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
  
  var path = require('path');
  var autoprefixer = require('autoprefixer');
  var webpack = require('webpack');
  var HtmlWebpackPlugin = require('html-webpack-plugin');
  var ExtractTextPlugin = require('extract-text-webpack-plugin');
  var url = require('url');
  var paths = require('./paths');
  var env = require('./env');
  
  // Assert this just to be safe.
  // Development builds of React are slow and not intended for production.
  if (env['process.env.NODE_ENV'] !== '"production"') {
    throw new Error('Production builds must have NODE_ENV=production.');
  }
  
  // We use "homepage" field to infer "public path" at which the app is served.
  // Webpack needs to know it to put the right <script> hrefs into HTML even in
  // single-page apps that may serve index.html for nested URLs like /todos/42.
  // We can't use a relative path in HTML because we don't want to load something
  // like /todos/42/static/js/bundle.7289d.js. We have to know the root.
  var homepagePath = require(paths.appPackageJson).homepage;
  var publicPath = homepagePath ? url.parse(homepagePath).pathname : '/';
  if (!publicPath.endsWith('/')) {
    // If we don't do this, file assets will get incorrect paths.
    publicPath += '/';
  }
  
  // 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'),
      path.join(paths.appSrc, 'index')
    ],
    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',
      // We inferred the "public path" (such as / or /my-project) from homepage.
      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 use `fallback` instead of `root` because we want `node_modules` to "win"
      // if there any conflicts. This matches Node resolution mechanism.
      // https://github.com/facebookincubator/create-react-app/issues/253
      fallback: 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-native': 'react-native-web'
      }
    },
    // Resolve loaders (webpack plugins for CSS, images, transpilation) from the
    // directory of `react-scripts` itself rather than the project directory.
    // You can remove this after ejecting.
    resolveLoader: {
      root: paths.ownNodeModules,
      moduleTemplates: ['*-loader']
    },
    module: {
      // First, run the linter.
      // It's important to do this before Babel processes the JS.
      preLoaders: [
        {
          test: /\.(js|jsx)$/,
          loader: 'eslint',
          include: paths.appSrc
        }
      ],
      loaders: [
        // Process JS with Babel.
        {
          test: /\.(js|jsx)$/,
          include: paths.appSrc,
          loader: 'babel',
          query: require('./babel.prod')
        },
        // 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$/,
          // "?-autoprefixer" disables autoprefixer in css-loader itself:
          // https://github.com/webpack/css-loader/issues/281
          // We already have it thanks to postcss. We only pass this flag in
          // production because "css" loader only enables autoprefixer-powered
          // removal of unnecessary prefixes when Uglify plugin is enabled.
          // Webpack 1.x uses Uglify plugin as a signal to minify *all* the assets
          // including CSS. This is confusing and will be removed in Webpack 2:
          // https://github.com/webpack/webpack/issues/283
          loader: ExtractTextPlugin.extract('style', 'css?-autoprefixer!postcss')
          // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
        },
        // JSON is not enabled by default in Webpack but both Node and Browserify
        // allow it implicitly so we also enable it.
        {
          test: /\.json$/,
          loader: 'json'
        },
        // "file" loader makes sure those assets end up in the `build` folder.
        // When you `import` an asset, you get its filename.
        {
          test: /\.(ico|jpg|png|gif|eot|otf|webp|svg|ttf|woff|woff2)(\?.*)?$/,
          exclude: /\/favicon.ico$/,
          loader: 'file',
          query: {
            name: 'static/media/[name].[hash:8].[ext]'
          }
        },
        // A special case for favicon.ico to place it into build root directory.
        {
          test: /\/favicon.ico$/,
          include: [paths.appSrc],
          loader: 'file',
          query: {
            name: 'favicon.ico?[hash:8]'
          }
        },
        // "url" loader works just like "file" loader but it also embeds
        // assets smaller than specified size as data URLs to avoid requests.
        {
          test: /\.(mp4|webm)(\?.*)?$/,
          loader: 'url',
          query: {
            limit: 10000,
            name: 'static/media/[name].[hash:8].[ext]'
          }
        },
        // "html" loader is used to process template page (index.html) to resolve
        // resources linked with <link href="./relative/path"> HTML tags.
        {
          test: /\.html$/,
          loader: 'html',
          query: {
            attrs: ['link:href'],
          }
        }
      ]
    },
    // Point ESLint to our predefined config.
    eslint: {
      // TODO: consider separate config for production,
      // e.g. to enable no-console and no-debugger only in production.
      configFile: path.join(__dirname, 'eslint.js'),
      useEslintrc: false
    },
    // We use PostCSS for autoprefixing only.
    postcss: function() {
      return [
        autoprefixer({
          browsers: [
            '>1%',
            'last 4 versions',
            'Firefox ESR',
            'not ie < 9', // React doesn't support IE8 anyway
          ]
        }),
      ];
    },
    plugins: [
      // 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),
      // This helps ensure the builds are consistent if source hasn't changed:
      new webpack.optimize.OccurrenceOrderPlugin(),
      // Try to dedupe duplicated modules, if any:
      new webpack.optimize.DedupePlugin(),
      // 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
        }
      }),
      // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
      new ExtractTextPlugin('static/css/[name].[contenthash:8].css')
    ]
  };
  