diff --git a/packages/react-scripts/config/paths.js b/packages/react-scripts/config/paths.js index e5a3e0b5374..b59f41e80a6 100644 --- a/packages/react-scripts/config/paths.js +++ b/packages/react-scripts/config/paths.js @@ -75,6 +75,7 @@ const resolveModule = (resolveFn, filePath) => { // config after eject: we're in ./config/ module.exports = { + reactConfig: resolveApp('react.config.js'), dotenv: resolveApp('.env'), appPath: resolveApp('.'), appBuild: resolveApp('build'), @@ -98,6 +99,7 @@ const resolveOwn = relativePath => path.resolve(__dirname, '..', relativePath); // config before eject: we're in ./node_modules/react-scripts/config/ module.exports = { + reactConfig: resolveApp('react.config.js'), dotenv: resolveApp('.env'), appPath: resolveApp('.'), appBuild: resolveApp('build'), @@ -133,6 +135,7 @@ if ( __dirname.indexOf(path.join('packages', 'react-scripts', 'config')) !== -1 ) { module.exports = { + reactConfig: resolveApp('react.config.js'), dotenv: resolveOwn('template/.env'), appPath: resolveApp('.'), appBuild: resolveOwn('../../build'), diff --git a/packages/react-scripts/config/webpack.config.js b/packages/react-scripts/config/webpack.config.js index 074bb0d6d5f..8ed2839933d 100644 --- a/packages/react-scripts/config/webpack.config.js +++ b/packages/react-scripts/config/webpack.config.js @@ -11,6 +11,7 @@ const fs = require('fs'); const path = require('path'); const webpack = require('webpack'); +const WebpackChain = require('webpack-chain'); const resolve = require('resolve'); const PnpWebpackPlugin = require('pnp-webpack-plugin'); const HtmlWebpackPlugin = require('html-webpack-plugin'); @@ -90,653 +91,741 @@ module.exports = function(webpackEnv) { 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: '../../' } : {}, + const injectStyleLoaders = (rule, cssOptions, preProcessor) => { + rule.when( + isEnvDevelopment, + rule => { + rule.use('style').loader(require.resolve('style-loader')); }, - { - 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(), - ], + rule => { + rule + .use('cssExtract') + .loader(MiniCssExtractPlugin.loader) + .options(shouldUseRelativeAssetPaths ? { publicPath: '../../' } : {}); + } + ); + + rule + .use('css') + .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 + rule + .use('postcss') + .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, + }); + + rule.when(preProcessor, rule => { + rule + .use('resolveUrl') + .loader(require.resolve('resolve-url-loader')) + .options({ 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; + }); + + rule + .use(preProcessor) + .loader(require.resolve(preProcessor)) + .options({ + sourceMap: true, + }); + }); }; - return { - mode: isEnvProduction ? 'production' : isEnvDevelopment && 'development', + const config = new WebpackChain(); + + // Turn off performance processing because we utilize + // our own hints via the FileSizeReporter + config.performance + .hints(false) + .maxEntrypointSize(Infinity) + .maxAssetSize(Infinity); + + // 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. + config.node.merge({ + module: 'empty', + dgram: 'empty', + dns: 'mock', + fs: 'empty', + http2: 'empty', + net: 'empty', + tls: 'empty', + child_process: 'empty', + }); + + config + .mode(webpackEnv) // 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 - parallel: true, - // 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, + .bail(isEnvProduction) + .when( + isEnvProduction && shouldUseSourceMap, + config => config.devtool('source-map'), + config => config.devtool('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. + config + .entry('main') + // 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'), + .when(isEnvDevelopment, entry => + entry.add(require.resolve('react-dev-utils/webpackHotDevClient')) + ) + // Finally, this is your app's code: + // 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. + .add(paths.appIndexJs); + + config.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. + .when( + isEnvProduction, + output => output.filename('static/js/[name].[contenthash:8].js'), + output => output.filename('static/js/bundle.js') + ) + + // FIXME: https://github.com/neutrinojs/webpack-chain/issues/205 + // TODO: remove this when upgrading to webpack 5 + // .futureEmitAssets(true) + + // There are also additional JS chunk files if you use code splitting. + .when( + isEnvProduction, + output => + output.chunkFilename('static/js/[name].[contenthash:8].chunk.js'), + output => output.chunkFilename('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) + .when( + isEnvProduction, + output => + output.devtoolModuleFilenameTemplate(info => + path + .relative(paths.appSrc, info.absoluteResourcePath) + .replace(/\\/g, '/') + ), + output => + output.devtoolModuleFilenameTemplate(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'); + + config.optimization + .minimize(isEnvProduction) + // 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-${entrypoint.name}`, + }) + // Automatically split vendor and commons + // https://twitter.com/wSokra/status/969633336732905474 + // https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366 + .splitChunks({ + chunks: 'all', + name: false, + }); + + config.optimization.minimizer('terser').use(TerserPlugin, [ + { + terserOptions: { + parse: { + // We want terser to parse ecma 8 code. However, we don't want it + // to apply any minification steps that turns valid ecma 5 code + // into invalid ecma 5 code. This is why the 'compress' and 'output' + // sections only apply transformations that are ecma 5 safe + // https://github.com/facebook/create-react-app/pull/4234 + ecma: 8, + }, + compress: { + ecma: 5, + warnings: false, + // Disabled because of an issue with Uglify breaking seemingly valid code: + // https://github.com/facebook/create-react-app/issues/2376 + // Pending further investigation: + // https://github.com/mishoo/UglifyJS2/issues/2011 + comparisons: false, + // Disabled because of an issue with Terser breaking valid code: + // https://github.com/facebook/create-react-app/issues/5250 + // Pending further investigation: + // https://github.com/terser-js/terser/issues/120 + inline: 2, + }, + mangle: { + safari10: true, + }, + // Added for profiling in devtools + keep_classnames: isEnvProductionProfile, + keep_fnames: isEnvProductionProfile, + output: { + ecma: 5, + comments: false, + // Turned on because emoji and regex is not minified properly using default + // https://github.com/facebook/create-react-app/issues/2488 + ascii_only: true, + }, }, - // Keep the runtime chunk separated to enable long term caching - // https://twitter.com/wSokra/status/969679223278505985 - // https://github.com/facebook/create-react-app/issues/5358 - runtimeChunk: { - name: entrypoint => `runtime-${entrypoint.name}`, + // 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, + }, + ]); + + config.optimization.minimizer('optimizeCSS').use(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, }, }, - 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 || [] + ]); + + // 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 + config.resolve.modules.add('node_modules').add(paths.appNodeModules); + + (modules.additionalModulePaths || []).map(modPath => + config.resolve.modules.add(modPath) + ); + + config.resolve.alias + // Support React Native Web + // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/ + .set('react-native', 'react-native-web') + // Allows for better profiling with ReactDevTools + .when(isEnvProductionProfile, alias => + alias.merge({ + 'react-dom$': 'react-dom/profiling', + 'scheduler/tracing': 'scheduler/tracing-profiling', + }) + ) + .merge(modules.webpackAliases || {}); + + // These are the reasonable defaults supported by the Node ecosystem. + // We also include JSX as a common component filename extension to support + // some tools, although we do not recommend using it, see: + // https://github.com/facebook/create-react-app/issues/290 + // `web` extension prefixes have been added for better support + // for React Native Web. + paths.moduleFileExtensions + .map(ext => `.${ext}`) + .filter(ext => useTypeScript || !ext.includes('ts')) + .map(ext => config.resolve.extensions.add(ext)); + + // Adds support for installing with Plug'n'Play, leading to faster installs and adding + // guards against forgotten dependencies and such. + config.resolve.plugin('pnp').use(PnpWebpackPlugin); + + // Also related to Plug'n'Play, but this time it tells Webpack to load its loaders + // from the current package. + config.resolveLoader.plugin('pnp').use(PnpWebpackPlugin.moduleLoader(module)); + + // 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. + config.resolve + .plugin('modulescope') + .use(ModuleScopePlugin, [paths.appSrc, [paths.appPackageJson]]); + + // FIXME: https://github.com/neutrinojs/webpack-chain/issues/206 + // config.module.strictExportPresence(true); + + // Disable require.ensure as it's not a standard language feature. + config.module.rule('requireEnsure').parser({ requireEnsure: false }); + + // First, run the linter. + // It's important to do this before Babel processes the JS. + config.module + .rule('linter') + .test(/\.(js|mjs|jsx|ts|tsx)$/) + .include.add(paths.appSrc) + .end() + .enforce('pre') + .use('eslint') + .loader(require.resolve('eslint-loader')) + .options({ + cache: true, + formatter: require.resolve('react-dev-utils/eslintFormatter'), + eslintPath: require.resolve('eslint'), + resolvePluginsRelativeTo: __dirname, + // @remove-on-eject-begin + ignore: process.env.EXTEND_ESLINT === 'true', + baseConfig: (() => { + // We allow overriding the config only if the env variable is set + if (process.env.EXTEND_ESLINT === 'true') { + const eslintCli = new eslint.CLIEngine(); + let eslintConfig; + try { + eslintConfig = eslintCli.getConfigForFile(paths.appIndexJs); + } catch (e) { + console.error(e); + process.exit(1); + } + return eslintConfig; + } else { + return { + extends: [require.resolve('eslint-config-react-app')], + }; + } + })(), + useEslintrc: false, + // @remove-on-eject-end + }); + + // "oneOf" will traverse all following loaders until one will + // match the requirements. When no loader matches it will fall + // back to the "file" loader at the end of the loader list. + + // "url" loader works like "file" loader except that it embeds assets + // smaller than specified limit in bytes as data URLs to avoid requests. + // A missing `test` is equivalent to a match. + config.module + .rule('compiler') + .oneOf('url') + .test([/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/]) + .use('url') + .loader(require.resolve('url-loader')) + .options({ + limit: imageInlineSizeLimit, + name: 'static/media/[name].[hash:8].[ext]', + }); + + // Process application JS with Babel. + // The preset includes JSX, Flow, TypeScript, and some ESnext features. + config.module + .rule('compiler') + .oneOf('babel') + .test(/\.(js|mjs|jsx|ts|tsx)$/) + .include.add(paths.appSrc) + .end() + .use('babel') + .loader(require.resolve('babel-loader')) + .options({ + customize: require.resolve('babel-preset-react-app/webpack-overrides'), + // @remove-on-eject-begin + babelrc: false, + configFile: false, + presets: [require.resolve('babel-preset-react-app')], + // Make sure we have a unique cache identifier, erring on the + // side of caution. + // We remove this when the user ejects because the default + // is sane and uses Babel options. Instead of options, we use + // the react-scripts and babel-preset-react-app versions. + cacheIdentifier: getCacheIdentifier( + isEnvProduction ? 'production' : isEnvDevelopment && 'development', + [ + 'babel-plugin-named-asset-import', + 'babel-preset-react-app', + 'react-dev-utils', + 'react-scripts', + ] ), - // 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 || {}), - }, + // @remove-on-eject-end 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]), + [ + require.resolve('babel-plugin-named-asset-import'), + { + loaderMap: { + svg: { + ReactComponent: '@svgr/webpack?-svgo,+titleProp,+ref![path]', + }, + }, + }, + ], ], - }, - 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), + // 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. + config.module + .rule('compiler') + .oneOf('babelDeps') + .test(/\.(js|mjs)$/) + .exclude.add(/@babel(?:\/|\\{1,2})runtime/) + .end() + .use('babel') + .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, + // @remove-on-eject-begin + cacheIdentifier: getCacheIdentifier( + isEnvProduction ? 'production' : isEnvDevelopment && 'development', + [ + 'babel-plugin-named-asset-import', + 'babel-preset-react-app', + 'react-dev-utils', + 'react-scripts', + ] + ), + // @remove-on-eject-end + // Babel sourcemaps are needed for debugging into node_modules + // code. Without the options below, debuggers like VSCode + // show incorrect code and set breakpoints on the wrong lines. + sourceMaps: shouldUseSourceMap, + inputSourceMap: shouldUseSourceMap, + }); + + // Adds support for CSS Modules (https://github.com/css-modules/css-modules) + // using the extension .module.css + config.module + .rule('compiler') + .oneOf('cssModules') + .test(cssModuleRegex); + + injectStyleLoaders(config.module.rule('compiler').oneOf('cssModules'), { + importLoaders: 1, + sourceMap: isEnvProduction && shouldUseSourceMap, + modules: true, + getLocalIdent: getCSSModuleLocalIdent, + }); + + // "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