1. react-transition-group #

1.1 主要组件 #

组件 介绍
Transition 该组件与平台⽆关(不⼀定要结合CSS)
CSSTransition 结合CSS，比较常⽤
SwitchTransition 两个组件显⽰和隐藏切换时使⽤该组件
TransitionGroup 将多个动画组件包裹在其中，⼀般⽤于列表中元素的动画

1.2 安装 # 

npm install react-transition-group react-bootstrap bootstrap --save

2. Transition #

2.1 属性 #

属性名 类型 默认 含义
in boolean false 显示组件；触发进入或退出状态
children Function或element 必需 function可以使用子元素代替 React 元素。此函数使用当前转换状态(entering, entered, exiting,exited)调用,可用于将特定于上下文的属性应用于组件
timeout number 无 过渡的持续时间，以毫秒为单位

2.2 实现原理 # 

//第1次点击按钮 inProp从false变为true
exited=>entering=>entered
//第2次点击按钮 inProp从true变为false
entered=>exiting=>exited

2.3 src\index.js #

src\index.js

import React from 'react';
import ReactDOM from 'react-dom/client';
import 'bootstrap/dist/css/bootstrap.min.css';
import TransitionPage from './TransitionPage';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <TransitionPage />
);

2.4 TransitionPage/index.js #

src\TransitionPage\index.js

import { useState } from 'react';
import { Container, Button } from 'react-bootstrap';
import { Transition } from '../react-transition-group';
//动画的持续时间
const duration = 1000;
//默认样式
const defaultStyle = {
  opacity: 0,
  transition: `opacity ${duration}ms`
}
const transitionStyles = {
  entering: { opacity: 1 },//进入动画的展示状态
  entered: { opacity: 1 },//进入动画的最终状态
  exiting: { opacity: 0.1 },//离开动画的展示状态
  exited: { opacity: 0.1 }//离开动画的最终状态
}
function TransitionPage() {
  const [inProp, setInProp] = useState(false);
  return (
    <Container>
      <Transition in={inProp} timeout={duration}>
        {state => (
          <Button style={{ ...defaultStyle, ...transitionStyles[state] }}>
            {state}
          </Button>
        )}
      </Transition>
      <br />
      <button onClick={() => setInProp(!inProp)}>
        {inProp ? 'hide' : 'show'}
      </button>
    </Container>
  );
}
export default TransitionPage;

2.5 react-transition-group\index.js #

src\react-transition-group\index.js

export { default as Transition } from './Transition';

2.6 Transition.js #

src\react-transition-group\Transition.js

import React from 'react'

export const ENTERING = 'entering'//进入中
export const ENTERED = 'entered'//进入后
export const EXITING = 'exiting'//退出中
export const EXITED = 'exited'//退出后

class Transition extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      //过渡的状态
      status: this.props.in ? ENTERED : EXITED
    }
  }
  componentDidUpdate() {
    let { status } = this.state;
    console.log(status);
    //更新后当属性发生改变时更改状态
    if (this.props.in) {//in为true时执行进场动画
      if (status !== ENTERING && status !== ENTERED) {
        this.updateStatus(ENTERING)
      }
    } else {//in为false时执行离场动画
      if (status === ENTERING || status === ENTERED) {
        this.updateStatus(EXITING)
      }
    }
  }

  onTransitionEnd(timeout, callback) {
    if (timeout) {
      setTimeout(callback, timeout)
    }
  }

  performEnter() {
    const { timeout } = this.props
    this.setState({ status: ENTERING }, () => {
      this.onTransitionEnd(timeout, () => {
        this.setState({ status: ENTERED })
      })
    })
  }

  performExit() {
    const { timeout } = this.props
    this.setState({ status: EXITING }, () => {
      this.onTransitionEnd(timeout, () => {
        this.setState({ status: EXITED })
      })
    })
  }

  updateStatus(nextStatus) {
    if (nextStatus) {
      if (nextStatus === ENTERING) {
        this.performEnter()
      } else {
        this.performExit()
      }
    }
  }

  render() {
    const { children } = this.props
    const { status } = this.state
    return (
      children(status)
    )
  }
}

export default Transition

3. CSSTransition #

3.1 动画钩子 #

钩子名称 钩子含义
onEnter 进场动画开始执行时调用
onEntering 进场动画执行中调用
onEntered 进场动画执行完毕调用
onExit 退场动画开始执行时调用
onExiting 退场动画执行中时调用
onExited 退场动画执行完毕调用

3.2 classNames #

3.3 src\index.js #

src\index.js

import React from 'react';
import ReactDOM from 'react-dom/client';
import 'bootstrap/dist/css/bootstrap.min.css';
import TransitionPage from './TransitionPage';
+import CSSTransitionPage from './CSSTransitionPage';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
+ <CSSTransitionPage />
);

3.4 CSSTransitionPage\index.js #

src\CSSTransitionPage\index.js

import { useState } from 'react';
import { Container, Button } from 'react-bootstrap';
import { CSSTransition } from '../react-transition-group';
import './index.css'
const duration = 1000;
function CSSTransitionPage() {
  const [inProp, setInProp] = useState(false);
  return (
    <Container>
      <CSSTransition in={inProp} timeout={duration} classNames="fade">
        <Button className='fade'>
          fade
        </Button>
      </CSSTransition>
      <br />
      <button onClick={() => setInProp(!inProp)}>
        {inProp ? 'hide' : 'show'}
      </button>
    </Container>
  );
}
export default CSSTransitionPage;

3.4 CSSTransitionPage\index.css #

src\CSSTransitionPage\index.css

.fade {
  opacity: .1;
}

.fade.fade-enter {
  opacity: .1;
}

.fade.fade-enter-active {
  opacity: 1;
  transition: opacity 1000ms;
}

.fade.fade-enter-done {
  opacity: 1;
}

.fade.fade-exit {
  opacity: 1;
}

.fade.fade-exit-active {
  opacity: .1;
  transition: opacity 1000ms;
}

.fade.fade-exit-done {
  opacity: .1;
}

3.6 react-transition-group\index.js #

src\react-transition-group\index.js

export { default as Transition } from './Transition';
+export { default as CSSTransition } from './CSSTransition';

3.7 CSSTransition.js #

src\react-transition-group\CSSTransition.js

import React from 'react'
import Transition from './Transition'
function CSSTransition(props) {
  const getClassNames = (status) => {
    const { classNames } = props
    return {
      base: `${classNames}-${status}`,
      active: `${classNames}-${status}-active`,
      done: `${classNames}-${status}-done`
    }
  }
  const onEnter = (node) => {
    const exitClassNames = Object.values(getClassNames('exit'));//['fade-exit','fade-exit-active','fade-exit-done']
    reflowAndRemoveClass(node, exitClassNames)
    const enterClassName = getClassNames('enter').base;//fade-enter
    reflowAndAddClass(node, enterClassName)
  }
  const onEntering = (node) => {
    const enteringClassName = getClassNames('enter').active//fade-enter-active
    reflowAndAddClass(node, enteringClassName)
  }
  const onEntered = (node) => {
    const enteringClassName = getClassNames('enter').active//fade-enter-active
    const enterClassName = getClassNames('enter').base//fade-enter
    reflowAndRemoveClass(node, [enterClassName, enteringClassName])
    const enteredClassName = getClassNames('enter').done//fade-enter-done
    reflowAndAddClass(node, enteredClassName)
  }

  const onExit = (node) => {
    const enteredClassNames = Object.values(getClassNames('enter'))
    reflowAndRemoveClass(node, enteredClassNames)
    const exitClassName = getClassNames('exit').base
    reflowAndAddClass(node, exitClassName)
  }

  const onExiting = (node) => {
    const exitingClassName = getClassNames('exit').active
    reflowAndAddClass(node, exitingClassName, true)
  }
  const onExited = (node) => {
    const exitingClassName = getClassNames('exit').active
    const exitClassName = getClassNames('exit').base
    reflowAndRemoveClass(node, [exitClassName, exitingClassName])
    const exitedClassName = getClassNames('exit').done
    reflowAndAddClass(node, exitedClassName)
  }
  return (
    <Transition
      onEnter={onEnter}
      onEntering={onEntering}
      onEntered={onEntered}
      onExit={onExit}
      onExiting={onExiting}
      onExited={onExited}
      in={props.in}
      timeout={props.timeout}
    >
      {props.children}
    </Transition>
  )
}
export default CSSTransition;

function reflowAndAddClass(node, classes) {
  node.offsetWidth && (Array.isArray(classes) ? classes : [classes]).forEach((className) => node.classList.add(className))
}
function reflowAndRemoveClass(node, classes) {
  node.offsetWidth && (Array.isArray(classes) ? classes : [classes]).forEach((className) => node.classList.remove(className))
}

3.8 Transition.js #

src\react-transition-group\Transition.js

import React from 'react'
+import ReactDOM from 'react-dom';
export const ENTERING = 'entering'//进入中
export const ENTERED = 'entered'//进入后
export const EXITING = 'exiting'//退出中
export const EXITED = 'exited'//退出后

class Transition extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      //过渡的状态
      status: this.props.in ? ENTERED : EXITED
    }
  }
  componentDidUpdate() {
    let { status } = this.state;
    console.log(status);
    //更新后当属性发生改变时更改状态
    if (this.props.in) {//in为true时执行进场动画
      if (status !== ENTERING && status !== ENTERED) {
        this.updateStatus(ENTERING)
      }
    } else {//in为false时执行离场动画
      if (status === ENTERING || status === ENTERED) {
        this.updateStatus(EXITING)
      }
    }
  }

  onTransitionEnd(timeout, callback) {
    if (timeout) {
      setTimeout(callback, timeout)
    }
  }

  performEnter() {
+   const { timeout, onEnter, onEntering, onEntered } = this.props
+   const node = ReactDOM.findDOMNode(this)
+   onEnter?.(node)
    this.setState({ status: ENTERING }, () => {
+     onEntering?.(node)
      this.onTransitionEnd(timeout, () => {
+       this.setState({ status: ENTERED }, () => onEntered?.(node))
      })
    })
  }

  performExit() {
+   const { timeout, onExit, onExiting, onExited } = this.props
+   const node = ReactDOM.findDOMNode(this)
+   onExit?.(node)
    this.setState({ status: EXITING }, () => {
+     onExiting?.(node)
      this.onTransitionEnd(timeout, () => {
+       this.setState({ status: EXITED }, () => onExited?.(node))
      })
    })
  }

  updateStatus(nextStatus) {
    if (nextStatus) {
      if (nextStatus === ENTERING) {
        this.performEnter()
      } else {
        this.performExit()
      }
    }
  }

  render() {
    const { children } = this.props
    const { status } = this.state
    return (
+      typeof children === 'function' ? children(status) : children
    )
  }
}
export default Transition

4. SwitchTransition #

4.1 实现原理 #

4.2 src\index.js #

src\index.js

import React from 'react';
import ReactDOM from 'react-dom/client';
import 'bootstrap/dist/css/bootstrap.min.css';
import TransitionPage from './TransitionPage';
import CSSTransitionPage from './CSSTransitionPage';
+import SwitchTransitionPage from './SwitchTransitionPage';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
+ <SwitchTransitionPage />
);

4.3 SwitchTransitionPage/index.js #

src\SwitchTransitionPage/index.js

import { useState } from 'react';
import { SwitchTransition, CSSTransition } from '../react-transition-group';
import './index.css'
function SwitchTransitionPage() {
  const [state, setState] = useState(true);
  const buttonStyle = { width: '200px', height: '80px', fontSize: '40px', border: 'none', backgroundColor: 'green', color: 'white' }
  return (
    <SwitchTransition>
      <CSSTransition
        key={state}
        timeout={2000}
        classNames="panel"
      >
        <button style={buttonStyle} onClick={() => setState((state) => !state)}>
          {state ? "A" : "B"}
        </button>
      </CSSTransition>
    </SwitchTransition>
  );
}
export default SwitchTransitionPage;

4.4 SwitchTransitionPage\index.css #

src\SwitchTransitionPage\index.css

.panel {
  opacity: 0;
}

.panel-enter {
  opacity: 0;
  transform: translateX(-100%);
}

.panel-enter-active {
  opacity: 1;
  transform: translateX(0%);
  transition: opacity 2000ms, transform 2000ms;
}

.panel-enter-done {
  opacity: 1;
}

.panel-exit {
  opacity: 1;
  transform: translateX(0%);
}

.panel-exit-active {
  opacity: 0;
  transform: translateX(100%);
  transition: opacity 2000ms, transform 2000ms;
}

.panel-exit-done {
  opacity: 0;
}

4.5 react-transition-group\index.js #

src\react-transition-group\index.js

export { default as Transition } from './Transition';
export { default as CSSTransition } from './CSSTransition';
+export { default as SwitchTransition } from './SwitchTransition';

4.7 SwitchTransition.js #

src\react-transition-group\SwitchTransition.js

import React, { isValidElement, Component } from 'react';
import { ENTERING, ENTERED, EXITING } from './Transition';
import TransitionGroupContext from './TransitionGroupContext';
class SwitchTransition extends Component {
  constructor(props) {
    super(props)
    this.state = {
      status: ENTERED,
      current: null,
    }
    this.mounted = false
  }
  componentDidMount() {
    this.mounted = true
  }
  static getDerivedStateFromProps(props, state) {
    if (state.current && areChildrenDifferent(state.current, props.children)) {
      return {
        status: EXITING
      }
    }
    return {
      current: React.cloneElement(props.children, { in: true })
    }
  }
  changeState = (status, current = this.state.current) => {
    this.setState({ status, current })
  }
  render() {
    const { status, current } = this.state;
    const { children } = this.props;
    let component
    switch (status) {
      case ENTERING:
        component = React.cloneElement(children, {
          in: true,
          onEntered: () => {
            this.changeState(ENTERED)
          }
        })
        break
      case EXITING:
        component = React.cloneElement(current, {
          in: false,
          onExited: () => {
            this.changeState(ENTERING, null)
          }
        })
        break
      case ENTERED:
        component = current
        break
    }
    return (
      <TransitionGroupContext.Provider value={{ status: this.mounted ? ENTERING : ENTERED }}>
        {component}
      </TransitionGroupContext.Provider>
    )
  }
}
function areChildrenDifferent(oldChildren, newChildren) {
  if (oldChildren === newChildren) return false;
  if (
    isValidElement(oldChildren) &&
    isValidElement(newChildren) &&
    oldChildren.key !== null &&
    oldChildren.key === newChildren.key
  ) {
    return false;
  }
  return true;
}
export default SwitchTransition;

4.8 CSSTransition.js #

src\react-transition-group\CSSTransition.js

import React from 'react'
import Transition from './Transition'
function CSSTransition(props) {
  const getClassNames = (status) => {
    const { classNames } = props
    return {
      base: `${classNames}-${status}`,
      active: `${classNames}-${status}-active`,
      done: `${classNames}-${status}-done`
    }
  }
  const onEnter = (node) => {
    const exitClassNames = Object.values(getClassNames('exit'));//['fade-exit','fade-exit-active','fade-exit-done']
    reflowAndRemoveClass(node, exitClassNames)
    const enterClassName = getClassNames('enter').base;//fade-enter
    reflowAndAddClass(node, enterClassName)
  }
  const onEntering = (node) => {
    const enteringClassName = getClassNames('enter').active//fade-enter-active
    reflowAndAddClass(node, enteringClassName)
  }
  const onEntered = (node) => {
    const enteringClassName = getClassNames('enter').active//fade-enter-active
    const enterClassName = getClassNames('enter').base//fade-enter
    reflowAndRemoveClass(node, [enterClassName, enteringClassName])
    const enteredClassName = getClassNames('enter').done//fade-enter-done
    reflowAndAddClass(node, enteredClassName)
+   props.onEntered?.(node)
  }

  const onExit = (node) => {
    const enteredClassNames = Object.values(getClassNames('enter'))
    reflowAndRemoveClass(node, enteredClassNames)
    const exitClassName = getClassNames('exit').base
    reflowAndAddClass(node, exitClassName)
  }

  const onExiting = (node) => {
    const exitingClassName = getClassNames('exit').active
    reflowAndAddClass(node, exitingClassName, true)
  }
  const onExited = (node) => {
    const exitingClassName = getClassNames('exit').active
    const exitClassName = getClassNames('exit').base
    reflowAndRemoveClass(node, [exitClassName, exitingClassName])
    const exitedClassName = getClassNames('exit').done
    reflowAndAddClass(node, exitedClassName)
+   props.onExited?.(node)
  }
  return (
    <Transition
      onEnter={onEnter}
      onEntering={onEntering}
      onEntered={onEntered}
      onExit={onExit}
      onExiting={onExiting}
      onExited={onExited}
      in={props.in}
      timeout={props.timeout}
    >
      {props.children}
    </Transition>
  )
}
export default CSSTransition;

function reflowAndAddClass(node, classes) {
  //强制浏览器重绘
  node.offsetLeft && (Array.isArray(classes) ? classes : [classes]).forEach((className) => node.classList.add(className))
}
function reflowAndRemoveClass(node, classes) {
  node.offsetLeft && (Array.isArray(classes) ? classes : [classes]).forEach((className) => node.classList.remove(className))
}

4.9 Transition.js #

src\react-transition-group\Transition.js

import React from 'react'
import ReactDOM from 'react-dom';
+import TransitionGroupContext from './TransitionGroupContext';
export const ENTERING = 'entering'//进入中
export const ENTERED = 'entered'//进入后
export const EXITING = 'exiting'//退出中
export const EXITED = 'exited'//退出后

class Transition extends React.Component {
+ static contextType = TransitionGroupContext
  constructor(props) {
    super(props)
    this.state = {
      //过渡的状态
      status: this.props.in ? ENTERED : EXITED
    }
  }
+ componentDidMount() {
+   if (this.context) {
+     const { status } = this.context
+     if (status === ENTERING) {
+       this.updateStatus(status)
+     }
+   }
+ }
  componentDidUpdate() {
    let { status } = this.state;
    //更新后当属性发生改变时更改状态
    if (this.props.in) {//in为true时执行进场动画
      if (status !== ENTERING && status !== ENTERED) {
        this.updateStatus(ENTERING)
      }
    } else {//in为false时执行离场动画
      if (status === ENTERING || status === ENTERED) {
        this.updateStatus(EXITING)
      }
    }
  }

  onTransitionEnd(timeout, callback) {
    if (timeout) {
      setTimeout(callback, timeout)
    }
  }

  performEnter() {
    const { timeout, onEnter, onEntering, onEntered } = this.props
    const node = ReactDOM.findDOMNode(this)
    onEnter?.(node)
    this.setState({ status: ENTERING }, () => {
      onEntering?.(node)
      this.onTransitionEnd(timeout, () => {
        this.setState({ status: ENTERED }, () => onEntered?.(node))
      })
    })
  }

  performExit() {
    const { timeout, onExit, onExiting, onExited } = this.props
    const node = ReactDOM.findDOMNode(this)
    onExit?.(node)
    this.setState({ status: EXITING }, () => {
      onExiting?.(node)
      this.onTransitionEnd(timeout, () => {
        this.setState({ status: EXITED }, () => onExited?.(node))
      })
    })
  }

  updateStatus(nextStatus) {
    if (nextStatus) {
      if (nextStatus === ENTERING) {
        this.performEnter()
      } else {
        this.performExit()
      }
    }
  }

  render() {
    const { children } = this.props
    const { status } = this.state
    return (
      typeof children === 'function' ? children(status) : children
    )
  }
}

export default Transition

4.10 TransitionGroupContext.js #

src\react-transition-group\TransitionGroupContext.js

import React from 'react';
export default React.createContext(null);

5. TransitionGroup #

5.1 原理 #

5.2 src\index.js #

src\index.js

import React from 'react';
import ReactDOM from 'react-dom/client';
import 'bootstrap/dist/css/bootstrap.min.css';
import TransitionPage from './TransitionPage';
import CSSTransitionPage from './CSSTransitionPage';
import SwitchTransitionPage from './SwitchTransitionPage';
+import TransitionGroupPage from './TransitionGroupPage';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
+ <TransitionGroupPage />
);

5.3 TransitionGroupPage\index.js #

src\TransitionGroupPage\index.js

import React, { useState } from 'react';
import { Container, ListGroup, Button, } from 'react-bootstrap';
import { CSSTransition, TransitionGroup, } from '../react-transition-group';
import './index.css';
function TransitionGroupPage() {
  const [items, setItems] = useState([
    { id: '1', text: '吃饭' },
    { id: '2', text: '睡觉' },
    { id: '3', text: '打豆豆' }
  ]);
  return (
    <Container>
      <ListGroup>
        <TransitionGroup>
          {items.map(({ id, text }) => (
            <CSSTransition
              key={id}
              timeout={1000}
              classNames="item"
            >
              <ListGroup.Item>
                <Button
                  style={{ marginRight: '10px' }}
                  onClick={() =>
                    setItems(items =>
                      items.filter(item => item.id !== id)
                    )
                  }
                >
                  &times;
                </Button>
                {text}
              </ListGroup.Item>
            </CSSTransition>
          ))}
        </TransitionGroup>
      </ListGroup>
      <Button
        onClick={() => {
          setItems(items => [
            ...items,
            { id: Date.now(), text: items.length },
          ]);
        }}
      >
        Add Item
      </Button>
    </Container>
  );
}

export default TransitionGroupPage;

5.4 TransitionGroupPage\index.css #

src\TransitionGroupPage\index.css

.item-enter {
  opacity: 0;
}

.item-enter-active {
  opacity: 1;
  transition: opacity 1000ms;
}

.item-exit {
  opacity: 1;
}

.item-exit-active {
  opacity: 0;
  transition: opacity 1000ms;
}

5.5 react-transition-group\index.js #

src\react-transition-group\index.js

export { default as Transition } from './Transition';
export { default as CSSTransition } from './CSSTransition';
export { default as SwitchTransition } from './SwitchTransition';
+export { default as TransitionGroup } from './TransitionGroup';

5.6 TransitionGroup.js #

src\react-transition-group\TransitionGroup.js

import React, { cloneElement } from 'react';
import TransitionGroupContext from './TransitionGroupContext';
import { ENTERING, ENTERED } from './Transition';
class TransitionGroup extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      children: {},
      status: ENTERED,
      firstRender: true,
      handleExited: this.handleExited
    };
  }
  static getDerivedStateFromProps(nextProps, { children, firstRender, handleExited }) {
    return {
      children: firstRender
        ? getInitialChildrenMapping(nextProps.children)
        : getNextChildrenMapping(nextProps, children, handleExited),
      firstRender: false
    };
  }

  componentDidMount() {
    this.setState({
      status: ENTERING
    });
  }

  handleExited = (child) => {
    this.setState((state) => {
      const children = { ...state.children };
      delete children[child.key];
      return { children };
    });
  }
  render() {
    const { children, status } = this.state;
    const component = Object.values(children);
    return (
      <TransitionGroupContext.Provider value={{ status }}>
        {component}
      </TransitionGroupContext.Provider>
    );
  }
}

export default TransitionGroup;
function getChildrenMapping(children, mapFn = (c) => c) {
  const result = Object.create(null);
  React.Children.forEach(children, (c) => {
    result[c.key] = mapFn(c);
  });
  return result;
}

function getInitialChildrenMapping(children) {
  return getChildrenMapping(children, (c) => cloneElement(c, { in: true }));
}

function mergeChildMappings(prev, next) {
  return Object.keys(prev).length > Object.keys(next).length ? prev : next;
}

function getNextChildrenMapping(nextProps, prevChildrenMapping, handleExited) {
  const result = Object.create(null);
  const nextChildrenMapping = getChildrenMapping(nextProps.children);
  const mergeMappings = mergeChildMappings(prevChildrenMapping, nextChildrenMapping);
  Object.keys(mergeMappings).forEach((key) => {
    const isNext = key in nextChildrenMapping;
    const isPrev = key in prevChildrenMapping;
    //老没有，新的有，新增元素
    if (!isPrev && isNext) {
      result[key] = React.cloneElement(nextChildrenMapping[key], { in: true });
    }
    //老的有，新的没有，先渲染老的，动画结束后删除元素
    if (isPrev && !isNext) {
      result[key] = React.cloneElement(prevChildrenMapping[key], {
        in: false,
        onExited() {
          handleExited(prevChildrenMapping[key]);
        },
      });
    }
    //新老都有，更新用新的
    if (isNext && isPrev) {
      result[key] = React.cloneElement(nextChildrenMapping[key], { in: true });
    }
  });
  return result;
}
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