UglifyJS2 VS how-to-optimize-momentjs-with-webpack

UglifyJs

// 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: Object.assign( {}, shouldUseRelativeAssetPaths ? { publicPath: '../../' } : undefined ), }, { 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, }), ], sourceMap: isEnvProduction && shouldUseSourceMap, }, }, ].filter(Boolean); if (preProcessor) { loaders.push({ loader: require.resolve(preProcessor), options: { sourceMap: isEnvProduction && shouldUseSourceMap, }, }); } 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), externals: { // Don't bundle react or react-dom react: { commonjs: 'react', commonjs2: 'react', amd: 'React', root: 'React', }, 'react-dom': { commonjs: 'react-dom', commonjs2: 'react-dom', amd: 'ReactDOM', root: 'ReactDOM', }, }, 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].js' : isEnvDevelopment && 'static/js/bundle.js', // There are also additional JS chunk files if you use code splitting. chunkFilename: isEnvProduction ? 'static/js/[name].[chunkhash: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, '/')), libraryTarget: 'commonjs2', 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 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, }), // 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 // Keep the runtime chunk separated to enable long term caching // https://twitter.com/wSokra/status/969679223278505985 runtimeChunk: 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'].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 => `.${ext}`) .filter(ext => useTypeScript || !ext.includes('ts')), alias: { // Support React Native Web // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/ 'react-native': 'react-native-web', }, plugins: [ // Adds support for installing with Plug'n'Play, leading to faster installs and adding // guards against forgotten dependencies and such. PnpWebpackPlugin, // Prevents users from importing files from outside of src/ (or node\_modules/). // This often causes confusion because we only process files within src/ with babel. // To fix this, we prevent you from importing files out of src/ -- if you'd like to, // please link the files into your node\_modules/ and let module-resolution kick in. // Make sure your source files are compiled, as they will not be processed in any way. new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]), ], }, resolveLoader: { plugins: [ // Also related to Plug'n'Play, but this time it tells Webpack to load its loaders // from the current package. PnpWebpackPlugin.moduleLoader(module), ], }, module: { strictExportPresence: true, rules: [ // Disable require.ensure as it's not a standard language feature. { parser: { requireEnsure: false } }, // First, run the linter. // It's important to do this before Babel processes the JS. { test: /\.(js|mjs|jsx)$/, 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: [ // "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: 10000, 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)$/, include: paths.appSrc, loader: require.resolve('babel-loader'), options: { customize: require.resolve( 'babel-preset-react-app/webpack-overrides' ), plugins: [ [ require.resolve('babel-plugin-named-asset-import'), { loaderMap: { svg: { ReactComponent: '@svgr/webpack?-prettier,-svgo![path]', }, }, }, ], ], // This is a feature of `babel-loader` for webpack (not Babel itself). // It enables caching results in ./node\_modules/.cache/babel-loader/ // directory for faster rebuilds. cacheDirectory: true, cacheCompression: isEnvProduction, compact: isEnvProduction, }, }, // Process any JS outside of the app with Babel. // Unlike the application JS, we only compile the standard ES features. { test: /\.(js|mjs)$/, 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, 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, }, }, // "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 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 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. 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].css', chunkFilename: 'static/css/[name].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, }), // 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 useTypeScript && new ForkTsCheckerWebpackPlugin({ typescript: resolve.sync('typescript', { basedir: paths.appNodeModules, }), async: false, checkSyntacticErrors: true, tsconfig: paths.appTsConfig, compilerOptions: { module: 'esnext', moduleResolution: 'node', resolveJsonModule: true, isolatedModules: true, noEmit: true, jsx: 'preserve', }, reportFiles: [ '**', '!**/*.json', '!**/\_\_tests\_\_/**', '!**/?(*.)(spec|test).*', '!**/src/setupProxy.*', '!**/src/setupTests.*', ], watch: paths.appSrc, silent: true, formatter: typescriptFormatter, }), ].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: { dgram: 'empty', fs: 'empty', net: 'empty', tls: 'empty', child\_process: 'empty', }, // Turn off performance processing because we utilize // our own hints via the FileSizeReporter performance: false, };}; </code></p> <p>Answer link : <a href="https://codehunter.cc/a/reactjs/typeerror-cannot-read-property-webpackjsonp-of-undefined">https://codehunter.cc/a/reactjs/typeerror-cannot-read-property-webpackjsonp-of-undefined</a></p> </div><!-- SC_ON -->

'use strict';const autoprefixer = require('autoprefixer');const path = require('path');const webpack = require('webpack');const HtmlWebpackPlugin = require('html-webpack-plugin');const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');const eslintFormatter = require('react-dev-utils/eslintFormatter');const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');const getClientEnvironment = require('./env');const paths = require('./paths');const ExtractTextPlugin = require('extract-text-webpack-plugin');// Webpack uses `publicPath` to determine where the app is being served from.// In development, we always serve from the root. This makes config easier.const 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_PATH%/xyz looks better than %PUBLIC_PATH%xyz.const publicUrl = '';// Get environment variables to inject into our app.const env = getClientEnvironment(publicUrl);// This is the development configuration.// It is focused on developer experience and fast rebuilds.// The production configuration is different and lives in a separate file.module.exports = { // You may want 'eval' instead if you prefer to see the compiled output in DevTools. // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343. 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. // The first two entry points enable "hot" CSS and auto-refreshes for JS. 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'), require.resolve('react-dev-utils/webpackHotDevClient'), // We ship a few polyfills by default: require.resolve('./polyfills'), // Errors should be considered fatal in development require.resolve('react-error-overlay'), // 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. ], output: { // Next line is not used in dev but WebpackDevServer crashes without it: path: paths.appBuild, // Add /* filename */ comments to generated require()s in the output. pathinfo: true, // This does not produce a real file. It's just the virtual path that is // served by WebpackDevServer in development. This is the JS bundle // containing code from all our entry points, and the Webpack runtime. filename: 'static/js/bundle.js', // There are also additional JS chunk files if you use code splitting. chunkFilename: 'static/js/[name].chunk.js', // This is the URL that app is served from. We use "/" in development. publicPath: publicPath, // Point sourcemap entries to original disk location (format as URL on Windows) devtoolModuleFilenameTemplate: info => path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'), }, 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/facebookincubator/create-react-app/issues/253 modules: ['node_modules', paths.appNodeModules].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/facebookincubator/create-react-app/issues/290 // `web` extension prefixes have been added for better support // for React Native Web. extensions: ['.web.js', '.js', '.json', '.web.jsx', '.jsx'], alias: { // Support React Native Web // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/ 'react-native': 'react-native-web', }, plugins: [ // 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), ], }, module: { strictExportPresence: true, rules: [ // TODO: Disable require.ensure as it's not a standard language feature. // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176. // { parser: { requireEnsure: false } }, // First, run the linter. // It's important to do this before Babel processes the JS. { test: /\.(js|jsx)$/, enforce: 'pre', use: [ { options: { formatter: eslintFormatter, }, loader: require.resolve('eslint-loader'), }, ], include: paths.appSrc, }, // ** ADDING/UPDATING LOADERS ** // The "file" loader handles all assets unless explicitly excluded. // The `exclude` list *must* be updated with every change to loader extensions. // When adding a new loader, you must add its `test` // as a new entry in the `exclude` list for "file" loader. // "file" loader makes sure those assets get served by WebpackDevServer. // When you `import` an asset, you get its (virtual) filename. // In production, they would get copied to the `build` folder. { exclude: [ /\.html$/, /\.(js|jsx)$/, /\.css$/, /\.json$/, /\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/, /\.scss$/ ], loader: require.resolve('file-loader'), options: { name: 'static/media/[name].[hash:8].[ext]', }, }, // "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: 10000, name: 'static/media/[name].[hash:8].[ext]', }, }, // Process JS with Babel. { test: /\.(js|jsx)$/, include: paths.appSrc, loader: require.resolve('babel-loader'), options: { // This is a feature of `babel-loader` for webpack (not Babel itself). // It enables caching results in ./node_modules/.cache/babel-loader/ // directory for faster rebuilds. cacheDirectory: true, }, }, // "postcss" loader applies autoprefixer to our CSS. // "css" loader resolves paths in CSS and adds assets as dependencies. // "style" loader turns CSS into JS modules that inject tags. // In production, we use a plugin to extract that CSS to a file, but // in development "style" loader enables hot editing of CSS. { test: /\.css$/, use: [ require.resolve('style-loader'), { loader: require.resolve('css-loader'), options: { importLoaders: 1, modules: true, localIdentName: "[name]__[local]___[hash:base64:5]" }, }, { loader: require.resolve('postcss-loader'), options: { // Necessary for external CSS imports to work // https://github.com/facebookincubator/create-react-app/issues/2677 ident: 'postcss', plugins: () => [ require('postcss-flexbugs-fixes'), autoprefixer({ browsers: [ '>1%', 'last 4 versions', 'Firefox ESR', 'not ie < 9', // React doesn't support IE8 anyway ], flexbox: 'no-2009', }), ], }, }, ], }, { test: /\.scss$/, use: ExtractTextPlugin.extract({ fallback:'style-loader', use: [ { loader: 'css-loader', q: { modules: true, sourcemap: true, importLoaders: 2, localIdentName: '[name]__[local]__[hash:base64:5]' } }, 'sass-loader' ] }), loaders: [ require.resolve('style-loader'), require.resolve('css-loader'), require.resolve('sass-loader') ] } // ** STOP ** Are you adding a new loader? // Remember to add the new extension(s) to the "file" loader exclusion list. ], }, plugins: [ // Makes some environment variables available in index.html. // The public URL is available as %PUBLIC_URL% in index.html, e.g.: // // In development, this will be an empty string. new InterpolateHtmlPlugin(env.raw), // Generates an `index.html` file with the injected. new HtmlWebpackPlugin({ inject: true, template: paths.appHtml, }), // Add module names to factory functions so they appear in browser profiler. new webpack.NamedModulesPlugin(), // Makes some environment variables available to the JS code, for example: // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`. new webpack.DefinePlugin(env.stringified), // This is necessary to emit hot updates (currently CSS only): 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/facebookincubator/create-react-app/issues/240 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/facebookincubator/create-react-app/issues/186 new WatchMissingNodeModulesPlugin(paths.appNodeModules), // 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$/), new ExtractTextPlugin({'styles.css'}), ], // 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: { dgram: 'empty', fs: 'empty', net: 'empty', tls: 'empty', }, // Turn off performance hints during development because we don't do any // splitting or minification in interest of speed. These warnings become // cumbersome. performance: { hints: false, },}; </code> Modal.js file :</p> <p><code> import React from "react";import ReactDOM from "react-dom";// import styles from "../css/popUpBox.css";import styles from "../css/modal.scss"; // ERROR HAPPENS HERE!! </code> ...file continues </p> <p>Package.json :</p> <p><code> { "name": "react-hackboard", "version": "0.1.0", "private": true, "dependencies": { "autoprefixer": "7.1.1", "babel-core": "6.25.0", "babel-eslint": "7.2.3", "babel-jest": "20.0.3", "babel-loader": "7.0.0", "babel-preset-react-app": "^3.0.1", "babel-runtime": "6.23.0", "case-sensitive-paths-webpack-plugin": "2.1.1", "chalk": "1.1.3", "css-loader": "0.28.4", "dotenv": "4.0.0", "eslint": "3.19.0", "eslint-config-react-app": "^1.0.5", "eslint-loader": "1.7.1", "eslint-plugin-flowtype": "2.34.0", "eslint-plugin-import": "2.2.0", "eslint-plugin-jsx-a11y": "5.0.3", "eslint-plugin-react": "7.1.0", "extract-text-webpack-plugin": "2.1.2", "file-loader": "0.11.2", "fs-extra": "3.0.1", "html-webpack-plugin": "2.29.0", "jest": "20.0.4", "node-sass": "^4.5.3", "object-assign": "4.1.1", "postcss-flexbugs-fixes": "3.0.0", "postcss-loader": "2.0.6", "promise": "7.1.1", "react": "^15.6.1", "react-dev-utils": "^3.0.2", "react-dom": "^15.6.1", "react-error-overlay": "^1.0.9", "react-redux": "^5.0.5", "redux": "^3.7.2", "redux-createreducer": "^2.0.0", "redux-thunk": "^2.2.0", "sass-loader": "^6.0.6", "style-loader": "0.18.2", "sw-precache-webpack-plugin": "0.11.3", "url-loader": "0.5.9", "webpack": "2.6.1", "webpack-dev-server": "2.5.0", "webpack-manifest-plugin": "1.1.0", "whatwg-fetch": "2.0.3" }, "scripts": { "start": "node scripts/start.js", "build": "node scripts/build.js", "test": "node scripts/test.js --env=jsdom" }, "jest": { "collectCoverageFrom": [ "src/**/*.{js,jsx}" ], "setupFiles": [ "<rootDir>/config/polyfills.js" ], "testMatch": [ "<rootDir>/src/**/__tests__/**/*.js?(x)", "<rootDir>/src/**/?(*.)(spec|test).js?(x)" ], "testEnvironment": "node", "testURL": "http://localhost", "transform": { "^.+\\.(js|jsx)$": "<rootDir>/node_modules/babel-jest", "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js", "^(?!.*\\.(js|jsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js" }, "transformIgnorePatterns": [ "[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$" ], "moduleNameMapper": { "^react-native$": "react-native-web" }, "moduleFileExtensions": [ "web.js", "js", "json", "web.jsx", "jsx" ] }, "babel": { "presets": [ "react-app" ] }, "eslintConfig": { "extends": "react-app" }, "devDependencies": { "node-sass": "^4.5.3", "sass-loader": "^6.0.6", "webpack": "^2.6.1" }} </code></p> <p>Answer link : <a href="https://codehunter.cc/a/reactjs/module-not-found-cant-resolve-style">https://codehunter.cc/a/reactjs/module-not-found-cant-resolve-style</a></p> </div><!-- SC_ON -->

const path = require("path");const webpack = require("webpack");const PnpWebpackPlugin = require("pnp-webpack-plugin");const HtmlWebpackPlugin = require("html-webpack-plugin");const CaseSensitivePathsPlugin = require("case-sensitive-paths- webpack-plugin");const InterpolateHtmlPlugin = require("react-dev- utils/InterpolateHtmlPlugin"); const WatchMissingNodeModulesPlugin = require("react-dev- utils/WatchMissingNodeModulesPlugin"); const ModuleScopePlugin = require("react-dev- utils/ModuleScopePlugin"); const getCSSModuleLocalIdent = require("react-dev- utils/getCSSModuleLocalIdent"); const getClientEnvironment = require("./env"); const paths = require("./paths"); const ManifestPlugin = require("webpack-manifest-plugin"); const ModuleNotFoundPlugin = require("react-dev- utils/ModuleNotFoundPlugin"); // Webpack uses `publicPath` to determine where the app is being served from. // In development, we always serve from the root. This makes config easier. //const 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_PATH%/xyz looks better than %PUBLIC_PATH%xyz. const publicPath = "http://localhost:3000/"; const publicUrl = "http://localhost:3000/"; // Get environment variables to inject into our app. const env = getClientEnvironment(publicUrl); const BundleTracker = require("webpack-bundle-tracker"); // style files regexes const cssRegex = /\.css$/; const cssModuleRegex = /\.module\.css$/; const sassRegex = /\.(scss|sass)$/; const sassModuleRegex = /\.module\.(scss|sass)$/; // common function to get style loaders const getStyleLoaders = (cssOptions, preProcessor) => { const loaders = [ 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 }) ] } } ]; if (preProcessor) { loaders.push(require.resolve(preProcessor)); } return loaders;}; // This is the development configuration. // It is focused on developer experience and fast rebuilds. // The production configuration is different and lives in a separate file. module.exports = { mode: "development", // You may want 'eval' instead if you prefer to see the compiled output in DevTools. // See the discussion in https://github.com/facebook/create-react-app/issues/343 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. 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'), require.resolve("react-dev-utils/webpackHotDevClient"), require.resolve("webpack-dev-server/client") + "? http://localhost:3000", require.resolve("webpack/hot/dev-server"), // 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. ], output: { // Add /* filename */ comments to generated require()s in the output. pathinfo: true, // This does not produce a real file. It's just the virtual path that is // served by WebpackDevServer in development. This is the JS bundle // containing code from all our entry points, and the Webpack runtime. filename: "static/js/bundle.js",// There are also additional JS chunk files if you use code splitting.chunkFilename: "static/js/[name].chunk.js",// This is the URL that app is served from. We use "/" in development.publicPath: publicPath,// Point sourcemap entries to original disk location (format as URL on Windows)devtoolModuleFilenameTemplate: info => path.resolve(info.absoluteResourcePath).replace(/\\/g, "/") }, optimization: { // 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-be739a861366splitChunks: { chunks: "all", name: false},minimize: false,// Keep the runtime chunk seperated 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/253modules: ["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: [".mjs", ".web.js", ".js", ".json", ".web.jsx", ".jsx"],alias: { // Support React Native Web // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/ "react-native": "react-native-web"},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 BundleTracker({ path: paths.statsRoot, filename: "webpack-stats.dev.json" }), 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)$/, enforce: "pre", use: [ { options: { formatter: require.resolve("react-dev-utils/eslintFormatter"), eslintPath: require.resolve("eslint") }, loader: require.resolve("eslint-loader") } ], include: paths.appSrc }, { // "oneOf" will traverse all following loaders until one will // match the requirements. When no loader matches it will fall // back to the "file" loader at the end of the loader list. oneOf: [ // "url" loader works like "file" loader except that it embeds assets // smaller than specified limit in bytes as data URLs to avoid requests. // A missing `test` is equivalent to a match. { test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/], loader: require.resolve("url-loader"), options: { limit: 10000, name: "static/media/[name].[hash:8].[ext]" } }, // Process application JS with Babel. // The preset includes JSX, Flow, and some ESnext features. { test: /\.(js|mjs|jsx)$/, 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?-prettier,-svgo![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, // Don't waste time on Gzipping the cache cacheCompression: false } }, // 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, // Don't waste time on Gzipping the cache 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 tags. // In production, we use a plugin 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 }) }, // Adds support for CSS Modules (https://github.com/css-modules/css-modules) // using the extension .module.css { test: cssModuleRegex, use: getStyleLoaders({ importLoaders: 1, modules: true, getLocalIdent: getCSSModuleLocalIdent }) }, // Opt-in support for SASS (using .scss or .sass extensions). // Chains the sass-loader with the css-loader and the style-loader // to immediately apply all styles to the DOM. // By default we support SASS Modules with the // extensions .module.scss or .module.sass { test: sassRegex, exclude: sassModuleRegex, use: getStyleLoaders({ importLoaders: 2 }, "sass-loader") }, // Adds support for CSS Modules, but using SASS // using the extension .module.scss or .module.sass { test: sassModuleRegex, use: getStyleLoaders( { importLoaders: 2, 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. { // 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)$/, /\.html$/, /\.json$/], loader: require.resolve("file-loader"), 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 injected.new HtmlWebpackPlugin({ inject: true, template: paths.appHtml}),// new InterpolateHtmlPlugin({// name: "xu"// }),// 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 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 === 'development') { ... }. See `./env.js`.new webpack.DefinePlugin(env.stringified),// This is necessary to emit hot updates (currently CSS only):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/240new 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/186new WatchMissingNodeModulesPlugin(paths.appNodeModules),// 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 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}) ], // 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: {dgram: "empty",fs: "empty",net: "empty",tls: "empty",child_process: "empty" }, // Turn off performance processing because we utilize // our own hints via the FileSizeReporter performance: false}; </code> start.js file: "use strict";</p> <p><code> // Do this as the first thing so that any code reading it knows the right env. process.env.BABEL_ENV = "development"; process.env.NODE_ENV = "development"; // Makes the script crash on unhandled rejections instead of silently // ignoring them. In the future, promise rejections that are not handled will // terminate the Node.js process with a non-zero exit code. process.on("unhandledRejection", err => { throw err; }); // Ensure environment variables are read. require("../config/env"); const fs = require("fs"); const chalk = require("chalk"); const webpack = require("webpack");const WebpackDevServer = require("webpack-dev-server");const clearConsole = require("react-dev-utils/clearConsole");const checkRequiredFiles = require("react-dev-utils/checkRequiredFiles");const { choosePort, createCompiler, prepareProxy, prepareUrls} = require("react-dev-utils/WebpackDevServerUtils"); const openBrowser = require("react-dev-utils/openBrowser"); const paths = require("../config/paths"); const config = require("../config/webpack.config.dev"); const createDevServerConfig = require("../config/webpackDevServer.config"); const useYarn = fs.existsSync(paths.yarnLockFile); const isInteractive = process.stdout.isTTY; // Warn and crash if required files are missing if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) { process.exit(1); } // Tools like Cloud9 rely on this. const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000; const HOST = process.env.HOST || "0.0.0.0"; if (process.env.HOST) { console.log( chalk.cyan( ` Attempting to bind to HOST environment variable: ${chalk.yellow( chalk.bold(process.env.HOST) )}` ) ); console.log( `If this was unintentional, check that you haven't mistakenly set it in your shell.` ); console.log( `Learn more here:` ); console.log();} // We require that you explictly set browsers and do not fall back to // browserslist defaults. const { checkBrowsers } = require("react-dev-utils/browsersHelper"); checkBrowsers(paths.appPath, isInteractive) .then(() => { // We attempt to use the default port but if it is busy, we offer the user to // run on a different port. `choosePort()` Promise resolves to the next free port. return choosePort(HOST, DEFAULT_PORT); }) .then(port => { if (port == null) { // We have not found a port. return; } const protocol = process.env.HTTPS === "true" ? "https" : "http";const appName = require(paths.appPackageJson).name;const urls = prepareUrls(protocol, HOST, port);// Create a webpack compiler that is configured with custom messages.const compiler = createCompiler(webpack, config, appName, urls, useYarn);// Load proxy configconst proxySetting = require(paths.appPackageJson).proxy;const proxyConfig = prepareProxy(proxySetting, paths.appPublic);// Serve webpack assets generated by the compiler over a web server.const serverConfig = createDevServerConfig( proxyConfig, urls.lanUrlForConfig);const devServer = new WebpackDevServer(compiler, serverConfig);// Launch WebpackDevServer.devServer.listen(port, HOST, err => { if (err) { return console.log(err); } if (isInteractive) { clearConsole(); } console.log(chalk.cyan("Starting the development server...\n")); openBrowser(urls.localUrlForBrowser);});["SIGINT", "SIGTERM"].forEach(function(sig) { process.on(sig, function() { devServer.close(); process.exit(); });}); }) .catch(err => { if (err && err.message) { console.log(err.message); } process.exit(1); }); </code> Error Stacktrace:</p> <p>```</p> <blockquote> <p><a href="mailto:[email protected]">[email protected]</a> start /usr/react_projects/project> node scripts/start.js Cannot read property 'tap' of undefinednpm ERR! code ELIFECYCLEnpm ERR! errno 1npm ERR! <a href="mailto:[email protected]">[email protected]</a> start: <code>node scripts/start.js</code>npm ERR! Exit status 1npm ERR! npm ERR! Failed at the <a href="mailto:[email protected]">[email protected]</a> start script.npm ERR! This is probably not a problem with npm. There is likely additional logging output above. ``` I don't understand why it is giving Cannot find property "tap" undefined. </p> </blockquote> <p>Answer link : <a href="https://codehunter.cc/a/reactjs/react-webpack-cannot-read-property-tap-of-undefined">https://codehunter.cc/a/reactjs/react-webpack-cannot-read-property-tap-of-undefined</a></p> </div><!-- SC_ON -->

// 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: Object.assign( {}, shouldUseRelativeAssetPaths ? { publicPath: '../../' } : undefined ), }, { 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, }), ], sourceMap: isEnvProduction && shouldUseSourceMap, }, }, ].filter(Boolean); if (preProcessor) { loaders.push({ loader: require.resolve(preProcessor), options: { sourceMap: isEnvProduction && shouldUseSourceMap, }, }); } 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), externals: { // Don't bundle react or react-dom react: { commonjs: 'react', commonjs2: 'react', amd: 'React', root: 'React', }, 'react-dom': { commonjs: 'react-dom', commonjs2: 'react-dom', amd: 'ReactDOM', root: 'ReactDOM', }, }, 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].js' : isEnvDevelopment && 'static/js/bundle.js', // There are also additional JS chunk files if you use code splitting. chunkFilename: isEnvProduction ? 'static/js/[name].[chunkhash: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, '/')), libraryTarget: 'commonjs2', 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 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, }), // 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 // Keep the runtime chunk separated to enable long term caching // https://twitter.com/wSokra/status/969679223278505985 runtimeChunk: 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'].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 => `.${ext}`) .filter(ext => useTypeScript || !ext.includes('ts')), alias: { // Support React Native Web // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/ 'react-native': 'react-native-web', }, plugins: [ // Adds support for installing with Plug'n'Play, leading to faster installs and adding // guards against forgotten dependencies and such. PnpWebpackPlugin, // Prevents users from importing files from outside of src/ (or node\_modules/). // This often causes confusion because we only process files within src/ with babel. // To fix this, we prevent you from importing files out of src/ -- if you'd like to, // please link the files into your node\_modules/ and let module-resolution kick in. // Make sure your source files are compiled, as they will not be processed in any way. new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]), ], }, resolveLoader: { plugins: [ // Also related to Plug'n'Play, but this time it tells Webpack to load its loaders // from the current package. PnpWebpackPlugin.moduleLoader(module), ], }, module: { strictExportPresence: true, rules: [ // Disable require.ensure as it's not a standard language feature. { parser: { requireEnsure: false } }, // First, run the linter. // It's important to do this before Babel processes the JS. { test: /\.(js|mjs|jsx)$/, 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: [ // "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: 10000, 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)$/, include: paths.appSrc, loader: require.resolve('babel-loader'), options: { customize: require.resolve( 'babel-preset-react-app/webpack-overrides' ), plugins: [ [ require.resolve('babel-plugin-named-asset-import'), { loaderMap: { svg: { ReactComponent: '@svgr/webpack?-prettier,-svgo![path]', }, }, }, ], ], // This is a feature of `babel-loader` for webpack (not Babel itself). // It enables caching results in ./node\_modules/.cache/babel-loader/ // directory for faster rebuilds. cacheDirectory: true, cacheCompression: isEnvProduction, compact: isEnvProduction, }, }, // Process any JS outside of the app with Babel. // Unlike the application JS, we only compile the standard ES features. { test: /\.(js|mjs)$/, 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, 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, }, }, // "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 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 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. 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].css', chunkFilename: 'static/css/[name].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, }), // 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 useTypeScript && new ForkTsCheckerWebpackPlugin({ typescript: resolve.sync('typescript', { basedir: paths.appNodeModules, }), async: false, checkSyntacticErrors: true, tsconfig: paths.appTsConfig, compilerOptions: { module: 'esnext', moduleResolution: 'node', resolveJsonModule: true, isolatedModules: true, noEmit: true, jsx: 'preserve', }, reportFiles: [ '**', '!**/*.json', '!**/\_\_tests\_\_/**', '!**/?(*.)(spec|test).*', '!**/src/setupProxy.*', '!**/src/setupTests.*', ], watch: paths.appSrc, silent: true, formatter: typescriptFormatter, }), ].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: { dgram: 'empty', fs: 'empty', net: 'empty', tls: 'empty', child\_process: 'empty', }, // Turn off performance processing because we utilize // our own hints via the FileSizeReporter performance: false, };}; </code></p> <p>Answer link : <a href="https://codehunter.cc/a/reactjs/typeerror-cannot-read-property-webpackjsonp-of-undefined">https://codehunter.cc/a/reactjs/typeerror-cannot-read-property-webpackjsonp-of-undefined</a></p> </div><!-- SC_ON -->