webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

module.exports = {
  mode: 'production',
  entry: './src/js/uwp-ui-react.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'uwp-ui-react.umd.js',
    libraryTarget: 'commonjs2'
  },
  externals: {
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'react',
      root: 'React'
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'react-dom',
      root: 'ReactDOM'
    },
    'prop-types': {
      commonjs: 'prop-types',
      commonjs2: 'prop-types',
      amd: 'prop-types',
      root: 'PropTypes'
    },
    classnames: {
      commonjs: 'classnames',
      commonjs2: 'classnames',
      amd: 'classnames',
      root: 'classNames'
    },
  },
  plugins: [
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // both options are optional
      filename: 'uwp-ui-react.css'
    })
  ],
  module: {
    rules: [{
      test: /\.jsx?$/,
      include: path.resolve(__dirname, 'src/js'),
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['env', 'stage-2', 'react']
        }
      }
    }, {
      test: /\.less$/,
      include: path.resolve(__dirname, 'src/less'),
      use: [
        MiniCssExtractPlugin.loader, {
          loader: 'css-loader',
          options: {
            minimize: true
          }
        },
        'postcss-loader',
        'less-loader'
      ]
    }]
  }
};