webpack.config.js

const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const apiMocker = require("connect-api-mocker");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const TerserPlugin = require("terser-webpack-plugin");
const CopyPlugin = require("copy-webpack-plugin");

const mode = process.env.NODE_ENV || "development";

module.exports = {
  mode,
  entry: {
    main: "./src/app.js"
  },
  output: {
    filename: "[name].js",
    path: path.resolve("./dist")
  },
  devServer: {
    overlay: true,
    stats: "errors-only",
    // before: (app, server, compiler) => {
    //   app.use(apiMocker('/api', 'mocks/api'));
    // },
    proxy: {
      "/api": "http://localhost:8081"
    },
    hot: true
  },
  module: {
    rules: [
      {
        test: /\.(scss|css)$/,
        use: [
          mode === "production"
            ? MiniCssExtractPlugin.loader // 프로덕션 환경
            : "style-loader", // 개발 환경
          "css-loader",
          "sass-loader"
        ]
      },
      {
        test: /\.(png|jpg|svg|gif)$/,
        loader: "url-loader",
        options: {
          name: "[name].[ext]?[hash]",
          limit: 10000 // 10Kb
        }
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "babel-loader" // 바벨 로더를 추가한다
      }
    ]
  },
  plugins: [
    new webpack.BannerPlugin({
      banner: `빌드 날짜: ${new Date().toLocaleString()}`
    }),
    new webpack.DefinePlugin({}),
    new HtmlWebpackPlugin({
      template: "./src/index.html",
      templateParameters: {
        env: mode === "development" ? "(개발용)" : ""
      },
      minify:
        mode === "production"
          ? {
              collapseWhitespace: true, // 빈칸 제거
              removeComments: true // 주석 제거
            }
          : false,
      hash: mode === "production"
    }),
    new CleanWebpackPlugin(),
    new CopyPlugin([
      {
        from: "./node_modules/axios/dist/axios.min.js",
        to: "./axios.min.js" // 목적지 파일에 들어간다
      }
    ]),
    ...(mode === "production"
      ? [new MiniCssExtractPlugin({ filename: `[name].css` })]
      : [])
  ],
  optimization: {
    minimizer:
      mode === "production"
        ? [
            new OptimizeCSSAssetsPlugin(),
            new TerserPlugin({
              terserOptions: {
                compress: {
                  drop_console: true // 콘솔 로그를 제거한다
                }
              }
            })
          ]
        : []
  },
  externals: {
    axios: "axios"
  }
};