webpack.config.js

const TerserPlugin = require('terser-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const path = require('path')

module.exports = {
  mode: 'production',
  entry: path.join(__dirname, 'src/index.js'),
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        use: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.(css|scss)$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          {
            loader: 'sass-loader',
            options: {
              sassOptions: {
                // Bootstrap is currently working on a version that does not create deprecation warnings. Once that version is released and updated,
                // these deprecations can be removed.
                silenceDeprecations: ['mixed-decls', 'color-functions', 'global-builtin', 'import']
              }
            }
          }
        ]
      },
      {
        test: /\.xml$/,
        use: ['raw-loader']
      }
    ]
  },
  resolve: {
    extensions: ['.js', '.jsx'],
    fallback: {
      buffer: false,
      stream: false
    }
  },
  devtool: 'source-map',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js',
    libraryTarget: 'commonjs2'
  },
  externals: {
    react: 'commonjs react',
    'react-dom': 'commonjs react-dom'
  },
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin({
      extractComments: false,
      terserOptions: {
        keep_classnames: true,
        keep_fnames: true
      }
    })]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'styles.css'
    })
  ]
}