\n * \n * \n * \n *
\n * );\n * }\n * ```\n *\n * When the `in` prop is set to `true`, the child component will first receive\n * the class `example-enter`, then the `example-enter-active` will be added in\n * the next tick. `CSSTransition` [forces a\n * reflow](https://github.com/reactjs/react-transition-group/blob/5007303e729a74be66a21c3e2205e4916821524b/src/CSSTransition.js#L208-L215)\n * between before adding the `example-enter-active`. This is an important trick\n * because it allows us to transition between `example-enter` and\n * `example-enter-active` even though they were added immediately one after\n * another. Most notably, this is what makes it possible for us to animate\n * _appearance_.\n *\n * ```css\n * .my-node-enter {\n * opacity: 0;\n * }\n * .my-node-enter-active {\n * opacity: 1;\n * transition: opacity 200ms;\n * }\n * .my-node-exit {\n * opacity: 1;\n * }\n * .my-node-exit-active {\n * opacity: 0;\n * transition: opacity 200ms;\n * }\n * ```\n *\n * `*-active` classes represent which styles you want to animate **to**, so it's\n * important to add `transition` declaration only to them, otherwise transitions\n * might not behave as intended! This might not be obvious when the transitions\n * are symmetrical, i.e. when `*-enter-active` is the same as `*-exit`, like in\n * the example above (minus `transition`), but it becomes apparent in more\n * complex transitions.\n *\n * **Note**: If you're using the\n * [`appear`](http://reactcommunity.org/react-transition-group/transition#Transition-prop-appear)\n * prop, make sure to define styles for `.appear-*` classes as well.\n */\n\n\nvar CSSTransition = /*#__PURE__*/function (_React$Component) {\n _inheritsLoose(CSSTransition, _React$Component);\n\n function CSSTransition() {\n var _this;\n\n for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n args[_key] = arguments[_key];\n }\n\n _this = _React$Component.call.apply(_React$Component, [this].concat(args)) || this;\n _this.appliedClasses = {\n appear: {},\n enter: {},\n exit: {}\n };\n\n _this.onEnter = function (maybeNode, maybeAppearing) {\n var _this$resolveArgument = _this.resolveArguments(maybeNode, maybeAppearing),\n node = _this$resolveArgument[0],\n appearing = _this$resolveArgument[1];\n\n _this.removeClasses(node, 'exit');\n\n _this.addClass(node, appearing ? 'appear' : 'enter', 'base');\n\n if (_this.props.onEnter) {\n _this.props.onEnter(maybeNode, maybeAppearing);\n }\n };\n\n _this.onEntering = function (maybeNode, maybeAppearing) {\n var _this$resolveArgument2 = _this.resolveArguments(maybeNode, maybeAppearing),\n node = _this$resolveArgument2[0],\n appearing = _this$resolveArgument2[1];\n\n var type = appearing ? 'appear' : 'enter';\n\n _this.addClass(node, type, 'active');\n\n if (_this.props.onEntering) {\n _this.props.onEntering(maybeNode, maybeAppearing);\n }\n };\n\n _this.onEntered = function (maybeNode, maybeAppearing) {\n var _this$resolveArgument3 = _this.resolveArguments(maybeNode, maybeAppearing),\n node = _this$resolveArgument3[0],\n appearing = _this$resolveArgument3[1];\n\n var type = appearing ? 'appear' : 'enter';\n\n _this.removeClasses(node, type);\n\n _this.addClass(node, type, 'done');\n\n if (_this.props.onEntered) {\n _this.props.onEntered(maybeNode, maybeAppearing);\n }\n };\n\n _this.onExit = function (maybeNode) {\n var _this$resolveArgument4 = _this.resolveArguments(maybeNode),\n node = _this$resolveArgument4[0];\n\n _this.removeClasses(node, 'appear');\n\n _this.removeClasses(node, 'enter');\n\n _this.addClass(node, 'exit', 'base');\n\n if (_this.props.onExit) {\n _this.props.onExit(maybeNode);\n }\n };\n\n _this.onExiting = function (maybeNode) {\n var _this$resolveArgument5 = _this.resolveArguments(maybeNode),\n node = _this$resolveArgument5[0];\n\n _this.addClass(node, 'exit', 'active');\n\n if (_this.props.onExiting) {\n _this.props.onExiting(maybeNode);\n }\n };\n\n _this.onExited = function (maybeNode) {\n var _this$resolveArgument6 = _this.resolveArguments(maybeNode),\n node = _this$resolveArgument6[0];\n\n _this.removeClasses(node, 'exit');\n\n _this.addClass(node, 'exit', 'done');\n\n if (_this.props.onExited) {\n _this.props.onExited(maybeNode);\n }\n };\n\n _this.resolveArguments = function (maybeNode, maybeAppearing) {\n return _this.props.nodeRef ? [_this.props.nodeRef.current, maybeNode] // here `maybeNode` is actually `appearing`\n : [maybeNode, maybeAppearing];\n };\n\n _this.getClassNames = function (type) {\n var classNames = _this.props.classNames;\n var isStringClassNames = typeof classNames === 'string';\n var prefix = isStringClassNames && classNames ? classNames + \"-\" : '';\n var baseClassName = isStringClassNames ? \"\" + prefix + type : classNames[type];\n var activeClassName = isStringClassNames ? baseClassName + \"-active\" : classNames[type + \"Active\"];\n var doneClassName = isStringClassNames ? baseClassName + \"-done\" : classNames[type + \"Done\"];\n return {\n baseClassName: baseClassName,\n activeClassName: activeClassName,\n doneClassName: doneClassName\n };\n };\n\n return _this;\n }\n\n var _proto = CSSTransition.prototype;\n\n _proto.addClass = function addClass(node, type, phase) {\n var className = this.getClassNames(type)[phase + \"ClassName\"];\n\n var _this$getClassNames = this.getClassNames('enter'),\n doneClassName = _this$getClassNames.doneClassName;\n\n if (type === 'appear' && phase === 'done' && doneClassName) {\n className += \" \" + doneClassName;\n } // This is to force a repaint,\n // which is necessary in order to transition styles when adding a class name.\n\n\n if (phase === 'active') {\n if (node) forceReflow(node);\n }\n\n if (className) {\n this.appliedClasses[type][phase] = className;\n\n _addClass(node, className);\n }\n };\n\n _proto.removeClasses = function removeClasses(node, type) {\n var _this$appliedClasses$ = this.appliedClasses[type],\n baseClassName = _this$appliedClasses$.base,\n activeClassName = _this$appliedClasses$.active,\n doneClassName = _this$appliedClasses$.done;\n this.appliedClasses[type] = {};\n\n if (baseClassName) {\n removeClass(node, baseClassName);\n }\n\n if (activeClassName) {\n removeClass(node, activeClassName);\n }\n\n if (doneClassName) {\n removeClass(node, doneClassName);\n }\n };\n\n _proto.render = function render() {\n var _this$props = this.props,\n _ = _this$props.classNames,\n props = _objectWithoutPropertiesLoose(_this$props, [\"classNames\"]);\n\n return /*#__PURE__*/React.createElement(Transition, _extends({}, props, {\n onEnter: this.onEnter,\n onEntered: this.onEntered,\n onEntering: this.onEntering,\n onExit: this.onExit,\n onExiting: this.onExiting,\n onExited: this.onExited\n }));\n };\n\n return CSSTransition;\n}(React.Component);\n\nCSSTransition.defaultProps = {\n classNames: ''\n};\nCSSTransition.propTypes = process.env.NODE_ENV !== \"production\" ? _extends({}, Transition.propTypes, {\n /**\n * The animation classNames applied to the component as it appears, enters,\n * exits or has finished the transition. A single name can be provided, which\n * will be suffixed for each stage, e.g. `classNames=\"fade\"` applies:\n *\n * - `fade-appear`, `fade-appear-active`, `fade-appear-done`\n * - `fade-enter`, `fade-enter-active`, `fade-enter-done`\n * - `fade-exit`, `fade-exit-active`, `fade-exit-done`\n *\n * A few details to note about how these classes are applied:\n *\n * 1. They are _joined_ with the ones that are already defined on the child\n * component, so if you want to add some base styles, you can use\n * `className` without worrying that it will be overridden.\n *\n * 2. If the transition component mounts with `in={false}`, no classes are\n * applied yet. You might be expecting `*-exit-done`, but if you think\n * about it, a component cannot finish exiting if it hasn't entered yet.\n *\n * 2. `fade-appear-done` and `fade-enter-done` will _both_ be applied. This\n * allows you to define different behavior for when appearing is done and\n * when regular entering is done, using selectors like\n * `.fade-enter-done:not(.fade-appear-done)`. For example, you could apply\n * an epic entrance animation when element first appears in the DOM using\n * [Animate.css](https://daneden.github.io/animate.css/). Otherwise you can\n * simply use `fade-enter-done` for defining both cases.\n *\n * Each individual classNames can also be specified independently like:\n *\n * ```js\n * classNames={{\n * appear: 'my-appear',\n * appearActive: 'my-active-appear',\n * appearDone: 'my-done-appear',\n * enter: 'my-enter',\n * enterActive: 'my-active-enter',\n * enterDone: 'my-done-enter',\n * exit: 'my-exit',\n * exitActive: 'my-active-exit',\n * exitDone: 'my-done-exit',\n * }}\n * ```\n *\n * If you want to set these classes using CSS Modules:\n *\n * ```js\n * import styles from './styles.css';\n * ```\n *\n * you might want to use camelCase in your CSS file, that way could simply\n * spread them instead of listing them one by one:\n *\n * ```js\n * classNames={{ ...styles }}\n * ```\n *\n * @type {string | {\n * appear?: string,\n * appearActive?: string,\n * appearDone?: string,\n * enter?: string,\n * enterActive?: string,\n * enterDone?: string,\n * exit?: string,\n * exitActive?: string,\n * exitDone?: string,\n * }}\n */\n classNames: classNamesShape,\n\n /**\n * A `\n * {\"I'll receive my-node-* classes\"}\n *
\n *