webpack.config.prod.js

const webpack = require('webpack');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const Dotenv = require('dotenv-webpack');

process.env.NODE_ENV = 'production';

module.exports = {
  mode: 'production',
  target: 'web',
  devtool: 'source-map',
  entry: './src/index',
  output: {
    path: path.resolve(__dirname, 'build'),
    publicPath: '/',
    filename: 'bundle.js',
  },
  plugins: [
    new Dotenv(),
    new BundleAnalyzerPlugin({ analyzerMode: 'static' }),
    new MiniCssExtractPlugin({
      filename: '[name].[contentHash].css'
    }),
    new HtmlWebpackPlugin({
      favicon: 'src/favicon.ico',
      template: 'src/index.html',
      minify: {
        // see https://github.com/kangax/html-minifier#options-quick-reference
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      }
    }),
  ],
  module: {
    rules: [
      {
        test: /.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader', 'eslint-loader'],
      },
      {
        test: /.(css|scss)$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
              sourceMap: true
            }
          },
          {
            loader: "postcss-loader",
            options: {
              plugins: () => [require("cssnano")],
              sourceMap: true
            }
          },
          'sass-loader'
        ],
      },
      {
        test: /.(jpg|jpeg|png|gif|svg)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[path][name]-[hash:8].[ext]',
            },
          },
        ],
      },
    ],
  },
};