webpack.prod.config.js

const { resolve } = 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 OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
require('dotenv').config();
// const BundleAnalyzerPlugin = require('webpack-bundle-analyzer')
//   .BundleAnalyzerPlugin;

// PUBLIC_PATH can be replaced with the pathname of the prod application
const PUBLIC_PATH = '/react-web-projects/';

module.exports = {
  mode: 'production',
  entry: {
    main: resolve(__dirname, 'src/index.js'),
  },
  output: {
    filename: 'static/js/[name].[contenthash:8].js',
    chunkFilename: 'static/js/[name].[contenthash:8].chunk.js',
    path: resolve(__dirname, 'build'),
    publicPath: PUBLIC_PATH,
  },
  module: {
    rules: [
      {
        test: /\.(css|scss|sass)$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              postcssOptions: {
                plugins: [['autoprefixer']],
              },
            },
          },
          'sass-loader',
        ],
      },
      {
        test: /\.m?js$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
            plugins: ['@babel/plugin-transform-runtime'],
            cacheDirectory: true,
          },
        },
      },
      {
        test: /\.(jpe?g|png|gif|bmp)$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: 'static/media/[name].[contenthash:8].[ext]',
        },
      },
      {
        test: /\.html$/,
        loader: 'html-loader',
      },
      {
        exclude: /\.(m?js|css|scss|sass|jpe?g|png|gif|json|html)$/,
        loader: 'file-loader',
        options: {
          name: 'static/media/[name].[contenthash:8].[ext]',
        },
      },
    ],
  },
  plugins: [
    // new BundleAnalyzerPlugin(),
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      title: 'React Web Projects',
      template: resolve(__dirname, 'public/index.html'),
      favicon: resolve(__dirname, 'public/favicon.ico'),
      publicPath: PUBLIC_PATH,
    }),
    new HtmlWebpackPlugin({
      inject: false,
      filename: '404.html',
      template: resolve(__dirname, 'public/404.html'),
      favicon: resolve(__dirname, 'public/favicon.ico'),
      publicPath: PUBLIC_PATH,
    }),
    new webpack.DefinePlugin({
      'process.env.PUBLIC_PATH': JSON.stringify(PUBLIC_PATH),
      'process.env.YOUTUBE_AIP_KEY': JSON.stringify(
        process.env.YOUTUBE_AIP_KEY
      ),
    }),
    new MiniCssExtractPlugin({
      filename: 'static/css/[name].[contenthash:8].css',
      chunkFilename: 'static/css/[name].[contenthash:8].chunk.css',
    }),
    new OptimizeCSSAssetsPlugin(),
  ],
  resolve: {
    alias: {
      '@': resolve(__dirname, 'src'),
    },
  },
  optimization: {
    splitChunks: {
      chunks: 'all',
      name: 'vendors',
    },
    runtimeChunk: {
      name: (entrypoint) => `runtimechunk~${entrypoint.name}`,
    },
  },
};