React 코드 스프리팅

1. 함수 스프리팅

A. 스프리팅을 사용안함 

src/App.js

import React, { Component } from 'react';
import notify from './notify';

class App extends Component {
  handleClick = () => {
    notify();
  };
  render() {
    return (
      <div>
        <button onClick={this.handleClick}>Click Me</button>
      </div>
    );
  }
}

export default App;

src/notify.js

function notify() {
  alert('종소리 울려라 종소리 울려~');
}

export default notify;

 

B. Dynamic Import를 이용한 함수 스프리팅

src/App.js

import React, { Component } from 'react';

class App extends Component {
  handleClick = () => {
    import('./notify').then(({ default: notify }) => {
      notify();
    });
  };
  render() {
    return (
      <div>
        <button onClick={this.handleClick}>Click Me</button>
      </div>
    );
  }
}

export default App;

 

src/notify.js

function notify() {
  alert('종소리 울려라 종소리 울려~');
}

export default notify;

 

2. 컴포넌트 스프리팅

src/App.js

import React, { Component } from 'react';

class App extends Component {
  state = {
    SplitMe: null
  };
  handleClick = () => {
    import('./SplitMe').then(({ default: SplitMe }) => {
      this.setState({
        SplitMe
      });
    });
  };
  render() {
    const { SplitMe } = this.state;
    return (
      <div>
        <button onClick={this.handleClick}>Click Me</button>
        {SplitMe && <SplitMe />}
      </div>
    );
  }
}

 

src/notify.js

import React from 'react';

const SplitMe = () => {
  return <div>날, 필요할때만 불러.</div>;
};

export default SplitMe;

3. HOC를 이용한 스프리팅

src/App.js

import React, { Component } from 'react';
import withSplitting from './withSplitting';

const SplitMe = withSplitting(() => import('./SplitMe'));

class App extends Component {
  state = {
    visible: false
  };
  handleClick = () => {
    this.setState({
      visible: true
    });
  };
  render() {
    const { visible } = this.state;
    return (
      <div>
        <button onClick={this.handleClick}>Click Me</button>
        {visible && <SplitMe />}
      </div>
    );
  }
}

export default App;

src/withSplitting.js

import React, { Component } from 'react';

const withSplitting = getComponent => {
  // 여기서 getComponent 는 () => import('./SplitMe') 의 형태로 함수가 전달되야합니다.
  class WithSplitting extends Component {
    state = {
      Splitted: null
    };

    constructor(props) {
      super(props);
      getComponent().then(({ default: Splitted }) => {
        this.setState({
          Splitted
        });
      });
    }

    render() {
      const { Splitted } = this.state;
      if (!Splitted) {
        return null;
      }
      return <Splitted {...this.props} />;
    }
  }

  return WithSplitting;
};

export default withSplitting;

https://velog.io/@velopert/react-code-splitting