text: const fs = require("fs");
  const isWsl = require("is-wsl");
  const path = require("path");
  const webpack = require("webpack");
  const resolve = require("resolve");
  const PnpWebpackPlugin = require("pnp-webpack-plugin");
  const HtmlWebpackPlugin = require("html-webpack-plugin");
  const CaseSensitivePathsPlugin = require("case-sensitive-paths-webpack-plugin");
  const InlineChunkHtmlPlugin = require("react-dev-utils/InlineChunkHtmlPlugin");
  const TerserPlugin = require("terser-webpack-plugin");
  const MiniCssExtractPlugin = require("mini-css-extract-plugin");
  const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
  const safePostCssParser = require("postcss-safe-parser");
  const ManifestPlugin = require("webpack-manifest-plugin");
  const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
  const WorkboxWebpackPlugin = require("workbox-webpack-plugin");
  const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
  const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
  const getCSSModuleLocalIdent = require("react-dev-utils/getCSSModuleLocalIdent");
  const paths = require("./paths");
  const modules = require("./modules");
  const getClientEnvironment = require("./env");
  const ModuleNotFoundPlugin = require("react-dev-utils/ModuleNotFoundPlugin");
  const ForkTsCheckerWebpackPlugin = require("react-dev-utils/ForkTsCheckerWebpackPlugin");
  const typescriptFormatter = require("react-dev-utils/typescriptFormatter");
  const eslint = require("eslint");
  const BundleAnalyzerPlugin = require("webpack-bundle-analyzer")
      .BundleAnalyzerPlugin;
  
  const postcssNormalize = require("postcss-normalize");
  
  const appPackageJson = require(paths.appPackageJson);
  
  // Source maps are resource heavy and can cause out of memory issue for large source files.
  const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== "false";
  // Some apps do not need the benefits of saving a web request, so not inlining the chunk
  // makes for a smoother build process.
  const shouldInlineRuntimeChunk = process.env.INLINE_RUNTIME_CHUNK !== "false";
  
  const imageInlineSizeLimit = parseInt(
      process.env.IMAGE_INLINE_SIZE_LIMIT || "10000"
  );
  
  // Check if TypeScript is setup
  const useTypeScript = fs.existsSync(paths.appTsConfig);
  
  // style files regexes
  const cssRegex = /\.css$/;
  const cssModuleRegex = /\.module\.css$/;
  const sassRegex = /\.(scss|sass)$/;
  const sassModuleRegex = /\.module\.(scss|sass)$/;
  
  // This is the production and development configuration.
  // It is focused on developer experience, fast rebuilds, and a minimal bundle.
  module.exports = function(webpackEnv) {
      const isEnvDevelopment = webpackEnv === "development";
      const isEnvProduction = webpackEnv === "production";
  
      // 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.
      // In development, we always serve from the root. This makes config easier.
      const publicPath = isEnvProduction
          ? paths.servedPath
          : isEnvDevelopment && "/";
      // 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 = isEnvProduction
          ? publicPath.slice(0, -1)
          : isEnvDevelopment && "";
      // Get environment variables to inject into our app.
      const env = getClientEnvironment(publicUrl);
  
      // common function to get style loaders
      const getStyleLoaders = (cssOptions, preProcessor) => {
          const loaders = [
              isEnvDevelopment && require.resolve("style-loader"),
              isEnvProduction && {
                  loader: MiniCssExtractPlugin.loader,
                  options: shouldUseRelativeAssetPaths
                      ? { publicPath: "../../" }
                      : {},
              },
              {
                  loader: require.resolve("css-loader"),
                  options: cssOptions,
              },
              {
                  // Options for PostCSS as we reference these options twice
                  // Adds vendor prefixing based on your specified browser support in
                  // package.json
                  loader: require.resolve("postcss-loader"),
                  options: {
                      // Necessary for external CSS imports to work
                      // https://github.com/facebook/create-react-app/issues/2677
                      ident: "postcss",
                      plugins: () => [
                          require("postcss-flexbugs-fixes"),
                          require("postcss-preset-env")({
                              autoprefixer: {
                                  flexbox: "no-2009",
                              },
                              stage: 3,
                          }),
                          // Adds PostCSS Normalize as the reset css with default options,
                          // so that it honors browserslist config in package.json
                          // which in turn let's users customize the target behavior as per their needs.
                          postcssNormalize(),
                      ],
                      sourceMap: isEnvProduction && shouldUseSourceMap,
                  },
              },
          ].filter(Boolean);
          if (preProcessor) {
              loaders.push(
                  {
                      loader: require.resolve("resolve-url-loader"),
                      options: {
                          sourceMap: isEnvProduction && shouldUseSourceMap,
                      },
                  },
                  {
                      loader: require.resolve(preProcessor),
                      options: {
                          sourceMap: true,
                      },
                  }
              );
          }
          return loaders;
      };
  
      return {
          mode: isEnvProduction
              ? "production"
              : isEnvDevelopment && "development",
          // Stop compilation early in production
          bail: isEnvProduction,
          devtool: isEnvProduction
              ? shouldUseSourceMap
                  ? "source-map"
                  : false
              : isEnvDevelopment && "cheap-module-source-map",
          // These are the "entry points" to our application.
          // This means they will be the "root" imports that are included in JS bundle.
          entry: {
              index: [
                  paths.appIndexJs,
                  isEnvDevelopment &&
                      require.resolve("react-dev-utils/webpackHotDevClient"),
              ].filter(Boolean),
              query: [
                  paths.appQueryJs,
                  isEnvDevelopment &&
                      require.resolve("react-dev-utils/webpackHotDevClient"),
              ].filter(Boolean),
              order: [
                  paths.appOrderJs,
                  isEnvDevelopment &&
                      require.resolve("react-dev-utils/webpackHotDevClient"),
              ].filter(Boolean),
              ticket: [
                  paths.appTicketJs,
                  isEnvDevelopment &&
                      require.resolve("react-dev-utils/webpackHotDevClient"),
              ].filter(Boolean),
          },
          output: {
              // The build folder.
              path: isEnvProduction ? paths.appBuild : undefined,
              // Add /* filename */ comments to generated require()s in the output.
              pathinfo: isEnvDevelopment,
              // There will be one main bundle, and one file per asynchronous chunk.
              // In development, it does not produce real files.
              filename: isEnvProduction
                  ? "js/[name].[contenthash:8].js"
                  : isEnvDevelopment && "js/[name].js",
              // TODO: remove this when upgrading to webpack 5
              futureEmitAssets: true,
              // There are also additional JS chunk files if you use code splitting.
              chunkFilename: isEnvProduction
                  ? "js/[name].[contenthash:8].chunk.js"
                  : isEnvDevelopment && "js/[name].chunk.js",
              // We inferred the "public path" (such as / or /my-project) from homepage.
              // We use "/" in development.
              publicPath: publicPath,
              // Point sourcemap entries to original disk location (format as URL on Windows)
              devtoolModuleFilenameTemplate: isEnvProduction
                  ? info =>
                        path
                            .relative(paths.appSrc, info.absoluteResourcePath)
                            .replace(/\\/g, "/")
                  : isEnvDevelopment &&
                    (info =>
                        path
                            .resolve(info.absoluteResourcePath)
                            .replace(/\\/g, "/")),
              // Prevents conflicts when multiple Webpack runtimes (from different apps)
              // are used on the same page.
              jsonpFunction: `webpackJsonp${appPackageJson.name}`,
          },
          optimization: {
              minimize: isEnvProduction,
              minimizer: [
                  // This is only used in production mode
                  new TerserPlugin({
                      terserOptions: {
                          parse: {
                              // We want terser to parse ecma 8 code. However, we don't want it
                              // to apply any minification steps that turns valid ecma 5 code
                              // into invalid ecma 5 code. This is why the 'compress' and 'output'
                              // sections only apply transformations that are ecma 5 safe
                              // https://github.com/facebook/create-react-app/pull/4234
                              ecma: 8,
                          },
                          compress: {
                              ecma: 5,
                              warnings: false,
                              // Disabled because of an issue with Uglify breaking seemingly valid code:
                              // https://github.com/facebook/create-react-app/issues/2376
                              // Pending further investigation:
                              // https://github.com/mishoo/UglifyJS2/issues/2011
                              comparisons: false,
                              // Disabled because of an issue with Terser breaking valid code:
                              // https://github.com/facebook/create-react-app/issues/5250
                              // Pending further investigation:
                              // https://github.com/terser-js/terser/issues/120
                              inline: 2,
                          },
                          mangle: {
                              safari10: true,
                          },
                          output: {
                              ecma: 5,
                              comments: false,
                              // Turned on because emoji and regex is not minified properly using default
                              // https://github.com/facebook/create-react-app/issues/2488
                              ascii_only: true,
                          },
                      },
                      // Use multi-process parallel running to improve the build speed
                      // Default number of concurrent runs: os.cpus().length - 1
                      // Disabled on WSL (Windows Subsystem for Linux) due to an issue with Terser
                      // https://github.com/webpack-contrib/terser-webpack-plugin/issues/21
                      parallel: !isWsl,
                      // Enable file caching
                      cache: true,
                      sourceMap: shouldUseSourceMap,
                  }),
                  // This is only used in production mode
                  new OptimizeCSSAssetsPlugin({
                      cssProcessorOptions: {
                          parser: safePostCssParser,
                          map: shouldUseSourceMap
                              ? {
                                    // `inline: false` forces the sourcemap to be output into a
                                    // separate file
                                    inline: false,
                                    // `annotation: true` appends the sourceMappingURL to the end of
                                    // the css file, helping the browser find the sourcemap
                                    annotation: true,
                                }
                              : false,
                      },
                  }),
              ],
              // Automatically split vendor and commons
              // https://twitter.com/wSokra/status/969633336732905474
              // https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
              splitChunks: {
                  chunks: "all",
                  name: false,
              },
              // Keep the runtime chunk separated to enable long term caching
              // https://twitter.com/wSokra/status/969679223278505985
              // https://github.com/facebook/create-react-app/issues/5358
              runtimeChunk: {
                  name: entrypoint => `runtime-${entrypoint.name}`,
              },
          },
          resolve: {
              // This allows you to set a fallback for where Webpack should look for modules.
              // 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/facebook/create-react-app/issues/253
              modules: ["node_modules", paths.appNodeModules].concat(
                  modules.additionalModulePaths || []
              ),
              // 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/facebook/create-react-app/issues/290
              // `web` extension prefixes have been added for better support
              // for React Native Web.
              extensions: paths.moduleFileExtensions
                  .map(ext => `.${ext}`)
                  .filter(ext => useTypeScript || !ext.includes("ts")),
              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",
              },
              plugins: [
                  // Adds support for installing with Plug'n'Play, leading to faster installs and adding
                  // guards against forgotten dependencies and such.
                  PnpWebpackPlugin,
                  // Prevents users from importing files from outside of src/ (or node_modules/).
                  // This often causes confusion because we only process files within src/ with babel.
                  // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
                  // please link the files into your node_modules/ and let module-resolution kick in.
                  // Make sure your source files are compiled, as they will not be processed in any way.
                  new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
              ],
          },
          resolveLoader: {
              plugins: [
                  // Also related to Plug'n'Play, but this time it tells Webpack to load its loaders
                  // from the current package.
                  PnpWebpackPlugin.moduleLoader(module),
              ],
          },
          module: {
              strictExportPresence: true,
              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|mjs|jsx|ts|tsx)$/,
                      enforce: "pre",
                      use: [
                          {
                              options: {
                                  cache: true,
                                  formatter: require.resolve(
                                      "react-dev-utils/eslintFormatter"
                                  ),
                                  eslintPath: require.resolve("eslint"),
                                  resolvePluginsRelativeTo: __dirname,
                              },
                              loader: require.resolve("eslint-loader"),
                          },
                      ],
                      include: paths.appSrc,
                  },
                  {
                      // "oneOf" will traverse all following loaders until one will
                      // match the requirements. When no loader matches it will fall
                      // back to the "file" loader at the end of the loader list.
                      oneOf: [
                          // "url" loader works like "file" loader except that it embeds assets
                          // smaller than specified limit in bytes as data URLs to avoid requests.
                          // A missing `test` is equivalent to a match.
                          {
                              test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
                              loader: require.resolve("url-loader"),
                              options: {
                                  limit: imageInlineSizeLimit,
                                  name: "static/media/[name].[hash:8].[ext]",
                              },
                          },
                          // Process application JS with Babel.
                          // The preset includes JSX, Flow, TypeScript, and some ESnext features.
                          {
                              test: /\.(js|mjs|jsx|ts|tsx)$/,
                              include: paths.appSrc,
                              loader: require.resolve("babel-loader"),
                              options: {
                                  customize: require.resolve(
                                      "babel-preset-react-app/webpack-overrides"
                                  ),
  
                                  plugins: [
                                      [
                                          require.resolve(
                                              "babel-plugin-named-asset-import"
                                          ),
                                          {
                                              loaderMap: {
                                                  svg: {
                                                      ReactComponent:
                                                          "@svgr/webpack?-svgo,+titleProp,+ref![path]",
                                                  },
                                              },
                                          },
                                      ],
                                  ],
                                  // This is a feature of `babel-loader` for webpack (not Babel itself).
                                  // It enables caching results in ./node_modules/.cache/babel-loader/
                                  // directory for faster rebuilds.
                                  cacheDirectory: true,
                                  // See #6846 for context on why cacheCompression is disabled
                                  cacheCompression: false,
                                  compact: isEnvProduction,
                              },
                          },
                          // Process any JS outside of the app with Babel.
                          // Unlike the application JS, we only compile the standard ES features.
                          {
                              test: /\.(js|mjs)$/,
                              exclude: /@babel(?:\/|\\{1,2})runtime/,
                              loader: require.resolve("babel-loader"),
                              options: {
                                  babelrc: false,
                                  configFile: false,
                                  compact: false,
                                  presets: [
                                      [
                                          require.resolve(
                                              "babel-preset-react-app/dependencies"
                                          ),
                                          { helpers: true },
                                      ],
                                  ],
                                  cacheDirectory: true,
                                  // See #6846 for context on why cacheCompression is disabled
                                  cacheCompression: false,
  
                                  // If an error happens in a package, it's possible to be
                                  // because it was compiled. Thus, we don't want the browser
                                  // debugger to show the original code. Instead, the code
                                  // being evaluated would be much more helpful.
                                  sourceMaps: false,
                              },
                          },
                          // "postcss" loader applies autoprefixer to our CSS.
                          // "css" loader resolves paths in CSS and adds assets as dependencies.
                          // "style" loader turns CSS into JS modules that inject <style> tags.
                          // In production, we use MiniCSSExtractPlugin to extract that CSS
                          // to a file, but in development "style" loader enables hot editing
                          // of CSS.
                          // By default we support CSS Modules with the extension .module.css
                          {
                              test: cssRegex,
                              exclude: cssModuleRegex,
                              use: getStyleLoaders({
                                  importLoaders: 1,
                                  sourceMap:
                                      isEnvProduction && shouldUseSourceMap,
                              }),
                              // Don't consider CSS imports dead code even if the
                              // containing package claims to have no side effects.
                              // Remove this when webpack adds a warning or an error for this.
                              // See https://github.com/webpack/webpack/issues/6571
                              sideEffects: true,
                          },
                          // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
                          // using the extension .module.css
                          {
                              test: cssModuleRegex,
                              use: getStyleLoaders({
                                  importLoaders: 1,
                                  sourceMap:
                                      isEnvProduction && shouldUseSourceMap,
                                  modules: true,
                                  getLocalIdent: getCSSModuleLocalIdent,
                              }),
                          },
                          // Opt-in support for SASS (using .scss or .sass extensions).
                          // By default we support SASS Modules with the
                          // extensions .module.scss or .module.sass
                          {
                              test: sassRegex,
                              exclude: sassModuleRegex,
                              use: getStyleLoaders(
                                  {
                                      importLoaders: 2,
                                      sourceMap:
                                          isEnvProduction && shouldUseSourceMap,
                                  },
                                  "sass-loader"
                              ),
                              // Don't consider CSS imports dead code even if the
                              // containing package claims to have no side effects.
                              // Remove this when webpack adds a warning or an error for this.
                              // See https://github.com/webpack/webpack/issues/6571
                              sideEffects: true,
                          },
                          // Adds support for CSS Modules, but using SASS
                          // using the extension .module.scss or .module.sass
                          {
                              test: sassModuleRegex,
                              use: getStyleLoaders(
                                  {
                                      importLoaders: 2,
                                      sourceMap:
                                          isEnvProduction && shouldUseSourceMap,
                                      modules: true,
                                      getLocalIdent: getCSSModuleLocalIdent,
                                  },
                                  "sass-loader"
                              ),
                          },
                          // "file" loader makes sure those assets get served by WebpackDevServer.
                          // When you `import` an asset, you get its (virtual) filename.
                          // In production, they would get copied to the `build` folder.
                          // This loader doesn't use a "test" so it will catch all modules
                          // that fall through the other loaders.
                          {
                              loader: require.resolve("file-loader"),
                              // Exclude `js` files to keep "css" loader working as it injects
                              // its runtime that would otherwise be processed through "file" loader.
                              // Also exclude `html` and `json` extensions so they get processed
                              // by webpacks internal loaders.
                              exclude: [
                                  /\.(js|mjs|jsx|ts|tsx)$/,
                                  /\.html$/,
                                  /\.json$/,
                              ],
                              options: {
                                  name: "static/media/[name].[hash:8].[ext]",
                              },
                          },
                          // ** STOP ** Are you adding a new loader?
                          // Make sure to add the new loader(s) before the "file" loader.
                      ],
                  },
              ],
          },
          plugins: [
              process.env.GENERATE_BUNDLE_ANALYZER === "true" &&
                  new BundleAnalyzerPlugin({
                      openAnalyzer: false,
                      analyzerMode: "static",
                  }),
              // Generates an `index.html` file with the <script> injected.
              new HtmlWebpackPlugin(
                  Object.assign(
                      {},
                      {
                          inject: true,
                          template: paths.appHtml,
                          filename: "index.html",
                          chunks: ["index"],
                      },
                      isEnvProduction
                          ? {
                                minify: {
                                    removeComments: true,
                                    collapseWhitespace: true,
                                    removeRedundantAttributes: true,
                                    useShortDoctype: true,
                                    removeEmptyAttributes: true,
                                    removeStyleLinkTypeAttributes: true,
                                    keepClosingSlash: true,
                                    minifyJS: true,
                                    minifyCSS: true,
                                    minifyURLs: true,
                                },
                            }
                          : undefined
                  )
              ),
              new HtmlWebpackPlugin(
                  Object.assign(
                      {},
                      {
                          inject: true,
                          template: paths.appQueryHtml,
                          filename: "query.html",
                          chunks: ["query"],
                      },
                      isEnvProduction
                          ? {
                                minify: {
                                    removeComments: true,
                                    collapseWhitespace: true,
                                    removeRedundantAttributes: true,
                                    useShortDoctype: true,
                                    removeEmptyAttributes: true,
                                    removeStyleLinkTypeAttributes: true,
                                    keepClosingSlash: true,
                                    minifyJS: true,
                                    minifyCSS: true,
                                    minifyURLs: true,
                                },
                            }
                          : undefined
                  )
              ),
              new HtmlWebpackPlugin(
                  Object.assign(
                      {},
                      {
                          inject: true,
                          template: paths.appOrderHtml,
                          filename: "order.html",
                          chunks: ["order"],
                      },
                      isEnvProduction
                          ? {
                                minify: {
                                    removeComments: true,
                                    collapseWhitespace: true,
                                    removeRedundantAttributes: true,
                                    useShortDoctype: true,
                                    removeEmptyAttributes: true,
                                    removeStyleLinkTypeAttributes: true,
                                    keepClosingSlash: true,
                                    minifyJS: true,
                                    minifyCSS: true,
                                    minifyURLs: true,
                                },
                            }
                          : undefined
                  )
              ),
              new HtmlWebpackPlugin(
                  Object.assign(
                      {},
                      {
                          inject: true,
                          template: paths.appTicketHtml,
                          filename: "ticket.html",
                          chunks: ["ticket"],
                      },
                      isEnvProduction
                          ? {
                                minify: {
                                    removeComments: true,
                                    collapseWhitespace: true,
                                    removeRedundantAttributes: true,
                                    useShortDoctype: true,
                                    removeEmptyAttributes: true,
                                    removeStyleLinkTypeAttributes: true,
                                    keepClosingSlash: true,
                                    minifyJS: true,
                                    minifyCSS: true,
                                    minifyURLs: true,
                                },
                            }
                          : undefined
                  )
              ),
              // Inlines the webpack runtime script. This script is too small to warrant
              // a network request.
              // https://github.com/facebook/create-react-app/issues/5358
              isEnvProduction &&
                  shouldInlineRuntimeChunk &&
                  new InlineChunkHtmlPlugin(HtmlWebpackPlugin, [
                      /runtime-.+[.]js/,
                  ]),
              // 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.
              // In development, this will be an empty string.
              new InterpolateHtmlPlugin(HtmlWebpackPlugin, env.raw),
              // This gives some necessary context to module not found errors, such as
              // the requesting resource.
              new ModuleNotFoundPlugin(paths.appPath),
              // 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 is set to production
              // during a production build.
              // Otherwise React will be compiled in the very slow development mode.
              new webpack.DefinePlugin(env.stringified),
              // This is necessary to emit hot updates (currently CSS only):
              isEnvDevelopment && new webpack.HotModuleReplacementPlugin(),
              // Watcher doesn't work well if you mistype casing in a path so we use
              // a plugin that prints an error when you attempt to do this.
              // See https://github.com/facebook/create-react-app/issues/240
              isEnvDevelopment && new CaseSensitivePathsPlugin(),
              // If you require a missing module and then `npm install` it, you still have
              // to restart the development server for Webpack to discover it. This plugin
              // makes the discovery automatic so you don't have to restart.
              // See https://github.com/facebook/create-react-app/issues/186
              isEnvDevelopment &&
                  new WatchMissingNodeModulesPlugin(paths.appNodeModules),
              isEnvProduction &&
                  new MiniCssExtractPlugin({
                      // Options similar to the same options in webpackOptions.output
                      // both options are optional
                      filename: "static/css/[name].[contenthash:8].css",
                      chunkFilename:
                          "static/css/[name].[contenthash:8].chunk.css",
                  }),
              // 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",
                  publicPath: publicPath,
                  generate: (seed, files) => {
                      const manifestFiles = files.reduce(function(
                          manifest,
                          file
                      ) {
                          manifest[file.name] = file.path;
                          return manifest;
                      },
                      seed);
  
                      return {
                          files: manifestFiles,
                      };
                  },
              }),
              // Moment.js is an extremely popular library that bundles large locale files
              // by default due to how Webpack interprets its code. This is a practical
              // solution that requires the user to opt into importing specific locales.
              // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
              // You can remove this if you don't use Moment.js:
              new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
              // Generate a service worker script that will precache, and keep up to date,
              // the HTML & assets that are part of the Webpack build.
              isEnvProduction &&
                  new WorkboxWebpackPlugin.GenerateSW({
                      clientsClaim: true,
                      exclude: [/\.map$/, /asset-manifest\.json$/],
                      importWorkboxFrom: "cdn",
                      navigateFallback: publicUrl + "/index.html",
                      navigateFallbackBlacklist: [
                          // Exclude URLs starting with /_, as they're likely an API call
                          new RegExp("^/_"),
                          // Exclude any URLs whose last part seems to be a file extension
                          // as they're likely a resource and not a SPA route.
                          // URLs containing a "?" character won't be blacklisted as they're likely
                          // a route with query params (e.g. auth callbacks).
                          new RegExp("/[^/?]+\\.[^/]+$"),
                      ],
                  }),
              // TypeScript type checking
              useTypeScript &&
                  new ForkTsCheckerWebpackPlugin({
                      typescript: resolve.sync("typescript", {
                          basedir: paths.appNodeModules,
                      }),
                      async: isEnvDevelopment,
                      useTypescriptIncrementalApi: true,
                      checkSyntacticErrors: true,
                      resolveModuleNameModule: process.versions.pnp
                          ? `${__dirname}/pnpTs.js`
                          : undefined,
                      resolveTypeReferenceDirectiveModule: process.versions.pnp
                          ? `${__dirname}/pnpTs.js`
                          : undefined,
                      tsconfig: paths.appTsConfig,
                      reportFiles: [
                          "**",
                          "!**/__tests__/**",
                          "!**/?(*.)(spec|test).*",
                          "!**/src/setupProxy.*",
                          "!**/src/setupTests.*",
                      ],
                      silent: true,
                      // The formatter is invoked directly in WebpackDevServerUtils during development
                      formatter: isEnvProduction
                          ? typescriptFormatter
                          : undefined,
                  }),
          ].filter(Boolean),
          // 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: {
              module: "empty",
              dgram: "empty",
              dns: "mock",
              fs: "empty",
              http2: "empty",
              net: "empty",
              tls: "empty",
              child_process: "empty",
          },
          // Turn off performance processing because we utilize
          // our own hints via the FileSizeReporter
          performance: false,
      };
  };
  