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Edit File: TransitionGroup.js

import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import _extends from "@babel/runtime/helpers/esm/extends";
import _assertThisInitialized from "@babel/runtime/helpers/esm/assertThisInitialized";
import _inheritsLoose from "@babel/runtime/helpers/esm/inheritsLoose";
import PropTypes from 'prop-types';
import React from 'react';
import TransitionGroupContext from './TransitionGroupContext';
import { getChildMapping, getInitialChildMapping, getNextChildMapping } from './utils/ChildMapping';

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.createElement(TransitionGroupContext.Provider, {
        value: contextValue
      }, children);
    }

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

return TransitionGroup;
}(React.Component);

TransitionGroup.propTypes = process.env.NODE_ENV !== "production" ? {
  /**
   * `<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;
export default TransitionGroup;