webpack.config.js

const path = require('path');
const resolve = require('path').resolve;
const HtmlWebPackPlugin = require('html-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const webpack = require('webpack');
const CopyWebpackPlugin = require('copy-webpack-plugin');
// const ExtractTextPlugin = require('extract-text-webpack-plugin');
// const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const ROOT_DIR = path.resolve(__dirname);

const htmlPlugin = new HtmlWebPackPlugin({
  template: './src/index.html',
  filename: './index.html',
  inject: 'body',
  favicon: './src/favicon.png',
});

// const siteStyles = new ExtractTextPlugin('main.css');

module.exports = {
  entry: './src/index.jsx',
  output: {
    path: path.resolve('dist'),
    filename: 'main-[hash].js',
    chunkFilename: '[name]-[hash].js',
  },
  optimization: {
    minimizer: [
      new TerserPlugin({
        sourceMap: true,
        terserOptions: {
          compress: {
            inline: false,
          },
          output: {
            comments: false,
          },
        },
      }),
    ],
    namedChunks: true,
    runtimeChunk: false,
    splitChunks: {
      cacheGroups: {
        default: false,
        vendors: false,
        // vendor chunk
        vendor: {
          // async + async chunks
          chunks: 'all',
          // import file path containing node_modules
          test: /node_modules/,
          priority: 20,
          name: 'vendor',
        },
        // common chunk
        common: {
          name: 'common',
          minChunks: 2,
          chunks: 'async',
          priority: 10,
          reuseExistingChunk: true,
          enforce: true,
        },
      },
    },
  },
  resolve: {
    extensions: ['.js', '.jsx'],
    modules: [ROOT_DIR, 'node_modules'],
    alias: {
      // From mapbox-gl-js README. Required for non-browserify bundlers (e.g. webpack):
      'mapbox-gl$': resolve('./node_modules/mapbox-gl/dist/mapbox-gl.js'),
    },
  },
  devtool: 'inline-cheap-source-map',
  devServer: {
    contentBase: './dist',
    hot: true,
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['react'],
            },
          },
        ],
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.(png|jpe?g|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[path][name].[ext]',
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(),
    htmlPlugin,
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': '"production"',
    }),
    new CopyWebpackPlugin([
      {
        from: 'data/',
        to: 'data/',
      },
    ]),
    // new BundleAnalyzerPlugin()
  ],
};