(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('react'), require('react-dom')) :
  typeof define === 'function' && define.amd ? define(['exports', 'react', 'react-dom'], factory) :
  (global = global || self, factory(global.ReactTransitionGroup = {}, global.React, global.ReactDOM));
}(this, (function (exports, React, ReactDOM) { 'use strict';

  var React__default = 'default' in React ? React['default'] : React;
  ReactDOM = ReactDOM && Object.prototype.hasOwnProperty.call(ReactDOM, 'default') ? ReactDOM['default'] : ReactDOM;

  function _extends() {
    _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;
    };

    return _extends.apply(this, arguments);
  }

  function _objectWithoutPropertiesLoose(source, excluded) {
    if (source == null) return {};
    var target = {};
    var sourceKeys = Object.keys(source);
    var key, i;

    for (i = 0; i < sourceKeys.length; i++) {
      key = sourceKeys[i];
      if (excluded.indexOf(key) >= 0) continue;
      target[key] = source[key];
    }

    return target;
  }

  function _inheritsLoose(subClass, superClass) {
    subClass.prototype = Object.create(superClass.prototype);
    subClass.prototype.constructor = subClass;
    subClass.__proto__ = superClass;
  }

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

  var reactIs_development = createCommonjsModule(function (module, exports) {



  {
    (function() {

  // The Symbol used to tag the ReactElement-like types. If there is no native Symbol
  // nor polyfill, then a plain number is used for performance.
  var hasSymbol = typeof Symbol === 'function' && Symbol.for;
  var REACT_ELEMENT_TYPE = hasSymbol ? Symbol.for('react.element') : 0xeac7;
  var REACT_PORTAL_TYPE = hasSymbol ? Symbol.for('react.portal') : 0xeaca;
  var REACT_FRAGMENT_TYPE = hasSymbol ? Symbol.for('react.fragment') : 0xeacb;
  var REACT_STRICT_MODE_TYPE = hasSymbol ? Symbol.for('react.strict_mode') : 0xeacc;
  var REACT_PROFILER_TYPE = hasSymbol ? Symbol.for('react.profiler') : 0xead2;
  var REACT_PROVIDER_TYPE = hasSymbol ? Symbol.for('react.provider') : 0xeacd;
  var REACT_CONTEXT_TYPE = hasSymbol ? Symbol.for('react.context') : 0xeace; // TODO: We don't use AsyncMode or ConcurrentMode anymore. They were temporary
  // (unstable) APIs that have been removed. Can we remove the symbols?

  var REACT_ASYNC_MODE_TYPE = hasSymbol ? Symbol.for('react.async_mode') : 0xeacf;
  var REACT_CONCURRENT_MODE_TYPE = hasSymbol ? Symbol.for('react.concurrent_mode') : 0xeacf;
  var REACT_FORWARD_REF_TYPE = hasSymbol ? Symbol.for('react.forward_ref') : 0xead0;
  var REACT_SUSPENSE_TYPE = hasSymbol ? Symbol.for('react.suspense') : 0xead1;
  var REACT_SUSPENSE_LIST_TYPE = hasSymbol ? Symbol.for('react.suspense_list') : 0xead8;
  var REACT_MEMO_TYPE = hasSymbol ? Symbol.for('react.memo') : 0xead3;
  var REACT_LAZY_TYPE = hasSymbol ? Symbol.for('react.lazy') : 0xead4;
  var REACT_BLOCK_TYPE = hasSymbol ? Symbol.for('react.block') : 0xead9;
  var REACT_FUNDAMENTAL_TYPE = hasSymbol ? Symbol.for('react.fundamental') : 0xead5;
  var REACT_RESPONDER_TYPE = hasSymbol ? Symbol.for('react.responder') : 0xead6;
  var REACT_SCOPE_TYPE = hasSymbol ? Symbol.for('react.scope') : 0xead7;

  function isValidElementType(type) {
    return typeof type === 'string' || typeof type === 'function' || // Note: its typeof might be other than 'symbol' or 'number' if it's a polyfill.
    type === REACT_FRAGMENT_TYPE || type === REACT_CONCURRENT_MODE_TYPE || type === REACT_PROFILER_TYPE || type === REACT_STRICT_MODE_TYPE || type === REACT_SUSPENSE_TYPE || type === REACT_SUSPENSE_LIST_TYPE || typeof type === 'object' && type !== null && (type.$$typeof === REACT_LAZY_TYPE || type.$$typeof === REACT_MEMO_TYPE || type.$$typeof === REACT_PROVIDER_TYPE || type.$$typeof === REACT_CONTEXT_TYPE || type.$$typeof === REACT_FORWARD_REF_TYPE || type.$$typeof === REACT_FUNDAMENTAL_TYPE || type.$$typeof === REACT_RESPONDER_TYPE || type.$$typeof === REACT_SCOPE_TYPE || type.$$typeof === REACT_BLOCK_TYPE);
  }

  function typeOf(object) {
    if (typeof object === 'object' && object !== null) {
      var $$typeof = object.$$typeof;

      switch ($$typeof) {
        case REACT_ELEMENT_TYPE:
          var type = object.type;

          switch (type) {
            case REACT_ASYNC_MODE_TYPE:
            case REACT_CONCURRENT_MODE_TYPE:
            case REACT_FRAGMENT_TYPE:
            case REACT_PROFILER_TYPE:
            case REACT_STRICT_MODE_TYPE:
            case REACT_SUSPENSE_TYPE:
              return type;

            default:
              var $$typeofType = type && type.$$typeof;

              switch ($$typeofType) {
                case REACT_CONTEXT_TYPE:
                case REACT_FORWARD_REF_TYPE:
                case REACT_LAZY_TYPE:
                case REACT_MEMO_TYPE:
                case REACT_PROVIDER_TYPE:
                  return $$typeofType;

                default:
                  return $$typeof;
              }

          }

        case REACT_PORTAL_TYPE:
          return $$typeof;
      }
    }

    return undefined;
  } // AsyncMode is deprecated along with isAsyncMode

  var AsyncMode = REACT_ASYNC_MODE_TYPE;
  var ConcurrentMode = REACT_CONCURRENT_MODE_TYPE;
  var ContextConsumer = REACT_CONTEXT_TYPE;
  var ContextProvider = REACT_PROVIDER_TYPE;
  var Element = REACT_ELEMENT_TYPE;
  var ForwardRef = REACT_FORWARD_REF_TYPE;
  var Fragment = REACT_FRAGMENT_TYPE;
  var Lazy = REACT_LAZY_TYPE;
  var Memo = REACT_MEMO_TYPE;
  var Portal = REACT_PORTAL_TYPE;
  var Profiler = REACT_PROFILER_TYPE;
  var StrictMode = REACT_STRICT_MODE_TYPE;
  var Suspense = REACT_SUSPENSE_TYPE;
  var hasWarnedAboutDeprecatedIsAsyncMode = false; // AsyncMode should be deprecated

  function isAsyncMode(object) {
    {
      if (!hasWarnedAboutDeprecatedIsAsyncMode) {
        hasWarnedAboutDeprecatedIsAsyncMode = true; // Using console['warn'] to evade Babel and ESLint

        console['warn']('The ReactIs.isAsyncMode() alias has been deprecated, ' + 'and will be removed in React 17+. Update your code to use ' + 'ReactIs.isConcurrentMode() instead. It has the exact same API.');
      }
    }

    return isConcurrentMode(object) || typeOf(object) === REACT_ASYNC_MODE_TYPE;
  }
  function isConcurrentMode(object) {
    return typeOf(object) === REACT_CONCURRENT_MODE_TYPE;
  }
  function isContextConsumer(object) {
    return typeOf(object) === REACT_CONTEXT_TYPE;
  }
  function isContextProvider(object) {
    return typeOf(object) === REACT_PROVIDER_TYPE;
  }
  function isElement(object) {
    return typeof object === 'object' && object !== null && object.$$typeof === REACT_ELEMENT_TYPE;
  }
  function isForwardRef(object) {
    return typeOf(object) === REACT_FORWARD_REF_TYPE;
  }
  function isFragment(object) {
    return typeOf(object) === REACT_FRAGMENT_TYPE;
  }
  function isLazy(object) {
    return typeOf(object) === REACT_LAZY_TYPE;
  }
  function isMemo(object) {
    return typeOf(object) === REACT_MEMO_TYPE;
  }
  function isPortal(object) {
    return typeOf(object) === REACT_PORTAL_TYPE;
  }
  function isProfiler(object) {
    return typeOf(object) === REACT_PROFILER_TYPE;
  }
  function isStrictMode(object) {
    return typeOf(object) === REACT_STRICT_MODE_TYPE;
  }
  function isSuspense(object) {
    return typeOf(object) === REACT_SUSPENSE_TYPE;
  }

  exports.AsyncMode = AsyncMode;
  exports.ConcurrentMode = ConcurrentMode;
  exports.ContextConsumer = ContextConsumer;
  exports.ContextProvider = ContextProvider;
  exports.Element = Element;
  exports.ForwardRef = ForwardRef;
  exports.Fragment = Fragment;
  exports.Lazy = Lazy;
  exports.Memo = Memo;
  exports.Portal = Portal;
  exports.Profiler = Profiler;
  exports.StrictMode = StrictMode;
  exports.Suspense = Suspense;
  exports.isAsyncMode = isAsyncMode;
  exports.isConcurrentMode = isConcurrentMode;
  exports.isContextConsumer = isContextConsumer;
  exports.isContextProvider = isContextProvider;
  exports.isElement = isElement;
  exports.isForwardRef = isForwardRef;
  exports.isFragment = isFragment;
  exports.isLazy = isLazy;
  exports.isMemo = isMemo;
  exports.isPortal = isPortal;
  exports.isProfiler = isProfiler;
  exports.isStrictMode = isStrictMode;
  exports.isSuspense = isSuspense;
  exports.isValidElementType = isValidElementType;
  exports.typeOf = typeOf;
    })();
  }
  });
  var reactIs_development_1 = reactIs_development.AsyncMode;
  var reactIs_development_2 = reactIs_development.ConcurrentMode;
  var reactIs_development_3 = reactIs_development.ContextConsumer;
  var reactIs_development_4 = reactIs_development.ContextProvider;
  var reactIs_development_5 = reactIs_development.Element;
  var reactIs_development_6 = reactIs_development.ForwardRef;
  var reactIs_development_7 = reactIs_development.Fragment;
  var reactIs_development_8 = reactIs_development.Lazy;
  var reactIs_development_9 = reactIs_development.Memo;
  var reactIs_development_10 = reactIs_development.Portal;
  var reactIs_development_11 = reactIs_development.Profiler;
  var reactIs_development_12 = reactIs_development.StrictMode;
  var reactIs_development_13 = reactIs_development.Suspense;
  var reactIs_development_14 = reactIs_development.isAsyncMode;
  var reactIs_development_15 = reactIs_development.isConcurrentMode;
  var reactIs_development_16 = reactIs_development.isContextConsumer;
  var reactIs_development_17 = reactIs_development.isContextProvider;
  var reactIs_development_18 = reactIs_development.isElement;
  var reactIs_development_19 = reactIs_development.isForwardRef;
  var reactIs_development_20 = reactIs_development.isFragment;
  var reactIs_development_21 = reactIs_development.isLazy;
  var reactIs_development_22 = reactIs_development.isMemo;
  var reactIs_development_23 = reactIs_development.isPortal;
  var reactIs_development_24 = reactIs_development.isProfiler;
  var reactIs_development_25 = reactIs_development.isStrictMode;
  var reactIs_development_26 = reactIs_development.isSuspense;
  var reactIs_development_27 = reactIs_development.isValidElementType;
  var reactIs_development_28 = reactIs_development.typeOf;

  var reactIs = createCommonjsModule(function (module) {

  {
    module.exports = reactIs_development;
  }
  });

  /*
  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.
   */

  var ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';

  var ReactPropTypesSecret_1 = ReactPropTypesSecret;

  var printWarning = function() {};

  {
    var ReactPropTypesSecret$1 = ReactPropTypesSecret_1;
    var loggedTypeFailures = {};
    var has = Function.call.bind(Object.prototype.hasOwnProperty);

    printWarning = function(text) {
      var message = 'Warning: ' + text;
      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) {}
    };
  }

  /**
   * 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 (has(typeSpecs, 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.
            if (typeof typeSpecs[typeSpecName] !== 'function') {
              var err = Error(
                (componentName || 'React class') + ': ' + location + ' type `' + typeSpecName + '` is invalid; ' +
                'it must be a function, usually from the `prop-types` package, but received `' + typeof typeSpecs[typeSpecName] + '`.'
              );
              err.name = 'Invariant Violation';
              throw err;
            }
            error = typeSpecs[typeSpecName](values, typeSpecName, componentName, location, null, ReactPropTypesSecret$1);
          } catch (ex) {
            error = ex;
          }
          if (error && !(error instanceof Error)) {
            printWarning(
              (componentName || 'React class') + ': type specification of ' +
              location + ' `' + typeSpecName + '` is invalid; the type checker ' +
              'function must return `null` or an `Error` but returned a ' + typeof error + '. ' +
              'You may have forgotten to pass an argument to the type checker ' +
              'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' +
              'shape all require an argument).'
            );
          }
          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() : '';

            printWarning(
              'Failed ' + location + ' type: ' + error.message + (stack != null ? stack : '')
            );
          }
        }
      }
    }
  }

  /**
   * Resets warning cache when testing.
   *
   * @private
   */
  checkPropTypes.resetWarningCache = function() {
    {
      loggedTypeFailures = {};
    }
  };

  var checkPropTypes_1 = checkPropTypes;

  var has$1 = Function.call.bind(Object.prototype.hasOwnProperty);
  var printWarning$1 = function() {};

  {
    printWarning$1 = function(text) {
      var message = 'Warning: ' + text;
      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) {}
    };
  }

  function emptyFunctionThatReturnsNull() {
    return null;
  }

  var factoryWithTypeCheckers = function(isValidElement, throwOnDirectAccess) {
    /* global Symbol */
    var ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
    var FAUX_ITERATOR_SYMBOL = '@@iterator'; // Before Symbol spec.

    /**
     * Returns the iterator method function contained on the iterable object.
     *
     * Be sure to invoke the function with the iterable as context:
     *
     *     var iteratorFn = getIteratorFn(myIterable);
     *     if (iteratorFn) {
     *       var iterator = iteratorFn.call(myIterable);
     *       ...
     *     }
     *
     * @param {?object} maybeIterable
     * @return {?function}
     */
    function getIteratorFn(maybeIterable) {
      var iteratorFn = maybeIterable && (ITERATOR_SYMBOL && maybeIterable[ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL]);
      if (typeof iteratorFn === 'function') {
        return iteratorFn;
      }
    }

    /**
     * Collection of methods that allow declaration and validation of props that are
     * supplied to React components. Example usage:
     *
     *   var Props = require('ReactPropTypes');
     *   var MyArticle = React.createClass({
     *     propTypes: {
     *       // An optional string prop named "description".
     *       description: Props.string,
     *
     *       // A required enum prop named "category".
     *       category: Props.oneOf(['News','Photos']).isRequired,
     *
     *       // A prop named "dialog" that requires an instance of Dialog.
     *       dialog: Props.instanceOf(Dialog).isRequired
     *     },
     *     render: function() { ... }
     *   });
     *
     * A more formal specification of how these methods are used:
     *
     *   type := array|bool|func|object|number|string|oneOf([...])|instanceOf(...)
     *   decl := ReactPropTypes.{type}(.isRequired)?
     *
     * Each and every declaration produces a function with the same signature. This
     * allows the creation of custom validation functions. For example:
     *
     *  var MyLink = React.createClass({
     *    propTypes: {
     *      // An optional string or URI prop named "href".
     *      href: function(props, propName, componentName) {
     *        var propValue = props[propName];
     *        if (propValue != null && typeof propValue !== 'string' &&
     *            !(propValue instanceof URI)) {
     *          return new Error(
     *            'Expected a string or an URI for ' + propName + ' in ' +
     *            componentName
     *          );
     *        }
     *      }
     *    },
     *    render: function() {...}
     *  });
     *
     * @internal
     */

    var ANONYMOUS = '<<anonymous>>';

    // Important!
    // Keep this list in sync with production version in `./factoryWithThrowingShims.js`.
    var ReactPropTypes = {
      array: createPrimitiveTypeChecker('array'),
      bool: createPrimitiveTypeChecker('boolean'),
      func: createPrimitiveTypeChecker('function'),
      number: createPrimitiveTypeChecker('number'),
      object: createPrimitiveTypeChecker('object'),
      string: createPrimitiveTypeChecker('string'),
      symbol: createPrimitiveTypeChecker('symbol'),

      any: createAnyTypeChecker(),
      arrayOf: createArrayOfTypeChecker,
      element: createElementTypeChecker(),
      elementType: createElementTypeTypeChecker(),
      instanceOf: createInstanceTypeChecker,
      node: createNodeChecker(),
      objectOf: createObjectOfTypeChecker,
      oneOf: createEnumTypeChecker,
      oneOfType: createUnionTypeChecker,
      shape: createShapeTypeChecker,
      exact: createStrictShapeTypeChecker,
    };

    /**
     * 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
     */
    /*eslint-disable no-self-compare*/
    function is(x, y) {
      // SameValue algorithm
      if (x === y) {
        // Steps 1-5, 7-10
        // Steps 6.b-6.e: +0 != -0
        return x !== 0 || 1 / x === 1 / y;
      } else {
        // Step 6.a: NaN == NaN
        return x !== x && y !== y;
      }
    }
    /*eslint-enable no-self-compare*/

    /**
     * We use an Error-like object for backward compatibility as people may call
     * PropTypes directly and inspect their output. However, we don't use real
     * Errors anymore. We don't inspect their stack anyway, and creating them
     * is prohibitively expensive if they are created too often, such as what
     * happens in oneOfType() for any type before the one that matched.
     */
    function PropTypeError(message) {
      this.message = message;
      this.stack = '';
    }
    // Make `instanceof Error` still work for returned errors.
    PropTypeError.prototype = Error.prototype;

    function createChainableTypeChecker(validate) {
      {
        var manualPropTypeCallCache = {};
        var manualPropTypeWarningCount = 0;
      }
      function checkType(isRequired, props, propName, componentName, location, propFullName, secret) {
        componentName = componentName || ANONYMOUS;
        propFullName = propFullName || propName;

        if (secret !== ReactPropTypesSecret_1) {
          if (throwOnDirectAccess) {
            // New behavior only for users of `prop-types` package
            var err = new Error(
              'Calling PropTypes validators directly is not supported by the `prop-types` package. ' +
              'Use `PropTypes.checkPropTypes()` to call them. ' +
              'Read more at http://fb.me/use-check-prop-types'
            );
            err.name = 'Invariant Violation';
            throw err;
          } else if ( typeof console !== 'undefined') {
            // Old behavior for people using React.PropTypes
            var cacheKey = componentName + ':' + propName;
            if (
              !manualPropTypeCallCache[cacheKey] &&
              // Avoid spamming the console because they are often not actionable except for lib authors
              manualPropTypeWarningCount < 3
            ) {
              printWarning$1(
                'You are manually calling a React.PropTypes validation ' +
                'function for the `' + propFullName + '` prop on `' + componentName  + '`. This is deprecated ' +
                'and will throw in the standalone `prop-types` package. ' +
                'You may be seeing this warning due to a third-party PropTypes ' +
                'library. See https://fb.me/react-warning-dont-call-proptypes ' + 'for details.'
              );
              manualPropTypeCallCache[cacheKey] = true;
              manualPropTypeWarningCount++;
            }
          }
        }
        if (props[propName] == null) {
          if (isRequired) {
            if (props[propName] === null) {
              return new PropTypeError('The ' + location + ' `' + propFullName + '` is marked as required ' + ('in `' + componentName + '`, but its value is `null`.'));
            }
            return new PropTypeError('The ' + location + ' `' + propFullName + '` is marked as required in ' + ('`' + componentName + '`, but its value is `undefined`.'));
          }
          return null;
        } else {
          return validate(props, propName, componentName, location, propFullName);
        }
      }

      var chainedCheckType = checkType.bind(null, false);
      chainedCheckType.isRequired = checkType.bind(null, true);

      return chainedCheckType;
    }

    function createPrimitiveTypeChecker(expectedType) {
      function validate(props, propName, componentName, location, propFullName, secret) {
        var propValue = props[propName];
        var propType = getPropType(propValue);
        if (propType !== expectedType) {
          // `propValue` being instance of, say, date/regexp, pass the 'object'
          // check, but we can offer a more precise error message here rather than
          // 'of type `object`'.
          var preciseType = getPreciseType(propValue);

          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + preciseType + '` supplied to `' + componentName + '`, expected ') + ('`' + expectedType + '`.'));
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createAnyTypeChecker() {
      return createChainableTypeChecker(emptyFunctionThatReturnsNull);
    }

    function createArrayOfTypeChecker(typeChecker) {
      function validate(props, propName, componentName, location, propFullName) {
        if (typeof typeChecker !== 'function') {
          return new PropTypeError('Property `' + propFullName + '` of component `' + componentName + '` has invalid PropType notation inside arrayOf.');
        }
        var propValue = props[propName];
        if (!Array.isArray(propValue)) {
          var propType = getPropType(propValue);
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected an array.'));
        }
        for (var i = 0; i < propValue.length; i++) {
          var error = typeChecker(propValue, i, componentName, location, propFullName + '[' + i + ']', ReactPropTypesSecret_1);
          if (error instanceof Error) {
            return error;
          }
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createElementTypeChecker() {
      function validate(props, propName, componentName, location, propFullName) {
        var propValue = props[propName];
        if (!isValidElement(propValue)) {
          var propType = getPropType(propValue);
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected a single ReactElement.'));
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createElementTypeTypeChecker() {
      function validate(props, propName, componentName, location, propFullName) {
        var propValue = props[propName];
        if (!reactIs.isValidElementType(propValue)) {
          var propType = getPropType(propValue);
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected a single ReactElement type.'));
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createInstanceTypeChecker(expectedClass) {
      function validate(props, propName, componentName, location, propFullName) {
        if (!(props[propName] instanceof expectedClass)) {
          var expectedClassName = expectedClass.name || ANONYMOUS;
          var actualClassName = getClassName(props[propName]);
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + actualClassName + '` supplied to `' + componentName + '`, expected ') + ('instance of `' + expectedClassName + '`.'));
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createEnumTypeChecker(expectedValues) {
      if (!Array.isArray(expectedValues)) {
        {
          if (arguments.length > 1) {
            printWarning$1(
              'Invalid arguments supplied to oneOf, expected an array, got ' + arguments.length + ' arguments. ' +
              'A common mistake is to write oneOf(x, y, z) instead of oneOf([x, y, z]).'
            );
          } else {
            printWarning$1('Invalid argument supplied to oneOf, expected an array.');
          }
        }
        return emptyFunctionThatReturnsNull;
      }

      function validate(props, propName, componentName, location, propFullName) {
        var propValue = props[propName];
        for (var i = 0; i < expectedValues.length; i++) {
          if (is(propValue, expectedValues[i])) {
            return null;
          }
        }

        var valuesString = JSON.stringify(expectedValues, function replacer(key, value) {
          var type = getPreciseType(value);
          if (type === 'symbol') {
            return String(value);
          }
          return value;
        });
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of value `' + String(propValue) + '` ' + ('supplied to `' + componentName + '`, expected one of ' + valuesString + '.'));
      }
      return createChainableTypeChecker(validate);
    }

    function createObjectOfTypeChecker(typeChecker) {
      function validate(props, propName, componentName, location, propFullName) {
        if (typeof typeChecker !== 'function') {
          return new PropTypeError('Property `' + propFullName + '` of component `' + componentName + '` has invalid PropType notation inside objectOf.');
        }
        var propValue = props[propName];
        var propType = getPropType(propValue);
        if (propType !== 'object') {
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected an object.'));
        }
        for (var key in propValue) {
          if (has$1(propValue, key)) {
            var error = typeChecker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
            if (error instanceof Error) {
              return error;
            }
          }
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createUnionTypeChecker(arrayOfTypeCheckers) {
      if (!Array.isArray(arrayOfTypeCheckers)) {
         printWarning$1('Invalid argument supplied to oneOfType, expected an instance of array.') ;
        return emptyFunctionThatReturnsNull;
      }

      for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
        var checker = arrayOfTypeCheckers[i];
        if (typeof checker !== 'function') {
          printWarning$1(
            'Invalid argument supplied to oneOfType. Expected an array of check functions, but ' +
            'received ' + getPostfixForTypeWarning(checker) + ' at index ' + i + '.'
          );
          return emptyFunctionThatReturnsNull;
        }
      }

      function validate(props, propName, componentName, location, propFullName) {
        for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
          var checker = arrayOfTypeCheckers[i];
          if (checker(props, propName, componentName, location, propFullName, ReactPropTypesSecret_1) == null) {
            return null;
          }
        }

        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` supplied to ' + ('`' + componentName + '`.'));
      }
      return createChainableTypeChecker(validate);
    }

    function createNodeChecker() {
      function validate(props, propName, componentName, location, propFullName) {
        if (!isNode(props[propName])) {
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` supplied to ' + ('`' + componentName + '`, expected a ReactNode.'));
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createShapeTypeChecker(shapeTypes) {
      function validate(props, propName, componentName, location, propFullName) {
        var propValue = props[propName];
        var propType = getPropType(propValue);
        if (propType !== 'object') {
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type `' + propType + '` ' + ('supplied to `' + componentName + '`, expected `object`.'));
        }
        for (var key in shapeTypes) {
          var checker = shapeTypes[key];
          if (!checker) {
            continue;
          }
          var error = checker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
          if (error) {
            return error;
          }
        }
        return null;
      }
      return createChainableTypeChecker(validate);
    }

    function createStrictShapeTypeChecker(shapeTypes) {
      function validate(props, propName, componentName, location, propFullName) {
        var propValue = props[propName];
        var propType = getPropType(propValue);
        if (propType !== 'object') {
          return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type `' + propType + '` ' + ('supplied to `' + componentName + '`, expected `object`.'));
        }
        // We need to check all keys in case some are required but missing from
        // props.
        var allKeys = objectAssign({}, props[propName], shapeTypes);
        for (var key in allKeys) {
          var checker = shapeTypes[key];
          if (!checker) {
            return new PropTypeError(
              'Invalid ' + location + ' `' + propFullName + '` key `' + key + '` supplied to `' + componentName + '`.' +
              '\nBad object: ' + JSON.stringify(props[propName], null, '  ') +
              '\nValid keys: ' +  JSON.stringify(Object.keys(shapeTypes), null, '  ')
            );
          }
          var error = checker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
          if (error) {
            return error;
          }
        }
        return null;
      }

      return createChainableTypeChecker(validate);
    }

    function isNode(propValue) {
      switch (typeof propValue) {
        case 'number':
        case 'string':
        case 'undefined':
          return true;
        case 'boolean':
          return !propValue;
        case 'object':
          if (Array.isArray(propValue)) {
            return propValue.every(isNode);
          }
          if (propValue === null || isValidElement(propValue)) {
            return true;
          }

          var iteratorFn = getIteratorFn(propValue);
          if (iteratorFn) {
            var iterator = iteratorFn.call(propValue);
            var step;
            if (iteratorFn !== propValue.entries) {
              while (!(step = iterator.next()).done) {
                if (!isNode(step.value)) {
                  return false;
                }
              }
            } else {
              // Iterator will provide entry [k,v] tuples rather than values.
              while (!(step = iterator.next()).done) {
                var entry = step.value;
                if (entry) {
                  if (!isNode(entry[1])) {
                    return false;
                  }
                }
              }
            }
          } else {
            return false;
          }

          return true;
        default:
          return false;
      }
    }

    function isSymbol(propType, propValue) {
      // Native Symbol.
      if (propType === 'symbol') {
        return true;
      }

      // falsy value can't be a Symbol
      if (!propValue) {
        return false;
      }

      // 19.4.3.5 Symbol.prototype[@@toStringTag] === 'Symbol'
      if (propValue['@@toStringTag'] === 'Symbol') {
        return true;
      }

      // Fallback for non-spec compliant Symbols which are polyfilled.
      if (typeof Symbol === 'function' && propValue instanceof Symbol) {
        return true;
      }

      return false;
    }

    // Equivalent of `typeof` but with special handling for array and regexp.
    function getPropType(propValue) {
      var propType = typeof propValue;
      if (Array.isArray(propValue)) {
        return 'array';
      }
      if (propValue instanceof RegExp) {
        // Old webkits (at least until Android 4.0) return 'function' rather than
        // 'object' for typeof a RegExp. We'll normalize this here so that /bla/
        // passes PropTypes.object.
        return 'object';
      }
      if (isSymbol(propType, propValue)) {
        return 'symbol';
      }
      return propType;
    }

    // This handles more types than `getPropType`. Only used for error messages.
    // See `createPrimitiveTypeChecker`.
    function getPreciseType(propValue) {
      if (typeof propValue === 'undefined' || propValue === null) {
        return '' + propValue;
      }
      var propType = getPropType(propValue);
      if (propType === 'object') {
        if (propValue instanceof Date) {
          return 'date';
        } else if (propValue instanceof RegExp) {
          return 'regexp';
        }
      }
      return propType;
    }

    // Returns a string that is postfixed to a warning about an invalid type.
    // For example, "undefined" or "of type array"
    function getPostfixForTypeWarning(value) {
      var type = getPreciseType(value);
      switch (type) {
        case 'array':
        case 'object':
          return 'an ' + type;
        case 'boolean':
        case 'date':
        case 'regexp':
          return 'a ' + type;
        default:
          return type;
      }
    }

    // Returns class name of the object, if any.
    function getClassName(propValue) {
      if (!propValue.constructor || !propValue.constructor.name) {
        return ANONYMOUS;
      }
      return propValue.constructor.name;
    }

    ReactPropTypes.checkPropTypes = checkPropTypes_1;
    ReactPropTypes.resetWarningCache = checkPropTypes_1.resetWarningCache;
    ReactPropTypes.PropTypes = ReactPropTypes;

    return ReactPropTypes;
  };

  var propTypes = createCommonjsModule(function (module) {
  /**
   * 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 ReactIs = reactIs;

    // By explicitly using `prop-types` you are opting into new development behavior.
    // http://fb.me/prop-types-in-prod
    var throwOnDirectAccess = true;
    module.exports = factoryWithTypeCheckers(ReactIs.isElement, throwOnDirectAccess);
  }
  });
  var propTypes_1 = propTypes.object;
  var propTypes_2 = propTypes.oneOfType;
  var propTypes_3 = propTypes.element;
  var propTypes_4 = propTypes.bool;
  var propTypes_5 = propTypes.func;

  function hasClass(element, className) {
    if (element.classList) return !!className && element.classList.contains(className);
    return (" " + (element.className.baseVal || element.className) + " ").indexOf(" " + className + " ") !== -1;
  }

  function addClass(element, className) {
    if (element.classList) element.classList.add(className);else if (!hasClass(element, className)) if (typeof element.className === 'string') element.className = element.className + " " + className;else element.setAttribute('class', (element.className && element.className.baseVal || '') + " " + className);
  }

  function replaceClassName(origClass, classToRemove) {
    return origClass.replace(new RegExp("(^|\\s)" + classToRemove + "(?:\\s|$)", 'g'), '$1').replace(/\s+/g, ' ').replace(/^\s*|\s*$/g, '');
  }

  function removeClass(element, className) {
    if (element.classList) {
      element.classList.remove(className);
    } else if (typeof element.className === 'string') {
      element.className = replaceClassName(element.className, className);
    } else {
      element.setAttribute('class', replaceClassName(element.className && element.className.baseVal || '', className));
    }
  }

  var config = {
    disabled: false
  };

  var timeoutsShape =  propTypes.oneOfType([propTypes.number, propTypes.shape({
    enter: propTypes.number,
    exit: propTypes.number,
    appear: propTypes.number
  }).isRequired]) ;
  var classNamesShape =  propTypes.oneOfType([propTypes.string, propTypes.shape({
    enter: propTypes.string,
    exit: propTypes.string,
    active: propTypes.string
  }), propTypes.shape({
    enter: propTypes.string,
    enterDone: propTypes.string,
    enterActive: propTypes.string,
    exit: propTypes.string,
    exitDone: propTypes.string,
    exitActive: propTypes.string
  })]) ;

  var TransitionGroupContext = React__default.createContext(null);

  var forceReflow = function forceReflow(node) {
    return node.scrollTop;
  };

  var UNMOUNTED = 'unmounted';
  var EXITED = 'exited';
  var ENTERING = 'entering';
  var ENTERED = 'entered';
  var EXITING = 'exiting';
  /**
   * The Transition component lets you describe a transition from one component
   * state to another _over time_ with a simple declarative API. Most commonly
   * it's used to animate the mounting and unmounting of a component, but can also
   * be used to describe in-place transition states as well.
   *
   * ---
   *
   * **Note**: `Transition` is a platform-agnostic base component. If you're using
   * transitions in CSS, you'll probably want to use
   * [`CSSTransition`](https://reactcommunity.org/react-transition-group/css-transition)
   * instead. It inherits all the features of `Transition`, but contains
   * additional features necessary to play nice with CSS transitions (hence the
   * name of the component).
   *
   * ---
   *
   * By default the `Transition` component does not alter the behavior of the
   * component it renders, it only tracks "enter" and "exit" states for the
   * components. It's up to you to give meaning and effect to those states. For
   * example we can add styles to a component when it enters or exits:
   *
   * ```jsx
   * import { Transition } from 'react-transition-group';
   *
   * const duration = 300;
   *
   * const defaultStyle = {
   *   transition: `opacity ${duration}ms ease-in-out`,
   *   opacity: 0,
   * }
   *
   * const transitionStyles = {
   *   entering: { opacity: 1 },
   *   entered:  { opacity: 1 },
   *   exiting:  { opacity: 0 },
   *   exited:  { opacity: 0 },
   * };
   *
   * const Fade = ({ in: inProp }) => (
   *   <Transition in={inProp} timeout={duration}>
   *     {state => (
   *       <div style={{
   *         ...defaultStyle,
   *         ...transitionStyles[state]
   *       }}>
   *         I'm a fade Transition!
   *       </div>
   *     )}
   *   </Transition>
   * );
   * ```
   *
   * There are 4 main states a Transition can be in:
   *  - `'entering'`
   *  - `'entered'`
   *  - `'exiting'`
   *  - `'exited'`
   *
   * Transition state is toggled via the `in` prop. When `true` the component
   * begins the "Enter" stage. During this stage, the component will shift from
   * its current transition state, to `'entering'` for the duration of the
   * transition and then to the `'entered'` stage once it's complete. Let's take
   * the following example (we'll use the
   * [useState](https://reactjs.org/docs/hooks-reference.html#usestate) hook):
   *
   * ```jsx
   * function App() {
   *   const [inProp, setInProp] = useState(false);
   *   return (
   *     <div>
   *       <Transition in={inProp} timeout={500}>
   *         {state => (
   *           // ...
   *         )}
   *       </Transition>
   *       <button onClick={() => setInProp(true)}>
   *         Click to Enter
   *       </button>
   *     </div>
   *   );
   * }
   * ```
   *
   * When the button is clicked the component will shift to the `'entering'` state
   * and stay there for 500ms (the value of `timeout`) before it finally switches
   * to `'entered'`.
   *
   * When `in` is `false` the same thing happens except the state moves from
   * `'exiting'` to `'exited'`.
   */

  var Transition = /*#__PURE__*/function (_React$Component) {
    _inheritsLoose(Transition, _React$Component);

    function Transition(props, context) {
      var _this;

      _this = _React$Component.call(this, props, context) || this;
      var parentGroup = context; // In the context of a TransitionGroup all enters are really appears

      var appear = parentGroup && !parentGroup.isMounting ? props.enter : props.appear;
      var initialStatus;
      _this.appearStatus = null;

      if (props.in) {
        if (appear) {
          initialStatus = EXITED;
          _this.appearStatus = ENTERING;
        } else {
          initialStatus = ENTERED;
        }
      } else {
        if (props.unmountOnExit || props.mountOnEnter) {
          initialStatus = UNMOUNTED;
        } else {
          initialStatus = EXITED;
        }
      }

      _this.state = {
        status: initialStatus
      };
      _this.nextCallback = null;
      return _this;
    }

    Transition.getDerivedStateFromProps = function getDerivedStateFromProps(_ref, prevState) {
      var nextIn = _ref.in;

      if (nextIn && prevState.status === UNMOUNTED) {
        return {
          status: EXITED
        };
      }

      return null;
    } // getSnapshotBeforeUpdate(prevProps) {
    //   let nextStatus = null
    //   if (prevProps !== this.props) {
    //     const { status } = this.state
    //     if (this.props.in) {
    //       if (status !== ENTERING && status !== ENTERED) {
    //         nextStatus = ENTERING
    //       }
    //     } else {
    //       if (status === ENTERING || status === ENTERED) {
    //         nextStatus = EXITING
    //       }
    //     }
    //   }
    //   return { nextStatus }
    // }
    ;

    var _proto = Transition.prototype;

    _proto.componentDidMount = function componentDidMount() {
      this.updateStatus(true, this.appearStatus);
    };

    _proto.componentDidUpdate = function componentDidUpdate(prevProps) {
      var nextStatus = null;

      if (prevProps !== this.props) {
        var status = this.state.status;

        if (this.props.in) {
          if (status !== ENTERING && status !== ENTERED) {
            nextStatus = ENTERING;
          }
        } else {
          if (status === ENTERING || status === ENTERED) {
            nextStatus = EXITING;
          }
        }
      }

      this.updateStatus(false, nextStatus);
    };

    _proto.componentWillUnmount = function componentWillUnmount() {
      this.cancelNextCallback();
    };

    _proto.getTimeouts = function getTimeouts() {
      var timeout = this.props.timeout;
      var exit, enter, appear;
      exit = enter = appear = timeout;

      if (timeout != null && typeof timeout !== 'number') {
        exit = timeout.exit;
        enter = timeout.enter; // TODO: remove fallback for next major

        appear = timeout.appear !== undefined ? timeout.appear : enter;
      }

      return {
        exit: exit,
        enter: enter,
        appear: appear
      };
    };

    _proto.updateStatus = function updateStatus(mounting, nextStatus) {
      if (mounting === void 0) {
        mounting = false;
      }

      if (nextStatus !== null) {
        // nextStatus will always be ENTERING or EXITING.
        this.cancelNextCallback();

        if (nextStatus === ENTERING) {
          if (this.props.unmountOnExit || this.props.mountOnEnter) {
            var node = this.props.nodeRef ? this.props.nodeRef.current : ReactDOM.findDOMNode(this); // https://github.com/reactjs/react-transition-group/pull/749
            // With unmountOnExit or mountOnEnter, the enter animation should happen at the transition between `exited` and `entering`.
            // To make the animation happen,  we have to separate each rendering and avoid being processed as batched.

            if (node) forceReflow(node);
          }

          this.performEnter(mounting);
        } else {
          this.performExit();
        }
      } else if (this.props.unmountOnExit && this.state.status === EXITED) {
        this.setState({
          status: UNMOUNTED
        });
      }
    };

    _proto.performEnter = function performEnter(mounting) {
      var _this2 = this;

      var enter = this.props.enter;
      var appearing = this.context ? this.context.isMounting : mounting;

      var _ref2 = this.props.nodeRef ? [appearing] : [ReactDOM.findDOMNode(this), appearing],
          maybeNode = _ref2[0],
          maybeAppearing = _ref2[1];

      var timeouts = this.getTimeouts();
      var enterTimeout = appearing ? timeouts.appear : timeouts.enter; // no enter animation skip right to ENTERED
      // if we are mounting and running this it means appear _must_ be set

      if (!mounting && !enter || config.disabled) {
        this.safeSetState({
          status: ENTERED
        }, function () {
          _this2.props.onEntered(maybeNode);
        });
        return;
      }

      this.props.onEnter(maybeNode, maybeAppearing);
      this.safeSetState({
        status: ENTERING
      }, function () {
        _this2.props.onEntering(maybeNode, maybeAppearing);

        _this2.onTransitionEnd(enterTimeout, function () {
          _this2.safeSetState({
            status: ENTERED
          }, function () {
            _this2.props.onEntered(maybeNode, maybeAppearing);
          });
        });
      });
    };

    _proto.performExit = function performExit() {
      var _this3 = this;

      var exit = this.props.exit;
      var timeouts = this.getTimeouts();
      var maybeNode = this.props.nodeRef ? undefined : ReactDOM.findDOMNode(this); // no exit animation skip right to EXITED

      if (!exit || config.disabled) {
        this.safeSetState({
          status: EXITED
        }, function () {
          _this3.props.onExited(maybeNode);
        });
        return;
      }

      this.props.onExit(maybeNode);
      this.safeSetState({
        status: EXITING
      }, function () {
        _this3.props.onExiting(maybeNode);

        _this3.onTransitionEnd(timeouts.exit, function () {
          _this3.safeSetState({
            status: EXITED
          }, function () {
            _this3.props.onExited(maybeNode);
          });
        });
      });
    };

    _proto.cancelNextCallback = function cancelNextCallback() {
      if (this.nextCallback !== null) {
        this.nextCallback.cancel();
        this.nextCallback = null;
      }
    };

    _proto.safeSetState = function safeSetState(nextState, callback) {
      // This shouldn't be necessary, but there are weird race conditions with
      // setState callbacks and unmounting in testing, so always make sure that
      // we can cancel any pending setState callbacks after we unmount.
      callback = this.setNextCallback(callback);
      this.setState(nextState, callback);
    };

    _proto.setNextCallback = function setNextCallback(callback) {
      var _this4 = this;

      var active = true;

      this.nextCallback = function (event) {
        if (active) {
          active = false;
          _this4.nextCallback = null;
          callback(event);
        }
      };

      this.nextCallback.cancel = function () {
        active = false;
      };

      return this.nextCallback;
    };

    _proto.onTransitionEnd = function onTransitionEnd(timeout, handler) {
      this.setNextCallback(handler);
      var node = this.props.nodeRef ? this.props.nodeRef.current : ReactDOM.findDOMNode(this);
      var doesNotHaveTimeoutOrListener = timeout == null && !this.props.addEndListener;

      if (!node || doesNotHaveTimeoutOrListener) {
        setTimeout(this.nextCallback, 0);
        return;
      }

      if (this.props.addEndListener) {
        var _ref3 = this.props.nodeRef ? [this.nextCallback] : [node, this.nextCallback],
            maybeNode = _ref3[0],
            maybeNextCallback = _ref3[1];

        this.props.addEndListener(maybeNode, maybeNextCallback);
      }

      if (timeout != null) {
        setTimeout(this.nextCallback, timeout);
      }
    };

    _proto.render = function render() {
      var status = this.state.status;

      if (status === UNMOUNTED) {
        return null;
      }

      var _this$props = this.props,
          children = _this$props.children,
          _in = _this$props.in,
          _mountOnEnter = _this$props.mountOnEnter,
          _unmountOnExit = _this$props.unmountOnExit,
          _appear = _this$props.appear,
          _enter = _this$props.enter,
          _exit = _this$props.exit,
          _timeout = _this$props.timeout,
          _addEndListener = _this$props.addEndListener,
          _onEnter = _this$props.onEnter,
          _onEntering = _this$props.onEntering,
          _onEntered = _this$props.onEntered,
          _onExit = _this$props.onExit,
          _onExiting = _this$props.onExiting,
          _onExited = _this$props.onExited,
          _nodeRef = _this$props.nodeRef,
          childProps = _objectWithoutPropertiesLoose(_this$props, ["children", "in", "mountOnEnter", "unmountOnExit", "appear", "enter", "exit", "timeout", "addEndListener", "onEnter", "onEntering", "onEntered", "onExit", "onExiting", "onExited", "nodeRef"]);

      return (
        /*#__PURE__*/
        // allows for nested Transitions
        React__default.createElement(TransitionGroupContext.Provider, {
          value: null
        }, typeof children === 'function' ? children(status, childProps) : React__default.cloneElement(React__default.Children.only(children), childProps))
      );
    };

    return Transition;
  }(React__default.Component);

  Transition.contextType = TransitionGroupContext;
  Transition.propTypes =  {
    /**
     * A React reference to DOM element that need to transition:
     * https://stackoverflow.com/a/51127130/4671932
     *
     *   - When `nodeRef` prop is used, `node` is not passed to callback functions
     *      (e.g. `onEnter`) because user already has direct access to the node.
     *   - When changing `key` prop of `Transition` in a `TransitionGroup` a new
     *     `nodeRef` need to be provided to `Transition` with changed `key` prop
     *     (see
     *     [test/CSSTransition-test.js](https://github.com/reactjs/react-transition-group/blob/13435f897b3ab71f6e19d724f145596f5910581c/test/CSSTransition-test.js#L362-L437)).
     */
    nodeRef: propTypes.shape({
      current: typeof Element === 'undefined' ? propTypes.any : function (propValue, key, componentName, location, propFullName, secret) {
        var value = propValue[key];
        return propTypes.instanceOf(value && 'ownerDocument' in value ? value.ownerDocument.defaultView.Element : Element)(propValue, key, componentName, location, propFullName, secret);
      }
    }),

    /**
     * A `function` child can be used instead of a React element. This function is
     * called with the current transition status (`'entering'`, `'entered'`,
     * `'exiting'`, `'exited'`), which can be used to apply context
     * specific props to a component.
     *
     * ```jsx
     * <Transition in={this.state.in} timeout={150}>
     *   {state => (
     *     <MyComponent className={`fade fade-${state}`} />
     *   )}
     * </Transition>
     * ```
     */
    children: propTypes.oneOfType([propTypes.func.isRequired, propTypes.element.isRequired]).isRequired,

    /**
     * Show the component; triggers the enter or exit states
     */
    in: propTypes.bool,

    /**
     * By default the child component is mounted immediately along with
     * the parent `Transition` component. If you want to "lazy mount" the component on the
     * first `in={true}` you can set `mountOnEnter`. After the first enter transition the component will stay
     * mounted, even on "exited", unless you also specify `unmountOnExit`.
     */
    mountOnEnter: propTypes.bool,

    /**
     * By default the child component stays mounted after it reaches the `'exited'` state.
     * Set `unmountOnExit` if you'd prefer to unmount the component after it finishes exiting.
     */
    unmountOnExit: propTypes.bool,

    /**
     * By default the child component does not perform the enter transition when
     * it first mounts, regardless of the value of `in`. If you want this
     * behavior, set both `appear` and `in` to `true`.
     *
     * > **Note**: there are no special appear states like `appearing`/`appeared`, this prop
     * > only adds an additional enter transition. However, in the
     * > `<CSSTransition>` component that first enter transition does result in
     * > additional `.appear-*` classes, that way you can choose to style it
     * > differently.
     */
    appear: propTypes.bool,

    /**
     * Enable or disable enter transitions.
     */
    enter: propTypes.bool,

    /**
     * Enable or disable exit transitions.
     */
    exit: propTypes.bool,

    /**
     * The duration of the transition, in milliseconds.
     * Required unless `addEndListener` is provided.
     *
     * You may specify a single timeout for all transitions:
     *
     * ```jsx
     * timeout={500}
     * ```
     *
     * or individually:
     *
     * ```jsx
     * timeout={{
     *  appear: 500,
     *  enter: 300,
     *  exit: 500,
     * }}
     * ```
     *
     * - `appear` defaults to the value of `enter`
     * - `enter` defaults to `0`
     * - `exit` defaults to `0`
     *
     * @type {number | { enter?: number, exit?: number, appear?: number }}
     */
    timeout: function timeout(props) {
      var pt = timeoutsShape;
      if (!props.addEndListener) pt = pt.isRequired;

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

      return pt.apply(void 0, [props].concat(args));
    },

    /**
     * Add a custom transition end trigger. Called with the transitioning
     * DOM node and a `done` callback. Allows for more fine grained transition end
     * logic. Timeouts are still used as a fallback if provided.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * ```jsx
     * addEndListener={(node, done) => {
     *   // use the css transitionend event to mark the finish of a transition
     *   node.addEventListener('transitionend', done, false);
     * }}
     * ```
     */
    addEndListener: propTypes.func,

    /**
     * Callback fired before the "entering" status is applied. An extra parameter
     * `isAppearing` is supplied to indicate if the enter stage is occurring on the initial mount
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement, isAppearing: bool) -> void
     */
    onEnter: propTypes.func,

    /**
     * Callback fired after the "entering" status is applied. An extra parameter
     * `isAppearing` is supplied to indicate if the enter stage is occurring on the initial mount
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement, isAppearing: bool)
     */
    onEntering: propTypes.func,

    /**
     * Callback fired after the "entered" status is applied. An extra parameter
     * `isAppearing` is supplied to indicate if the enter stage is occurring on the initial mount
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement, isAppearing: bool) -> void
     */
    onEntered: propTypes.func,

    /**
     * Callback fired before the "exiting" status is applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement) -> void
     */
    onExit: propTypes.func,

    /**
     * Callback fired after the "exiting" status is applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement) -> void
     */
    onExiting: propTypes.func,

    /**
     * Callback fired after the "exited" status is applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed
     *
     * @type Function(node: HtmlElement) -> void
     */
    onExited: propTypes.func
  } ; // Name the function so it is clearer in the documentation

  function noop() {}

  Transition.defaultProps = {
    in: false,
    mountOnEnter: false,
    unmountOnExit: false,
    appear: false,
    enter: true,
    exit: true,
    onEnter: noop,
    onEntering: noop,
    onEntered: noop,
    onExit: noop,
    onExiting: noop,
    onExited: noop
  };
  Transition.UNMOUNTED = UNMOUNTED;
  Transition.EXITED = EXITED;
  Transition.ENTERING = ENTERING;
  Transition.ENTERED = ENTERED;
  Transition.EXITING = EXITING;

  var _addClass = function addClass$1(node, classes) {
    return node && classes && classes.split(' ').forEach(function (c) {
      return addClass(node, c);
    });
  };

  var removeClass$1 = function removeClass$1(node, classes) {
    return node && classes && classes.split(' ').forEach(function (c) {
      return removeClass(node, c);
    });
  };
  /**
   * A transition component inspired by the excellent
   * [ng-animate](https://docs.angularjs.org/api/ngAnimate) library, you should
   * use it if you're using CSS transitions or animations. It's built upon the
   * [`Transition`](https://reactcommunity.org/react-transition-group/transition)
   * component, so it inherits all of its props.
   *
   * `CSSTransition` applies a pair of class names during the `appear`, `enter`,
   * and `exit` states of the transition. The first class is applied and then a
   * second `*-active` class in order to activate the CSS transition. After the
   * transition, matching `*-done` class names are applied to persist the
   * transition state.
   *
   * ```jsx
   * function App() {
   *   const [inProp, setInProp] = useState(false);
   *   return (
   *     <div>
   *       <CSSTransition in={inProp} timeout={200} classNames="my-node">
   *         <div>
   *           {"I'll receive my-node-* classes"}
   *         </div>
   *       </CSSTransition>
   *       <button type="button" onClick={() => setInProp(true)}>
   *         Click to Enter
   *       </button>
   *     </div>
   *   );
   * }
   * ```
   *
   * When the `in` prop is set to `true`, the child component will first receive
   * the class `example-enter`, then the `example-enter-active` will be added in
   * the next tick. `CSSTransition` [forces a
   * reflow](https://github.com/reactjs/react-transition-group/blob/5007303e729a74be66a21c3e2205e4916821524b/src/CSSTransition.js#L208-L215)
   * between before adding the `example-enter-active`. This is an important trick
   * because it allows us to transition between `example-enter` and
   * `example-enter-active` even though they were added immediately one after
   * another. Most notably, this is what makes it possible for us to animate
   * _appearance_.
   *
   * ```css
   * .my-node-enter {
   *   opacity: 0;
   * }
   * .my-node-enter-active {
   *   opacity: 1;
   *   transition: opacity 200ms;
   * }
   * .my-node-exit {
   *   opacity: 1;
   * }
   * .my-node-exit-active {
   *   opacity: 0;
   *   transition: opacity 200ms;
   * }
   * ```
   *
   * `*-active` classes represent which styles you want to animate **to**, so it's
   * important to add `transition` declaration only to them, otherwise transitions
   * might not behave as intended! This might not be obvious when the transitions
   * are symmetrical, i.e. when `*-enter-active` is the same as `*-exit`, like in
   * the example above (minus `transition`), but it becomes apparent in more
   * complex transitions.
   *
   * **Note**: If you're using the
   * [`appear`](http://reactcommunity.org/react-transition-group/transition#Transition-prop-appear)
   * prop, make sure to define styles for `.appear-*` classes as well.
   */


  var CSSTransition = /*#__PURE__*/function (_React$Component) {
    _inheritsLoose(CSSTransition, _React$Component);

    function CSSTransition() {
      var _this;

      for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
        args[_key] = arguments[_key];
      }

      _this = _React$Component.call.apply(_React$Component, [this].concat(args)) || this;
      _this.appliedClasses = {
        appear: {},
        enter: {},
        exit: {}
      };

      _this.onEnter = function (maybeNode, maybeAppearing) {
        var _this$resolveArgument = _this.resolveArguments(maybeNode, maybeAppearing),
            node = _this$resolveArgument[0],
            appearing = _this$resolveArgument[1];

        _this.removeClasses(node, 'exit');

        _this.addClass(node, appearing ? 'appear' : 'enter', 'base');

        if (_this.props.onEnter) {
          _this.props.onEnter(maybeNode, maybeAppearing);
        }
      };

      _this.onEntering = function (maybeNode, maybeAppearing) {
        var _this$resolveArgument2 = _this.resolveArguments(maybeNode, maybeAppearing),
            node = _this$resolveArgument2[0],
            appearing = _this$resolveArgument2[1];

        var type = appearing ? 'appear' : 'enter';

        _this.addClass(node, type, 'active');

        if (_this.props.onEntering) {
          _this.props.onEntering(maybeNode, maybeAppearing);
        }
      };

      _this.onEntered = function (maybeNode, maybeAppearing) {
        var _this$resolveArgument3 = _this.resolveArguments(maybeNode, maybeAppearing),
            node = _this$resolveArgument3[0],
            appearing = _this$resolveArgument3[1];

        var type = appearing ? 'appear' : 'enter';

        _this.removeClasses(node, type);

        _this.addClass(node, type, 'done');

        if (_this.props.onEntered) {
          _this.props.onEntered(maybeNode, maybeAppearing);
        }
      };

      _this.onExit = function (maybeNode) {
        var _this$resolveArgument4 = _this.resolveArguments(maybeNode),
            node = _this$resolveArgument4[0];

        _this.removeClasses(node, 'appear');

        _this.removeClasses(node, 'enter');

        _this.addClass(node, 'exit', 'base');

        if (_this.props.onExit) {
          _this.props.onExit(maybeNode);
        }
      };

      _this.onExiting = function (maybeNode) {
        var _this$resolveArgument5 = _this.resolveArguments(maybeNode),
            node = _this$resolveArgument5[0];

        _this.addClass(node, 'exit', 'active');

        if (_this.props.onExiting) {
          _this.props.onExiting(maybeNode);
        }
      };

      _this.onExited = function (maybeNode) {
        var _this$resolveArgument6 = _this.resolveArguments(maybeNode),
            node = _this$resolveArgument6[0];

        _this.removeClasses(node, 'exit');

        _this.addClass(node, 'exit', 'done');

        if (_this.props.onExited) {
          _this.props.onExited(maybeNode);
        }
      };

      _this.resolveArguments = function (maybeNode, maybeAppearing) {
        return _this.props.nodeRef ? [_this.props.nodeRef.current, maybeNode] // here `maybeNode` is actually `appearing`
        : [maybeNode, maybeAppearing];
      };

      _this.getClassNames = function (type) {
        var classNames = _this.props.classNames;
        var isStringClassNames = typeof classNames === 'string';
        var prefix = isStringClassNames && classNames ? classNames + "-" : '';
        var baseClassName = isStringClassNames ? "" + prefix + type : classNames[type];
        var activeClassName = isStringClassNames ? baseClassName + "-active" : classNames[type + "Active"];
        var doneClassName = isStringClassNames ? baseClassName + "-done" : classNames[type + "Done"];
        return {
          baseClassName: baseClassName,
          activeClassName: activeClassName,
          doneClassName: doneClassName
        };
      };

      return _this;
    }

    var _proto = CSSTransition.prototype;

    _proto.addClass = function addClass(node, type, phase) {
      var className = this.getClassNames(type)[phase + "ClassName"];

      var _this$getClassNames = this.getClassNames('enter'),
          doneClassName = _this$getClassNames.doneClassName;

      if (type === 'appear' && phase === 'done' && doneClassName) {
        className += " " + doneClassName;
      } // This is to force a repaint,
      // which is necessary in order to transition styles when adding a class name.


      if (phase === 'active') {
        if (node) forceReflow(node);
      }

      if (className) {
        this.appliedClasses[type][phase] = className;

        _addClass(node, className);
      }
    };

    _proto.removeClasses = function removeClasses(node, type) {
      var _this$appliedClasses$ = this.appliedClasses[type],
          baseClassName = _this$appliedClasses$.base,
          activeClassName = _this$appliedClasses$.active,
          doneClassName = _this$appliedClasses$.done;
      this.appliedClasses[type] = {};

      if (baseClassName) {
        removeClass$1(node, baseClassName);
      }

      if (activeClassName) {
        removeClass$1(node, activeClassName);
      }

      if (doneClassName) {
        removeClass$1(node, doneClassName);
      }
    };

    _proto.render = function render() {
      var _this$props = this.props,
          _ = _this$props.classNames,
          props = _objectWithoutPropertiesLoose(_this$props, ["classNames"]);

      return /*#__PURE__*/React__default.createElement(Transition, _extends({}, props, {
        onEnter: this.onEnter,
        onEntered: this.onEntered,
        onEntering: this.onEntering,
        onExit: this.onExit,
        onExiting: this.onExiting,
        onExited: this.onExited
      }));
    };

    return CSSTransition;
  }(React__default.Component);

  CSSTransition.defaultProps = {
    classNames: ''
  };
  CSSTransition.propTypes =  _extends({}, Transition.propTypes, {
    /**
     * The animation classNames applied to the component as it appears, enters,
     * exits or has finished the transition. A single name can be provided, which
     * will be suffixed for each stage, e.g. `classNames="fade"` applies:
     *
     * - `fade-appear`, `fade-appear-active`, `fade-appear-done`
     * - `fade-enter`, `fade-enter-active`, `fade-enter-done`
     * - `fade-exit`, `fade-exit-active`, `fade-exit-done`
     *
     * A few details to note about how these classes are applied:
     *
     * 1. They are _joined_ with the ones that are already defined on the child
     *    component, so if you want to add some base styles, you can use
     *    `className` without worrying that it will be overridden.
     *
     * 2. If the transition component mounts with `in={false}`, no classes are
     *    applied yet. You might be expecting `*-exit-done`, but if you think
     *    about it, a component cannot finish exiting if it hasn't entered yet.
     *
     * 2. `fade-appear-done` and `fade-enter-done` will _both_ be applied. This
     *    allows you to define different behavior for when appearing is done and
     *    when regular entering is done, using selectors like
     *    `.fade-enter-done:not(.fade-appear-done)`. For example, you could apply
     *    an epic entrance animation when element first appears in the DOM using
     *    [Animate.css](https://daneden.github.io/animate.css/). Otherwise you can
     *    simply use `fade-enter-done` for defining both cases.
     *
     * Each individual classNames can also be specified independently like:
     *
     * ```js
     * classNames={{
     *  appear: 'my-appear',
     *  appearActive: 'my-active-appear',
     *  appearDone: 'my-done-appear',
     *  enter: 'my-enter',
     *  enterActive: 'my-active-enter',
     *  enterDone: 'my-done-enter',
     *  exit: 'my-exit',
     *  exitActive: 'my-active-exit',
     *  exitDone: 'my-done-exit',
     * }}
     * ```
     *
     * If you want to set these classes using CSS Modules:
     *
     * ```js
     * import styles from './styles.css';
     * ```
     *
     * you might want to use camelCase in your CSS file, that way could simply
     * spread them instead of listing them one by one:
     *
     * ```js
     * classNames={{ ...styles }}
     * ```
     *
     * @type {string | {
     *  appear?: string,
     *  appearActive?: string,
     *  appearDone?: string,
     *  enter?: string,
     *  enterActive?: string,
     *  enterDone?: string,
     *  exit?: string,
     *  exitActive?: string,
     *  exitDone?: string,
     * }}
     */
    classNames: classNamesShape,

    /**
     * A `<Transition>` callback fired immediately after the 'enter' or 'appear' class is
     * applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement, isAppearing: bool)
     */
    onEnter: propTypes.func,

    /**
     * A `<Transition>` callback fired immediately after the 'enter-active' or
     * 'appear-active' class is applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement, isAppearing: bool)
     */
    onEntering: propTypes.func,

    /**
     * A `<Transition>` callback fired immediately after the 'enter' or
     * 'appear' classes are **removed** and the `done` class is added to the DOM node.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed.
     *
     * @type Function(node: HtmlElement, isAppearing: bool)
     */
    onEntered: propTypes.func,

    /**
     * A `<Transition>` callback fired immediately after the 'exit' class is
     * applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed
     *
     * @type Function(node: HtmlElement)
     */
    onExit: propTypes.func,

    /**
     * A `<Transition>` callback fired immediately after the 'exit-active' is applied.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed
     *
     * @type Function(node: HtmlElement)
     */
    onExiting: propTypes.func,

    /**
     * A `<Transition>` callback fired immediately after the 'exit' classes
     * are **removed** and the `exit-done` class is added to the DOM node.
     *
     * **Note**: when `nodeRef` prop is passed, `node` is not passed
     *
     * @type Function(node: HtmlElement)
     */
    onExited: propTypes.func
  }) ;

  function _assertThisInitialized(self) {
    if (self === void 0) {
      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
    }

    return self;
  }

  /**
   * Given `this.props.children`, return an object mapping key to child.
   *
   * @param {*} children `this.props.children`
   * @return {object} Mapping of key to child
   */

  function getChildMapping(children, mapFn) {
    var mapper = function mapper(child) {
      return mapFn && React.isValidElement(child) ? mapFn(child) : child;
    };

    var result = Object.create(null);
    if (children) React.Children.map(children, function (c) {
      return c;
    }).forEach(function (child) {
      // run the map function here instead so that the key is the computed one
      result[child.key] = mapper(child);
    });
    return result;
  }
  /**
   * When you're adding or removing children some may be added or removed in the
   * same render pass. We want to show *both* since we want to simultaneously
   * animate elements in and out. This function takes a previous set of keys
   * and a new set of keys and merges them with its best guess of the correct
   * ordering. In the future we may expose some of the utilities in
   * ReactMultiChild to make this easy, but for now React itself does not
   * directly have this concept of the union of prevChildren and nextChildren
   * so we implement it here.
   *
   * @param {object} prev prev children as returned from
   * `ReactTransitionChildMapping.getChildMapping()`.
   * @param {object} next next children as returned from
   * `ReactTransitionChildMapping.getChildMapping()`.
   * @return {object} a key set that contains all keys in `prev` and all keys
   * in `next` in a reasonable order.
   */

  function mergeChildMappings(prev, next) {
    prev = prev || {};
    next = next || {};

    function getValueForKey(key) {
      return key in next ? next[key] : prev[key];
    } // For each key of `next`, the list of keys to insert before that key in
    // the combined list


    var nextKeysPending = Object.create(null);
    var pendingKeys = [];

    for (var prevKey in prev) {
      if (prevKey in next) {
        if (pendingKeys.length) {
          nextKeysPending[prevKey] = pendingKeys;
          pendingKeys = [];
        }
      } else {
        pendingKeys.push(prevKey);
      }
    }

    var i;
    var childMapping = {};

    for (var nextKey in next) {
      if (nextKeysPending[nextKey]) {
        for (i = 0; i < nextKeysPending[nextKey].length; i++) {
          var pendingNextKey = nextKeysPending[nextKey][i];
          childMapping[nextKeysPending[nextKey][i]] = getValueForKey(pendingNextKey);
        }
      }

      childMapping[nextKey] = getValueForKey(nextKey);
    } // Finally, add the keys which didn't appear before any key in `next`


    for (i = 0; i < pendingKeys.length; i++) {
      childMapping[pendingKeys[i]] = getValueForKey(pendingKeys[i]);
    }

    return childMapping;
  }

  function getProp(child, prop, props) {
    return props[prop] != null ? props[prop] : child.props[prop];
  }

  function getInitialChildMapping(props, onExited) {
    return getChildMapping(props.children, function (child) {
      return React.cloneElement(child, {
        onExited: onExited.bind(null, child),
        in: true,
        appear: getProp(child, 'appear', props),
        enter: getProp(child, 'enter', props),
        exit: getProp(child, 'exit', props)
      });
    });
  }
  function getNextChildMapping(nextProps, prevChildMapping, onExited) {
    var nextChildMapping = getChildMapping(nextProps.children);
    var children = mergeChildMappings(prevChildMapping, nextChildMapping);
    Object.keys(children).forEach(function (key) {
      var child = children[key];
      if (!React.isValidElement(child)) return;
      var hasPrev = (key in prevChildMapping);
      var hasNext = (key in nextChildMapping);
      var prevChild = prevChildMapping[key];
      var isLeaving = React.isValidElement(prevChild) && !prevChild.props.in; // item is new (entering)

      if (hasNext && (!hasPrev || isLeaving)) {
        // console.log('entering', key)
        children[key] = React.cloneElement(child, {
          onExited: onExited.bind(null, child),
          in: true,
          exit: getProp(child, 'exit', nextProps),
          enter: getProp(child, 'enter', nextProps)
        });
      } else if (!hasNext && hasPrev && !isLeaving) {
        // item is old (exiting)
        // console.log('leaving', key)
        children[key] = React.cloneElement(child, {
          in: false
        });
      } else if (hasNext && hasPrev && React.isValidElement(prevChild)) {
        // item hasn't changed transition states
        // copy over the last transition props;
        // console.log('unchanged', key)
        children[key] = React.cloneElement(child, {
          onExited: onExited.bind(null, child),
          in: prevChild.props.in,
          exit: getProp(child, 'exit', nextProps),
          enter: getProp(child, 'enter', nextProps)
        });
      }
    });
    return children;
  }

  var values = Object.values || function (obj) {
    return Object.keys(obj).map(function (k) {
      return obj[k];
    });
  };

  var defaultProps = {
    component: 'div',
    childFactory: function childFactory(child) {
      return child;
    }
  };
  /**
   * The `<TransitionGroup>` component manages a set of transition components
   * (`<Transition>` and `<CSSTransition>`) in a list. Like with the transition
   * components, `<TransitionGroup>` is a state machine for managing the mounting
   * and unmounting of components over time.
   *
   * Consider the example below. As items are removed or added to the TodoList the
   * `in` prop is toggled automatically by the `<TransitionGroup>`.
   *
   * Note that `<TransitionGroup>`  does not define any animation behavior!
   * Exactly _how_ a list item animates is up to the individual transition
   * component. This means you can mix and match animations across different list
   * items.
   */

  var TransitionGroup = /*#__PURE__*/function (_React$Component) {
    _inheritsLoose(TransitionGroup, _React$Component);

    function TransitionGroup(props, context) {
      var _this;

      _this = _React$Component.call(this, props, context) || this;

      var handleExited = _this.handleExited.bind(_assertThisInitialized(_this)); // Initial children should all be entering, dependent on appear


      _this.state = {
        contextValue: {
          isMounting: true
        },
        handleExited: handleExited,
        firstRender: true
      };
      return _this;
    }

    var _proto = TransitionGroup.prototype;

    _proto.componentDidMount = function componentDidMount() {
      this.mounted = true;
      this.setState({
        contextValue: {
          isMounting: false
        }
      });
    };

    _proto.componentWillUnmount = function componentWillUnmount() {
      this.mounted = false;
    };

    TransitionGroup.getDerivedStateFromProps = function getDerivedStateFromProps(nextProps, _ref) {
      var prevChildMapping = _ref.children,
          handleExited = _ref.handleExited,
          firstRender = _ref.firstRender;
      return {
        children: firstRender ? getInitialChildMapping(nextProps, handleExited) : getNextChildMapping(nextProps, prevChildMapping, handleExited),
        firstRender: false
      };
    } // node is `undefined` when user provided `nodeRef` prop
    ;

    _proto.handleExited = function handleExited(child, node) {
      var currentChildMapping = getChildMapping(this.props.children);
      if (child.key in currentChildMapping) return;

      if (child.props.onExited) {
        child.props.onExited(node);
      }

      if (this.mounted) {
        this.setState(function (state) {
          var children = _extends({}, state.children);

          delete children[child.key];
          return {
            children: children
          };
        });
      }
    };

    _proto.render = function render() {
      var _this$props = this.props,
          Component = _this$props.component,
          childFactory = _this$props.childFactory,
          props = _objectWithoutPropertiesLoose(_this$props, ["component", "childFactory"]);

      var contextValue = this.state.contextValue;
      var children = values(this.state.children).map(childFactory);
      delete props.appear;
      delete props.enter;
      delete props.exit;

      if (Component === null) {
        return /*#__PURE__*/React__default.createElement(TransitionGroupContext.Provider, {
          value: contextValue
        }, children);
      }

      return /*#__PURE__*/React__default.createElement(TransitionGroupContext.Provider, {
        value: contextValue
      }, /*#__PURE__*/React__default.createElement(Component, props, children));
    };

    return TransitionGroup;
  }(React__default.Component);

  TransitionGroup.propTypes =  {
    /**
     * `<TransitionGroup>` renders a `<div>` by default. You can change this
     * behavior by providing a `component` prop.
     * If you use React v16+ and would like to avoid a wrapping `<div>` element
     * you can pass in `component={null}`. This is useful if the wrapping div
     * borks your css styles.
     */
    component: propTypes.any,

    /**
     * A set of `<Transition>` components, that are toggled `in` and out as they
     * leave. the `<TransitionGroup>` will inject specific transition props, so
     * remember to spread them through if you are wrapping the `<Transition>` as
     * with our `<Fade>` example.
     *
     * While this component is meant for multiple `Transition` or `CSSTransition`
     * children, sometimes you may want to have a single transition child with
     * content that you want to be transitioned out and in when you change it
     * (e.g. routes, images etc.) In that case you can change the `key` prop of
     * the transition child as you change its content, this will cause
     * `TransitionGroup` to transition the child out and back in.
     */
    children: propTypes.node,

    /**
     * A convenience prop that enables or disables appear animations
     * for all children. Note that specifying this will override any defaults set
     * on individual children Transitions.
     */
    appear: propTypes.bool,

    /**
     * A convenience prop that enables or disables enter animations
     * for all children. Note that specifying this will override any defaults set
     * on individual children Transitions.
     */
    enter: propTypes.bool,

    /**
     * A convenience prop that enables or disables exit animations
     * for all children. Note that specifying this will override any defaults set
     * on individual children Transitions.
     */
    exit: propTypes.bool,

    /**
     * You may need to apply reactive updates to a child as it is exiting.
     * This is generally done by using `cloneElement` however in the case of an exiting
     * child the element has already been removed and not accessible to the consumer.
     *
     * If you do need to update a child as it leaves you can provide a `childFactory`
     * to wrap every child, even the ones that are leaving.
     *
     * @type Function(child: ReactElement) -> ReactElement
     */
    childFactory: propTypes.func
  } ;
  TransitionGroup.defaultProps = defaultProps;

  /**
   * The `<ReplaceTransition>` component is a specialized `Transition` component
   * that animates between two children.
   *
   * ```jsx
   * <ReplaceTransition in>
   *   <Fade><div>I appear first</div></Fade>
   *   <Fade><div>I replace the above</div></Fade>
   * </ReplaceTransition>
   * ```
   */

  var ReplaceTransition = /*#__PURE__*/function (_React$Component) {
    _inheritsLoose(ReplaceTransition, _React$Component);

    function ReplaceTransition() {
      var _this;

      for (var _len = arguments.length, _args = new Array(_len), _key = 0; _key < _len; _key++) {
        _args[_key] = arguments[_key];
      }

      _this = _React$Component.call.apply(_React$Component, [this].concat(_args)) || this;

      _this.handleEnter = function () {
        for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
          args[_key2] = arguments[_key2];
        }

        return _this.handleLifecycle('onEnter', 0, args);
      };

      _this.handleEntering = function () {
        for (var _len3 = arguments.length, args = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
          args[_key3] = arguments[_key3];
        }

        return _this.handleLifecycle('onEntering', 0, args);
      };

      _this.handleEntered = function () {
        for (var _len4 = arguments.length, args = new Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
          args[_key4] = arguments[_key4];
        }

        return _this.handleLifecycle('onEntered', 0, args);
      };

      _this.handleExit = function () {
        for (var _len5 = arguments.length, args = new Array(_len5), _key5 = 0; _key5 < _len5; _key5++) {
          args[_key5] = arguments[_key5];
        }

        return _this.handleLifecycle('onExit', 1, args);
      };

      _this.handleExiting = function () {
        for (var _len6 = arguments.length, args = new Array(_len6), _key6 = 0; _key6 < _len6; _key6++) {
          args[_key6] = arguments[_key6];
        }

        return _this.handleLifecycle('onExiting', 1, args);
      };

      _this.handleExited = function () {
        for (var _len7 = arguments.length, args = new Array(_len7), _key7 = 0; _key7 < _len7; _key7++) {
          args[_key7] = arguments[_key7];
        }

        return _this.handleLifecycle('onExited', 1, args);
      };

      return _this;
    }

    var _proto = ReplaceTransition.prototype;

    _proto.handleLifecycle = function handleLifecycle(handler, idx, originalArgs) {
      var _child$props;

      var children = this.props.children;
      var child = React__default.Children.toArray(children)[idx];
      if (child.props[handler]) (_child$props = child.props)[handler].apply(_child$props, originalArgs);

      if (this.props[handler]) {
        var maybeNode = child.props.nodeRef ? undefined : ReactDOM.findDOMNode(this);
        this.props[handler](maybeNode);
      }
    };

    _proto.render = function render() {
      var _this$props = this.props,
          children = _this$props.children,
          inProp = _this$props.in,
          props = _objectWithoutPropertiesLoose(_this$props, ["children", "in"]);

      var _React$Children$toArr = React__default.Children.toArray(children),
          first = _React$Children$toArr[0],
          second = _React$Children$toArr[1];

      delete props.onEnter;
      delete props.onEntering;
      delete props.onEntered;
      delete props.onExit;
      delete props.onExiting;
      delete props.onExited;
      return /*#__PURE__*/React__default.createElement(TransitionGroup, props, inProp ? React__default.cloneElement(first, {
        key: 'first',
        onEnter: this.handleEnter,
        onEntering: this.handleEntering,
        onEntered: this.handleEntered
      }) : React__default.cloneElement(second, {
        key: 'second',
        onEnter: this.handleExit,
        onEntering: this.handleExiting,
        onEntered: this.handleExited
      }));
    };

    return ReplaceTransition;
  }(React__default.Component);

  ReplaceTransition.propTypes =  {
    in: propTypes.bool.isRequired,
    children: function children(props, propName) {
      if (React__default.Children.count(props[propName]) !== 2) return new Error("\"" + propName + "\" must be exactly two transition components.");
      return null;
    }
  } ;

  var _leaveRenders, _enterRenders;

  function areChildrenDifferent(oldChildren, newChildren) {
    if (oldChildren === newChildren) return false;

    if (React__default.isValidElement(oldChildren) && React__default.isValidElement(newChildren) && oldChildren.key != null && oldChildren.key === newChildren.key) {
      return false;
    }

    return true;
  }
  /**
   * Enum of modes for SwitchTransition component
   * @enum { string }
   */


  var modes = {
    out: 'out-in',
    in: 'in-out'
  };

  var callHook = function callHook(element, name, cb) {
    return function () {
      var _element$props;

      element.props[name] && (_element$props = element.props)[name].apply(_element$props, arguments);
      cb();
    };
  };

  var leaveRenders = (_leaveRenders = {}, _leaveRenders[modes.out] = function (_ref) {
    var current = _ref.current,
        changeState = _ref.changeState;
    return React__default.cloneElement(current, {
      in: false,
      onExited: callHook(current, 'onExited', function () {
        changeState(ENTERING, null);
      })
    });
  }, _leaveRenders[modes.in] = function (_ref2) {
    var current = _ref2.current,
        changeState = _ref2.changeState,
        children = _ref2.children;
    return [current, React__default.cloneElement(children, {
      in: true,
      onEntered: callHook(children, 'onEntered', function () {
        changeState(ENTERING);
      })
    })];
  }, _leaveRenders);
  var enterRenders = (_enterRenders = {}, _enterRenders[modes.out] = function (_ref3) {
    var children = _ref3.children,
        changeState = _ref3.changeState;
    return React__default.cloneElement(children, {
      in: true,
      onEntered: callHook(children, 'onEntered', function () {
        changeState(ENTERED, React__default.cloneElement(children, {
          in: true
        }));
      })
    });
  }, _enterRenders[modes.in] = function (_ref4) {
    var current = _ref4.current,
        children = _ref4.children,
        changeState = _ref4.changeState;
    return [React__default.cloneElement(current, {
      in: false,
      onExited: callHook(current, 'onExited', function () {
        changeState(ENTERED, React__default.cloneElement(children, {
          in: true
        }));
      })
    }), React__default.cloneElement(children, {
      in: true
    })];
  }, _enterRenders);
  /**
   * A transition component inspired by the [vue transition modes](https://vuejs.org/v2/guide/transitions.html#Transition-Modes).
   * You can use it when you want to control the render between state transitions.
   * Based on the selected mode and the child's key which is the `Transition` or `CSSTransition` component, the `SwitchTransition` makes a consistent transition between them.
   *
   * If the `out-in` mode is selected, the `SwitchTransition` waits until the old child leaves and then inserts a new child.
   * If the `in-out` mode is selected, the `SwitchTransition` inserts a new child first, waits for the new child to enter and then removes the old child.
   *
   * **Note**: If you want the animation to happen simultaneously
   * (that is, to have the old child removed and a new child inserted **at the same time**),
   * you should use
   * [`TransitionGroup`](https://reactcommunity.org/react-transition-group/transition-group)
   * instead.
   *
   * ```jsx
   * function App() {
   *  const [state, setState] = useState(false);
   *  return (
   *    <SwitchTransition>
   *      <CSSTransition
   *        key={state ? "Goodbye, world!" : "Hello, world!"}
   *        addEndListener={(node, done) => node.addEventListener("transitionend", done, false)}
   *        classNames='fade'
   *      >
   *        <button onClick={() => setState(state => !state)}>
   *          {state ? "Goodbye, world!" : "Hello, world!"}
   *        </button>
   *      </CSSTransition>
   *    </SwitchTransition>
   *  );
   * }
   * ```
   *
   * ```css
   * .fade-enter{
   *    opacity: 0;
   * }
   * .fade-exit{
   *    opacity: 1;
   * }
   * .fade-enter-active{
   *    opacity: 1;
   * }
   * .fade-exit-active{
   *    opacity: 0;
   * }
   * .fade-enter-active,
   * .fade-exit-active{
   *    transition: opacity 500ms;
   * }
   * ```
   */

  var SwitchTransition = /*#__PURE__*/function (_React$Component) {
    _inheritsLoose(SwitchTransition, _React$Component);

    function SwitchTransition() {
      var _this;

      for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
        args[_key] = arguments[_key];
      }

      _this = _React$Component.call.apply(_React$Component, [this].concat(args)) || this;
      _this.state = {
        status: ENTERED,
        current: null
      };
      _this.appeared = false;

      _this.changeState = function (status, current) {
        if (current === void 0) {
          current = _this.state.current;
        }

        _this.setState({
          status: status,
          current: current
        });
      };

      return _this;
    }

    var _proto = SwitchTransition.prototype;

    _proto.componentDidMount = function componentDidMount() {
      this.appeared = true;
    };

    SwitchTransition.getDerivedStateFromProps = function getDerivedStateFromProps(props, state) {
      if (props.children == null) {
        return {
          current: null
        };
      }

      if (state.status === ENTERING && props.mode === modes.in) {
        return {
          status: ENTERING
        };
      }

      if (state.current && areChildrenDifferent(state.current, props.children)) {
        return {
          status: EXITING
        };
      }

      return {
        current: React__default.cloneElement(props.children, {
          in: true
        })
      };
    };

    _proto.render = function render() {
      var _this$props = this.props,
          children = _this$props.children,
          mode = _this$props.mode,
          _this$state = this.state,
          status = _this$state.status,
          current = _this$state.current;
      var data = {
        children: children,
        current: current,
        changeState: this.changeState,
        status: status
      };
      var component;

      switch (status) {
        case ENTERING:
          component = enterRenders[mode](data);
          break;

        case EXITING:
          component = leaveRenders[mode](data);
          break;

        case ENTERED:
          component = current;
      }

      return /*#__PURE__*/React__default.createElement(TransitionGroupContext.Provider, {
        value: {
          isMounting: !this.appeared
        }
      }, component);
    };

    return SwitchTransition;
  }(React__default.Component);

  SwitchTransition.propTypes =  {
    /**
     * Transition modes.
     * `out-in`: Current element transitions out first, then when complete, the new element transitions in.
     * `in-out`: New element transitions in first, then when complete, the current element transitions out.
     *
     * @type {'out-in'|'in-out'}
     */
    mode: propTypes.oneOf([modes.in, modes.out]),

    /**
     * Any `Transition` or `CSSTransition` component.
     */
    children: propTypes.oneOfType([propTypes.element.isRequired])
  } ;
  SwitchTransition.defaultProps = {
    mode: modes.out
  };

  exports.CSSTransition = CSSTransition;
  exports.ReplaceTransition = ReplaceTransition;
  exports.SwitchTransition = SwitchTransition;
  exports.Transition = Transition;
  exports.TransitionGroup = TransitionGroup;
  exports.config = config;

  Object.defineProperty(exports, '__esModule', { value: true });

})));