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Configuration

webpack is fed via a configuration object. It is passed in one of two ways depending on how you are using webpack: through the terminal or via Node.js. All the available configuration options are specified below.

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Notice that throughout the configuration we use Node's built-in path module and prefix it with the __dirname global. This prevents file path issues between operating systems and allows relative paths to work as expected. See this section for more info on POSIX vs. Windows paths.

Options

Click on the name of each option in the configuration code below to jump to the detailed documentation. Also note that the items with arrows can be expanded to show more examples and, in some cases, more advanced configuration.

const path = require('path');

module.exports = {
entry: "./app/entry", // string | object | array entry: ["./app/entry1", "./app/entry2"], entry: { a: "./app/entry-a", b: ["./app/entry-b1", "./app/entry-b2"] },
// Here the application starts executing // and webpack starts bundling output: { // options related to how webpack emits results path: path.resolve(__dirname, "dist"), // string // the target directory for all output files // must be an absolute path (use the Node.js path module)
filename: "bundle.js", // string filename: "[name].js", // for multiple entry points filename: "[chunkhash].js", // for long term caching
// the filename template for entry chunks
publicPath: "/assets/", // string publicPath: "", publicPath: "https://cdn.example.com/",
// the url to the output directory resolved relative to the HTML page library: "MyLibrary", // string, // the name of the exported library
libraryTarget: "umd", // universal module definition libraryTarget: "umd2", // universal module definition libraryTarget: "commonjs2", // exported with module.exports libraryTarget: "commonjs", // exported as properties to exports libraryTarget: "amd", // defined with AMD defined method libraryTarget: "this", // property set on this libraryTarget: "var", // variable defined in root scope libraryTarget: "assign", // blind assignment libraryTarget: "window", // property set to window object libraryTarget: "global", // property set to global object libraryTarget: "jsonp", // jsonp wrapper
// the type of the exported library
/* Advanced output configuration (click to show) */ pathinfo: true, // boolean // include useful path info about modules, exports, requests, etc. into the generated code chunkFilename: "[id].js", chunkFilename: "[chunkhash].js", // for long term caching // the filename template for additional chunks jsonpFunction: "myWebpackJsonp", // string // name of the JSONP function used to load chunks sourceMapFilename: "[file].map", // string sourceMapFilename: "sourcemaps/[file].map", // string // the filename template of the source map location devtoolModuleFilenameTemplate: "webpack:///[resource-path]", // string // the name template for modules in a devtool devtoolFallbackModuleFilenameTemplate: "webpack:///[resource-path]?[hash]", // string // the name template for modules in a devtool (used for conflicts) umdNamedDefine: true, // boolean // use a named AMD module in UMD library crossOriginLoading: "use-credentials", // enum crossOriginLoading: "anonymous", crossOriginLoading: false, // specifies how cross origin request are issued by the runtime
/* Expert output configuration (on own risk) */ devtoolLineToLine: { test: /\.jsx$/ }, // use a simple 1:1 mapped SourceMaps for these modules (faster) hotUpdateMainFilename: "[hash].hot-update.json", // string // filename template for HMR manifest hotUpdateChunkFilename: "[id].[hash].hot-update.js", // string // filename template for HMR chunks sourcePrefix: "\t", // string // prefix module sources in bundle for better readablitity
}, module: { // configuration regarding modules rules: [ // rules for modules (configure loaders, parser options, etc.) { test: /\.jsx?$/, include: [ path.resolve(__dirname, "app") ], exclude: [ path.resolve(__dirname, "app/demo-files") ], // these are matching conditions, each accepting a regular expression or string // test and include have the same behavior, both must be matched // exclude must not be matched (takes preferrence over test and include) // Best practices: // - Use RegExp only in test and for filename matching // - Use arrays of absolute paths in include and exclude // - Try to avoid exclude and prefer include issuer: { test, include, exclude }, // conditions for the issuer (the origin of the import) enforce: "pre", enforce: "post", // flags to apply these rules, even if they are overridden (advanced option) loader: "babel-loader", // the loader which should be applied, it'll be resolved relative to the context // -loader suffix is no longer optional in webpack2 for clarity reasons // see webpack 1 upgrade guide options: { presets: ["es2015"] }, // options for the loader }, { test: "\.html$", use: [ // apply multiple loaders and options "htmllint-loader", { loader: "html-loader", options: { /* ... */ } } ] }, { oneOf: [ /* rules */ ] }, // only use one of these nested rules { rules: [ /* rules */ ] }, // use all of these nested rules (combine with conditions to be useful) { resource: { and: [ /* conditions */ ] } }, // matches only if all conditions are matched { resource: { or: [ /* conditions */ ] } }, { resource: [ /* conditions */ ] }, // matches if any condition is matched (default for arrays) { resource: { not: /* condition */ } } // matches if the condition is not matched ],
/* Advanced module configuration (click to show) */ noParse: [ /special-library\.js$/ ], // do not parse this module unknownContextRequest: ".", unknownContextRecursive: true, unknownContextRegExp: /^\.\/.*$/, unknownContextCritical: true, exprContextRequest: ".", exprContextRegExp: /^\.\/.*$/, exprContextRecursive: true, exprContextCritical: true, wrappedContextRegExp: /.*/, wrappedContextRecursive: true, wrappedContextCritical: false, // specifies default behavior for dynamic requests
}, resolve: { // options for resolving module requests // (does not apply to resolving to loaders) modules: [ "node_modules", path.resolve(__dirname, "app") ], // directories where to look for modules extensions: [".js", ".json", ".jsx", ".css"], // extensions that are used alias: { // a list of module name aliases "module": "new-module", // alias "module" -> "new-module" and "module/path/file" -> "new-module/path/file" "only-module$": "new-module", // alias "only-module" -> "new-module", but not "module/path/file" -> "new-module/path/file" "module": path.resolve(__dirname, "app/third/module.js"), // alias "module" -> "./app/third/module.js" and "module/file" results in error // modules aliases are imported relative to the current context },
/* alternative alias syntax (click to show) */ alias: [ { name: "module", // the old request alias: "new-module", // the new request onlyModule: true // if true only "module" is aliased // if false "module/inner/path" is also aliased } ],
/* Advanced resolve configuration (click to show) */ symlinks: true, // follow symlinks to new location descriptionFiles: ["package.json"], // files that are read for package description mainFields: ["main"], // properties that are read from description file // when a folder is requested aliasFields: ["browser"], // properites that are read from description file // to alias requests in this package enforceExtension: false, // if true request must not include an extensions // if false request may already include an extension moduleExtensions: ["-module"], enforceModuleExtension: false, // like extensions/enforceExtension but for module names instead of files unsafeCache: true, unsafeCache: {}, // enables caching for resolved requests // this is unsafe as folder structure may change // but performance improvement is really big cachePredicate: (path, request) => true, // predicate function which selects requests for caching plugins: [ // ... ] // additional plugins applied to the resolver
}, performance: {
hints: "warning", // enum hints: "error", // emit errors for perf hints hints: false, // turn off perf hints
maxAssetSize: 200000, // int (in bytes), maxEntrypointSize: 400000, // int (in bytes) assetFilter: function(assetFilename) { // Function predicate that provides asset filenames return assetFilename.endsWith('.css') || assetFilename.endsWith('.js'); } },
devtool: "source-map", // enum devtool: "inline-source-map", // inlines SourceMap into original file devtool: "eval-source-map", // inlines SourceMap per module devtool: "hidden-source-map", // SourceMap without reference in original file devtool: "cheap-source-map", // cheap-variant of SourceMap without module mappings devtool: "cheap-module-source-map", // cheap-variant of SourceMap with module mappings devtool: "eval", // no SourceMap, but named modules. Fastest at the expense of detail.
// enhance debugging by adding meta info for the browser devtools // source-map most detailed at the expense of build speed. context: __dirname, // string (absolute path!) // the home directory for webpack // the entry and module.rules.loader option // is resolved relative to this directory
target: "web", // enum target: "webworker", // WebWorker target: "node", // Node.js via require target: "async-node", // Node.js via fs and vm target: "node-webkit", // nw.js target: "electron-main", // electron, main process target: "electron-renderer", // electron, renderer process target: (compiler) => { /* ... */ }, // custom
// the environment in which the bundle should run // changes chunk loading behavior and available modules
externals: ["react", /^@angular\//], externals: "react", // string (exact match) externals: /^[a-z\-]+($|\/)/, // Regex externals: { // object angular: "this angular", // this["angular"] react: { // UMD commonjs: "react", commonjs2: "react", amd: "react", root: "React" } }, externals: (request) => { /* ... */ return "commonjs " + request }
// Don't follow/bundle these modules, but request them at runtime from the environment
stats: "errors-only", stats: { //object assets: true, colors: true, errors: true, errorDetails: true, hash: true, // ... },
// lets you precisely control what bundle information gets displayed devServer: { proxy: { // proxy URLs to backend development server '/api': 'http://localhost:3000' }, contentBase: path.join(__dirname, 'public'), // boolean | string | array, static file location compress: true, // enable gzip compression historyApiFallback: true, // true for index.html upon 404, object for multiple paths hot: true, // hot module replacement. Depends on HotModuleReplacementPlugin https: false, // true for self-signed, object for cert authority noInfo: true, // only errors & warns on hot reload // ... }, plugins: [ // ... ], // list of additional plugins
/* Advanced configuration (click to show) */ resolveLoader: { /* same as resolve */ } // separate resolve options for loaders profile: true, // boolean // capture timing information bail: true, //boolean // fail out on the first error instead of tolerating it. cache: false, // boolean // disable/enable caching watch: true, // boolean // enables watching watchOptions: { aggregateTimeout: 1000, // in ms // aggregates multiple changes to a single rebuild poll: true, poll: 500, // intervall in ms // enables polling mode for watching // must be used on filesystems that doesn't notify on change // i. e. nfs shares }, node: { // Polyfills and mocks to run Node.js- // environment code in non-Node environments. console: false, // boolean | "mock" global: true, // boolean | "mock" process: true, // boolean __filename: "mock", // boolean | "mock" __dirname: "mock", // boolean | "mock" Buffer: true, // boolean | "mock" setImmediate: true // boolean | "mock" | "empty" }, recordsPath: path.resolve(__dirname, "build/records.json"), recordsInputPath: path.resolve(__dirname, "build/records.json"), recordsOutputPath: path.resolve(__dirname, "build/records.json"), // TODO
}

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