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'use strict';
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 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';
// Variable used for enabling profiling in Production
// passed into alias object. Uses a flag if passed into the build command
const isEnvProductionProfile = isEnvProduction && process.argv.includes('--profile');
// 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: [ // 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', // TODO: remove this when upgrading to webpack 5
futureEmitAssets: true, // 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, '/')), // Prevents conflicts when multiple Webpack runtimes (from different apps)
// are used on the same page.
jsonpFunction: `webpackJsonp${appPackageJson.name}`, // this defaults to 'window', but by setting it to 'this' then
// module chunks which are built will work in web workers as well.
globalObject: 'this', }, 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, }, // Added for profiling in devtools
keep_classnames: isEnvProductionProfile, keep_fnames: isEnvProductionProfile, 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,
cacheGroups: { default: 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 => `.${ext}`) .filter(ext => useTypeScript || !ext.includes('ts')), alias: { // Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
'react-native': 'react-native-web', // Allows for better profiling with ReactDevTools
...(isEnvProductionProfile && { 'react-dom$': 'react-dom/profiling', 'scheduler/tracing': 'scheduler/tracing-profiling', }), ...(modules.webpackAliases || {}), }, 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: [ // 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, 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="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 an asset manifest file with the following content:
// - "files" key: Mapping of all asset filenames to their corresponding
// output file so that tools can pick it up without having to parse
// `index.html`
// - "entrypoints" key: Array of files which are included in `index.html`,
// can be used to reconstruct the HTML if necessary
new ManifestPlugin({ fileName: 'asset-manifest.json', publicPath: publicPath, generate: (seed, files, entrypoints) => { const manifestFiles = files.reduce((manifest, file) => { manifest[file.name] = file.path; return manifest; }, seed); const entrypointFiles = entrypoints.main.filter( fileName => !fileName.endsWith('.map') );
return { files: manifestFiles, entrypoints: entrypointFiles, }; }, }), // 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, };};
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