webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
// const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  // mode: process.env.NODE_ENV,
  entry: './src/index.js',

  // Enable sourcemaps for debugging webpack's output.
  // devtool: 'source-map',
  devtool: 'cheap-module-source-map',

  output: {
    publicPath: '/',
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },

  devServer: {
    publicPath: '/',
    inline: true,
    hot: true,
    port: 3000,
    headers: {
      'Access-Control-Allow-Origin': '*',
    },
    // stats: 'errors-only',
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          priority: -10,
          test: /[\\/]node_modules[\\/]/,
        },
      },
      chunks: 'async',
      minChunks: 1,
      minSize: 30000,
      name: true,
    },
  },

  module: {
    rules: [
      {
        test: /\.jsx?/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
      {
        test: /.(css|scss)$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.(png|jpe?g|gif|svg)$/i,
        use: [
          {
            loader: 'file-loader',
          },
        ],
      },
      // {
      //   test: /\.(gif|png|jpe?g|svg)$/i,
      //   use: [
      //     'file-loader',
      //     {
      //       loader: 'image-webpack-loader',
      //       options: {
      //         mozjpeg: {
      //           progressive: true,
      //           quality: 65,
      //         },
      //         // optipng.enabled: false will disable optipng
      //         optipng: {
      //           enabled: false,
      //         },
      //         pngquant: {
      //           quality: [0.65, 0.90],
      //           speed: 4,
      //         },
      //         gifsicle: {
      //           interlaced: false,
      //         },
      //         // the webp option will enable WEBP
      //         webp: {
      //           quality: 75,
      //         },
      //       },
      //     },
      //   ],
      // },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: 'index.html',
      inject: true,
      favicon: './public/CMA-logo-no-text@0.75x.png',
    }),
    // new MiniCssExtractPlugin({
    //   filename: isDevelopment ? '[name].css' : '[name].[hash].css',
    //   chunkFilename: isDevelopment ? '[id].css' : '[id].[hash].css',
    // }),
  ],
};