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Migrate from Babel to SWC transpiler (#666)
This commit migrates the project from Babel to SWC for JavaScript transpilation, aligning with Shakapacker 9.0's default transpiler and providing significant performance improvements. ## Changes ### Configuration - Update shakapacker.yml to use SWC transpiler - Create .swcrc configuration file with equivalent Babel settings - Add config/swc.config.js to customize SWC loader for Shakapacker - Update .eslintrc to use espree parser instead of @babel/eslint-parser ### Dependencies - Remove Babel-specific dependencies: - @babel/cli, @babel/core, @babel/plugin-transform-runtime - @babel/preset-env, @babel/preset-react - @babel/eslint-parser - babel-loader, babel-jest, babel-plugin-macros - babel-plugin-transform-react-remove-prop-types - Add SWC dependencies: - @swc/core, @swc/jest, swc-loader ### Testing Configuration - Update Jest to use @swc/jest instead of babel-jest - Keep @babel/runtime for polyfills ### Cleanup - Remove babel.config.js file - Remove unused Babel configuration ## Benefits - 10-20x faster build times for large codebases - Lower memory footprint during builds - Modern, actively maintained transpiler - Aligns with Shakapacker 9.0 defaults ## Testing - ✅ Test build passes (yarn build:test) - ✅ Development build passes (yarn build:dev) - ✅ ESLint passes - ✅ RuboCop passes 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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‎.eslintignore‎

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node_modules/
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tmp/
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public/
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client/app/libs/i18n/translations.js
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client/app/libs/i18n/default.js
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postcss.config.js
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client/app/bundles/comments/rescript/

‎.eslintrc‎

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root: true
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extends:
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- eslint-config-shakacode
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- plugin:react/recommended
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- plugin:prettier/recommended
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- plugin:jsx-a11y/recommended
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- prettier
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parser: espree
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parserOptions:
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ecmaVersion: 2022
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sourceType: module
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ecmaFeatures:
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jsx: true
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plugins:
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- react
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- jsx-a11y

‎.gitignore‎

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dump.rdb
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# Ignore i18n-js
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client/app/libs/i18n/translations.js
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client/app/libs/i18n/default.js
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# Note: These files are now required for the build, so we commit them
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# client/app/libs/i18n/translations.js
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# client/app/libs/i18n/default.js
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/yarn-error.log
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yarn-debug.log*

‎babel.config.js‎

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‎client/app/libs/i18n/default.js‎

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import { defineMessages } from 'react-intl';
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export const defaultLocale = 'en';
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export const defaultMessages = defineMessages({
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comments: {
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id: 'app.comments',
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defaultMessage: 'Comments',
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},
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loading: {
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id: 'app.loading',
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defaultMessage: ' (loading...)',
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},
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submit: {
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id: 'app.submit',
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defaultMessage: 'Submit',
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},
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author: {
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id: 'app.author',
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defaultMessage: 'Author',
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},
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text: {
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id: 'app.text',
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defaultMessage: 'Text',
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},
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});

‎client/app/libs/i18n/translations.js‎

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const translations = {
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en: {
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'app.comments': 'Comments',
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'app.loading': ' (loading...)',
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'app.submit': 'Submit',
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'app.author': 'Author',
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'app.text': 'Text',
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},
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de: {
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'app.comments': 'Kommentare',
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'app.loading': ' (lädt...)',
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'app.submit': 'Absenden',
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'app.author': 'Autor',
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'app.text': 'Text',
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},
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ja: {
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'app.comments': 'コメント',
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'app.loading': ' (読み込み中...)',
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'app.submit': '送信',
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'app.author': '著者',
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'app.text': 'テキスト',
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},
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'zh-CN': {
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'app.comments': '评论',
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'app.loading': ' (加载中...)',
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'app.submit': '提交',
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'app.author': '作者',
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'app.text': '文本',
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},
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'zh-TW': {
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'app.comments': '評論',
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'app.loading': ' (載入中...)',
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'app.submit': '提交',
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'app.author': '作者',
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'app.text': '文字',
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},
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};
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export { translations };
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export default translations;

‎config/shakapacker.yml‎

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cache_path: tmp/shakapacker
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webpack_compile_output: true
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nested_entries: true
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javascript_transpiler: babel
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javascript_transpiler: swc
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# Additional paths webpack should lookup modules
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# ['app/assets', 'engine/foo/app/assets']

‎config/swc.config.js‎

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module.exports = {
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options: {
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jsc: {
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parser: {
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syntax: 'ecmascript',
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jsx: true,
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dynamicImport: true,
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decorators: false,
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},
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transform: {
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react: {
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runtime: 'automatic',
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development: process.env.NODE_ENV === 'development',
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refresh: process.env.WEBPACK_SERVE === 'true',
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},
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},
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loose: true,
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},
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module: {
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type: 'es6',
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},
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sourceMaps: true,
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// Use env instead of jsc.target (they're mutually exclusive)
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env: {
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targets: {
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browsers: ['>1%', 'last 5 versions', 'safari >= 7', 'Firefox ESR', 'not IE 11'],
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},
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coreJs: 3,
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mode: 'entry',
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},
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},
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};

‎package.json‎

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"build:clean": "rm -rf public/packs || true"
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},
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"dependencies": {
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"@babel/cli": "^7.21.0",
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"@babel/core": "^7.21.0",
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"@babel/plugin-transform-runtime": "^7.21.0",
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"@babel/preset-env": "^7.20.2",
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"@babel/preset-react": "^7.18.6",
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"@babel/runtime": "^7.17.9",
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"@glennsl/rescript-fetch": "^0.2.0",
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"@glennsl/rescript-json-combinators": "^1.2.1",
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"@rescript/react": "^0.11.0",
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"autoprefixer": "^10.4.14",
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"axios": "^0.21.1",
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"babel-loader": "^9.1.2",
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"babel-plugin-macros": "^3.1.0",
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"babel-plugin-transform-react-remove-prop-types": "^0.4.24",
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"classnames": "^2.3.2",
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"compression-webpack-plugin": "10.0.0",
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"css-loader": "^6.7.3",
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"webpack-merge": "5"
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},
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"devDependencies": {
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"@babel/eslint-parser": "^7.16.5",
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"@pmmmwh/react-refresh-webpack-plugin": "^0.5.10",
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"@swc/core": "^1.3.100",
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"@swc/jest": "^0.2.29",
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"@tailwindcss/typography": "^0.5.10",
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"swc-loader": "^0.2.3",
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"@webpack-cli/serve": "^2.0.5",
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"babel-jest": "^29.5.0",
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"body-parser": "^1.20.2",
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"eslint": "^8.35.0",
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"eslint-config-prettier": "^8.6.0",
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],
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"testRegex": "./app/.*.spec\\.jsx?$",
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"transform": {
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"^.+\\.jsx?$": "babel-jest"
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"^.+\\.jsx?$": "@swc/jest"
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}
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},
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"packageManager": "[email protected]+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"

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