content: import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
  import _inheritsLoose from "@babel/runtime/helpers/esm/inheritsLoose";
  import PropTypes from 'prop-types';
  import React from 'react';
  import ReactDOM from 'react-dom';
  import config from './config';
  import { timeoutsShape } from './utils/PropTypes';
  import TransitionGroupContext from './TransitionGroupContext';
  export var UNMOUNTED = 'unmounted';
  export var EXITED = 'exited';
  export var ENTERING = 'entering';
  export var ENTERED = 'entered';
  export 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) {
          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.createElement(TransitionGroupContext.Provider, {
          value: null
        }, typeof children === 'function' ? children(status, childProps) : React.cloneElement(React.Children.only(children), childProps))
      );
    };
  
    return Transition;
  }(React.Component);
  
  Transition.contextType = TransitionGroupContext;
  Transition.propTypes = process.env.NODE_ENV !== "production" ? {
    /**
     * 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 : PropTypes.instanceOf(Element)
    }),
  
    /**
     * 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;
  export default Transition;