webpack.prod.js

const path = require("path");
const common = require("./webpack.common");
const merge = require("webpack-merge");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-plugin");
const TerserPlugin = require("terser-webpack-plugin");

module.exports = merge(common, {
  mode: "production",
  devtool: "none",
  optimization: {
    minimizer: [new OptimizeCssAssetsWebpackPlugin(), new TerserPlugin()]
  },
  module: {
    rules: [
      {
        test: /\.s?css$/,
        use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"]
      }
    ]
  },
  output: {
    filename: "[name].[hash].bundle.js",
    path: path.resolve(__dirname, "dist")
  },
  plugins: [
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      filename: "[name].[hash].css"
    }),
    new HtmlWebpackPlugin({
      template: "./src/template.html",
      minify: {
        removeAttributeQuotes: true,
        collapseWhitespace: true,
        removeComments: true
      }
    })
  ]
});