webpack.config.js

const path = require( 'path' );
const webpack = require( 'webpack' );

// Builds web module. Only really used in example code / static site.
module.exports = ( env, argv ) => ( {
  entry: {
    'react-draggable.min': './src/cjs.ts',
  },
  output: {
    filename: '[name].js',
    sourceMapFilename: '[name].js.map',
    devtoolModuleFilenameTemplate: '../[resource-path]',
    library: 'ReactDraggable',
    libraryTarget: 'umd',
    path: path.resolve( __dirname, 'build', 'web' ),
  },
  devServer: {
    hot: true,
    open: './example/index.html',
    client: {
      overlay: true,
    },
    devMiddleware: {
      // disableHostCheck: true,
      writeToDisk: true,
    },
    static: {
      directory: '.',
    }
  },
  devtool: 'source-map',
  externals: {
    'react': {
      'commonjs': 'react',
      'commonjs2': 'react',
      'amd': 'react',
      // React dep should be available as window.React, not window.react
      'root': 'React'
    },
    'react-dom': {
      'commonjs': 'react-dom',
      'commonjs2': 'react-dom',
      'amd': 'react-dom',
      'root': 'ReactDOM'
    }
  },
  module: {
    rules: [
      {
        test: /\.(?:ts|tsx).?$/,
        use: 'ts-loader',
        exclude: /(node_modules)/
      }
      // {
      //   test: /\.(?:js|es).?$/,
      //   loader: 'babel-loader',
      //   options: {
      //     cacheDirectory: false, // intended, have had bugs with env like DRAGGABLE_DEBUG in the past
      //   },
      //   exclude: /(node_modules)/
      // }
    ]
  },
  resolve: {
    extensions: [ '.tsx', '.ts', '.js', '.jsx' ],
  },
  plugins: [
    new webpack.EnvironmentPlugin( {
      // these are default values
      DRAGGABLE_DEBUG: false,
      NODE_ENV: [ 'development', 'production' ].includes( argv.mode ) ? argv.mode : 'production'
    } ),
    // Scope hoisting
    new webpack.optimize.ModuleConcatenationPlugin(),
  ],
  optimization: {
    minimize: false,
  },
  stats: {
    errorDetails: true,
  }
} );