webpack.prod.config.js

const webpack = require('webpack');
const path = require('path');
const pkg = require('./package.json');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const htmlWebpackPlugin = new HtmlWebpackPlugin({
  template: path.join(__dirname, 'examples/src/index.html'),
  filename: './index.html'
});
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
module.exports = {
  entry: path.join(__dirname, 'src/index.js'),
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        use: "babel-loader",
        exclude: /node_modules/
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          'css-loader'
        ]
      }
    ]
  },
  output: {
    path: path.join(__dirname, './dist'),
    filename: 'index.js',
    libraryTarget: 'commonjs2',
    publicPath: '/dist/',
    // umdNamedDefine: true
  },
  resolve: {
    alias: {
      'react': path.resolve(__dirname, './node_modules/react'),
      'react-dom': path.resolve(__dirname, './node_modules/react-dom')
    }
  },
  externals: {
    react: {
      commonjs: "react",
      commonjs2: "react",
      amd: "React",
      root: "React"
    },
    "react-dom": {
      commonjs: "react-dom",
      commonjs2: "react-dom",
      amd: "ReactDOM",
      root: "ReactDOM"
    }
  },
  plugins: [
    htmlWebpackPlugin,
    new MiniCssExtractPlugin({filename: 'coinbase-commerce-button.css', chunkFilename: '[id].css'}),
    new webpack.DefinePlugin({VERSION: JSON.stringify(pkg.version)})
  ],
  resolve: {
    extensions: ['.js', '.jsx']
  },
  devServer: {
    port: 3333
  }
};