text: // @remove-on-eject-begin
  /**
   * Copyright (c) 2015-present, Facebook, Inc.
   * All rights reserved.
   *
   * This source code is licensed under the BSD-style license found in the
   * LICENSE file in the root directory of this source tree. An additional grant
   * of patent rights can be found in the PATENTS file in the same directory.
   */
  // @remove-on-eject-end
  'use strict';
  
  const autoprefixer = require('autoprefixer');
  const webpack = require('webpack');
  const HtmlWebpackPlugin = require('html-webpack-plugin');
  const ExtractTextPlugin = require('extract-text-webpack-plugin');
  const ManifestPlugin = require('webpack-manifest-plugin');
  const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
  const paths = require('./paths');
  const path = require('path');
  const getClientEnvironment = require('./env');
  
  // Webpack uses `publicPath` to determine where the app is being served from.
  // It requires a trailing slash, or the file assets will get an incorrect path.
  const publicPath = paths.servedPath;
  // Some apps do not use client-side routing with pushState.
  // For these, "homepage" can be set to "." to enable relative asset paths.
  const shouldUseRelativeAssetPaths = publicPath === './';
  // `publicUrl` is just like `publicPath`, but we will provide it to our app
  // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
  // Omit trailing slash as %PUBLIC_URL%/xyz looks better than %PUBLIC_URL%xyz.
  const publicUrl = publicPath.slice(0, -1);
  // Get environment variables to inject into our app.
  const env = getClientEnvironment(publicUrl);
  
  // Assert this just to be safe.
  // Development builds of React are slow and not intended for production.
  if (env.stringified['process.env'].NODE_ENV !== '"production"') {
      throw new Error('Production builds must have NODE_ENV=production.');
  }
  
  // Note: defined here because it will be used more than once.
  const cssFilename = 'static/css/[name].[contenthash:8].css';
  
  // ExtractTextPlugin expects the build output to be flat.
  // (See https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/27)
  // However, our output is structured with css, js and media folders.
  // To have this structure working with relative paths, we have to use custom options.
  const extractTextPluginOptions = shouldUseRelativeAssetPaths
      ? // Making sure that the publicPath goes back to to build folder.
      { publicPath: Array(cssFilename.split('/').length).join('../') }
      : {};
  
  // This is the production configuration.
  // It compiles slowly and is focused on producing a fast and minimal bundle.
  // The development configuration is different and lives in a separate file.
  module.exports = {
      // Don't attempt to continue if there are any errors.
      bail: true,
      // We generate sourcemaps in production. This is slow but gives good results.
      // You can exclude the *.map files from the build during deployment.
      devtool: 'source-map',
      // In production, we only want to load the polyfills and the app code.
      entry: [require.resolve('./polyfills'), paths.appIndexJs],
      output: {
          // The build folder.
          path: paths.appBuild,
          // Generated JS file names (with nested folders).
          // There will be one main bundle, and one file per asynchronous chunk.
          // We don't currently advertise code splitting but Webpack supports it.
          filename: 'static/js/[name].[chunkhash:8].js',
          chunkFilename: 'static/js/[name].[chunkhash:8].chunk.js',
          publicPath: publicPath
      },
      resolve: {
          // This allows you to set a fallback for where Webpack should look for modules.
          // We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
          // We placed these paths second because we want `node_modules` to "win"
          // if there are any conflicts. This matches Node resolution mechanism.
          // https://github.com/facebookincubator/create-react-app/issues/253
          modules: ['node_modules', paths.appNodeModules].concat(paths.nodePaths),
          // These are the reasonable defaults supported by the Node ecosystem.
          // We also include JSX as a common component filename extension to support
          // some tools, although we do not recommend using it, see:
          // https://github.com/facebookincubator/create-react-app/issues/290
          extensions: ['.js', '.json', '.jsx'],
          alias: {
              // Support React Native Web
              // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
              'react': path.resolve('./node_modules/react'),
              'react-native': 'react-native-web',
          },
      },
      // @remove-on-eject-begin
      // Resolve loaders (webpack plugins for CSS, images, transpilation) from the
      // directory of `rest-ui-scripts` itself rather than the project directory.
      resolveLoader: {
          modules: [
              paths.ownNodeModules,
              // Lerna hoists everything, so we need to look in our app directory
              paths.appNodeModules,
          ],
      },
      // @remove-on-eject-end
      module: {
          rules: [
              // Disable require.ensure as it's not a standard language feature.
              { parser: { requireEnsure: false } },
              // First, run the linter.
              // It's important to do this before Babel processes the JS.
              {
                  test: /\.(js|jsx)$/,
                  enforce: 'pre',
                  use: [
                      {
                          // @remove-on-eject-begin
                          // Point ESLint to our predefined config.
                          options: {
                              // TODO: consider separate config for production,
                              // e.g. to enable no-console and no-debugger only in production.
                              baseConfig: {
                                  extends: ['react-app'],
                              },
                              useEslintrc: false,
                          },
                          // @remove-on-eject-end
                          loader: 'eslint-loader',
                      },
                  ],
                  include: paths.appSrc,
              },
              // ** ADDING/UPDATING LOADERS **
              // The "url" loader handles all assets unless explicitly excluded.
              // The `exclude` list *must* be updated with every change to loader extensions.
              // When adding a new loader, you must add its `test`
              // as a new entry in the `exclude` list in the "url" loader.
  
              // "file" loader makes sure those assets end up in the `build` folder.
              // When you `import` an asset, you get its filename.
              {
                  exclude: [
                      /\.html$/,
                      /\.(js|jsx)$/,
                      /\.css$/,
                      /\.json$/,
                      /\.bmp$/,
                      /\.gif$/,
                      /\.jpe?g$/,
                      /\.png$/,
                  ],
                  loader: 'file-loader',
                  options: {
                      name: 'static/media/[name].[hash:8].[ext]',
                  },
              },
              // "url" loader works just like "file" loader but it also embeds
              // assets smaller than specified size as data URLs to avoid requests.
              {
                  test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
                  loader: 'url-loader',
                  options: {
                      limit: 10000,
                      name: 'static/media/[name].[hash:8].[ext]',
                  },
              },
              // Process JS with Babel.
              {
                  test: /\.(js|jsx)$/,
                  include: paths.appSrc,
                  loader: 'babel-loader',
                  // @remove-on-eject-begin
                  options: {
                      babelrc: false,
                      presets: [require.resolve('babel-preset-react-app')],
                  },
                  // @remove-on-eject-end
              },
              // The notation here is somewhat confusing.
              // "postcss" loader applies autoprefixer to our CSS.
              // "css" loader resolves paths in CSS and adds assets as dependencies.
              // "style" loader normally turns CSS into JS modules injecting <style>,
              // but unlike in development configuration, we do something different.
              // `ExtractTextPlugin` first applies the "postcss" and "css" loaders
              // (second argument), then grabs the result CSS and puts it into a
              // separate file in our build process. This way we actually ship
              // a single CSS file in production instead of JS code injecting <style>
              // tags. If you use code splitting, however, any async bundles will still
              // use the "style" loader inside the async code so CSS from them won't be
              // in the main CSS file.
              {
                  test: /\.css$/,
                  loader: ExtractTextPlugin.extract(
                      Object.assign(
                          {
                              fallback: 'style-loader',
                              use: [
                                  {
                                      loader: 'css-loader',
                                      options: {
                                          importLoaders: 1,
                                      },
                                  },
                                  {
                                      loader: 'postcss-loader',
                                      options: {
                                          ident: 'postcss', // https://webpack.js.org/guides/migrating/#complex-options
                                          plugins: () => [
                                              autoprefixer({
                                                  browsers: [
                                                      '>1%',
                                                      'last 4 versions',
                                                      'Firefox ESR',
                                                      'not ie < 9', // React doesn't support IE8 anyway
                                                  ],
                                              }),
                                          ],
                                      },
                                  },
                              ],
                          },
                          extractTextPluginOptions
                      )
                  ),
                  // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
              },
              // ** STOP ** Are you adding a new loader?
              // Remember to add the new extension(s) to the "url" loader exclusion list.
          ],
      },
      plugins: [
          // Makes some environment variables available in index.html.
          // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
          // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
          // In production, it will be an empty string unless you specify "homepage"
          // in `package.json`, in which case it will be the pathname of that URL.
          new InterpolateHtmlPlugin(env.raw),
          // Generates an `index.html` file with the <script> injected.
          new HtmlWebpackPlugin({
              inject: true,
              template: paths.appHtml,
              minify: {
                  removeComments: true,
                  collapseWhitespace: true,
                  removeRedundantAttributes: true,
                  useShortDoctype: true,
                  removeEmptyAttributes: true,
                  removeStyleLinkTypeAttributes: true,
                  keepClosingSlash: true,
                  minifyJS: true,
                  minifyCSS: true,
                  minifyURLs: true,
              },
          }),
          // Makes some environment variables available to the JS code, for example:
          // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
          // It is absolutely essential that NODE_ENV was set to production here.
          // Otherwise React will be compiled in the very slow development mode.
          new webpack.DefinePlugin(env.stringified),
          // Minify the code.
          new webpack.optimize.UglifyJsPlugin({
              compress: {
                  screw_ie8: true, // React doesn't support IE8
                  warnings: false,
              },
              mangle: {
                  screw_ie8: true,
              },
              output: {
                  comments: false,
                  screw_ie8: true,
              },
              sourceMap: true,
          }),
          // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
          new ExtractTextPlugin({
              filename: cssFilename,
          }),
          // Generate a manifest file which contains a mapping of all asset filenames
          // to their corresponding output file so that tools can pick it up without
          // having to parse `index.html`.
          new ManifestPlugin({
              fileName: 'asset-manifest.json',
          }),
      ],
      // Some libraries import Node modules but don't use them in the browser.
      // Tell Webpack to provide empty mocks for them so importing them works.
      node: {
          fs: 'empty',
          net: 'empty',
          tls: 'empty',
      },
  };
  