webpack.config.prod.js

const path = require('path');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.js$/,
        use: [
          'babel-loader',
        ],
        exclude: /node_modules/,
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader',
        ],
      },
      {
        test: /\.(eot|svg|ttf|woff|woff2)$/,
        use: 'file-loader?name=public/fonts/[name].[ext]',
      },
    ],
  },
  entry: [
    path.resolve(__dirname, 'src/index.js'),
  ],
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'production.js',
    library: 'react-shopping-cart',
    libraryTarget: 'umd',
  },
  externals: {
    react: 'react',
    'react-dom': 'react-dom',
    'prop-types': 'prop-types',
    'react-redux': 'react-redux',
    redux: 'redux',
  },
  plugins: [
    new UglifyJSPlugin(),
  ],
};