Babel-loader

lastmod 2022-04-07created 2022-04-071 edits

Setup

yarn add --dev webpack webpack-cli

Add babel-loader:

yarn add --dev babel-loader

In package.json, replace the Babel build with the webpack bundling command.

{
  "name": "es6-project",
  "version": "1.0.0",
  "scripts": {
    "build": "webpack -w"
  },
  "devDependencies": {
    "@babel/cli": "^7.7.0",
    "@babel/core": "^7.7.2",
    "@babel/plugin-proposal-class-properties": "^7.7.0",
    "@babel/preset-env": "^7.7.1",
    "babel-loader": "^8.0.6",
    "webpack": "^4.41.2",
    "webpack-cli": "^3.3.10"
  }
}

Edit webpack.config.js:

const path = require('path');

module.exports = {
  // enntry file
  entry: './src/js/main.js',
  // 컴파일 + 번들링된 js 파일이 저장될 경로와 이름 지정
  output: {
    path: path.resolve(__dirname, 'dist/js'),
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        include: [
          path.resolve(__dirname, 'src/js')
        ],
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: ['@babel/plugin-proposal-class-properties']
          }
        }
      }
    ]
  },
  devtool: 'source-map',
  // https://webpack.js.org/concepts/mode/#mode-development
  mode: 'development'
};

~~To use objects and methods newly added in ES6+ even in old browsers, add @babel/polyfill as a runtime dependency~~

WARNING
@babel/polyfill has been deprecated since Babel 7.4.0.

Babel-loader

Setup

See also