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Webpack 5 샘플
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‎20211130/webpack/.eslintrc.js‎

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module.exports = {
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env: {
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browser: true,
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es2021: true,
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},
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extends: [
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'airbnb-base',
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'plugin:react/recommended',
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],
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parserOptions: {
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ecmaVersion: 13,
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sourceType: 'module',
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},
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rules: {
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indent: ['error', 2],
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'no-trailing-spaces': 'error',
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curly: 'error',
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'brace-style': 'error',
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'no-multi-spaces': 'error',
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'space-infix-ops': 'error',
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'space-unary-ops': 'error',
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'no-whitespace-before-property': 'error',
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'func-call-spacing': 'error',
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'space-before-blocks': 'error',
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'keyword-spacing': ['error', { before: true, after: true }],
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'comma-spacing': ['error', { before: false, after: true }],
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'comma-style': ['error', 'last'],
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'comma-dangle': ['error', 'always-multiline'],
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'space-in-parens': ['error', 'never'],
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'block-spacing': 'error',
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'array-bracket-spacing': ['error', 'never'],
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'object-curly-spacing': ['error', 'always'],
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'key-spacing': ['error', { mode: 'strict' }],
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'arrow-spacing': ['error', { before: true, after: true }],
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'import/no-extraneous-dependencies': ['error', {
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devDependencies: [
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'**/*.test.js',
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'**/*.test.jsx',
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'**/*.test.ts',
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'**/*.test.tsx',
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],
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}],
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'import/extensions': ['error', 'ignorePackages', {
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js: 'never',
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jsx: 'never',
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ts: 'never',
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tsx: 'never',
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}],
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'react/jsx-filename-extension': [2, {
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extensions: ['.js', '.jsx', '.ts', '.tsx'],
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}],
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},
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};

‎20211130/webpack/.vscode/settings.json‎

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{
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"editor.rulers": [
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80
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],
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"editor.codeActionsOnSave": {
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"source.fixAll.eslint": true
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},
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"trailing-spaces.trimOnSave": true,
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}

‎20211130/webpack/README.md‎

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# Webpack 5 샘플
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- <https://webpack.js.org/guides/getting-started/>
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- <https://webpack.js.org/guides/development/>
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- <https://webpack.js.org/loaders/babel-loader/>
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※ 주의할 점:
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`index.html` 파일의 위치가 `public` 폴더 아래로 바뀜.
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## Webpack 기본 세팅
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```bash
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npm init -y
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npm i -D webpack webpack-cli webpack-dev-server
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```
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`public/index.html` 파일 작성
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```bash
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mkdir -p public
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touch public/index.html
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```
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```html
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<!DOCTYPE html>
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<html lang="ko">
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<head>
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<meta charset="UTF-8">
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<title>Webpack Demo</title>
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</head>
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<body>
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<p>Hi!</p>
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</body>
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</html>
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```
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개발 서버 실행
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```bash
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npx webpack serve --mode=development
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```
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웹 브라우저에서 확인: <http://localhost:8080/>
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## JavaScript 파일 분리
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`src/index.js` 파일 작성
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```javascript
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const element = document.getElementById('app');
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element.innerHTML = `
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<p>Hello, world!</p>
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`;
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```
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`public/index.html` 파일 수정
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```html
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<!DOCTYPE html>
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<html lang="ko">
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<head>
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<meta charset="UTF-8">
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<title>Webpack Demo</title>
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</head>
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<body>
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<div id="app">
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Loading...
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</div>
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<script src="main.js"></script>
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</body>
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</html>
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```
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## Babel & JSX 세팅
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```bash
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npm i -D babel-loader @babel/core @babel/preset-env @babel/preset-react
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```
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`webpack.config.js` 파일 작성
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```javascript
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module.exports = {
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module: {
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rules: [
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{
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test: /\.jsx?$/,
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exclude: /node_modules/,
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use: {
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loader: 'babel-loader',
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options: {
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presets: ['@babel/preset-env', '@babel/preset-react'],
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},
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},
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},
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],
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},
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};
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```
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또는 `webpack.config.js`와 `babel.config.js` 파일을 분리할 수 있다.
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`webpack.config.js` 파일 작성
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```javascript
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module.exports = {
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module: {
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rules: [
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{
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test: /\.jsx?$/,
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exclude: /node_modules/,
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use: 'babel-loader',
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},
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],
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},
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};
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```
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`babel.config.js` 파일 작성
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```javascript
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module.exports = {
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presets: [
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'@babel/preset-env',
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'@babel/preset-react',
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],
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};
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```
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## ESLint 세팅
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“[JavaScript 프로젝트 시작하기](https://github.com/ahastudio/til/blob/main/javascript/20181212-setup-javascript-project.md)”
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문서 참고.
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```bash
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npm i -D eslint
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npx eslint --init
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```
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## Visual Studio Code 세팅
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`.vscode/settings.json` 파일 작성
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```bash
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mkdir -p .vscode
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touch .vscode/settings.json
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```
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```json
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{
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"editor.rulers": [
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80
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],
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"editor.codeActionsOnSave": {
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"source.fixAll.eslint": true
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},
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"trailing-spaces.trimOnSave": true,
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}
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```

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