const fs = require("fs"); 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 getClientEnvironment = require("./env"); const ModuleNotFoundPlugin = require("react-dev-utils/ModuleNotFoundPlugin"); const ForkTsCheckerWebpackPlugin = require("react-dev-utils/ForkTsCheckerWebpackPlugin"); const typescriptFormatter = require("react-dev-utils/typescriptFormatter"); // 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"; // 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); 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: [ // Include an alternative client for WebpackDevServer. A client's job is to // connect to WebpackDevServer by a socket and get notified about changes. // When you save a file, the client will either apply hot updates (in case // of CSS changes), or refresh the page (in case of JS changes). When you // make a syntax error, this client will display a syntax error overlay. // Note: instead of the default WebpackDevServer client, we use a custom one // to bring better experience for Create React App users. You can replace // the line below with these two lines if you prefer the stock client: // require.resolve('webpack-dev-server/client') + '?/', // require.resolve('webpack/hot/dev-server'), isEnvDevelopment && require.resolve("react-dev-utils/webpackHotDevClient"), // Finally, this is your app's code: paths.appIndexJs // We include the app code last so that if there is a runtime error during // initialization, it doesn't blow up the WebpackDevServer client, and // changing JS code would still trigger a refresh. ].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 ? "static/js/[name].[contenthash:8].js" : isEnvDevelopment && "static/js/bundle.js", // There are also additional JS chunk files if you use code splitting. chunkFilename: isEnvProduction ? "static/js/[name].[contenthash:8].chunk.js" : isEnvDevelopment && "static/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, "/")) }, 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 minfication 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 futher 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 parallel: true, // Enable file caching cache: true, sourceMap: shouldUseSourceMap }) ], // 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 runtimeChunk: true }, 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"].concat( // It is guaranteed to exist because we tweak it in `env.js` process.env.NODE_PATH.split(path.delimiter).filter(Boolean) ), // 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 => `.${ext}`), plugins: [ // Adds support for installing with Plug'n'Play, leading to faster installs and adding // guards against forgotten dependencies and such. PnpWebpackPlugin, // Prevents users from importing files from outside of src/ (or node_modules/). // This often causes confusion because we only process files within src/ with babel. // To fix this, we prevent you from importing files out of src/ -- if you'd like to, // please link the files into your node_modules/ and let module-resolution kick in. // Make sure your source files are compiled, as they will not be processed in any way. new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]) ] }, resolveLoader: { plugins: [ // Also related to Plug'n'Play, but this time it tells Webpack to load its loaders // from the current package. PnpWebpackPlugin.moduleLoader(module) ] }, module: { strictExportPresence: true, rules: [ // Disable require.ensure as it's not a standard language feature. { parser: { requireEnsure: false } }, // First, run the linter. // It's important to do this before Babel processes the JS. { test: /\.(js|mjs|jsx)$/, enforce: "pre", use: [ { options: { formatter: require.resolve("react-dev-utils/eslintFormatter"), eslintPath: require.resolve("eslint") }, 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: [ // Process application JS with Babel. { test: /\.(js)$/, include: paths.appSrc, loader: require.resolve("babel-loader"), options: { customize: require.resolve( "babel-preset-react-app/webpack-overrides" ), plugins: [ [ require.resolve("babel-plugin-named-asset-import"), { loaderMap: { svg: { ReactComponent: "@svgr/webpack?-svgo,+ref![path]" } } } ] ], // This is a feature of `babel-loader` for webpack (not Babel itself). // It enables caching results in ./node_modules/.cache/babel-loader/ // directory for faster rebuilds. cacheDirectory: true, cacheCompression: isEnvProduction, compact: isEnvProduction } }, // Process any JS outside of the app with Babel. // Unlike the application JS, we only compile the standard ES features. { test: /\.(js)$/, 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, cacheCompression: isEnvProduction, // 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 } }, // "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$/, /\.html$/, /\.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: [ // Generates an `index.html` file with the <script> injected. new HtmlWebpackPlugin( Object.assign( {}, { inject: true, template: paths.appHtml }, isEnvProduction ? { minify: { removeComments: true, collapseWhitespace: true, removeRedundantAttributes: true, useShortDoctype: true, removeEmptyAttributes: true, removeStyleLinkTypeAttributes: true, keepClosingSlash: true, minifyJS: true, minifyURLs: true } } : undefined ) ), // Inlines the webpack runtime script. This script is too small to warrant // a network request. 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), // 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 }), // 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$/], importWorkboxFrom: "cdn", navigateFallback: publicUrl + "/index.html", navigateFallbackBlacklist: [ // Exclude URLs starting with /_, as they're likely an API call new RegExp("^/_"), // Exclude URLs containing a dot, as they're likely a resource in // public/ and not a SPA route new RegExp("/[^/]+\\.[^/]+$") ] }) // TypeScript type checking ].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", net: "empty", tls: "empty", child_process: "empty" }, // Turn off performance processing because we utilize // our own hints via the FileSizeReporter performance: false }; };