read its context
        // we 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 emptyObject;
      }

      // 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];
      }

      {
        var name = getComponentName(workInProgress) || 'Unknown';
        checkPropTypes(contextTypes, context, 'context', name, ReactDebugCurrentFiber.getCurrentFiberStackAddendum);
      }

      // Cache unmasked context so we can avoid recreating masked context unless necessary.
      // Context is created before the class component is instantiated so check for instance.
      if (instance) {
        cacheContext(workInProgress, unmaskedContext, context);
      }

      return context;
    }

    function hasContextChanged() {
      return didPerformWorkStackCursor.current;
    }

    function isContextConsumer(fiber) {
      return fiber.tag === ClassComponent && fiber.type.contextTypes != null;
    }

    function isContextProvider(fiber) {
      return fiber.tag === ClassComponent && fiber.type.childContextTypes != null;
    }

    function popContextProvider(fiber) {
      if (!isContextProvider(fiber)) {
        return;
      }

      pop(didPerformWorkStackCursor, fiber);
      pop(contextStackCursor, fiber);
    }

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

    function pushTopLevelContextObject(fiber, context, didChange) {
      !(contextStackCursor.cursor == null) ? invariant(false, 'Unexpected context found on stack. This error is likely caused by a bug in React. Please file an issue.') : void 0;

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

    function processChildContext(fiber, parentContext) {
      var instance = fiber.stateNode;
      var childContextTypes = fiber.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') {
        {
          var componentName = getComponentName(fiber) || 'Unknown';

          if (!warnedAboutMissingGetChildContext[componentName]) {
            warnedAboutMissingGetChildContext[componentName] = true;
            warning(false, '%s.childContextTypes is specified but there is no getChildContext() method ' + 'on the instance. You can either define getChildContext() on %s or remove ' + 'childContextTypes from it.', componentName, componentName);
          }
        }
        return parentContext;
      }

      var childContext = void 0;
      {
        ReactDebugCurrentFiber.setCurrentPhase('getChildContext');
      }
      startPhaseTimer(fiber, 'getChildContext');
      childContext = instance.getChildContext();
      stopPhaseTimer();
      {
        ReactDebugCurrentFiber.setCurrentPhase(null);
      }
      for (var contextKey in childContext) {
        !(contextKey in childContextTypes) ? invariant(false, '%s.getChildContext(): key "%s" is not defined in childContextTypes.', getComponentName(fiber) || 'Unknown', contextKey) : void 0;
      }
      {
        var name = getComponentName(fiber) || 'Unknown';
        checkPropTypes(childContextTypes, childContext, 'child context', name,
        // In practice, there is one case in which we won't get a stack. It's when
        // somebody calls unstable_renderSubtreeIntoContainer() and we process
        // context from the parent component instance. The stack will be missing
        // because it's outside of the reconciliation, and so the pointer has not
        // been set. This is rare and doesn't matter. We'll also remove that API.
        ReactDebugCurrentFiber.getCurrentFiberStackAddendum);
      }

      return _assign({}, parentContext, childContext);
    }

    function pushContextProvider(workInProgress) {
      if (!isContextProvider(workInProgress)) {
        return false;
      }

      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 || emptyObject;

      // 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, didChange) {
      var instance = workInProgress.stateNode;
      !instance ? invariant(false, 'Expected to have an instance by this point. This error is likely caused by a bug in React. Please file an issue.') : 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, 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) ? invariant(false, 'Expected subtree parent to be a mounted class component. This error is likely caused by a bug in React. Please file an issue.') : void 0;

      var node = fiber;
      while (node.tag !== HostRoot) {
        if (isContextProvider(node)) {
          return node.stateNode.__reactInternalMemoizedMergedChildContext;
        }
        var parent = node['return'];
        !parent ? invariant(false, 'Found unexpected detached subtree parent. This error is likely caused by a bug in React. Please file an issue.') : void 0;
        node = parent;
      }
      return node.stateNode.context;
    }

    return {
      getUnmaskedContext: getUnmaskedContext,
      cacheContext: cacheContext,
      getMaskedContext: getMaskedContext,
      hasContextChanged: hasContextChanged,
      isContextConsumer: isContextConsumer,
      isContextProvider: isContextProvider,
      popContextProvider: popContextProvider,
      popTopLevelContextObject: popTopLevelContextObject,
      pushTopLevelContextObject: pushTopLevelContextObject,
      processChildContext: processChildContext,
      pushContextProvider: pushContextProvider,
      invalidateContextProvider: invalidateContextProvider,
      findCurrentUnmaskedContext: findCurrentUnmaskedContext
    };
  };

  var ReactFiberNewContext = function (stack) {
    var createCursor = stack.createCursor,
        push = stack.push,
        pop = stack.pop;


    var providerCursor = createCursor(null);
    var valueCursor = createCursor(null);
    var changedBitsCursor = createCursor(0);

    var rendererSigil = void 0;
    {
      // Use this to detect multiple renderers using the same context
      rendererSigil = {};
    }

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

      push(changedBitsCursor, context._changedBits, providerFiber);
      push(valueCursor, context._currentValue, providerFiber);
      push(providerCursor, providerFiber, providerFiber);

      context._currentValue = providerFiber.pendingProps.value;
      context._changedBits = providerFiber.stateNode;

      {
        !(context._currentRenderer === null || context._currentRenderer === rendererSigil) ? warning(false, 'Detected multiple renderers concurrently rendering the ' + 'same context provider. This is currently unsupported.') : void 0;
        context._currentRenderer = rendererSigil;
      }
    }

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

      pop(providerCursor, providerFiber);
      pop(valueCursor, providerFiber);
      pop(changedBitsCursor, providerFiber);

      var context = providerFiber.type._context;
      context._currentValue = currentValue;
      context._changedBits = changedBits;
    }

    return {
      pushProvider: pushProvider,
      popProvider: popProvider
    };
  };

  var ReactFiberStack = function () {
    var valueStack = [];

    var fiberStack = void 0;

    {
      fiberStack = [];
    }

    var index = -1;

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

    function isEmpty() {
      return index === -1;
    }

    function pop(cursor, fiber) {
      if (index < 0) {
        {
          warning(false, 'Unexpected pop.');
        }
        return;
      }

      {
        if (fiber !== fiberStack[index]) {
          warning(false, 'Unexpected Fiber popped.');
        }
      }

      cursor.current = valueStack[index];

      valueStack[index] = null;

      {
        fiberStack[index] = null;
      }

      index--;
    }

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

      valueStack[index] = cursor.current;

      {
        fiberStack[index] = fiber;
      }

      cursor.current = value;
    }

    function checkThatStackIsEmpty() {
      {
        if (index !== -1) {
          warning(false, 'Expected an empty stack. Something was not reset properly.');
        }
      }
    }

    function resetStackAfterFatalErrorInDev() {
      {
        index = -1;
        valueStack.length = 0;
        fiberStack.length = 0;
      }
    }

    return {
      createCursor: createCursor,
      isEmpty: isEmpty,
      pop: pop,
      push: push,
      checkThatStackIsEmpty: checkThatStackIsEmpty,
      resetStackAfterFatalErrorInDev: resetStackAfterFatalErrorInDev
    };
  };

  var invokeGuardedCallback = ReactErrorUtils.invokeGuardedCallback;
  var hasCaughtError = ReactErrorUtils.hasCaughtError;
  var clearCaughtError = ReactErrorUtils.clearCaughtError;


  var didWarnAboutStateTransition = void 0;
  var didWarnSetStateChildContext = void 0;
  var warnAboutUpdateOnUnmounted = void 0;
  var warnAboutInvalidUpdates = void 0;

  {
    didWarnAboutStateTransition = false;
    didWarnSetStateChildContext = false;
    var didWarnStateUpdateForUnmountedComponent = {};

    warnAboutUpdateOnUnmounted = function (fiber) {
      // We show the whole stack but dedupe on the top component's name because
      // the problematic code almost always lies inside that component.
      var componentName = getComponentName(fiber) || 'ReactClass';
      if (didWarnStateUpdateForUnmountedComponent[componentName]) {
        return;
      }
      warning(false, "Can't call setState (or forceUpdate) on an unmounted component. This " + 'is a no-op, but it indicates a memory leak in your application. To ' + 'fix, cancel all subscriptions and asynchronous tasks in the ' + 'componentWillUnmount method.%s', getStackAddendumByWorkInProgressFiber(fiber));
      didWarnStateUpdateForUnmountedComponent[componentName] = true;
    };

    warnAboutInvalidUpdates = function (instance) {
      switch (ReactDebugCurrentFiber.phase) {
        case 'getChildContext':
          if (didWarnSetStateChildContext) {
            return;
          }
          warning(false, 'setState(...): Cannot call setState() inside getChildContext()');
          didWarnSetStateChildContext = true;
          break;
        case 'render':
          if (didWarnAboutStateTransition) {
            return;
          }
          warning(false, 'Cannot update during an existing state transition (such as within ' + "`render` or another component's constructor). Render methods should " + 'be a pure function of props and state; constructor side-effects are ' + 'an anti-pattern, but can be moved to `componentWillMount`.');
          didWarnAboutStateTransition = true;
          break;
      }
    };
  }

  var ReactFiberScheduler = function (config) {
    var stack = ReactFiberStack();
    var hostContext = ReactFiberHostContext(config, stack);
    var legacyContext = ReactFiberLegacyContext(stack);
    var newContext = ReactFiberNewContext(stack);
    var popHostContext = hostContext.popHostContext,
        popHostContainer = hostContext.popHostContainer;
    var popTopLevelLegacyContextObject = legacyContext.popTopLevelContextObject,
        popLegacyContextProvider = legacyContext.popContextProvider;
    var popProvider = newContext.popProvider;

    var hydrationContext = ReactFiberHydrationContext(config);

    var _ReactFiberBeginWork = ReactFiberBeginWork(config, hostContext, legacyContext, newContext, hydrationContext, scheduleWork, computeExpirationForFiber),
        beginWork = _ReactFiberBeginWork.beginWork;

    var _ReactFiberCompleteWo = ReactFiberCompleteWork(config, hostContext, legacyContext, newContext, hydrationContext),
        completeWork = _ReactFiberCompleteWo.completeWork;

    var _ReactFiberUnwindWork = ReactFiberUnwindWork(hostContext, legacyContext, newContext, scheduleWork, isAlreadyFailedLegacyErrorBoundary),
        throwException = _ReactFiberUnwindWork.throwException,
        unwindWork = _ReactFiberUnwindWork.unwindWork,
        unwindInterruptedWork = _ReactFiberUnwindWork.unwindInterruptedWork;

    var _ReactFiberCommitWork = ReactFiberCommitWork(config, onCommitPhaseError, scheduleWork, computeExpirationForFiber, markLegacyErrorBoundaryAsFailed, recalculateCurrentTime),
        commitBeforeMutationLifeCycles = _ReactFiberCommitWork.commitBeforeMutationLifeCycles,
        commitResetTextContent = _ReactFiberCommitWork.commitResetTextContent,
        commitPlacement = _ReactFiberCommitWork.commitPlacement,
        commitDeletion = _ReactFiberCommitWork.commitDeletion,
        commitWork = _ReactFiberCommitWork.commitWork,
        commitLifeCycles = _ReactFiberCommitWork.commitLifeCycles,
        commitErrorLogging = _ReactFiberCommitWork.commitErrorLogging,
        commitAttachRef = _ReactFiberCommitWork.commitAttachRef,
        commitDetachRef = _ReactFiberCommitWork.commitDetachRef;

    var now = config.now,
        scheduleDeferredCallback = config.scheduleDeferredCallback,
        cancelDeferredCallback = config.cancelDeferredCallback,
        prepareForCommit = config.prepareForCommit,
        resetAfterCommit = config.resetAfterCommit;

    // Represents the current time in ms.

    var originalStartTimeMs = now();
    var mostRecentCurrentTime = msToExpirationTime(0);
    var mostRecentCurrentTimeMs = originalStartTimeMs;

    // Used to ensure computeUniqueAsyncExpiration is monotonically increases.
    var lastUniqueAsyncExpiration = 0;

    // Represents the expiration time that incoming updates should use. (If this
    // is NoWork, use the default strategy: async updates in async mode, sync
    // updates in sync mode.)
    var expirationContext = NoWork;

    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;

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

    var isCommitting = false;

    var isRootReadyForCommit = false;

    var legacyErrorBoundariesThatAlreadyFailed = null;

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

    var stashedWorkInProgressProperties = void 0;
    var replayUnitOfWork = void 0;
    var isReplayingFailedUnitOfWork = void 0;
    var originalReplayError = void 0;
    var rethrowOriginalError = void 0;
    if (replayFailedUnitOfWorkWithInvokeGuardedCallback) {
      stashedWorkInProgressProperties = null;
      isReplayingFailedUnitOfWork = false;
      originalReplayError = null;
      replayUnitOfWork = function (failedUnitOfWork, error, isAsync) {
        // Restore the original state of the work-in-progress
        assignFiberPropertiesInDEV(failedUnitOfWork, stashedWorkInProgressProperties);
        switch (failedUnitOfWork.tag) {
          case HostRoot:
            popHostContainer(failedUnitOfWork);
            popTopLevelLegacyContextObject(failedUnitOfWork);
            break;
          case HostComponent:
            popHostContext(failedUnitOfWork);
            break;
          case ClassComponent:
            popLegacyContextProvider(failedUnitOfWork);
            break;
          case HostPortal:
            popHostContainer(failedUnitOfWork);
            break;
          case ContextProvider:
            popProvider(failedUnitOfWork);
            break;
        }
        // Replay the begin phase.
        isReplayingFailedUnitOfWork = true;
        originalReplayError = error;
        invokeGuardedCallback(null, workLoop, null, isAsync);
        isReplayingFailedUnitOfWork = false;
        originalReplayError = null;
        if (hasCaughtError()) {
          clearCaughtError();
        } else {
          // If the begin phase did not fail the second time, set this pointer
          // back to the original value.
          nextUnitOfWork = failedUnitOfWork;
        }
      };
      rethrowOriginalError = function () {
        throw originalReplayError;
      };
    }

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

      {
        ReactStrictModeWarnings.discardPendingWarnings();
        stack.checkThatStackIsEmpty();
      }

      nextRoot = null;
      nextRenderExpirationTime = NoWork;
      nextUnitOfWork = null;

      isRootReadyForCommit = false;
    }

    function commitAllHostEffects() {
      while (nextEffect !== null) {
        {
          ReactDebugCurrentFiber.setCurrentFiber(nextEffect);
        }
        recordEffect();

        var effectTag = nextEffect.effectTag;

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

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

        // 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;
      }

      {
        ReactDebugCurrentFiber.resetCurrentFiber();
      }
    }

    function commitBeforeMutationLifecycles() {
      while (nextEffect !== null) {
        var effectTag = nextEffect.effectTag;

        if (effectTag & Snapshot) {
          recordEffect();
          var current = nextEffect.alternate;
          commitBeforeMutationLifeCycles(current, nextEffect);
        }

        // Don't cleanup effects yet;
        // This will be done by commitAllLifeCycles()
        nextEffect = nextEffect.nextEffect;
      }
    }

    function commitAllLifeCycles(finishedRoot, currentTime, committedExpirationTime) {
      {
        ReactStrictModeWarnings.flushPendingUnsafeLifecycleWarnings();

        if (warnAboutDeprecatedLifecycles) {
          ReactStrictModeWarnings.flushPendingDeprecationWarnings();
        }
      }
      while (nextEffect !== null) {
        var effectTag = nextEffect.effectTag;

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

        if (effectTag & ErrLog) {
          commitErrorLogging(nextEffect, onUncaughtError);
        }

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

        var next = nextEffect.nextEffect;
        // Ensure that we clean these up so that we don't accidentally keep them.
        // I'm not actually sure this matters because we can't reset firstEffect
        // and lastEffect since they're on every node, not just the effectful
        // ones. So we have to clean everything as we reuse nodes anyway.
        nextEffect.nextEffect = null;
        // Ensure that we reset the effectTag here so that we can rely on effect
        // tags to reason about the current life-cycle.
        nextEffect = next;
      }
    }

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

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

    function commitRoot(finishedWork) {
      isWorking = true;
      isCommitting = true;
      startCommitTimer();

      var root = finishedWork.stateNode;
      !(root.current !== finishedWork) ? invariant(false, 'Cannot commit the same tree as before. This is probably a bug related to the return field. This error is likely caused by a bug in React. Please file an issue.') : void 0;
      var committedExpirationTime = root.pendingCommitExpirationTime;
      !(committedExpirationTime !== NoWork) ? invariant(false, 'Cannot commit an incomplete root. This error is likely caused by a bug in React. Please file an issue.') : void 0;
      root.pendingCommitExpirationTime = NoWork;

      var currentTime = recalculateCurrentTime();

      // Reset this to null before calling lifecycles
      ReactCurrentOwner.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;
        {
          invokeGuardedCallback(null, commitBeforeMutationLifecycles, null);
          if (hasCaughtError()) {
            didError = true;
            error = clearCaughtError();
          }
        }
        if (didError) {
          !(nextEffect !== null) ? invariant(false, 'Should have next effect. This error is likely caused by a bug in React. Please file an issue.') : void 0;
          onCommitPhaseError(nextEffect, error);
          // Clean-up
          if (nextEffect !== null) {
            nextEffect = nextEffect.nextEffect;
          }
        }
      }
      stopCommitSnapshotEffectsTimer();

      // 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;
        {
          invokeGuardedCallback(null, commitAllHostEffects, null);
          if (hasCaughtError()) {
            _didError = true;
            _error = clearCaughtError();
          }
        }
        if (_didError) {
          !(nextEffect !== null) ? invariant(false, 'Should have next effect. This error is likely caused by a bug in React. Please file an issue.') : void 0;
          onCommitPhaseError(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;
        {
          invokeGuardedCallback(null, commitAllLifeCycles, null, root, currentTime, committedExpirationTime);
          if (hasCaughtError()) {
            _didError2 = true;
            _error2 = clearCaughtError();
          }
        }
        if (_didError2) {
          !(nextEffect !== null) ? invariant(false, 'Should have next effect. This error is likely caused by a bug in React. Please file an issue.') : void 0;
          onCommitPhaseError(nextEffect, _error2);
          if (nextEffect !== null) {
            nextEffect = nextEffect.nextEffect;
          }
        }
      }

      isCommitting = false;
      isWorking = false;
      stopCommitLifeCyclesTimer();
      stopCommitTimer();
      if (typeof onCommitRoot === 'function') {
        onCommitRoot(finishedWork.stateNode);
      }
      if (ReactFiberInstrumentation_1.debugTool) {
        ReactFiberInstrumentation_1.debugTool.onCommitWork(finishedWork);
      }

      var remainingTime = root.current.expirationTime;
      if (remainingTime === NoWork) {
        // If there's no remaining work, we can clear the set of already failed
        // error boundaries.
        legacyErrorBoundariesThatAlreadyFailed = null;
      }
      return remainingTime;
    }

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

      // Check for pending updates.
      var newExpirationTime = getUpdateExpirationTime(workInProgress);

      // TODO: Calls need to visit stateNode

      // Bubble up the earliest expiration time.
      var child = workInProgress.child;
      while (child !== null) {
        if (child.expirationTime !== NoWork && (newExpirationTime === NoWork || newExpirationTime > child.expirationTime)) {
          newExpirationTime = child.expirationTime;
        }
        child = child.sibling;
      }
      workInProgress.expirationTime = newExpirationTime;
    }

    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 = workInProgress.alternate;
        {
          ReactDebugCurrentFiber.setCurrentFiber(workInProgress);
        }

        var returnFiber = workInProgress['return'];
        var siblingFiber = workInProgress.sibling;

        if ((workInProgress.effectTag & Incomplete) === NoEffect) {
          // This fiber completed.
          var next = completeWork(current, workInProgress, nextRenderExpirationTime);
          stopWorkTimer(workInProgress);
          resetExpirationTime(workInProgress, nextRenderExpirationTime);
          {
            ReactDebugCurrentFiber.resetCurrentFiber();
          }

          if (next !== null) {
            stopWorkTimer(workInProgress);
            if (ReactFiberInstrumentation_1.debugTool) {
              ReactFiberInstrumentation_1.debugTool.onCompleteWork(workInProgress);
            }
            // If completing this work spawned new work, do that next. We'll come
            // back here again.
            return next;
          }

          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 (ReactFiberInstrumentation_1.debugTool) {
            ReactFiberInstrumentation_1.debugTool.onCompleteWork(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.
            isRootReadyForCommit = true;
            return null;
          }
        } else {
          // 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);
          // 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);
          }

          {
            ReactDebugCurrentFiber.resetCurrentFiber();
          }

          if (_next !== null) {
            stopWorkTimer(workInProgress);
            if (ReactFiberInstrumentation_1.debugTool) {
              ReactFiberInstrumentation_1.debugTool.onCompleteWork(workInProgress);
            }
            // If completing this work spawned new work, do that next. We'll come
            // back here again.
            // Since we're restarting, remove anything that is not a host effect
            // from the effect tag.
            _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 (ReactFiberInstrumentation_1.debugTool) {
            ReactFiberInstrumentation_1.debugTool.onCompleteWork(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 {
            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 = workInProgress.alternate;

      // See if beginning this work spawns more work.
      startWorkTimer(workInProgress);
      {
        ReactDebugCurrentFiber.setCurrentFiber(workInProgress);
      }

      if (replayFailedUnitOfWorkWithInvokeGuardedCallback) {
        stashedWorkInProgressProperties = assignFiberPropertiesInDEV(stashedWorkInProgressProperties, workInProgress);
      }
      var next = beginWork(current, workInProgress, nextRenderExpirationTime);
      {
        ReactDebugCurrentFiber.resetCurrentFiber();
        if (isReplayingFailedUnitOfWork) {
          // Currently replaying a failed unit of work. This should be unreachable,
          // because the render phase is meant to be idempotent, and it should
          // have thrown again. Since it didn't, rethrow the original error, so
          // React's internal stack is not misaligned.
          rethrowOriginalError();
        }
      }
      if (ReactFiberInstrumentation_1.debugTool) {
        ReactFiberInstrumentation_1.debugTool.onBeginWork(workInProgress);
      }

      if (next === null) {
        // If this doesn't spawn new work, complete the current work.
        next = completeUnitOfWork(workInProgress);
      }

      ReactCurrentOwner.current = null;

      return next;
    }

    function workLoop(isAsync) {
      if (!isAsync) {
        // Flush all expired work.
        while (nextUnitOfWork !== null) {
          nextUnitOfWork = performUnitOfWork(nextUnitOfWork);
        }
      } else {
        // Flush asynchronous work until the deadline runs out of time.
        while (nextUnitOfWork !== null && !shouldYield()) {
          nextUnitOfWork = performUnitOfWork(nextUnitOfWork);
        }
      }
    }

    function renderRoot(root, expirationTime, isAsync) {
      !!isWorking ? invariant(false, 'renderRoot was called recursively. This error is likely caused by a bug in React. Please file an issue.') : void 0;
      isWorking = true;

      // 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;
      }

      var didFatal = false;

      startWorkLoopTimer(nextUnitOfWork);

      do {
        try {
          workLoop(isAsync);
        } catch (thrownValue) {
          if (nextUnitOfWork === null) {
            // This is a fatal error.
            didFatal = true;
            onUncaughtError(thrownValue);
            break;
          }

          if (replayFailedUnitOfWorkWithInvokeGuardedCallback) {
            var failedUnitOfWork = nextUnitOfWork;
            replayUnitOfWork(failedUnitOfWork, thrownValue, isAsync);
          }

          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);
            break;
          }
          throwException(returnFiber, sourceFiber, thrownValue);
          nextUnitOfWork = completeUnitOfWork(sourceFiber);
        }
        break;
      } while (true);

      // We're done performing work. Time to clean up.
      var didCompleteRoot = false;
      isWorking = false;

      // Yield back to main thread.
      if (didFatal) {
        stopWorkLoopTimer(interruptedBy, didCompleteRoot);
        interruptedBy = null;
        // There was a fatal error.
        {
          stack.resetStackAfterFatalErrorInDev();
        }
        return null;
      } else if (nextUnitOfWork === null) {
        // We reached the root.
        if (isRootReadyForCommit) {
          didCompleteRoot = true;
          stopWorkLoopTimer(interruptedBy, didCompleteRoot);
          interruptedBy = null;
          // The root successfully completed. It's ready for commit.
          root.pendingCommitExpirationTime = expirationTime;
          var finishedWork = root.current.alternate;
          return finishedWork;
        } else {
          // The root did not complete.
          stopWorkLoopTimer(interruptedBy, didCompleteRoot);
          interruptedBy = null;
          invariant(false, 'Expired work should have completed. This error is likely caused by a bug in React. Please file an issue.');
        }
      } else {
        stopWorkLoopTimer(interruptedBy, didCompleteRoot);
        interruptedBy = null;
        // There's more work to do, but we ran out of time. Yield back to
        // the renderer.
        return null;
      }
    }

    function scheduleCapture(sourceFiber, boundaryFiber, value, expirationTime) {
      // TODO: We only support dispatching errors.
      var capturedValue = createCapturedValue(value, sourceFiber);
      var update = {
        expirationTime: expirationTime,
        partialState: null,
        callback: null,
        isReplace: false,
        isForced: false,
        capturedValue: capturedValue,
        next: null
      };
      insertUpdateIntoFiber(boundaryFiber, update);
      scheduleWork(boundaryFiber, expirationTime);
    }

    function dispatch(sourceFiber, value, expirationTime) {
      !(!isWorking || isCommitting) ? invariant(false, 'dispatch: Cannot dispatch during the render phase.') : void 0;

      // TODO: Handle arrays

      var fiber = sourceFiber['return'];
      while (fiber !== null) {
        switch (fiber.tag) {
          case ClassComponent:
            var ctor = fiber.type;
            var instance = fiber.stateNode;
            if (typeof ctor.getDerivedStateFromCatch === 'function' || typeof instance.componentDidCatch === 'function' && !isAlreadyFailedLegacyErrorBoundary(instance)) {
              scheduleCapture(sourceFiber, fiber, value, expirationTime);
              return;
            }
            break;
          // TODO: Handle async boundaries
          case HostRoot:
            scheduleCapture(sourceFiber, fiber, value, 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.
        scheduleCapture(sourceFiber, sourceFiber, value, expirationTime);
      }
    }

    function onCommitPhaseError(fiber, error) {
      return dispatch(fiber, error, Sync);
    }

    function computeAsyncExpiration(currentTime) {
      // Given the current clock time, returns an expiration time. We use rounding
      // to batch like updates together.
      // Should complete within ~1000ms. 1200ms max.
      var expirationMs = 5000;
      var bucketSizeMs = 250;
      return computeExpirationBucket(currentTime, expirationMs, bucketSizeMs);
    }

    function computeInteractiveExpiration(currentTime) {
      var expirationMs = void 0;
      // 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.
      {
        // Should complete within ~500ms. 600ms max.
        expirationMs = 500;
      }
      var bucketSizeMs = 100;
      return computeExpirationBucket(currentTime, expirationMs, bucketSizeMs);
    }

    // Creates a unique async expiration time.
    function computeUniqueAsyncExpiration() {
      var currentTime = recalculateCurrentTime();
      var result = computeAsyncExpiration(currentTime);
      if (result <= lastUniqueAsyncExpiration) {
        // Since we assume the current time monotonically increases, we only hit
        // this branch when computeUniqueAsyncExpiration is fired multiple times
        // within a 200ms window (or whatever the async bucket size is).
        result = lastUniqueAsyncExpiration + 1;
      }
      lastUniqueAsyncExpiration = result;
      return lastUniqueAsyncExpiration;
    }

    function computeExpirationForFiber(fiber) {
      var expirationTime = void 0;
      if (expirationContext !== NoWork) {
        // An explicit expiration context was set;
        expirationTime = expirationContext;
      } else if (isWorking) {
        if (isCommitting) {
          // Updates that occur during the commit phase should have sync priority
          // by default.
          expirationTime = Sync;
        } else {
          // Updates during the render phase should expire at the same time as
          // the work that is being rendered.
          expirationTime = nextRenderExpirationTime;
        }
      } else {
        // No explicit expiration context was set, and we're not currently
        // performing work. Calculate a new expiration time.
        if (fiber.mode & AsyncMode) {
          if (isBatchingInteractiveUpdates) {
            // This is an interactive update
            var currentTime = recalculateCurrentTime();
            expirationTime = computeInteractiveExpiration(currentTime);
          } else {
            // This is an async update
            var _currentTime = recalculateCurrentTime();
            expirationTime = computeAsyncExpiration(_currentTime);
          }
        } else {
          // This is a sync update
          expirationTime = Sync;
        }
      }
      if (isBatchingInteractiveUpdates) {
        // This is an interactive update. Keep track of the lowest pending
        // interactive expiration time. This allows us to synchronously flush
        // all interactive updates when needed.
        if (lowestPendingInteractiveExpirationTime === NoWork || expirationTime > lowestPendingInteractiveExpirationTime) {
          lowestPendingInteractiveExpirationTime = expirationTime;
        }
      }
      return expirationTime;
    }

    function scheduleWork(fiber, expirationTime) {
      return scheduleWorkImpl(fiber, expirationTime, false);
    }

    function scheduleWorkImpl(fiber, expirationTime, isErrorRecovery) {
      recordScheduleUpdate();

      {
        if (!isErrorRecovery && fiber.tag === ClassComponent) {
          var instance = fiber.stateNode;
          warnAboutInvalidUpdates(instance);
        }
      }

      var node = fiber;
      while (node !== null) {
        // Walk the parent path to the root and update each node's
        // expiration time.
        if (node.expirationTime === NoWork || node.expirationTime > expirationTime) {
          node.expirationTime = expirationTime;
        }
        if (node.alternate !== null) {
          if (node.alternate.expirationTime === NoWork || node.alternate.expirationTime > expirationTime) {
            node.alternate.expirationTime = expirationTime;
          }
        }
        if (node['return'] === null) {
          if (node.tag === HostRoot) {
            var root = node.stateNode;
            if (!isWorking && nextRenderExpirationTime !== NoWork && expirationTime < nextRenderExpirationTime) {
              // This is an interruption. (Used for performance tracking.)
              interruptedBy = fiber;
              resetStack();
            }
            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 ||
            // ...unless this is a different root than the one we're rendering.
            nextRoot !== root) {
              // Add this root to the root schedule.
              requestWork(root, expirationTime);
            }
            if (nestedUpdateCount > NESTED_UPDATE_LIMIT) {
              invariant(false, 'Maximum update depth exceeded. This can happen when a component repeatedly calls setState inside componentWillUpdate or componentDidUpdate. React limits the number of nested updates to prevent infinite loops.');
            }
          } else {
            {
              if (!isErrorRecovery && fiber.tag === ClassComponent) {
                warnAboutUpdateOnUnmounted(fiber);
              }
            }
            return;
          }
        }
        node = node['return'];
      }
    }

    function recalculateCurrentTime() {
      // Subtract initial time so it fits inside 32bits
      mostRecentCurrentTimeMs = now() - originalStartTimeMs;
      mostRecentCurrentTime = msToExpirationTime(mostRecentCurrentTimeMs);
      return mostRecentCurrentTime;
    }

    function deferredUpdates(fn) {
      var previousExpirationContext = expirationContext;
      var currentTime = recalculateCurrentTime();
      expirationContext = computeAsyncExpiration(currentTime);
      try {
        return fn();
      } finally {
        expirationContext = previousExpirationContext;
      }
    }
    function syncUpdates(fn, a, b, c, d) {
      var previousExpirationContext = expirationContext;
      expirationContext = Sync;
      try {
        return fn(a, b, c, d);
      } finally {
        expirationContext = previousExpirationContext;
      }
    }

    // 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 = -1;
    var isRendering = false;
    var nextFlushedRoot = null;
    var nextFlushedExpirationTime = NoWork;
    var lowestPendingInteractiveExpirationTime = NoWork;
    var deadlineDidExpire = false;
    var hasUnhandledError = false;
    var unhandledError = null;
    var deadline = null;

    var isBatchingUpdates = false;
    var isUnbatchingUpdates = false;
    var isBatchingInteractiveUpdates = false;

    var completedBatches = null;

    // Use these to prevent an infinite loop of nested updates
    var NESTED_UPDATE_LIMIT = 1000;
    var nestedUpdateCount = 0;

    var timeHeuristicForUnitOfWork = 1;

    function scheduleCallbackWithExpiration(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 {
          // Existing callback has insufficient timeout. Cancel and schedule a
          // new one.
          cancelDeferredCallback(callbackID);
        }
        // The request callback timer is already running. Don't start a new one.
      } else {
        startRequestCallbackTimer();
      }

      // Compute a timeout for the given expiration time.
      var currentMs = now() - originalStartTimeMs;
      var expirationMs = expirationTimeToMs(expirationTime);
      var timeout = expirationMs - currentMs;

      callbackExpirationTime = expirationTime;
      callbackID = scheduleDeferredCallback(performAsyncWork, { timeout: timeout });
    }

    // 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 {
        scheduleCallbackWithExpiration(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.remainingExpirationTime = 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.remainingExpirationTime;
        if (remainingExpirationTime === NoWork || expirationTime < remainingExpirationTime) {
          // Update the priority.
          root.remainingExpirationTime = expirationTime;
        }
      }
    }

    function findHighestPriorityRoot() {
      var highestPriorityWork = NoWork;
      var highestPriorityRoot = null;
      if (lastScheduledRoot !== null) {
        var previousScheduledRoot = lastScheduledRoot;
        var root = firstScheduledRoot;
        while (root !== null) {
          var remainingExpirationTime = root.remainingExpirationTime;
          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) ? invariant(false, 'Should have a previous and last root. This error is likely caused by a bug in React. Please file an issue.') : 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 (highestPriorityWork === NoWork || remainingExpirationTime < highestPriorityWork) {
              // Update the priority, if it's higher
              highestPriorityWork = remainingExpirationTime;
              highestPriorityRoot = root;
            }
            if (root === lastScheduledRoot) {
              break;
            }
            previousScheduledRoot = root;
            root = root.nextScheduledRoot;
          }
        }
      }

      // 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.
      var previousFlushedRoot = nextFlushedRoot;
      if (previousFlushedRoot !== null && previousFlushedRoot === highestPriorityRoot && highestPriorityWork === Sync) {
        nestedUpdateCount++;
      } else {
        // Reset whenever we switch roots.
        nestedUpdateCount = 0;
      }
      nextFlushedRoot = highestPriorityRoot;
      nextFlushedExpirationTime = highestPriorityWork;
    }

    function performAsyncWork(dl) {
      performWork(NoWork, true, dl);
    }

    function performSyncWork() {
      performWork(Sync, false, null);
    }

    function performWork(minExpirationTime, isAsync, dl) {
      deadline = dl;

      // Keep working on roots until there's no more work, or until the we reach
      // the deadline.
      findHighestPriorityRoot();

      if (enableUserTimingAPI && deadline !== null) {
        var didExpire = nextFlushedExpirationTime < recalculateCurrentTime();
        var timeout = expirationTimeToMs(nextFlushedExpirationTime);
        stopRequestCallbackTimer(didExpire, timeout);
      }

      if (isAsync) {
        while (nextFlushedRoot !== null && nextFlushedExpirationTime !== NoWork && (minExpirationTime === NoWork || minExpirationTime >= nextFlushedExpirationTime) && (!deadlineDidExpire || recalculateCurrentTime() >= nextFlushedExpirationTime)) {
          performWorkOnRoot(nextFlushedRoot, nextFlushedExpirationTime, !deadlineDidExpire);
          findHighestPriorityRoot();
        }
      } else {
        while (nextFlushedRoot !== null && nextFlushedExpirationTime !== NoWork && (minExpirationTime === 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 (deadline !== null) {
        callbackExpirationTime = NoWork;
        callbackID = -1;
      }
      // If there's work left over, schedule a new callback.
      if (nextFlushedExpirationTime !== NoWork) {
        scheduleCallbackWithExpiration(nextFlushedExpirationTime);
      }

      // Clean-up.
      deadline = null;
      deadlineDidExpire = false;

      finishRendering();
    }

    function flushRoot(root, expirationTime) {
      !!isRendering ? invariant(false, 'work.commit(): Cannot commit while already rendering. This likely means you attempted to commit from inside a lifecycle method.') : 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();
      finishRendering();
    }

    function finishRendering() {
      nestedUpdateCount = 0;

      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, isAsync) {
      !!isRendering ? invariant(false, 'performWorkOnRoot was called recursively. This error is likely caused by a bug in React. Please file an issue.') : void 0;

      isRendering = true;

      // Check if this is async work or sync/expired work.
      if (!isAsync) {
        // Flush sync 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;
          finishedWork = renderRoot(root, expirationTime, false);
          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;
          _finishedWork = renderRoot(root, expirationTime, true);
          if (_finishedWork !== null) {
            // We've completed the root. Check the deadline one more time
            // before committing.
            if (!shouldYield()) {
              // 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.remainingExpirationTime = NoWork;
          return;
        }
      }

      // Commit the root.
      root.finishedWork = null;
      root.remainingExpirationTime = commitRoot(finishedWork);
    }

    // When working on async work, the reconciler asks the renderer if it should
    // yield execution. For DOM, we implement this with requestIdleCallback.
    function shouldYield() {
      if (deadline === null) {
        return false;
      }
      if (deadline.timeRemaining() > timeHeuristicForUnitOfWork) {
        // Disregard deadline.didTimeout. Only expired work should be flushed
        // during a timeout. This path is only hit for non-expired work.
        return false;
      }
      deadlineDidExpire = true;
      return true;
    }

    function onUncaughtError(error) {
      !(nextFlushedRoot !== null) ? invariant(false, 'Should be working on a root. This error is likely caused by a bug in React. Please file an issue.') : void 0;
      // Unschedule this root so we don't work on it again until there's
      // another update.
      nextFlushedRoot.remainingExpirationTime = 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 inside
    // the reconciler.
    function unbatchedUpdates(fn, a) {
      if (isBatchingUpdates && !isUnbatchingUpdates) {
        isUnbatchingUpdates = true;
        try {
          return fn(a);
        } finally {
          isUnbatchingUpdates = false;
        }
      }
      return fn(a);
    }

    // TODO: Batching should be implemented at the renderer level, not within
    // the reconciler.
    function flushSync(fn, a) {
      !!isRendering ? invariant(false, 'flushSync was called from inside a lifecycle method. It cannot be called when React is already rendering.') : void 0;
      var previousIsBatchingUpdates = isBatchingUpdates;
      isBatchingUpdates = true;
      try {
        return syncUpdates(fn, a);
      } finally {
        isBatchingUpdates = previousIsBatchingUpdates;
        performSyncWork();
      }
    }

    function interactiveUpdates(fn, a, b) {
      if (isBatchingInteractiveUpdates) {
        return fn(a, b);
      }
      // If there are any pending interactive updates, synchronously flush them.
      // This needs to happen before we read any handlers, because the effect of
      // the previous event may influence which handlers are called during
      // this event.
      if (!isBatchingUpdates && !isRendering && lowestPendingInteractiveExpirationTime !== NoWork) {
        // Synchronously flush pending interactive updates.
        performWork(lowestPendingInteractiveExpirationTime, false, null);
        lowestPendingInteractiveExpirationTime = NoWork;
      }
      var previousIsBatchingInteractiveUpdates = isBatchingInteractiveUpdates;
      var previousIsBatchingUpdates = isBatchingUpdates;
      isBatchingInteractiveUpdates = true;
      isBatchingUpdates = true;
      try {
        return fn(a, b);
      } finally {
        isBatchingInteractiveUpdates = previousIsBatchingInteractiveUpdates;
        isBatchingUpdates = previousIsBatchingUpdates;
        if (!isBatchingUpdates && !isRendering) {
          performSyncWork();
        }
      }
    }

    function flushInteractiveUpdates() {
      if (!isRendering && lowestPendingInteractiveExpirationTime !== NoWork) {
        // Synchronously flush pending interactive updates.
        performWork(lowestPendingInteractiveExpirationTime, false, null);
        lowestPendingInteractiveExpirationTime = NoWork;
      }
    }

    function flushControlled(fn) {
      var previousIsBatchingUpdates = isBatchingUpdates;
      isBatchingUpdates = true;
      try {
        syncUpdates(fn);
      } finally {
        isBatchingUpdates = previousIsBatchingUpdates;
        if (!isBatchingUpdates && !isRendering) {
          performWork(Sync, false, null);
        }
      }
    }

    return {
      recalculateCurrentTime: recalculateCurrentTime,
      computeExpirationForFiber: computeExpirationForFiber,
      scheduleWork: scheduleWork,
      requestWork: requestWork,
      flushRoot: flushRoot,
      batchedUpdates: batchedUpdates,
      unbatchedUpdates: unbatchedUpdates,
      flushSync: flushSync,
      flushControlled: flushControlled,
      deferredUpdates: deferredUpdates,
      syncUpdates: syncUpdates,
      interactiveUpdates: interactiveUpdates,
      flushInteractiveUpdates: flushInteractiveUpdates,
      computeUniqueAsyncExpiration: computeUniqueAsyncExpiration,
      legacyContext: legacyContext
    };
  };

  var didWarnAboutNestedUpdates = void 0;

  {
    didWarnAboutNestedUpdates = false;
  }

  // 0 is PROD, 1 is DEV.
  // Might add PROFILE later.


  var ReactFiberReconciler = function (config) {
    var getPublicInstance = config.getPublicInstance;

    var _ReactFiberScheduler = ReactFiberScheduler(config),
        computeUniqueAsyncExpiration = _ReactFiberScheduler.computeUniqueAsyncExpiration,
        recalculateCurrentTime = _ReactFiberScheduler.recalculateCurrentTime,
        computeExpirationForFiber = _ReactFiberScheduler.computeExpirationForFiber,
        scheduleWork = _ReactFiberScheduler.scheduleWork,
        requestWork = _ReactFiberScheduler.requestWork,
        flushRoot = _ReactFiberScheduler.flushRoot,
        batchedUpdates = _ReactFiberScheduler.batchedUpdates,
        unbatchedUpdates = _ReactFiberScheduler.unbatchedUpdates,
        flushSync = _ReactFiberScheduler.flushSync,
        flushControlled = _ReactFiberScheduler.flushControlled,
        deferredUpdates = _ReactFiberScheduler.deferredUpdates,
        syncUpdates = _ReactFiberScheduler.syncUpdates,
        interactiveUpdates = _ReactFiberScheduler.interactiveUpdates,
        flushInteractiveUpdates = _ReactFiberScheduler.flushInteractiveUpdates,
        legacyContext = _ReactFiberScheduler.legacyContext;

    var findCurrentUnmaskedContext = legacyContext.findCurrentUnmaskedContext,
        isContextProvider = legacyContext.isContextProvider,
        processChildContext = legacyContext.processChildContext;


    function getContextForSubtree(parentComponent) {
      if (!parentComponent) {
        return emptyObject;
      }

      var fiber = get(parentComponent);
      var parentContext = findCurrentUnmaskedContext(fiber);
      return isContextProvider(fiber) ? processChildContext(fiber, parentContext) : parentContext;
    }

    function scheduleRootUpdate(current, element, currentTime, expirationTime, callback) {
      {
        if (ReactDebugCurrentFiber.phase === 'render' && ReactDebugCurrentFiber.current !== null && !didWarnAboutNestedUpdates) {
          didWarnAboutNestedUpdates = true;
          warning(false, 'Render methods should be a pure function of props and state; ' + 'triggering nested component updates from render is not allowed. ' + 'If necessary, trigger nested updates in componentDidUpdate.\n\n' + 'Check the render method of %s.', getComponentName(ReactDebugCurrentFiber.current) || 'Unknown');
        }
      }

      callback = callback === undefined ? null : callback;
      {
        !(callback === null || typeof callback === 'function') ? warning(false, 'render(...): Expected the last optional `callback` argument to be a ' + 'function. Instead received: %s.', callback) : void 0;
      }

      var update = {
        expirationTime: expirationTime,
        partialState: { element: element },
        callback: callback,
        isReplace: false,
        isForced: false,
        capturedValue: null,
        next: null
      };
      insertUpdateIntoFiber(current, update);
      scheduleWork(current, expirationTime);

      return expirationTime;
    }

    function updateContainerAtExpirationTime(element, container, parentComponent, currentTime, expirationTime, callback) {
      // TODO: If this is a nested container, this won't be the root.
      var current = container.current;

      {
        if (ReactFiberInstrumentation_1.debugTool) {
          if (current.alternate === null) {
            ReactFiberInstrumentation_1.debugTool.onMountContainer(container);
          } else if (element === null) {
            ReactFiberInstrumentation_1.debugTool.onUnmountContainer(container);
          } else {
            ReactFiberInstrumentation_1.debugTool.onUpdateContainer(container);
          }
        }
      }

      var context = getContextForSubtree(parentComponent);
      if (container.context === null) {
        container.context = context;
      } else {
        container.pendingContext = context;
      }

      return scheduleRootUpdate(current, element, currentTime, expirationTime, callback);
    }

    function findHostInstance(component) {
      var fiber = get(component);
      if (fiber === undefined) {
        if (typeof component.render === 'function') {
          invariant(false, 'Unable to find node on an unmounted component.');
        } else {
          invariant(false, 'Argument appears to not be a ReactComponent. Keys: %s', Object.keys(component));
        }
      }
      var hostFiber = findCurrentHostFiber(fiber);
      if (hostFiber === null) {
        return null;
      }
      return hostFiber.stateNode;
    }

    return {
      createContainer: function (containerInfo, isAsync, hydrate) {
        return createFiberRoot(containerInfo, isAsync, hydrate);
      },
      updateContainer: function (element, container, parentComponent, callback) {
        var current = container.current;
        var currentTime = recalculateCurrentTime();
        var expirationTime = computeExpirationForFiber(current);
        return updateContainerAtExpirationTime(element, container, parentComponent, currentTime, expirationTime, callback);
      },
      updateContainerAtExpirationTime: function (element, container, parentComponent, expirationTime, callback) {
        var currentTime = recalculateCurrentTime();
        return updateContainerAtExpirationTime(element, container, parentComponent, currentTime, expirationTime, callback);
      },


      flushRoot: flushRoot,

      requestWork: requestWork,

      computeUniqueAsyncExpiration: computeUniqueAsyncExpiration,

      batchedUpdates: batchedUpdates,

      unbatchedUpdates: unbatchedUpdates,

      deferredUpdates: deferredUpdates,

      syncUpdates: syncUpdates,

      interactiveUpdates: interactiveUpdates,

      flushInteractiveUpdates: flushInteractiveUpdates,

      flushControlled: flushControlled,

      flushSync: flushSync,

      getPublicRootInstance: function (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;
        }
      },


      findHostInstance: findHostInstance,

      findHostInstanceWithNoPortals: function (fiber) {
        var hostFiber = findCurrentHostFiberWithNoPortals(fiber);
        if (hostFiber === null) {
          return null;
        }
        return hostFiber.stateNode;
      },
      injectIntoDevTools: function (devToolsConfig) {
        var findFiberByHostInstance = devToolsConfig.findFiberByHostInstance;

        return injectInternals(_assign({}, devToolsConfig, {
          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);
          }
        }));
      }
    };
  };

  var ReactFiberReconciler$1 = Object.freeze({
    default: ReactFiberReconciler
  });

  var ReactFiberReconciler$2 = ( ReactFiberReconciler$1 && ReactFiberReconciler ) || ReactFiberReconciler$1;

  // TODO: bundle Flow types with the package.



  // TODO: decide on the top-level export form.
  // This is hacky but makes it work with both Rollup and Jest.
  var reactReconciler = ReactFiberReconciler$2['default'] ? ReactFiberReconciler$2['default'] : ReactFiberReconciler$2;

  module.exports = reactReconciler;
      return ($$$reconciler || ($$$reconciler = module.exports))(config);
    };
  }
  });

  var reactReconciler = createCommonjsModule(function (module) {

  {
    module.exports = reactReconciler_development;
  }
  });

  var global$1 = (typeof global !== "undefined" ? global :
              typeof self !== "undefined" ? self :
              typeof window !== "undefined" ? window : {});

  // shim for using process in browser
  // based off https://github.com/defunctzombie/node-process/blob/master/browser.js

  function defaultSetTimout() {
      throw new Error('setTimeout has not been defined');
  }
  function defaultClearTimeout () {
      throw new Error('clearTimeout has not been defined');
  }
  var cachedSetTimeout = defaultSetTimout;
  var cachedClearTimeout = defaultClearTimeout;
  if (typeof global$1.setTimeout === 'function') {
      cachedSetTimeout = setTimeout;
  }
  if (typeof global$1.clearTimeout === 'function') {
      cachedClearTimeout = clearTimeout;
  }

  function runTimeout(fun) {
      if (cachedSetTimeout === setTimeout) {
          //normal enviroments in sane situations
          return setTimeout(fun, 0);
      }
      // if setTimeout wasn't available but was latter defined
      if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
          cachedSetTimeout = setTimeout;
          return setTimeout(fun, 0);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedSetTimeout(fun, 0);
      } catch(e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
              return cachedSetTimeout.call(null, fun, 0);
          } catch(e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
              return cachedSetTimeout.call(this, fun, 0);
          }
      }


  }
  function runClearTimeout(marker) {
      if (cachedClearTimeout === clearTimeout) {
          //normal enviroments in sane situations
          return clearTimeout(marker);
      }
      // if clearTimeout wasn't available but was latter defined
      if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
          cachedClearTimeout = clearTimeout;
          return clearTimeout(marker);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedClearTimeout(marker);
      } catch (e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
              return cachedClearTimeout.call(null, marker);
          } catch (e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
              // Some versions of I.E. have different rules for clearTimeout vs setTimeout
              return cachedClearTimeout.call(this, marker);
          }
      }



  }
  var queue = [];
  var draining = false;
  var currentQueue;
  var queueIndex = -1;

  function cleanUpNextTick() {
      if (!draining || !currentQueue) {
          return;
      }
      draining = false;
      if (currentQueue.length) {
          queue = currentQueue.concat(queue);
      } else {
          queueIndex = -1;
      }
      if (queue.length) {
          drainQueue();
      }
  }

  function drainQueue() {
      if (draining) {
          return;
      }
      var timeout = runTimeout(cleanUpNextTick);
      draining = true;

      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          while (++queueIndex < len) {
              if (currentQueue) {
                  currentQueue[queueIndex].run();
              }
          }
          queueIndex = -1;
          len = queue.length;
      }
      currentQueue = null;
      draining = false;
      runClearTimeout(timeout);
  }
  function nextTick(fun) {
      var args = new Array(arguments.length - 1);
      if (arguments.length > 1) {
          for (var i = 1; i < arguments.length; i++) {
              args[i - 1] = arguments[i];
          }
      }
      queue.push(new Item(fun, args));
      if (queue.length === 1 && !draining) {
          runTimeout(drainQueue);
      }
  }
  // v8 likes predictible objects
  function Item(fun, array) {
      this.fun = fun;
      this.array = array;
  }
  Item.prototype.run = function () {
      this.fun.apply(null, this.array);
  };
  var title = 'browser';
  var platform = 'browser';
  var browser = true;
  var env = {};
  var argv = [];
  var version$1 = ''; // empty string to avoid regexp issues
  var versions = {};
  var release = {};
  var config = {};

  function noop() {}

  var on = noop;
  var addListener = noop;
  var once = noop;
  var off = noop;
  var removeListener = noop;
  var removeAllListeners = noop;
  var emit = noop;

  function binding(name) {
      throw new Error('process.binding is not supported');
  }

  function cwd () { return '/' }
  function chdir (dir) {
      throw new Error('process.chdir is not supported');
  }function umask() { return 0; }

  // from https://github.com/kumavis/browser-process-hrtime/blob/master/index.js
  var performance$1 = global$1.performance || {};
  var performanceNow =
    performance$1.now        ||
    performance$1.mozNow     ||
    performance$1.msNow      ||
    performance$1.oNow       ||
    performance$1.webkitNow  ||
    function(){ return (new Date()).getTime() };

  // generate timestamp or delta
  // see http://nodejs.org/api/process.html#process_process_hrtime
  function hrtime(previousTimestamp){
    var clocktime = performanceNow.call(performance$1)*1e-3;
    var seconds = Math.floor(clocktime);
    var nanoseconds = Math.floor((clocktime%1)*1e9);
    if (previousTimestamp) {
      seconds = seconds - previousTimestamp[0];
      nanoseconds = nanoseconds - previousTimestamp[1];
      if (nanoseconds<0) {
        seconds--;
        nanoseconds += 1e9;
      }
    }
    return [seconds,nanoseconds]
  }

  var startTime = new Date();
  function uptime() {
    var currentTime = new Date();
    var dif = currentTime - startTime;
    return dif / 1000;
  }

  var process = {
    nextTick: nextTick,
    title: title,
    browser: browser,
    env: env,
    argv: argv,
    version: version$1,
    versions: versions,
    on: on,
    addListener: addListener,
    once: once,
    off: off,
    removeListener: removeListener,
    removeAllListeners: removeAllListeners,
    emit: emit,
    binding: binding,
    cwd: cwd,
    chdir: chdir,
    umask: umask,
    hrtime: hrtime,
    platform: platform,
    release: release,
    config: config,
    uptime: uptime
  };

  var performanceNow$1 = createCommonjsModule(function (module) {
  // Generated by CoffeeScript 1.12.2
  (function() {
    var getNanoSeconds, hrtime$$1, loadTime, moduleLoadTime, nodeLoadTime, upTime;

    if ((typeof performance !== "undefined" && performance !== null) && performance.now) {
      module.exports = function() {
        return performance.now();
      };
    } else if ((typeof process !== "undefined" && process !== null) && process.hrtime) {
      module.exports = function() {
        return (getNanoSeconds() - nodeLoadTime) / 1e6;
      };
      hrtime$$1 = process.hrtime;
      getNanoSeconds = function() {
        var hr;
        hr = hrtime$$1();
        return hr[0] * 1e9 + hr[1];
      };
      moduleLoadTime = getNanoSeconds();
      upTime = process.uptime() * 1e9;
      nodeLoadTime = moduleLoadTime - upTime;
    } else if (Date.now) {
      module.exports = function() {
        return Date.now() - loadTime;
      };
      loadTime = Date.now();
    } else {
      module.exports = function() {
        return new Date().getTime() - loadTime;
      };
      loadTime = new Date().getTime();
    }

  }).call(commonjsGlobal);


  });

  // List of types supported by ReactPixiFiber
  var TYPES = {
    BITMAP_TEXT: "BitmapText",
    CONTAINER: "Container",
    GRAPHICS: "Graphics",
    PARTICLE_CONTAINER: "ParticleContainer",
    SPRITE: "Sprite",
    TEXT: "Text",
    TILING_SPRITE: "TilingSprite"
  };

  /* Helper Methods */

  var not = function not(fn) {
    return function () {
      return !fn.apply(undefined, arguments);
    };
  };

  var including = function including(props) {
    return function (key) {
      return props.indexOf(key) !== -1;
    };
  };

  function filterByKey(inputObject, filter) {
    var exportObject = {};

    Object.keys(inputObject).filter(filter).forEach(function (key) {
      exportObject[key] = inputObject[key];
    });

    return exportObject;
  }

  /* Concrete Helper Methods */

  var includingReservedProps = including(Object.keys(RESERVED_PROPS));

  /* PIXI related Methods */

  // Converts value to an array of coordinates
  function parsePoint(value) {
    var arr = [];
    if (typeof value === "undefined") {
      return arr;
    } else if (typeof value === "string") {
      arr = value.split(",");
    } else if (typeof value === "number") {
      arr = [value];
    } else if (Array.isArray(value)) {
      // shallow copy the array
      arr = value.slice();
    } else if (typeof value.x !== "undefined" && typeof value.y !== "undefined") {
      arr = [value.x, value.y];
    }

    return arr.map(Number);
  }

  function isPointType(value) {
    return value instanceof PIXI.Point || value instanceof PIXI.ObservablePoint;
  }

  // Set props on a DisplayObject by checking the type. If a PIXI.Point or
  // a PIXI.ObservablePoint is having its value set, then either a comma-separated
  // string with in the form of "x,y" or a size 2 array with index 0 being the x
  // coordinate and index 1 being the y coordinate.
  // See: https://github.com/Izzimach/react-pixi/blob/a25196251a13ed9bb116a8576d93e9fceac2a14c/src/ReactPIXI.js#L114
  function setPixiValue(instance, propName, value) {
    if (isPointType(instance[propName]) && isPointType(value)) {
      // Just copy the data if a Point type is being assigned to a Point type
      instance[propName].copy(value);
    } else if (isPointType(instance[propName])) {
      // Parse value if a non-Point type is being assigned to a Point type
      var coordinateData = parsePoint(value);

      invariant_1(typeof coordinateData !== "undefined" && coordinateData.length > 0 && coordinateData.length < 3, "The property `%s` is a PIXI.Point or PIXI.ObservablePoint and must be set to a comma-separated string of " + "either 1 or 2 coordinates, a 1 or 2 element array containing coordinates, or a PIXI Point/ObservablePoint. " + "If only one coordinate is given then X and Y will be set to the provided value. Received: `%s` of type `%s`.", propName, JSON.stringify(value), typeof value === "undefined" ? "undefined" : _typeof(value));

      instance[propName].set(coordinateData.shift(), coordinateData.shift());
    } else {
      // Just assign the value directly if a non-Point type is being assigned to a non-Point type
      instance[propName] = value;
    }
  }

  /* Render Methods */

  // TODO consider whitelisting props based on component type
  function defaultApplyProps(instance, oldProps, newProps) {
    Object.keys(newProps).filter(not(includingReservedProps)).forEach(function (propName) {
      var value = newProps[propName];

      // Set value if defined
      if (typeof value !== "undefined") {
        setPixiValue(instance, propName, value);
      } else if (typeof instance[propName] !== "undefined" && typeof DEFAULT_PROPS[propName] !== "undefined") {
        // Reset to default value (if it is defined) when display object had prop set and no longer has
        console.warn("setting default value: " + propName + " was " + instance[propName] + " is " + value + " for", instance);
        setPixiValue(instance, propName, DEFAULT_PROPS[propName]);
      } else {
        console.warn("ignoring prop: " + propName + " was " + instance[propName] + " is " + value + " for", instance);
      }
    });
  }

  function applyProps(instance, oldProps, newProps) {
    if (typeof instance._customApplyProps === "function") {
      instance._customApplyProps(instance, oldProps, newProps);
    } else {
      defaultApplyProps(instance, oldProps, newProps);
    }
  }

  // Calculate the diff between the two objects.
  // See: https://github.com/facebook/react/blob/97e2911/packages/react-dom/src/client/ReactDOMFiberComponent.js#L546
  function diffProps(pixiElement, type, lastRawProps, nextRawProps, rootContainerElement) {
    var updatePayload = null;

    var lastProps = lastRawProps;
    var nextProps = nextRawProps;
    var propKey = void 0;

    for (propKey in lastProps) {
      if (nextProps.hasOwnProperty(propKey) || !lastProps.hasOwnProperty(propKey) || lastProps[propKey] == null) {
        continue;
      }
      if (propKey === CHILDREN) ; else {
        // For all other deleted properties we add it to the queue. We use
        // the whitelist in the commit phase instead.
        (updatePayload = updatePayload || []).push(propKey, null);
      }
    }
    for (propKey in nextProps) {
      var nextProp = nextProps[propKey];
      var lastProp = lastProps != null ? lastProps[propKey] : undefined;
      if (!nextProps.hasOwnProperty(propKey) || nextProp === lastProp || nextProp == null && lastProp == null) {
        continue;
      }
      if (propKey === CHILDREN) ; else {
        // For any other property we always add it to the queue and then we
        // filter it out using the whitelist during the commit.
        (updatePayload = updatePayload || []).push(propKey, nextProp);
      }
    }
    return updatePayload;
  }

  /* PixiJS Renderer */

  function appendChild(parentInstance, child) {
    // TODO do we need to remove the child first if it's already added?
    parentInstance.removeChild(child);

    parentInstance.addChild(child);
    if (typeof child._customDidAttach === "function") {
      child._customDidAttach(child);
    }
  }

  function removeChild(parentInstance, child) {
    if (typeof child._customWillDetach === "function") {
      child._customWillDetach(child);
    }

    parentInstance.removeChild(child);

    child.destroy();
  }

  function insertBefore(parentInstance, child, beforeChild) {
    invariant_1(child !== beforeChild, "ReactPixiFiber cannot insert node before itself");

    var childExists = parentInstance.children.indexOf(child) !== -1;
    var index = parentInstance.getChildIndex(beforeChild);

    if (childExists) {
      parentInstance.setChildIndex(child, index);
    } else {
      parentInstance.addChildAt(child, index);
    }
  }

  function commitUpdate(instance, updatePayload, type, lastRawProps, nextRawProps, internalInstanceHandle) {
    // injected types need to have full control over passed props
    if (isInjectedType(type)) {
      applyProps(instance, lastRawProps, nextRawProps);
      return;
    }

    // updatePayload is in the form of [propKey1, propValue1, ...]
    var updatedPropKeys = including(updatePayload.filter(function (item, i) {
      return i % 2 === 0;
    }));
    var oldProps = filterByKey(lastRawProps, updatedPropKeys);
    var newProps = filterByKey(nextRawProps, updatedPropKeys);

    // regular components only receive props that have changed
    applyProps(instance, oldProps, newProps);
  }

  function createInstance(type, props, internalInstanceHandle) {
    var instance = void 0;

    switch (type) {
      case TYPES.BITMAP_TEXT:
        instance = new PIXI.extras.BitmapText(props.text, props.style);
        break;
      case TYPES.CONTAINER:
        instance = new PIXI.Container();
        break;
      case TYPES.GRAPHICS:
        instance = new PIXI.Graphics();
        break;
      case TYPES.PARTICLE_CONTAINER:
        instance = new PIXI.particles.ParticleContainer(props.maxSize, props.properties, props.batchSize, props.autoResize);
        break;
      case TYPES.SPRITE:
        instance = new PIXI.Sprite(props.texture);
        break;
      case TYPES.TEXT:
        instance = new PIXI.Text(props.text, props.style, props.canvas);
        break;
      case TYPES.TILING_SPRITE:
        instance = new PIXI.extras.TilingSprite(props.texture, props.width, props.height);
        break;
      default:
        instance = createInjectedTypeInstance(type, props, internalInstanceHandle, defaultApplyProps);
        break;
    }

    invariant_1(instance, "ReactPixiFiber does not support the type: `%s`.", type);

    applyProps(instance, {}, props);

    return instance;
  }

  function createTextInstance(text, rootContainerInstance, internalInstanceHandle) {
    invariant_1(false, "ReactPixiFiber does not support text instances. Use Text component instead.");
  }

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

  function getChildHostContext(parentHostContext, type) {
    return emptyObject_1;
  }

  function getRootHostContext(rootContainerInstance) {
    return emptyObject_1;
  }

  function getPublicInstance(inst) {
    return inst;
  }

  function prepareForCommit() {
    // Noop
  }

  function prepareUpdate(pixiElement, type, oldProps, newProps, rootContainerInstance, hostContext) {
    return diffProps(pixiElement, type, oldProps, newProps, rootContainerInstance);
  }

  function resetAfterCommit() {
    // Noop
  }

  function resetTextContent(pixiElement) {
    // Noop
  }

  function shouldDeprioritizeSubtree(type, props) {
    var isAlphaVisible = typeof props.alpha === "undefined" || props.alpha > 0;
    var isRenderable = typeof props.renderable === "undefined" || props.renderable === true;
    var isVisible = typeof props.visible === "undefined" || props.visible === true;

    return !(isAlphaVisible && isRenderable && isVisible);
  }

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

  function commitTextUpdate(textInstance, oldText, newText) {
    // Noop
  }

  function commitMount(instance, type, newProps) {
    // Noop
  }

  var ReactPixiFiber = reactReconciler({
    appendInitialChild: appendChild,
    createInstance: createInstance,
    createTextInstance: createTextInstance,
    finalizeInitialChildren: finalizeInitialChildren,
    getChildHostContext: getChildHostContext,
    getRootHostContext: getRootHostContext,
    getPublicInstance: getPublicInstance,
    now: performanceNow$1,
    prepareForCommit: prepareForCommit,
    prepareUpdate: prepareUpdate,
    resetAfterCommit: resetAfterCommit,
    resetTextContent: resetTextContent,
    shouldDeprioritizeSubtree: shouldDeprioritizeSubtree,
    shouldSetTextContent: shouldSetTextContent,
    mutation: {
      appendChild: appendChild,
      appendChildToContainer: appendChild,
      commitMount: commitMount,
      commitTextUpdate: commitTextUpdate,
      commitUpdate: commitUpdate,
      insertBefore: insertBefore,
      insertInContainerBefore: insertBefore,
      removeChild: removeChild,
      removeChildFromContainer: removeChild
    }
  });

  function validateCanvas(props, propName, componentName) {
    // Let's assume that element is canvas if the element is Element and implements getContext
    var element = props[propName];
    if (typeof element === "undefined") {
      return;
    }

    var isCanvas = element instanceof Element && typeof element.getContext === "function";
    if (!isCanvas) {
      var propType = typeof element === "undefined" ? "undefined" : _typeof(element);
      return new Error("Invalid prop '" + propName + "' of type '" + propType + "' supplied to '" + componentName + "', expected '<canvas> Element'.");
    }
  }

  var propTypes = {
    options: PropTypes.shape({
      antialias: PropTypes.bool,
      autoStart: PropTypes.bool,
      backgroundColor: PropTypes.number,
      clearBeforeRender: PropTypes.bool,
      forceCanvas: PropTypes.bool,
      forceFXAA: PropTypes.bool,
      height: PropTypes.number,
      legacy: PropTypes.bool,
      powerPreference: PropTypes.string,
      preserveDrawingBuffer: PropTypes.bool,
      resolution: PropTypes.number,
      roundPixels: PropTypes.bool,
      sharedLoader: PropTypes.bool,
      sharedTicker: PropTypes.bool,
      transparent: PropTypes.bool,
      view: validateCanvas,
      width: PropTypes.number
    }),
    children: PropTypes.node,
    height: PropTypes.number,
    width: PropTypes.number
  };
  var childContextTypes = {
    app: PropTypes.object
  };

  var includingDisplayObjectProps = including(Object.keys(DEFAULT_PROPS));
  var includingStageProps = including(Object.keys(propTypes));
  var includingCanvasProps = function includingCanvasProps(key) {
    return !includingDisplayObjectProps(key) && !includingStageProps(key);
  };

  var getCanvasProps = function getCanvasProps(props) {
    return filterByKey(props, includingCanvasProps);
  };
  var getDisplayObjectProps = function getDisplayObjectProps(props) {
    return filterByKey(props, includingDisplayObjectProps);
  };

  var Stage = function (_React$Component) {
    inherits(Stage, _React$Component);

    function Stage() {
      classCallCheck(this, Stage);
      return possibleConstructorReturn(this, (Stage.__proto__ || Object.getPrototypeOf(Stage)).apply(this, arguments));
    }

    createClass(Stage, [{
      key: "getChildContext",
      value: function getChildContext() {
        return {
          app: this._app
        };
      }
    }, {
      key: "componentDidMount",
      value: function componentDidMount() {
        var _props = this.props,
            children = _props.children,
            height = _props.height,
            options = _props.options,
            width = _props.width;


        this._app = new PIXI.Application(width, height, _extends({
          view: this._canvas
        }, options));

        // Apply root Container props
        var stageProps = getDisplayObjectProps(this.props);
        applyProps(this._app.stage, {}, stageProps);

        // Perhaps this should use the standalone render method somehow, the only differences now are:
        // - parentContainer
        // - callback
        // - return value
        this._mountNode = ReactPixiFiber.createContainer(this._app.stage);
        ReactPixiFiber.updateContainer(children, this._mountNode, this);

        ReactPixiFiber.injectIntoDevTools({
          findFiberByHostInstance: ReactPixiFiber.findFiberByHostInstance,
          bundleType: 1,
          version: pkg.version,
          rendererPackageName: pkg.name
        });
      }
    }, {
      key: "componentDidUpdate",
      value: function componentDidUpdate(prevProps, prevState) {
        var _props2 = this.props,
            children = _props2.children,
            height = _props2.height,
            width = _props2.width;

        // Apply root Container props

        var stageProps = getDisplayObjectProps(this.props);
        applyProps(this._app.stage, {}, stageProps);

        // Root container has been resized - resize renderer
        if (height !== prevProps.height || width !== prevProps.width) {
          this._app.renderer.resize(width, height);
        }

        ReactPixiFiber.updateContainer(children, this._mountNode, this);
      }
    }, {
      key: "componentWillUnmount",
      value: function componentWillUnmount() {
        ReactPixiFiber.updateContainer(null, this._mountNode, this);
      }
    }, {
      key: "render",
      value: function render() {
        var _this2 = this;

        var options = this.props.options;

        var canvasProps = getCanvasProps(this.props);

        // Do not render anything if view is passed to options
        if (typeof options !== "undefined" && options.view) {
          return null;
        } else {
          return React.createElement("canvas", _extends({ ref: function ref(_ref) {
              return _this2._canvas = _ref;
            } }, canvasProps));
        }
      }
    }]);
    return Stage;
  }(React.Component);

  Stage.propTypes = propTypes;
  Stage.childContextTypes = childContextTypes;

  var roots = new Map();

  /*
  * element should be any instance of PIXI DisplayObject
  * containerTag should be an instance of PIXI root Container (i.e. the Stage)
  */
  function render(element, containerTag, callback) {
    var root = roots.get(containerTag);
    if (!root) {
      root = ReactPixiFiber.createContainer(containerTag);
      roots.set(containerTag, root);
    }

    ReactPixiFiber.updateContainer(element, root, undefined, callback);

    ReactPixiFiber.injectIntoDevTools({
      findFiberByHostInstance: ReactPixiFiber.findFiberByHostInstance,
      bundleType: 1,
      version: pkg.version,
      rendererPackageName: pkg.name
    });

    return ReactPixiFiber.getPublicRootInstance(root);
  }

  var BitmapText = TYPES.BITMAP_TEXT;
  var Container = TYPES.CONTAINER;
  var Graphics = TYPES.GRAPHICS;
  var ParticleContainer = TYPES.PARTICLE_CONTAINER;
  var Sprite = TYPES.SPRITE;
  var Text = TYPES.TEXT;
  var TilingSprite = TYPES.TILING_SPRITE;

  exports.CustomPIXIComponent = CustomPIXIComponent;
  exports.Stage = Stage;
  exports.render = render;
  exports.BitmapText = BitmapText;
  exports.Container = Container;
  exports.Graphics = Graphics;
  exports.ParticleContainer = ParticleContainer;
  exports.Sprite = Sprite;
  exports.Text = Text;
  exports.TilingSprite = TilingSprite;
}

window.PixiFibre = {}

module(window.PixiFibre)