webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');

module.exports = {
  // entry file
  // https://webpack.js.org/configuration/entry-context/#entry
  entry: './src/js/components/main.js',
  // 번들링된 js 파일의 이름(filename)과 저장될 경로(path)를 지정
  // https://webpack.js.org/configuration/output/#outputpath
  // https://webpack.js.org/configuration/output/#outputfilename
  output: {
    path: path.resolve(__dirname, 'public'),
    filename: 'js/[name].bundle.js'
  },
  // https://webpack.js.org/configuration/module
  module: {
    rules: [
      {
        test: /\.s[ac]ss$/i,
        include: [path.resolve(__dirname, 'src/scss')],
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.js$/,
        include: [path.resolve(__dirname, 'src/js')],
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: [
              [
                '@babel/plugin-transform-runtime',
                {
                  // https://babeljs.io/docs/en/babel-plugin-transform-runtime#corejs
                  corejs: 3,
                  proposals: true
                }
              ]
            ]
          }
        }
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html'
    }),
    new CopyPlugin({
      patterns: [
        {
          from: path.join(__dirname, 'src/images'),
          to: path.join(__dirname, `public/images`)
        }
      ]
    })
  ],

  // https://webpack.js.org/configuration/dev-server
  devServer: {
    // https://webpack.js.org/configuration/dev-server/#devserverstatic
    static: {
      // https://webpack.js.org/configuration/dev-server/#directory
      directory: path.join(__dirname, 'public') //
    },
    // https://webpack.js.org/configuration/dev-server/#devserveropen
    open: true,
    // https://webpack.js.org/configuration/dev-server/#devserverport
    port: 'auto',
    // https://webpack.js.org/configuration/dev-server/#devserverproxy
    proxy: {
      '/': {
        target: 'http://localhost:3001/',
        pathRewrite: { '^/': '/' }
      }
    }
  },
  // 소스 맵(Source Map)은 디버깅을 위해 번들링된 파일과 번들링되기 이전의 소스 파일을 연결해주는 파일이다.
  devtool: 'source-map',
  // https://webpack.js.org/configuration/mode
  mode: 'development'
};