webpack.prod.js

const merge = require('webpack-merge')
const path = require('path')
const common = require('./webpack.common.js')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')
const TerserPlugin = require('terser-webpack-plugin')
// const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer')

module.exports = merge(common, {
  mode: 'production',
  // devtool: 'source-map',
  module: {
    rules: [
      {
        test: /\.s?[ac]ss$/i,
        exclude: /\.module\.s?[ac]ss$/i,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {},
          },
          {
            loader: 'sass-loader',
          },
        ],
      },
      {
        test: /\.module\.s?[ac]ss$/i,
        exclude: /\.css$/i,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              modules: true,
            },
          },
          {
            loader: 'sass-loader',
          },
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].css',
    }),
    new HtmlWebpackPlugin({
      filename: path.resolve(__dirname, 'index.html'),
      template: path.resolve(__dirname, 'docs/index.html'),
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true,
      },
    }),
    // new BundleAnalyzerPlugin(),
  ],
  output: {
    filename: '[name].[contenthash].js',
  },
  optimization: {
    moduleIds: 'hashed',
    runtimeChunk: 'single',
    splitChunks: {
      cacheGroups: {
        vendor: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          chunks: 'all',
        },
      },
    },
    minimize: true,
    minimizer: [new TerserPlugin({}), new OptimizeCSSAssetsPlugin({})],
  },
})