rmwc/react-versions/react-15.6.x/node_modules/react/dist/react.js

A thin React wrapper for Material Design (Web) Components

 /**
  * React v15.6.2
  */
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.React = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
/**
 * 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 strict';

/**
 * Escape and wrap key so it is safe to use as a reactid
 *
 * @param {string} key to be escaped.
 * @return {string} the escaped key.
 */

function escape(key) {
  var escapeRegex = /[=:]/g;
  var escaperLookup = {
    '=': '=0',
    ':': '=2'
  };
  var escapedString = ('' + key).replace(escapeRegex, function (match) {
    return escaperLookup[match];
  });

  return '$' + escapedString;
}

/**
 * Unescape and unwrap key for human-readable display
 *
 * @param {string} key to unescape.
 * @return {string} the unescaped key.
 */
function unescape(key) {
  var unescapeRegex = /(=0|=2)/g;
  var unescaperLookup = {
    '=0': '=',
    '=2': ':'
  };
  var keySubstring = key[0] === '.' && key[1] === '$' ? key.substring(2) : key.substring(1);

  return ('' + keySubstring).replace(unescapeRegex, function (match) {
    return unescaperLookup[match];
  });
}

var KeyEscapeUtils = {
  escape: escape,
  unescape: unescape
};

module.exports = KeyEscapeUtils;
},{}],2:[function(_dereq_,module,exports){
/**
 * 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 strict';

var _prodInvariant = _dereq_(25);

var invariant = _dereq_(30);

/**
 * Static poolers. Several custom versions for each potential number of
 * arguments. A completely generic pooler is easy to implement, but would
 * require accessing the `arguments` object. In each of these, `this` refers to
 * the Class itself, not an instance. If any others are needed, simply add them
 * here, or in their own files.
 */
var oneArgumentPooler = function (copyFieldsFrom) {
  var Klass = this;
  if (Klass.instancePool.length) {
    var instance = Klass.instancePool.pop();
    Klass.call(instance, copyFieldsFrom);
    return instance;
  } else {
    return new Klass(copyFieldsFrom);
  }
};

var twoArgumentPooler = function (a1, a2) {
  var Klass = this;
  if (Klass.instancePool.length) {
    var instance = Klass.instancePool.pop();
    Klass.call(instance, a1, a2);
    return instance;
  } else {
    return new Klass(a1, a2);
  }
};

var threeArgumentPooler = function (a1, a2, a3) {
  var Klass = this;
  if (Klass.instancePool.length) {
    var instance = Klass.instancePool.pop();
    Klass.call(instance, a1, a2, a3);
    return instance;
  } else {
    return new Klass(a1, a2, a3);
  }
};

var fourArgumentPooler = function (a1, a2, a3, a4) {
  var Klass = this;
  if (Klass.instancePool.length) {
    var instance = Klass.instancePool.pop();
    Klass.call(instance, a1, a2, a3, a4);
    return instance;
  } else {
    return new Klass(a1, a2, a3, a4);
  }
};

var standardReleaser = function (instance) {
  var Klass = this;
  !(instance instanceof Klass) ? "development" !== 'production' ? invariant(false, 'Trying to release an instance into a pool of a different type.') : _prodInvariant('25') : void 0;
  instance.destructor();
  if (Klass.instancePool.length < Klass.poolSize) {
    Klass.instancePool.push(instance);
  }
};

var DEFAULT_POOL_SIZE = 10;
var DEFAULT_POOLER = oneArgumentPooler;

/**
 * Augments `CopyConstructor` to be a poolable class, augmenting only the class
 * itself (statically) not adding any prototypical fields. Any CopyConstructor
 * you give this may have a `poolSize` property, and will look for a
 * prototypical `destructor` on instances.
 *
 * @param {Function} CopyConstructor Constructor that can be used to reset.
 * @param {Function} pooler Customizable pooler.
 */
var addPoolingTo = function (CopyConstructor, pooler) {
  // Casting as any so that flow ignores the actual implementation and trusts
  // it to match the type we declared
  var NewKlass = CopyConstructor;
  NewKlass.instancePool = [];
  NewKlass.getPooled = pooler || DEFAULT_POOLER;
  if (!NewKlass.poolSize) {
    NewKlass.poolSize = DEFAULT_POOL_SIZE;
  }
  NewKlass.release = standardReleaser;
  return NewKlass;
};

var PooledClass = {
  addPoolingTo: addPoolingTo,
  oneArgumentPooler: oneArgumentPooler,
  twoArgumentPooler: twoArgumentPooler,
  threeArgumentPooler: threeArgumentPooler,
  fourArgumentPooler: fourArgumentPooler
};

module.exports = PooledClass;
},{"25":25,"30":30}],3:[function(_dereq_,module,exports){
/**
 * 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 strict';

var _assign = _dereq_(32);

var ReactBaseClasses = _dereq_(4);
var ReactChildren = _dereq_(5);
var ReactDOMFactories = _dereq_(8);
var ReactElement = _dereq_(9);
var ReactPropTypes = _dereq_(14);
var ReactVersion = _dereq_(17);

var createReactClass = _dereq_(20);
var onlyChild = _dereq_(24);

var createElement = ReactElement.createElement;
var createFactory = ReactElement.createFactory;
var cloneElement = ReactElement.cloneElement;

if ("development" !== 'production') {
  var lowPriorityWarning = _dereq_(23);
  var canDefineProperty = _dereq_(18);
  var ReactElementValidator = _dereq_(11);
  var didWarnPropTypesDeprecated = false;
  createElement = ReactElementValidator.createElement;
  createFactory = ReactElementValidator.createFactory;
  cloneElement = ReactElementValidator.cloneElement;
}

var __spread = _assign;
var createMixin = function (mixin) {
  return mixin;
};

if ("development" !== 'production') {
  var warnedForSpread = false;
  var warnedForCreateMixin = false;
  __spread = function () {
    lowPriorityWarning(warnedForSpread, 'React.__spread is deprecated and should not be used. Use ' + 'Object.assign directly or another helper function with similar ' + 'semantics. You may be seeing this warning due to your compiler. ' + 'See https://fb.me/react-spread-deprecation for more details.');
    warnedForSpread = true;
    return _assign.apply(null, arguments);
  };

  createMixin = function (mixin) {
    lowPriorityWarning(warnedForCreateMixin, 'React.createMixin is deprecated and should not be used. ' + 'In React v16.0, it will be removed. ' + 'You can use this mixin directly instead. ' + 'See https://fb.me/createmixin-was-never-implemented for more info.');
    warnedForCreateMixin = true;
    return mixin;
  };
}

var React = {
  // Modern

  Children: {
    map: ReactChildren.map,
    forEach: ReactChildren.forEach,
    count: ReactChildren.count,
    toArray: ReactChildren.toArray,
    only: onlyChild
  },

  Component: ReactBaseClasses.Component,
  PureComponent: ReactBaseClasses.PureComponent,

  createElement: createElement,
  cloneElement: cloneElement,
  isValidElement: ReactElement.isValidElement,

  // Classic

  PropTypes: ReactPropTypes,
  createClass: createReactClass,
  createFactory: createFactory,
  createMixin: createMixin,

  // This looks DOM specific but these are actually isomorphic helpers
  // since they are just generating DOM strings.
  DOM: ReactDOMFactories,

  version: ReactVersion,

  // Deprecated hook for JSX spread, don't use this for anything.
  __spread: __spread
};

if ("development" !== 'production') {
  var warnedForCreateClass = false;
  if (canDefineProperty) {
    Object.defineProperty(React, 'PropTypes', {
      get: function () {
        lowPriorityWarning(didWarnPropTypesDeprecated, 'Accessing PropTypes via the main React package is deprecated,' + ' and will be removed in  React v16.0.' + ' Use the latest available v15.* prop-types package from npm instead.' + ' For info on usage, compatibility, migration and more, see ' + 'https://fb.me/prop-types-docs');
        didWarnPropTypesDeprecated = true;
        return ReactPropTypes;
      }
    });

    Object.defineProperty(React, 'createClass', {
      get: function () {
        lowPriorityWarning(warnedForCreateClass, 'Accessing createClass via the main React package is deprecated,' + ' and will be removed in React v16.0.' + " Use a plain JavaScript class instead. If you're not yet " + 'ready to migrate, create-react-class v15.* is available ' + 'on npm as a temporary, drop-in replacement. ' + 'For more info see https://fb.me/react-create-class');
        warnedForCreateClass = true;
        return createReactClass;
      }
    });
  }

  // React.DOM factories are deprecated. Wrap these methods so that
  // invocations of the React.DOM namespace and alert users to switch
  // to the `react-dom-factories` package.
  React.DOM = {};
  var warnedForFactories = false;
  Object.keys(ReactDOMFactories).forEach(function (factory) {
    React.DOM[factory] = function () {
      if (!warnedForFactories) {
        lowPriorityWarning(false, 'Accessing factories like React.DOM.%s has been deprecated ' + 'and will be removed in v16.0+. Use the ' + 'react-dom-factories package instead. ' + ' Version 1.0 provides a drop-in replacement.' + ' For more info, see https://fb.me/react-dom-factories', factory);
        warnedForFactories = true;
      }
      return ReactDOMFactories[factory].apply(ReactDOMFactories, arguments);
    };
  });
}

module.exports = React;
},{"11":11,"14":14,"17":17,"18":18,"20":20,"23":23,"24":24,"32":32,"4":4,"5":5,"8":8,"9":9}],4:[function(_dereq_,module,exports){
/**
 * 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 strict';

var _prodInvariant = _dereq_(25),
    _assign = _dereq_(32);

var ReactNoopUpdateQueue = _dereq_(12);

var canDefineProperty = _dereq_(18);
var emptyObject = _dereq_(29);
var invariant = _dereq_(30);
var lowPriorityWarning = _dereq_(23);

/**
 * Base class helpers for the updating state of a component.
 */
function ReactComponent(props, context, updater) {
  this.props = props;
  this.context = context;
  this.refs = emptyObject;
  // We initialize the default updater but the real one gets injected by the
  // renderer.
  this.updater = updater || ReactNoopUpdateQueue;
}

ReactComponent.prototype.isReactComponent = {};

/**
 * Sets a subset of the state. Always use this to mutate
 * state. You should treat `this.state` as immutable.
 *
 * There is no guarantee that `this.state` will be immediately updated, so
 * accessing `this.state` after calling this method may return the old value.
 *
 * There is no guarantee that calls to `setState` will run synchronously,
 * as they may eventually be batched together.  You can provide an optional
 * callback that will be executed when the call to setState is actually
 * completed.
 *
 * When a function is provided to setState, it will be called at some point in
 * the future (not synchronously). It will be called with the up to date
 * component arguments (state, props, context). These values can be different
 * from this.* because your function may be called after receiveProps but before
 * shouldComponentUpdate, and this new state, props, and context will not yet be
 * assigned to this.
 *
 * @param {object|function} partialState Next partial state or function to
 *        produce next partial state to be merged with current state.
 * @param {?function} callback Called after state is updated.
 * @final
 * @protected
 */
ReactComponent.prototype.setState = function (partialState, callback) {
  !(typeof partialState === 'object' || typeof partialState === 'function' || partialState == null) ? "development" !== 'production' ? invariant(false, 'setState(...): takes an object of state variables to update or a function which returns an object of state variables.') : _prodInvariant('85') : void 0;
  this.updater.enqueueSetState(this, partialState);
  if (callback) {
    this.updater.enqueueCallback(this, callback, 'setState');
  }
};

/**
 * Forces an update. This should only be invoked when it is known with
 * certainty that we are **not** in a DOM transaction.
 *
 * You may want to call this when you know that some deeper aspect of the
 * component's state has changed but `setState` was not called.
 *
 * This will not invoke `shouldComponentUpdate`, but it will invoke
 * `componentWillUpdate` and `componentDidUpdate`.
 *
 * @param {?function} callback Called after update is complete.
 * @final
 * @protected
 */
ReactComponent.prototype.forceUpdate = function (callback) {
  this.updater.enqueueForceUpdate(this);
  if (callback) {
    this.updater.enqueueCallback(this, callback, 'forceUpdate');
  }
};

/**
 * Deprecated APIs. These APIs used to exist on classic React classes but since
 * we would like to deprecate them, we're not going to move them over to this
 * modern base class. Instead, we define a getter that warns if it's accessed.
 */
if ("development" !== 'production') {
  var deprecatedAPIs = {
    isMounted: ['isMounted', 'Instead, make sure to clean up subscriptions and pending requests in ' + 'componentWillUnmount to prevent memory leaks.'],
    replaceState: ['replaceState', 'Refactor your code to use setState instead (see ' + 'https://github.com/facebook/react/issues/3236).']
  };
  var defineDeprecationWarning = function (methodName, info) {
    if (canDefineProperty) {
      Object.defineProperty(ReactComponent.prototype, methodName, {
        get: function () {
          lowPriorityWarning(false, '%s(...) is deprecated in plain JavaScript React classes. %s', info[0], info[1]);
          return undefined;
        }
      });
    }
  };
  for (var fnName in deprecatedAPIs) {
    if (deprecatedAPIs.hasOwnProperty(fnName)) {
      defineDeprecationWarning(fnName, deprecatedAPIs[fnName]);
    }
  }
}

/**
 * Base class helpers for the updating state of a component.
 */
function ReactPureComponent(props, context, updater) {
  // Duplicated from ReactComponent.
  this.props = props;
  this.context = context;
  this.refs = emptyObject;
  // We initialize the default updater but the real one gets injected by the
  // renderer.
  this.updater = updater || ReactNoopUpdateQueue;
}

function ComponentDummy() {}
ComponentDummy.prototype = ReactComponent.prototype;
ReactPureComponent.prototype = new ComponentDummy();
ReactPureComponent.prototype.constructor = ReactPureComponent;
// Avoid an extra prototype jump for these methods.
_assign(ReactPureComponent.prototype, ReactComponent.prototype);
ReactPureComponent.prototype.isPureReactComponent = true;

module.exports = {
  Component: ReactComponent,
  PureComponent: ReactPureComponent
};
},{"12":12,"18":18,"23":23,"25":25,"29":29,"30":30,"32":32}],5:[function(_dereq_,module,exports){
/**
 * 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 strict';

var PooledClass = _dereq_(2);
var ReactElement = _dereq_(9);

var emptyFunction = _dereq_(28);
var traverseAllChildren = _dereq_(26);

var twoArgumentPooler = PooledClass.twoArgumentPooler;
var fourArgumentPooler = PooledClass.fourArgumentPooler;

var userProvidedKeyEscapeRegex = /\/+/g;
function escapeUserProvidedKey(text) {
  return ('' + text).replace(userProvidedKeyEscapeRegex, '$&/');
}

/**
 * PooledClass representing the bookkeeping associated with performing a child
 * traversal. Allows avoiding binding callbacks.
 *
 * @constructor ForEachBookKeeping
 * @param {!function} forEachFunction Function to perform traversal with.
 * @param {?*} forEachContext Context to perform context with.
 */
function ForEachBookKeeping(forEachFunction, forEachContext) {
  this.func = forEachFunction;
  this.context = forEachContext;
  this.count = 0;
}
ForEachBookKeeping.prototype.destructor = function () {
  this.func = null;
  this.context = null;
  this.count = 0;
};
PooledClass.addPoolingTo(ForEachBookKeeping, twoArgumentPooler);

function forEachSingleChild(bookKeeping, child, name) {
  var func = bookKeeping.func,
      context = bookKeeping.context;

  func.call(context, child, bookKeeping.count++);
}

/**
 * Iterates through children that are typically specified as `props.children`.
 *
 * See https://facebook.github.io/react/docs/top-level-api.html#react.children.foreach
 *
 * The provided forEachFunc(child, index) will be called for each
 * leaf child.
 *
 * @param {?*} children Children tree container.
 * @param {function(*, int)} forEachFunc
 * @param {*} forEachContext Context for forEachContext.
 */
function forEachChildren(children, forEachFunc, forEachContext) {
  if (children == null) {
    return children;
  }
  var traverseContext = ForEachBookKeeping.getPooled(forEachFunc, forEachContext);
  traverseAllChildren(children, forEachSingleChild, traverseContext);
  ForEachBookKeeping.release(traverseContext);
}

/**
 * PooledClass representing the bookkeeping associated with performing a child
 * mapping. Allows avoiding binding callbacks.
 *
 * @constructor MapBookKeeping
 * @param {!*} mapResult Object containing the ordered map of results.
 * @param {!function} mapFunction Function to perform mapping with.
 * @param {?*} mapContext Context to perform mapping with.
 */
function MapBookKeeping(mapResult, keyPrefix, mapFunction, mapContext) {
  this.result = mapResult;
  this.keyPrefix = keyPrefix;
  this.func = mapFunction;
  this.context = mapContext;
  this.count = 0;
}
MapBookKeeping.prototype.destructor = function () {
  this.result = null;
  this.keyPrefix = null;
  this.func = null;
  this.context = null;
  this.count = 0;
};
PooledClass.addPoolingTo(MapBookKeeping, fourArgumentPooler);

function mapSingleChildIntoContext(bookKeeping, child, childKey) {
  var result = bookKeeping.result,
      keyPrefix = bookKeeping.keyPrefix,
      func = bookKeeping.func,
      context = bookKeeping.context;


  var mappedChild = func.call(context, child, bookKeeping.count++);
  if (Array.isArray(mappedChild)) {
    mapIntoWithKeyPrefixInternal(mappedChild, result, childKey, emptyFunction.thatReturnsArgument);
  } else if (mappedChild != null) {
    if (ReactElement.isValidElement(mappedChild)) {
      mappedChild = ReactElement.cloneAndReplaceKey(mappedChild,
      // Keep both the (mapped) and old keys if they differ, just as
      // traverseAllChildren used to do for objects as children
      keyPrefix + (mappedChild.key && (!child || child.key !== mappedChild.key) ? escapeUserProvidedKey(mappedChild.key) + '/' : '') + childKey);
    }
    result.push(mappedChild);
  }
}

function mapIntoWithKeyPrefixInternal(children, array, prefix, func, context) {
  var escapedPrefix = '';
  if (prefix != null) {
    escapedPrefix = escapeUserProvidedKey(prefix) + '/';
  }
  var traverseContext = MapBookKeeping.getPooled(array, escapedPrefix, func, context);
  traverseAllChildren(children, mapSingleChildIntoContext, traverseContext);
  MapBookKeeping.release(traverseContext);
}

/**
 * Maps children that are typically specified as `props.children`.
 *
 * See https://facebook.github.io/react/docs/top-level-api.html#react.children.map
 *
 * The provided mapFunction(child, key, index) will be called for each
 * leaf child.
 *
 * @param {?*} children Children tree container.
 * @param {function(*, int)} func The map function.
 * @param {*} context Context for mapFunction.
 * @return {object} Object containing the ordered map of results.
 */
function mapChildren(children, func, context) {
  if (children == null) {
    return children;
  }
  var result = [];
  mapIntoWithKeyPrefixInternal(children, result, null, func, context);
  return result;
}

function forEachSingleChildDummy(traverseContext, child, name) {
  return null;
}

/**
 * Count the number of children that are typically specified as
 * `props.children`.
 *
 * See https://facebook.github.io/react/docs/top-level-api.html#react.children.count
 *
 * @param {?*} children Children tree container.
 * @return {number} The number of children.
 */
function countChildren(children, context) {
  return traverseAllChildren(children, forEachSingleChildDummy, null);
}

/**
 * Flatten a children object (typically specified as `props.children`) and
 * return an array with appropriately re-keyed children.
 *
 * See https://facebook.github.io/react/docs/top-level-api.html#react.children.toarray
 */
function toArray(children) {
  var result = [];
  mapIntoWithKeyPrefixInternal(children, result, null, emptyFunction.thatReturnsArgument);
  return result;
}

var ReactChildren = {
  forEach: forEachChildren,
  map: mapChildren,
  mapIntoWithKeyPrefixInternal: mapIntoWithKeyPrefixInternal,
  count: countChildren,
  toArray: toArray
};

module.exports = ReactChildren;
},{"2":2,"26":26,"28":28,"9":9}],6:[function(_dereq_,module,exports){
/**
 * Copyright (c) 2016-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 strict';

var _prodInvariant = _dereq_(25);

var ReactCurrentOwner = _dereq_(7);

var invariant = _dereq_(30);
var warning = _dereq_(31);

function isNative(fn) {
  // Based on isNative() from Lodash
  var funcToString = Function.prototype.toString;
  var hasOwnProperty = Object.prototype.hasOwnProperty;
  var reIsNative = RegExp('^' + funcToString
  // Take an example native function source for comparison
  .call(hasOwnProperty
  // Strip regex characters so we can use it for regex
  ).replace(/[\\^$.*+?()[\]{}|]/g, '\\$&'
  // Remove hasOwnProperty from the template to make it generic
  ).replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$');
  try {
    var source = funcToString.call(fn);
    return reIsNative.test(source);
  } catch (err) {
    return false;
  }
}

var canUseCollections =
// Array.from
typeof Array.from === 'function' &&
// Map
typeof Map === 'function' && isNative(Map) &&
// Map.prototype.keys
Map.prototype != null && typeof Map.prototype.keys === 'function' && isNative(Map.prototype.keys) &&
// Set
typeof Set === 'function' && isNative(Set) &&
// Set.prototype.keys
Set.prototype != null && typeof Set.prototype.keys === 'function' && isNative(Set.prototype.keys);

var setItem;
var getItem;
var removeItem;
var getItemIDs;
var addRoot;
var removeRoot;
var getRootIDs;

if (canUseCollections) {
  var itemMap = new Map();
  var rootIDSet = new Set();

  setItem = function (id, item) {
    itemMap.set(id, item);
  };
  getItem = function (id) {
    return itemMap.get(id);
  };
  removeItem = function (id) {
    itemMap['delete'](id);
  };
  getItemIDs = function () {
    return Array.from(itemMap.keys());
  };

  addRoot = function (id) {
    rootIDSet.add(id);
  };
  removeRoot = function (id) {
    rootIDSet['delete'](id);
  };
  getRootIDs = function () {
    return Array.from(rootIDSet.keys());
  };
} else {
  var itemByKey = {};
  var rootByKey = {};

  // Use non-numeric keys to prevent V8 performance issues:
  // https://github.com/facebook/react/pull/7232
  var getKeyFromID = function (id) {
    return '.' + id;
  };
  var getIDFromKey = function (key) {
    return parseInt(key.substr(1), 10);
  };

  setItem = function (id, item) {
    var key = getKeyFromID(id);
    itemByKey[key] = item;
  };
  getItem = function (id) {
    var key = getKeyFromID(id);
    return itemByKey[key];
  };
  removeItem = function (id) {
    var key = getKeyFromID(id);
    delete itemByKey[key];
  };
  getItemIDs = function () {
    return Object.keys(itemByKey).map(getIDFromKey);
  };

  addRoot = function (id) {
    var key = getKeyFromID(id);
    rootByKey[key] = true;
  };
  removeRoot = function (id) {
    var key = getKeyFromID(id);
    delete rootByKey[key];
  };
  getRootIDs = function () {
    return Object.keys(rootByKey).map(getIDFromKey);
  };
}

var unmountedIDs = [];

function purgeDeep(id) {
  var item = getItem(id);
  if (item) {
    var childIDs = item.childIDs;

    removeItem(id);
    childIDs.forEach(purgeDeep);
  }
}

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

function getDisplayName(element) {
  if (element == null) {
    return '#empty';
  } else if (typeof element === 'string' || typeof element === 'number') {
    return '#text';
  } else if (typeof element.type === 'string') {
    return element.type;
  } else {
    return element.type.displayName || element.type.name || 'Unknown';
  }
}

function describeID(id) {
  var name = ReactComponentTreeHook.getDisplayName(id);
  var element = ReactComponentTreeHook.getElement(id);
  var ownerID = ReactComponentTreeHook.getOwnerID(id);
  var ownerName;
  if (ownerID) {
    ownerName = ReactComponentTreeHook.getDisplayName(ownerID);
  }
  "development" !== 'production' ? warning(element, 'ReactComponentTreeHook: Missing React element for debugID %s when ' + 'building stack', id) : void 0;
  return describeComponentFrame(name, element && element._source, ownerName);
}

var ReactComponentTreeHook = {
  onSetChildren: function (id, nextChildIDs) {
    var item = getItem(id);
    !item ? "development" !== 'production' ? invariant(false, 'Item must have been set') : _prodInvariant('144') : void 0;
    item.childIDs = nextChildIDs;

    for (var i = 0; i < nextChildIDs.length; i++) {
      var nextChildID = nextChildIDs[i];
      var nextChild = getItem(nextChildID);
      !nextChild ? "development" !== 'production' ? invariant(false, 'Expected hook events to fire for the child before its parent includes it in onSetChildren().') : _prodInvariant('140') : void 0;
      !(nextChild.childIDs != null || typeof nextChild.element !== 'object' || nextChild.element == null) ? "development" !== 'production' ? invariant(false, 'Expected onSetChildren() to fire for a container child before its parent includes it in onSetChildren().') : _prodInvariant('141') : void 0;
      !nextChild.isMounted ? "development" !== 'production' ? invariant(false, 'Expected onMountComponent() to fire for the child before its parent includes it in onSetChildren().') : _prodInvariant('71') : void 0;
      if (nextChild.parentID == null) {
        nextChild.parentID = id;
        // TODO: This shouldn't be necessary but mounting a new root during in
        // componentWillMount currently causes not-yet-mounted components to
        // be purged from our tree data so their parent id is missing.
      }
      !(nextChild.parentID === id) ? "development" !== 'production' ? invariant(false, 'Expected onBeforeMountComponent() parent and onSetChildren() to be consistent (%s has parents %s and %s).', nextChildID, nextChild.parentID, id) : _prodInvariant('142', nextChildID, nextChild.parentID, id) : void 0;
    }
  },
  onBeforeMountComponent: function (id, element, parentID) {
    var item = {
      element: element,
      parentID: parentID,
      text: null,
      childIDs: [],
      isMounted: false,
      updateCount: 0
    };
    setItem(id, item);
  },
  onBeforeUpdateComponent: function (id, element) {
    var item = getItem(id);
    if (!item || !item.isMounted) {
      // We may end up here as a result of setState() in componentWillUnmount().
      // In this case, ignore the element.
      return;
    }
    item.element = element;
  },
  onMountComponent: function (id) {
    var item = getItem(id);
    !item ? "development" !== 'production' ? invariant(false, 'Item must have been set') : _prodInvariant('144') : void 0;
    item.isMounted = true;
    var isRoot = item.parentID === 0;
    if (isRoot) {
      addRoot(id);
    }
  },
  onUpdateComponent: function (id) {
    var item = getItem(id);
    if (!item || !item.isMounted) {
      // We may end up here as a result of setState() in componentWillUnmount().
      // In this case, ignore the element.
      return;
    }
    item.updateCount++;
  },
  onUnmountComponent: function (id) {
    var item = getItem(id);
    if (item) {
      // We need to check if it exists.
      // `item` might not exist if it is inside an error boundary, and a sibling
      // error boundary child threw while mounting. Then this instance never
      // got a chance to mount, but it still gets an unmounting event during
      // the error boundary cleanup.
      item.isMounted = false;
      var isRoot = item.parentID === 0;
      if (isRoot) {
        removeRoot(id);
      }
    }
    unmountedIDs.push(id);
  },
  purgeUnmountedComponents: function () {
    if (ReactComponentTreeHook._preventPurging) {
      // Should only be used for testing.
      return;
    }

    for (var i = 0; i < unmountedIDs.length; i++) {
      var id = unmountedIDs[i];
      purgeDeep(id);
    }
    unmountedIDs.length = 0;
  },
  isMounted: function (id) {
    var item = getItem(id);
    return item ? item.isMounted : false;
  },
  getCurrentStackAddendum: function (topElement) {
    var info = '';
    if (topElement) {
      var name = getDisplayName(topElement);
      var owner = topElement._owner;
      info += describeComponentFrame(name, topElement._source, owner && owner.getName());
    }

    var currentOwner = ReactCurrentOwner.current;
    var id = currentOwner && currentOwner._debugID;

    info += ReactComponentTreeHook.getStackAddendumByID(id);
    return info;
  },
  getStackAddendumByID: function (id) {
    var info = '';
    while (id) {
      info += describeID(id);
      id = ReactComponentTreeHook.getParentID(id);
    }
    return info;
  },
  getChildIDs: function (id) {
    var item = getItem(id);
    return item ? item.childIDs : [];
  },
  getDisplayName: function (id) {
    var element = ReactComponentTreeHook.getElement(id);
    if (!element) {
      return null;
    }
    return getDisplayName(element);
  },
  getElement: function (id) {
    var item = getItem(id);
    return item ? item.element : null;
  },
  getOwnerID: function (id) {
    var element = ReactComponentTreeHook.getElement(id);
    if (!element || !element._owner) {
      return null;
    }
    return element._owner._debugID;
  },
  getParentID: function (id) {
    var item = getItem(id);
    return item ? item.parentID : null;
  },
  getSource: function (id) {
    var item = getItem(id);
    var element = item ? item.element : null;
    var source = element != null ? element._source : null;
    return source;
  },
  getText: function (id) {
    var element = ReactComponentTreeHook.getElement(id);
    if (typeof element === 'string') {
      return element;
    } else if (typeof element === 'number') {
      return '' + element;
    } else {
      return null;
    }
  },
  getUpdateCount: function (id) {
    var item = getItem(id);
    return item ? item.updateCount : 0;
  },


  getRootIDs: getRootIDs,
  getRegisteredIDs: getItemIDs,

  pushNonStandardWarningStack: function (isCreatingElement, currentSource) {
    if (typeof console.reactStack !== 'function') {
      return;
    }

    var stack = [];
    var currentOwner = ReactCurrentOwner.current;
    var id = currentOwner && currentOwner._debugID;

    try {
      if (isCreatingElement) {
        stack.push({
          name: id ? ReactComponentTreeHook.getDisplayName(id) : null,
          fileName: currentSource ? currentSource.fileName : null,
          lineNumber: currentSource ? currentSource.lineNumber : null
        });
      }

      while (id) {
        var element = ReactComponentTreeHook.getElement(id);
        var parentID = ReactComponentTreeHook.getParentID(id);
        var ownerID = ReactComponentTreeHook.getOwnerID(id);
        var ownerName = ownerID ? ReactComponentTreeHook.getDisplayName(ownerID) : null;
        var source = element && element._source;
        stack.push({
          name: ownerName,
          fileName: source ? source.fileName : null,
          lineNumber: source ? source.lineNumber : null
        });
        id = parentID;
      }
    } catch (err) {
      // Internal state is messed up.
      // Stop building the stack (it's just a nice to have).
    }

    console.reactStack(stack);
  },
  popNonStandardWarningStack: function () {
    if (typeof console.reactStackEnd !== 'function') {
      return;
    }
    console.reactStackEnd();
  }
};

module.exports = ReactComponentTreeHook;
},{"25":25,"30":30,"31":31,"7":7}],7:[function(_dereq_,module,exports){
/**
 * 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 strict';

/**
 * Keeps track of the current owner.
 *
 * The current owner is the component who should own any components that are
 * currently being constructed.
 */
var ReactCurrentOwner = {
  /**
   * @internal
   * @type {ReactComponent}
   */
  current: null
};

module.exports = ReactCurrentOwner;
},{}],8:[function(_dereq_,module,exports){
/**
 * 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 strict';

var ReactElement = _dereq_(9);

/**
 * Create a factory that creates HTML tag elements.
 *
 * @private
 */
var createDOMFactory = ReactElement.createFactory;
if ("development" !== 'production') {
  var ReactElementValidator = _dereq_(11);
  createDOMFactory = ReactElementValidator.createFactory;
}

/**
 * Creates a mapping from supported HTML tags to `ReactDOMComponent` classes.
 *
 * @public
 */
var ReactDOMFactories = {
  a: createDOMFactory('a'),
  abbr: createDOMFactory('abbr'),
  address: createDOMFactory('address'),
  area: createDOMFactory('area'),
  article: createDOMFactory('article'),
  aside: createDOMFactory('aside'),
  audio: createDOMFactory('audio'),
  b: createDOMFactory('b'),
  base: createDOMFactory('base'),
  bdi: createDOMFactory('bdi'),
  bdo: createDOMFactory('bdo'),
  big: createDOMFactory('big'),
  blockquote: createDOMFactory('blockquote'),
  body: createDOMFactory('body'),
  br: createDOMFactory('br'),
  button: createDOMFactory('button'),
  canvas: createDOMFactory('canvas'),
  caption: createDOMFactory('caption'),
  cite: createDOMFactory('cite'),
  code: createDOMFactory('code'),
  col: createDOMFactory('col'),
  colgroup: createDOMFactory('colgroup'),
  data: createDOMFactory('data'),
  datalist: createDOMFactory('datalist'),
  dd: createDOMFactory('dd'),
  del: createDOMFactory('del'),
  details: createDOMFactory('details'),
  dfn: createDOMFactory('dfn'),
  dialog: createDOMFactory('dialog'),
  div: createDOMFactory('div'),
  dl: createDOMFactory('dl'),
  dt: createDOMFactory('dt'),
  em: createDOMFactory('em'),
  embed: createDOMFactory('embed'),
  fieldset: createDOMFactory('fieldset'),
  figcaption: createDOMFactory('figcaption'),
  figure: createDOMFactory('figure'),
  footer: createDOMFactory('footer'),
  form: createDOMFactory('form'),
  h1: createDOMFactory('h1'),
  h2: createDOMFactory('h2'),
  h3: createDOMFactory('h3'),
  h4: createDOMFactory('h4'),
  h5: createDOMFactory('h5'),
  h6: createDOMFactory('h6'),
  head: createDOMFactory('head'),
  header: createDOMFactory('header'),
  hgroup: createDOMFactory('hgroup'),
  hr: createDOMFactory('hr'),
  html: createDOMFactory('html'),
  i: createDOMFactory('i'),
  iframe: createDOMFactory('iframe'),
  img: createDOMFactory('img'),
  input: createDOMFactory('input'),
  ins: createDOMFactory('ins'),
  kbd: createDOMFactory('kbd'),
  keygen: createDOMFactory('keygen'),
  label: createDOMFactory('label'),
  legend: createDOMFactory('legend'),
  li: createDOMFactory('li'),
  link: createDOMFactory('link'),
  main: createDOMFactory('main'),
  map: createDOMFactory('map'),
  mark: createDOMFactory('mark'),
  menu: createDOMFactory('menu'),
  menuitem: createDOMFactory('menuitem'),
  meta: createDOMFactory('meta'),
  meter: createDOMFactory('meter'),
  nav: createDOMFactory('nav'),
  noscript: createDOMFactory('noscript'),
  object: createDOMFactory('object'),
  ol: createDOMFactory('ol'),
  optgroup: createDOMFactory('optgroup'),
  option: createDOMFactory('option'),
  output: createDOMFactory('output'),
  p: createDOMFactory('p'),
  param: createDOMFactory('param'),
  picture: createDOMFactory('picture'),
  pre: createDOMFactory('pre'),
  progress: createDOMFactory('progress'),
  q: createDOMFactory('q'),
  rp: createDOMFactory('rp'),
  rt: createDOMFactory('rt'),
  ruby: createDOMFactory('ruby'),
  s: createDOMFactory('s'),
  samp: createDOMFactory('samp'),
  script: createDOMFactory('script'),
  section: createDOMFactory('section'),
  select: createDOMFactory('select'),
  small: createDOMFactory('small'),
  source: createDOMFactory('source'),
  span: createDOMFactory('span'),
  strong: createDOMFactory('strong'),
  style: createDOMFactory('style'),
  sub: createDOMFactory('sub'),
  summary: createDOMFactory('summary'),
  sup: createDOMFactory('sup'),
  table: createDOMFactory('table'),
  tbody: createDOMFactory('tbody'),
  td: createDOMFactory('td'),
  textarea: createDOMFactory('textarea'),
  tfoot: createDOMFactory('tfoot'),
  th: createDOMFactory('th'),
  thead: createDOMFactory('thead'),
  time: createDOMFactory('time'),
  title: createDOMFactory('title'),
  tr: createDOMFactory('tr'),
  track: createDOMFactory('track'),
  u: createDOMFactory('u'),
  ul: createDOMFactory('ul'),
  'var': createDOMFactory('var'),
  video: createDOMFactory('video'),
  wbr: createDOMFactory('wbr'),

  // SVG
  circle: createDOMFactory('circle'),
  clipPath: createDOMFactory('clipPath'),
  defs: createDOMFactory('defs'),
  ellipse: createDOMFactory('ellipse'),
  g: createDOMFactory('g'),
  image: createDOMFactory('image'),
  line: createDOMFactory('line'),
  linearGradient: createDOMFactory('linearGradient'),
  mask: createDOMFactory('mask'),
  path: createDOMFactory('path'),
  pattern: createDOMFactory('pattern'),
  polygon: createDOMFactory('polygon'),
  polyline: createDOMFactory('polyline'),
  radialGradient: createDOMFactory('radialGradient'),
  rect: createDOMFactory('rect'),
  stop: createDOMFactory('stop'),
  svg: createDOMFactory('svg'),
  text: createDOMFactory('text'),
  tspan: createDOMFactory('tspan')
};

module.exports = ReactDOMFactories;
},{"11":11,"9":9}],9:[function(_dereq_,module,exports){
/**
 * Copyright (c) 2014-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 strict';

var _assign = _dereq_(32);

var ReactCurrentOwner = _dereq_(7);

var warning = _dereq_(31);
var canDefineProperty = _dereq_(18);
var hasOwnProperty = Object.prototype.hasOwnProperty;

var REACT_ELEMENT_TYPE = _dereq_(10);

var RESERVED_PROPS = {
  key: true,
  ref: true,
  __self: true,
  __source: true
};

var specialPropKeyWarningShown, specialPropRefWarningShown;

function hasValidRef(config) {
  if ("development" !== 'production') {
    if (hasOwnProperty.call(config, 'ref')) {
      var getter = Object.getOwnPropertyDescriptor(config, 'ref').get;
      if (getter && getter.isReactWarning) {
        return false;
      }
    }
  }
  return config.ref !== undefined;
}

function hasValidKey(config) {
  if ("development" !== 'production') {
    if (hasOwnProperty.call(config, 'key')) {
      var getter = Object.getOwnPropertyDescriptor(config, 'key').get;
      if (getter && getter.isReactWarning) {
        return false;
      }
    }
  }
  return config.key !== undefined;
}

function defineKeyPropWarningGetter(props, displayName) {
  var warnAboutAccessingKey = function () {
    if (!specialPropKeyWarningShown) {
      specialPropKeyWarningShown = true;
      "development" !== 'production' ? warning(false, '%s: `key` is not a prop. Trying to access it will result ' + 'in `undefined` being returned. If you need to access the same ' + 'value within the child component, you should pass it as a different ' + 'prop. (https://fb.me/react-special-props)', displayName) : void 0;
    }
  };
  warnAboutAccessingKey.isReactWarning = true;
  Object.defineProperty(props, 'key', {
    get: warnAboutAccessingKey,
    configurable: true
  });
}

function defineRefPropWarningGetter(props, displayName) {
  var warnAboutAccessingRef = function () {
    if (!specialPropRefWarningShown) {
      specialPropRefWarningShown = true;
      "development" !== 'production' ? warning(false, '%s: `ref` is not a prop. Trying to access it will result ' + 'in `undefined` being returned. If you need to access the same ' + 'value within the child component, you should pass it as a different ' + 'prop. (https://fb.me/react-special-props)', displayName) : void 0;
    }
  };
  warnAboutAccessingRef.isReactWarning = true;
  Object.defineProperty(props, 'ref', {
    get: warnAboutAccessingRef,
    configurable: true
  });
}

/**
 * Factory method to create a new React element. This no longer adheres to
 * the class pattern, so do not use new to call it. Also, no instanceof check
 * will work. Instead test $$typeof field against Symbol.for('react.element') to check
 * if something is a React Element.
 *
 * @param {*} type
 * @param {*} key
 * @param {string|object} ref
 * @param {*} self A *temporary* helper to detect places where `this` is
 * different from the `owner` when React.createElement is called, so that we
 * can warn. We want to get rid of owner and replace string `ref`s with arrow
 * functions, and as long as `this` and owner are the same, there will be no
 * change in behavior.
 * @param {*} source An annotation object (added by a transpiler or otherwise)
 * indicating filename, line number, and/or other information.
 * @param {*} owner
 * @param {*} props
 * @internal
 */
var ReactElement = function (type, key, ref, self, source, owner, props) {
  var element = {
    // This tag allow us to uniquely identify this as a React Element
    $$typeof: REACT_ELEMENT_TYPE,

    // Built-in properties that belong on the element
    type: type,
    key: key,
    ref: ref,
    props: props,

    // Record the component responsible for creating this element.
    _owner: owner
  };

  if ("development" !== 'production') {
    // The validation flag is currently mutative. We put it on
    // an external backing store so that we can freeze the whole object.
    // This can be replaced with a WeakMap once they are implemented in
    // commonly used development environments.
    element._store = {};

    // To make comparing ReactElements easier for testing purposes, we make
    // the validation flag non-enumerable (where possible, which should
    // include every environment we run tests in), so the test framework
    // ignores it.
    if (canDefineProperty) {
      Object.defineProperty(element._store, 'validated', {
        configurable: false,
        enumerable: false,
        writable: true,
        value: false
      });
      // self and source are DEV only properties.
      Object.defineProperty(element, '_self', {
        configurable: false,
        enumerable: false,
        writable: false,
        value: self
      });
      // Two elements created in two different places should be considered
      // equal for testing purposes and therefore we hide it from enumeration.
      Object.defineProperty(element, '_source', {
        configurable: false,
        enumerable: false,
        writable: false,
        value: source
      });
    } else {
      element._store.validated = false;
      element._self = self;
      element._source = source;
    }
    if (Object.freeze) {
      Object.freeze(element.props);
      Object.freeze(element);
    }
  }

  return element;
};

/**
 * Create and return a new ReactElement of the given type.
 * See https://facebook.github.io/react/docs/top-level-api.html#react.createelement
 */
ReactElement.createElement = function (type, config, children) {
  var propName;

  // Reserved names are extracted
  var props = {};

  var key = null;
  var ref = null;
  var self = null;
  var source = null;

  if (config != null) {
    if (hasValidRef(config)) {
      ref = config.ref;
    }
    if (hasValidKey(config)) {
      key = '' + config.key;
    }

    self = config.__self === undefined ? null : config.__self;
    source = config.__source === undefined ? null : config.__source;
    // Remaining properties are added to a new props object
    for (propName in config) {
      if (hasOwnProperty.call(config, propName) && !RESERVED_PROPS.hasOwnProperty(propName)) {
        props[propName] = config[propName];
      }
    }
  }

  // Children can be more than one argument, and those are transferred onto
  // the newly allocated props object.
  var childrenLength = arguments.length - 2;
  if (childrenLength === 1) {
    props.children = children;
  } else if (childrenLength > 1) {
    var childArray = Array(childrenLength);
    for (var i = 0; i < childrenLength; i++) {
      childArray[i] = arguments[i + 2];
    }
    if ("development" !== 'production') {
      if (Object.freeze) {
        Object.freeze(childArray);
      }
    }
    props.children = childArray;
  }

  // Resolve default props
  if (type && type.defaultProps) {
    var defaultProps = type.defaultProps;
    for (propName in defaultProps) {
      if (props[propName] === undefined) {
        props[propName] = defaultProps[propName];
      }
    }
  }
  if ("development" !== 'production') {
    if (key || ref) {
      if (typeof props.$$typeof === 'undefined' || props.$$typeof !== REACT_ELEMENT_TYPE) {
        var displayName = typeof type === 'function' ? type.displayName || type.name || 'Unknown' : type;
        if (key) {
          defineKeyPropWarningGetter(props, displayName);
        }
        if (ref) {
          defineRefPropWarningGetter(props, displayName);
        }
      }
    }
  }
  return ReactElement(type, key, ref, self, source, ReactCurrentOwner.current, props);
};

/**
 * Return a function that produces ReactElements of a given type.
 * See https://facebook.github.io/react/docs/top-level-api.html#react.createfactory
 */
ReactElement.createFactory = function (type) {
  var factory = ReactElement.createElement.bind(null, type);
  // Expose the type on the factory and the prototype so that it can be
  // easily accessed on elements. E.g. `<Foo />.type === Foo`.
  // This should not be named `constructor` since this may not be the function
  // that created the element, and it may not even be a constructor.
  // Legacy hook TODO: Warn if this is accessed
  factory.type = type;
  return factory;
};

ReactElement.cloneAndReplaceKey = function (oldElement, newKey) {
  var newElement = ReactElement(oldElement.type, newKey, oldElement.ref, oldElement._self, oldElement._source, oldElement._owner, oldElement.props);

  return newElement;
};

/**
 * Clone and return a new ReactElement using element as the starting point.
 * See https://facebook.github.io/react/docs/top-level-api.html#react.cloneelement
 */
ReactElement.cloneElement = function (element, config, children) {
  var propName;

  // Original props are copied
  var props = _assign({}, element.props);

  // Reserved names are extracted
  var key = element.key;
  var ref = element.ref;
  // Self is preserved since the owner is preserved.
  var self = element._self;
  // Source is preserved since cloneElement is unlikely to be targeted by a
  // transpiler, and the original source is probably a better indicator of the
  // true owner.
  var source = element._source;

  // Owner will be preserved, unless ref is overridden
  var owner = element._owner;

  if (config != null) {
    if (hasValidRef(config)) {
      // Silently steal the ref from the parent.
      ref = config.ref;
      owner = ReactCurrentOwner.current;
    }
    if (hasValidKey(config)) {
      key = '' + config.key;
    }

    // Remaining properties override existing props
    var defaultProps;
    if (element.type && element.type.defaultProps) {
      defaultProps = element.type.defaultProps;
    }
    for (propName in config) {
      if (hasOwnProperty.call(config, propName) && !RESERVED_PROPS.hasOwnProperty(propName)) {
        if (config[propName] === undefined && defaultProps !== undefined) {
          // Resolve default props
          props[propName] = defaultProps[propName];
        } else {
          props[propName] = config[propName];
        }
      }
    }
  }

  // Children can be more than one argument, and those are transferred onto
  // the newly allocated props object.
  var childrenLength = arguments.length - 2;
  if (childrenLength === 1) {
    props.children = children;
  } else if (childrenLength > 1) {
    var childArray = Array(childrenLength);
    for (var i = 0; i < childrenLength; i++) {
      childArray[i] = arguments[i + 2];
    }
    props.children = childArray;
  }

  return ReactElement(element.type, key, ref, self, source, owner, props);
};

/**
 * Verifies the object is a ReactElement.
 * See https://facebook.github.io/react/docs/top-level-api.html#react.isvalidelement
 * @param {?object} object
 * @return {boolean} True if `object` is a valid component.
 * @final
 */
ReactElement.isValidElement = function (object) {
  return typeof object === 'object' && object !== null && object.$$typeof === REACT