create-react-app/packages/react-error-overlay/webpack.config.iframe.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
'use strict';

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

module.exports = {
  entry: './src/iframeScript.js',
  output: {
    path: path.join(__dirname, './lib'),
    filename: 'iframe-bundle.js',
  },
  module: {
    rules: [
      {
        oneOf: [
          // Source
          {
            test: /\.js$/,
            include: [path.resolve(__dirname, './src')],
            use: {
              loader: 'babel-loader',
            },
          },
          // Dependencies
          {
            test: /\.js$/,
            use: {
              loader: 'babel-loader',
              options: {
                babelrc: false,
                compact: false,
                presets: ['babel-preset-react-app/dependencies'],
              },
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      // We set process.env.NODE_ENV to 'production' so that React is built
      // in production mode.
      'process.env': { NODE_ENV: '"production"' },
      // This prevents our bundled React from accidentally hijacking devtools.
      __REACT_DEVTOOLS_GLOBAL_HOOK__: '({})',
    }),
    // This code is embedded as a string, so it would never be optimized
    // elsewhere.
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
        comparisons: false,
      },
      output: {
        comments: false,
        ascii_only: false,
      },
    }),
  ],
};