webpack.config.prod.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CleanWebpackPlugin = require("clean-webpack-plugin");
const WebpackMd5Hash = require("webpack-md5-hash");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const OptimizeCssAssetsPlugin = require("optimize-css-assets-webpack-plugin");

module.exports = {
  mode: "production",
  devtool: "source-map",
  entry: {
    bundle: path.resolve(__dirname, "src/index")
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: "/",
    filename: "[name].[chunkhash].js"
  },
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        sourceMap: true
      }),
      new OptimizeCssAssetsPlugin({ cssProcessorOptions: { map: { inline: false, annotations: true } } })
    ]
  },
  plugins: [
    new WebpackMd5Hash(),
    new MiniCssExtractPlugin({
      filename: "style.[contenthash].css"
    }),
    new HtmlWebpackPlugin({
      inject: true,
      template: "src/index.html",
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      }
    }),
    new CleanWebpackPlugin("dist", {
      verbose: true
    }),
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /(\.css|\.scss|\.sass)$/,
        use: [
          "style-loader",
          {
            loader: MiniCssExtractPlugin.loader
          },
          {
            loader: "css-loader",
            options: {
              sourceMap: true
            }
          },
          {
            loader: "sass-loader",
            options: {
              sourceMap: true
            }
          }
        ]
      }
    ]
  }
}