webpack.config.umd.js

const path = require('path');

module.exports = {
  mode: 'development',
  devtool: 'source-map',
  entry: {
    spectacle: './src/index.js'
  },
  output: {
    path: path.join(__dirname, 'dist'),
    pathinfo: true,
    filename: '[name].js',
    library: 'Spectacle',
    libraryTarget: 'umd'
  },
  externals: [
    {
      react: {
        root: 'React',
        commonjs2: 'react',
        commonjs: 'react',
        amd: 'react'
      }
    },
    {
      'react-dom': {
        root: 'ReactDOM',
        commonjs2: 'react-dom',
        commonjs: 'react-dom',
        amd: 'react-dom'
      }
    },
    {
      'prop-types': {
        root: 'PropTypes',
        commonjs2: 'prop-types',
        commonjs: 'prop-types',
        amd: 'prop-types'
      }
    }
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        include: path.resolve(__dirname, 'src'),
        loader: 'babel-loader'
      },
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader'
      },
      {
        test: /\.(png|jpg|gif)$/,
        loader: 'url-loader?limit=8192'
      },
      {
        test: /\.svg$/,
        loader: 'url-loader?limit=10000&mimetype=image/svg+xml'
      }
    ]
  }
};