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<!DOCTYPE html><html lang="en" data-reactroot=""><head><meta charset="utf-8"/><meta name="theme-color" content="#2B3A42"/><meta name="viewport" content="width=device-width, initial-scale=1"/><title>DevServer | webpack</title><meta name="description" content="webpack is a module bundler. Its main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset."/><meta property="og:site_name" content="webpack"/><meta property="og:type" content="website"/><meta property="og:title" content="DevServer | webpack"/><meta property="og:description" name="description" content="webpack is a module bundler. Its main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset."/><meta property="og:image" content="/aad9d51e01a0dcc2caf5bee43dc8e647.svg"/><meta property="twitter:card" content="summary"/><meta property="twitter:site" content="@webpack"/><meta property="twitter:creator" content="@webpack"/><meta property="twitter:domain" content="https://webpack.js.org/"/><link rel="icon" type="image/x-icon" href="/bc3effb418df77da9e04825c48a58a49.ico"/><link rel="stylesheet" href="/c3bdf2a06d9967301c16.css"/><link rel="stylesheet" href="/00b4b8424f4141301d82.css"/><link rel="manifest" href="/manifest.json"/><link rel="canonical" href="https://webpack.js.org/configuration/dev-server/"/><meta name="mobile-web-app-capable" content="yes"/><link rel="icon" sizes="192x192" href="/icon_192x192.png"/><link rel="icon" sizes="512x512" href="/icon_512x512.png"/><meta name="apple-mobile-web-app-capable" content="yes"/><meta name="apple-mobile-web-app-status-bar-style" content="black"/><meta name="apple-mobile-web-app-title" content="webpack"/><link rel="apple-touch-icon-precomposed" href="/icon_180x180.png"/><link rel="mask-icon" href="/aad9d51e01a0dcc2caf5bee43dc8e647.svg" color="#465e69"/><meta name="msapplication-TileImage" content="/icon_150x150.png"/><meta name="msapplication-TileColor" content="#465e69"/></head><body><div id="root"><div class="site"><div class="site__header"><div class="notification-bar"><div class="container notification-bar__inner"><p>Sponsor webpack and get apparel from the <a href="https://webpack.threadless.com">official shop</a>! 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title="output.hotUpdateFunction"><a href="/configuration/output/#outputhotupdatefunction">output.hotUpdateFunction</a></li><li class="sidebar-item__anchor" title="output.hotUpdateMainFilename"><a href="/configuration/output/#outputhotupdatemainfilename">output.hotUpdateMainFilename</a></li><li class="sidebar-item__anchor" title="output.jsonpFunction"><a href="/configuration/output/#outputjsonpfunction">output.jsonpFunction</a></li><li class="sidebar-item__anchor" title="output.library"><a href="/configuration/output/#outputlibrary">output.library</a></li><li class="sidebar-item__anchor" title="output.libraryExport"><a href="/configuration/output/#outputlibraryexport">output.libraryExport</a></li><li class="sidebar-item__anchor" title="output.libraryTarget"><a href="/configuration/output/#outputlibrarytarget">output.libraryTarget</a></li><li class="sidebar-item__anchor" title="Expose a Variable"><a href="/configuration/output/#expose-a-variable">Expose a Variable</a></li><li class="sidebar-item__anchor" title="Expose Via Object Assignment"><a href="/configuration/output/#expose-via-object-assignment">Expose Via Object Assignment</a></li><li class="sidebar-item__anchor" title="Module Definition Systems"><a href="/configuration/output/#module-definition-systems">Module Definition Systems</a></li><li class="sidebar-item__anchor" title="Other Targets"><a href="/configuration/output/#other-targets">Other Targets</a></li><li class="sidebar-item__anchor" title="output.path"><a href="/configuration/output/#outputpath">output.path</a></li><li class="sidebar-item__anchor" title="output.pathinfo"><a href="/configuration/output/#outputpathinfo">output.pathinfo</a></li><li class="sidebar-item__anchor" title="output.publicPath"><a href="/configuration/output/#outputpublicpath">output.publicPath</a></li><li class="sidebar-item__anchor" title="output.sourceMapFilename"><a href="/configuration/output/#outputsourcemapfilename">output.sourceMapFilename</a></li><li class="sidebar-item__anchor" title="output.sourcePrefix"><a href="/configuration/output/#outputsourceprefix">output.sourcePrefix</a></li><li class="sidebar-item__anchor" title="output.strictModuleExceptionHandling"><a href="/configuration/output/#outputstrictmoduleexceptionhandling">output.strictModuleExceptionHandling</a></li><li class="sidebar-item__anchor" title="output.umdNamedDefine"><a href="/configuration/output/#outputumdnameddefine">output.umdNamedDefine</a></li><li class="sidebar-item__anchor" title="output.futureEmitAssets"><a href="/configuration/output/#outputfutureemitassets">output.futureEmitAssets</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/module/">Module</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="module.noParse"><a href="/configuration/module/#modulenoparse">module.noParse</a></li><li class="sidebar-item__anchor" title="module.rules"><a href="/configuration/module/#modulerules">module.rules</a></li><li class="sidebar-item__anchor" title="module.unsafeCache"><a href="/configuration/module/#moduleunsafecache">module.unsafeCache</a></li><li class="sidebar-item__anchor" title="Rule"><a href="/configuration/module/#rule">Rule</a></li><li class="sidebar-item__anchor" title="Rule Conditions"><a href="/configuration/module/#rule-conditions">Rule Conditions</a></li><li class="sidebar-item__anchor" title="Rule results"><a href="/configuration/module/#rule-results">Rule results</a></li><li class="sidebar-item__anchor" title="Nested rules"><a href="/configuration/module/#nested-rules">Nested rules</a></li><li class="sidebar-item__anchor" title="Rule.enforce"><a href="/configuration/module/#ruleenforce">Rule.enforce</a></li><li class="sidebar-item__anchor" title="Rule.exclude"><a href="/configuration/module/#ruleexclude">Rule.exclude</a></li><li class="sidebar-item__anchor" title="Rule.include"><a href="/configuration/module/#ruleinclude">Rule.include</a></li><li class="sidebar-item__anchor" title="Rule.issuer"><a href="/configuration/module/#ruleissuer">Rule.issuer</a></li><li class="sidebar-item__anchor" title="Rule.loader"><a href="/configuration/module/#ruleloader">Rule.loader</a></li><li class="sidebar-item__anchor" title="Rule.loaders"><a href="/configuration/module/#ruleloaders">Rule.loaders</a></li><li class="sidebar-item__anchor" title="Rule.oneOf"><a href="/configuration/module/#ruleoneof">Rule.oneOf</a></li><li class="sidebar-item__anchor" title="Rule.options"><a href="/configuration/module/#ruleoptions--rulequery">Rule.options</a></li><li class="sidebar-item__anchor" title="Rule.parser"><a href="/configuration/module/#ruleparser">Rule.parser</a></li><li class="sidebar-item__anchor" title="Rule.resource"><a href="/configuration/module/#ruleresource">Rule.resource</a></li><li class="sidebar-item__anchor" title="Rule.resourceQuery"><a href="/configuration/module/#ruleresourcequery">Rule.resourceQuery</a></li><li class="sidebar-item__anchor" title="Rule.rules"><a href="/configuration/module/#rulerules">Rule.rules</a></li><li class="sidebar-item__anchor" title="Rule.sideEffects"><a href="/configuration/module/#rulesideeffects">Rule.sideEffects</a></li><li class="sidebar-item__anchor" title="Rule.test"><a href="/configuration/module/#ruletest">Rule.test</a></li><li class="sidebar-item__anchor" title="Rule.type"><a href="/configuration/module/#ruletype">Rule.type</a></li><li class="sidebar-item__anchor" title="Rule.use"><a href="/configuration/module/#ruleuse">Rule.use</a></li><li class="sidebar-item__anchor" title="Rule.resolve"><a href="/configuration/module/#ruleresolve">Rule.resolve</a></li><li class="sidebar-item__anchor" title="Condition"><a href="/configuration/module/#condition">Condition</a></li><li class="sidebar-item__anchor" title="UseEntry"><a href="/configuration/module/#useentry">UseEntry</a></li><li class="sidebar-item__anchor" title="Module Contexts"><a href="/configuration/module/#module-contexts">Module Contexts</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/resolve/">Resolve</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="resolve"><a href="/configuration/resolve/#resolve">resolve</a></li><li class="sidebar-item__anchor" title="resolve.alias"><a href="/configuration/resolve/#resolvealias">resolve.alias</a></li><li class="sidebar-item__anchor" title="resolve.aliasFields"><a href="/configuration/resolve/#resolvealiasfields">resolve.aliasFields</a></li><li class="sidebar-item__anchor" title="resolve.cacheWithContext"><a href="/configuration/resolve/#resolvecachewithcontext">resolve.cacheWithContext</a></li><li class="sidebar-item__anchor" title="resolve.descriptionFiles"><a href="/configuration/resolve/#resolvedescriptionfiles">resolve.descriptionFiles</a></li><li class="sidebar-item__anchor" title="resolve.enforceExtension"><a href="/configuration/resolve/#resolveenforceextension">resolve.enforceExtension</a></li><li class="sidebar-item__anchor" title="resolve.enforceModuleExtension"><a href="/configuration/resolve/#resolveenforcemoduleextension">resolve.enforceModuleExtension</a></li><li class="sidebar-item__anchor" title="resolve.extensions"><a href="/configuration/resolve/#resolveextensions">resolve.extensions</a></li><li class="sidebar-item__anchor" title="resolve.mainFields"><a href="/configuration/resolve/#resolvemainfields">resolve.mainFields</a></li><li class="sidebar-item__anchor" title="resolve.mainFiles"><a href="/configuration/resolve/#resolvemainfiles">resolve.mainFiles</a></li><li class="sidebar-item__anchor" title="resolve.modules"><a href="/configuration/resolve/#resolvemodules">resolve.modules</a></li><li class="sidebar-item__anchor" title="resolve.unsafeCache"><a href="/configuration/resolve/#resolveunsafecache">resolve.unsafeCache</a></li><li class="sidebar-item__anchor" title="resolve.plugins"><a href="/configuration/resolve/#resolveplugins">resolve.plugins</a></li><li class="sidebar-item__anchor" title="resolve.symlinks"><a href="/configuration/resolve/#resolvesymlinks">resolve.symlinks</a></li><li class="sidebar-item__anchor" title="resolve.cachePredicate"><a href="/configuration/resolve/#resolvecachepredicate">resolve.cachePredicate</a></li><li class="sidebar-item__anchor" title="resolveLoader"><a href="/configuration/resolve/#resolveloader">resolveLoader</a></li><li class="sidebar-item__anchor" title="resolve.roots"><a href="/configuration/resolve/#resolveroots">resolve.roots</a></li><li class="sidebar-item__anchor" title="resolveLoader.moduleExtensions"><a href="/configuration/resolve/#resolveloadermoduleextensions">resolveLoader.moduleExtensions</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/optimization/">Optimization</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="optimization.minimize"><a href="/configuration/optimization/#optimizationminimize">optimization.minimize</a></li><li class="sidebar-item__anchor" title="optimization.minimizer"><a href="/configuration/optimization/#optimizationminimizer">optimization.minimizer</a></li><li class="sidebar-item__anchor" title="optimization.splitChunks"><a href="/configuration/optimization/#optimizationsplitchunks">optimization.splitChunks</a></li><li class="sidebar-item__anchor" title="optimization.runtimeChunk"><a href="/configuration/optimization/#optimizationruntimechunk">optimization.runtimeChunk</a></li><li class="sidebar-item__anchor" title="optimization.noEmitOnErrors"><a href="/configuration/optimization/#optimizationnoemitonerrors">optimization.noEmitOnErrors</a></li><li class="sidebar-item__anchor" title="optimization.namedModules"><a href="/configuration/optimization/#optimizationnamedmodules">optimization.namedModules</a></li><li class="sidebar-item__anchor" title="optimization.namedChunks"><a href="/configuration/optimization/#optimizationnamedchunks">optimization.namedChunks</a></li><li class="sidebar-item__anchor" title="optimization.moduleIds"><a href="/configuration/optimization/#optimizationmoduleids">optimization.moduleIds</a></li><li class="sidebar-item__anchor" title="optimization.chunkIds"><a href="/configuration/optimization/#optimizationchunkids">optimization.chunkIds</a></li><li class="sidebar-item__anchor" title="optimization.nodeEnv"><a href="/configuration/optimization/#optimizationnodeenv">optimization.nodeEnv</a></li><li class="sidebar-item__anchor" title="optimization.mangleWasmImports"><a href="/configuration/optimization/#optimizationmanglewasmimports">optimization.mangleWasmImports</a></li><li class="sidebar-item__anchor" title="optimization.removeAvailableModules"><a href="/configuration/optimization/#optimizationremoveavailablemodules">optimization.removeAvailableModules</a></li><li class="sidebar-item__anchor" title="optimization.removeEmptyChunks"><a href="/configuration/optimization/#optimizationremoveemptychunks">optimization.removeEmptyChunks</a></li><li class="sidebar-item__anchor" title="optimization.mergeDuplicateChunks"><a href="/configuration/optimization/#optimizationmergeduplicatechunks">optimization.mergeDuplicateChunks</a></li><li class="sidebar-item__anchor" title="optimization.flagIncludedChunks"><a href="/configuration/optimization/#optimizationflagincludedchunks">optimization.flagIncludedChunks</a></li><li class="sidebar-item__anchor" title="optimization.occurrenceOrder"><a href="/configuration/optimization/#optimizationoccurrenceorder">optimization.occurrenceOrder</a></li><li class="sidebar-item__anchor" title="optimization.providedExports"><a href="/configuration/optimization/#optimizationprovidedexports">optimization.providedExports</a></li><li class="sidebar-item__anchor" title="optimization.usedExports"><a href="/configuration/optimization/#optimizationusedexports">optimization.usedExports</a></li><li class="sidebar-item__anchor" title="optimization.concatenateModules"><a href="/configuration/optimization/#optimizationconcatenatemodules">optimization.concatenateModules</a></li><li class="sidebar-item__anchor" title="optimization.sideEffects"><a href="/configuration/optimization/#optimizationsideeffects">optimization.sideEffects</a></li><li class="sidebar-item__anchor" title="optimization.portableRecords"><a href="/configuration/optimization/#optimizationportablerecords">optimization.portableRecords</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/plugins/">Plugins</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="plugins"><a href="/configuration/plugins/#plugins">plugins</a></li></ul></div></div><div><div class="sidebar-item sidebar-item--open "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/dev-server/">DevServer</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="devServer"><a href="/configuration/dev-server/#devserver">devServer</a></li><li class="sidebar-item__anchor" title="devServer.after"><a href="/configuration/dev-server/#devserverafter">devServer.after</a></li><li class="sidebar-item__anchor" title="devServer.allowedHosts"><a href="/configuration/dev-server/#devserverallowedhosts">devServer.allowedHosts</a></li><li class="sidebar-item__anchor" title="devServer.before"><a href="/configuration/dev-server/#devserverbefore">devServer.before</a></li><li class="sidebar-item__anchor" title="devServer.bonjour"><a href="/configuration/dev-server/#devserverbonjour">devServer.bonjour</a></li><li class="sidebar-item__anchor" title="devServer.clientLogLevel"><a href="/configuration/dev-server/#devserverclientloglevel">devServer.clientLogLevel</a></li><li class="sidebar-item__anchor" title="devServer.color"><a href="/configuration/dev-server/#devservercolor---cli-only">devServer.color</a></li><li class="sidebar-item__anchor" title="devServer.compress"><a href="/configuration/dev-server/#devservercompress">devServer.compress</a></li><li class="sidebar-item__anchor" title="devServer.contentBase"><a href="/configuration/dev-server/#devservercontentbase">devServer.contentBase</a></li><li class="sidebar-item__anchor" title="devServer.disableHostCheck"><a href="/configuration/dev-server/#devserverdisablehostcheck">devServer.disableHostCheck</a></li><li class="sidebar-item__anchor" title="devServer.filename"><a href="/configuration/dev-server/#devserverfilename-">devServer.filename</a></li><li class="sidebar-item__anchor" title="devServer.headers"><a href="/configuration/dev-server/#devserverheaders-">devServer.headers</a></li><li class="sidebar-item__anchor" title="devServer.historyApiFallback"><a href="/configuration/dev-server/#devserverhistoryapifallback">devServer.historyApiFallback</a></li><li class="sidebar-item__anchor" title="devServer.host"><a href="/configuration/dev-server/#devserverhost">devServer.host</a></li><li class="sidebar-item__anchor" title="devServer.hot"><a href="/configuration/dev-server/#devserverhot">devServer.hot</a></li><li class="sidebar-item__anchor" title="devServer.hotOnly"><a href="/configuration/dev-server/#devserverhotonly">devServer.hotOnly</a></li><li class="sidebar-item__anchor" title="devServer.http2"><a href="/configuration/dev-server/#devserverhttp2">devServer.http2</a></li><li class="sidebar-item__anchor" title="devServer.https"><a href="/configuration/dev-server/#devserverhttps">devServer.https</a></li><li class="sidebar-item__anchor" title="devServer.index"><a href="/configuration/dev-server/#devserverindex">devServer.index</a></li><li class="sidebar-item__anchor" title="devServer.info"><a href="/configuration/dev-server/#devserverinfo---cli-only">devServer.info</a></li><li class="sidebar-item__anchor" title="devServer.injectClient"><a href="/configuration/dev-server/#devserverinjectclient">devServer.injectClient</a></li><li class="sidebar-item__anchor" title="devServer.injectHot"><a href="/configuration/dev-server/#devserverinjecthot">devServer.injectHot</a></li><li class="sidebar-item__anchor" title="devServer.inline"><a href="/configuration/dev-server/#devserverinline">devServer.inline</a></li><li class="sidebar-item__anchor" title="devServer.lazy"><a href="/configuration/dev-server/#devserverlazy-">devServer.lazy</a></li><li class="sidebar-item__anchor" title="devServer.liveReload"><a href="/configuration/dev-server/#devserverlivereload">devServer.liveReload</a></li><li class="sidebar-item__anchor" title="devServer.mimeTypes"><a href="/configuration/dev-server/#devservermimetypes-">devServer.mimeTypes</a></li><li class="sidebar-item__anchor" title="devServer.noInfo"><a href="/configuration/dev-server/#devservernoinfo-">devServer.noInfo</a></li><li class="sidebar-item__anchor" title="devServer.onListening"><a href="/configuration/dev-server/#devserveronlistening">devServer.onListening</a></li><li class="sidebar-item__anchor" title="devServer.open"><a href="/configuration/dev-server/#devserveropen">devServer.open</a></li><li class="sidebar-item__anchor" title="devServer.openPage"><a href="/configuration/dev-server/#devserveropenpage">devServer.openPage</a></li><li class="sidebar-item__anchor" title="devServer.overlay"><a href="/configuration/dev-server/#devserveroverlay">devServer.overlay</a></li><li class="sidebar-item__anchor" title="devServer.pfx"><a href="/configuration/dev-server/#devserverpfx">devServer.pfx</a></li><li class="sidebar-item__anchor" title="devServer.pfxPassphrase"><a href="/configuration/dev-server/#devserverpfxpassphrase">devServer.pfxPassphrase</a></li><li class="sidebar-item__anchor" title="devServer.port"><a href="/configuration/dev-server/#devserverport">devServer.port</a></li><li class="sidebar-item__anchor" title="devServer.proxy"><a href="/configuration/dev-server/#devserverproxy">devServer.proxy</a></li><li class="sidebar-item__anchor" title="devServer.progress"><a href="/configuration/dev-server/#devserverprogress---cli-only">devServer.progress</a></li><li class="sidebar-item__anchor" title="devServer.public"><a href="/configuration/dev-server/#devserverpublic">devServer.public</a></li><li class="sidebar-item__anchor" title="devServer.publicPath"><a href="/configuration/dev-server/#devserverpublicpath-">devServer.publicPath</a></li><li class="sidebar-item__anchor" title="devServer.quiet"><a href="/configuration/dev-server/#devserverquiet-">devServer.quiet</a></li><li class="sidebar-item__anchor" title="devServer.serveIndex"><a href="/configuration/dev-server/#devserverserveindex">devServer.serveIndex</a></li><li class="sidebar-item__anchor" title="devServer.setup"><a href="/configuration/dev-server/#devserversetup">devServer.setup</a></li><li class="sidebar-item__anchor" title="devServer.socket"><a href="/configuration/dev-server/#devserversocket">devServer.socket</a></li><li class="sidebar-item__anchor" title="devServer.sockHost"><a href="/configuration/dev-server/#devserversockhost">devServer.sockHost</a></li><li class="sidebar-item__anchor" title="devServer.sockPath"><a href="/configuration/dev-server/#devserversockpath">devServer.sockPath</a></li><li class="sidebar-item__anchor" title="devServer.sockPort"><a href="/configuration/dev-server/#devserversockport">devServer.sockPort</a></li><li class="sidebar-item__anchor" title="devServer.staticOptions"><a href="/configuration/dev-server/#devserverstaticoptions">devServer.staticOptions</a></li><li class="sidebar-item__anchor" title="devServer.stats"><a href="/configuration/dev-server/#devserverstats-">devServer.stats</a></li><li class="sidebar-item__anchor" title="devServer.stdin"><a href="/configuration/dev-server/#devserverstdin---cli-only">devServer.stdin</a></li><li class="sidebar-item__anchor" title="devServer.transportMode"><a href="/configuration/dev-server/#devservertransportmode">devServer.transportMode</a></li><li class="sidebar-item__anchor" title="devServer.transportMode.client"><a href="/configuration/dev-server/#devservertransportmodeclient">devServer.transportMode.client</a></li><li class="sidebar-item__anchor" title="devServer.transportMode.server"><a href="/configuration/dev-server/#devservertransportmodeserver">devServer.transportMode.server</a></li><li class="sidebar-item__anchor" title="devServer.useLocalIp"><a href="/configuration/dev-server/#devserveruselocalip">devServer.useLocalIp</a></li><li class="sidebar-item__anchor" title="devServer.watchContentBase"><a href="/configuration/dev-server/#devserverwatchcontentbase">devServer.watchContentBase</a></li><li class="sidebar-item__anchor" title="devServer.watchOptions"><a href="/configuration/dev-server/#devserverwatchoptions-">devServer.watchOptions</a></li><li class="sidebar-item__anchor" title="devServer.writeToDisk"><a href="/configuration/dev-server/#devserverwritetodisk-">devServer.writeToDisk</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/devtool/">Devtool</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="devtool"><a href="/configuration/devtool/#devtool">devtool</a></li><li class="sidebar-item__anchor" title="Qualities"><a href="/configuration/devtool/#qualities">Qualities</a></li><li class="sidebar-item__anchor" title="Development"><a href="/configuration/devtool/#development">Development</a></li><li class="sidebar-item__anchor" title="Special cases"><a href="/configuration/devtool/#special-cases">Special cases</a></li><li class="sidebar-item__anchor" title="Production"><a href="/configuration/devtool/#production">Production</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/target/">Target</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="target"><a href="/configuration/target/#target">target</a></li><li class="sidebar-item__anchor" title="string"><a href="/configuration/target/#string">string</a></li><li class="sidebar-item__anchor" title="function"><a href="/configuration/target/#function">function</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/watch/">Watch and WatchOptions</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="watch"><a href="/configuration/watch/#watch">watch</a></li><li class="sidebar-item__anchor" title="watchOptions"><a href="/configuration/watch/#watchoptions">watchOptions</a></li><li class="sidebar-item__anchor" title="watchOptions.aggregateTimeout"><a href="/configuration/watch/#watchoptionsaggregatetimeout">watchOptions.aggregateTimeout</a></li><li class="sidebar-item__anchor" title="watchOptions.ignored"><a href="/configuration/watch/#watchoptionsignored">watchOptions.ignored</a></li><li class="sidebar-item__anchor" title="watchOptions.poll"><a href="/configuration/watch/#watchoptionspoll">watchOptions.poll</a></li><li class="sidebar-item__anchor" title="info-verbosity"><a href="/configuration/watch/#info-verbosity">info-verbosity</a></li><li class="sidebar-item__anchor" title="Troubleshooting"><a href="/configuration/watch/#troubleshooting">Troubleshooting</a></li><li class="sidebar-item__anchor" title="Changes Seen But Not Processed"><a href="/configuration/watch/#changes-seen-but-not-processed">Changes Seen But Not Processed</a></li><li class="sidebar-item__anchor" title="Not Enough Watchers"><a href="/configuration/watch/#not-enough-watchers">Not Enough Watchers</a></li><li class="sidebar-item__anchor" title="macOS fsevents Bug"><a href="/configuration/watch/#macos-fsevents-bug">macOS fsevents Bug</a></li><li class="sidebar-item__anchor" title="Windows Paths"><a href="/configuration/watch/#windows-paths">Windows Paths</a></li><li class="sidebar-item__anchor" title="Vim"><a href="/configuration/watch/#vim">Vim</a></li><li class="sidebar-item__anchor" title="Saving in WebStorm"><a href="/configuration/watch/#saving-in-webstorm">Saving in WebStorm</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/externals/">Externals</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="externals"><a href="/configuration/externals/#externals">externals</a></li><li class="sidebar-item__anchor" title="string"><a href="/configuration/externals/#string">string</a></li><li class="sidebar-item__anchor" title="array"><a href="/configuration/externals/#array">array</a></li><li class="sidebar-item__anchor" title="object"><a href="/configuration/externals/#object">object</a></li><li class="sidebar-item__anchor" title="function"><a href="/configuration/externals/#function">function</a></li><li class="sidebar-item__anchor" title="regex"><a href="/configuration/externals/#regex">regex</a></li><li class="sidebar-item__anchor" title="Combining syntaxes"><a href="/configuration/externals/#combining-syntaxes">Combining syntaxes</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/performance/">Performance</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="performance"><a href="/configuration/performance/#performance">performance</a></li><li class="sidebar-item__anchor" title="performance.hints"><a href="/configuration/performance/#performancehints">performance.hints</a></li><li class="sidebar-item__anchor" title="performance.maxEntrypointSize"><a href="/configuration/performance/#performancemaxentrypointsize">performance.maxEntrypointSize</a></li><li class="sidebar-item__anchor" title="performance.maxAssetSize"><a href="/configuration/performance/#performancemaxassetsize">performance.maxAssetSize</a></li><li class="sidebar-item__anchor" title="performance.assetFilter"><a href="/configuration/performance/#performanceassetfilter">performance.assetFilter</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/node/">Node</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="node"><a href="/configuration/node/#node">node</a></li><li class="sidebar-item__anchor" title="node.console"><a href="/configuration/node/#nodeconsole">node.console</a></li><li class="sidebar-item__anchor" title="node.process"><a href="/configuration/node/#nodeprocess">node.process</a></li><li class="sidebar-item__anchor" title="node.global"><a href="/configuration/node/#nodeglobal">node.global</a></li><li class="sidebar-item__anchor" title="node.__filename"><a href="/configuration/node/#node__filename">node.__filename</a></li><li class="sidebar-item__anchor" title="node.__dirname"><a href="/configuration/node/#node__dirname">node.__dirname</a></li><li class="sidebar-item__anchor" title="node.Buffer"><a href="/configuration/node/#nodebuffer">node.Buffer</a></li><li class="sidebar-item__anchor" title="node.setImmediate"><a href="/configuration/node/#nodesetimmediate">node.setImmediate</a></li><li class="sidebar-item__anchor" title="Other node core libraries"><a href="/configuration/node/#other-node-core-libraries">Other node core libraries</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/stats/">Stats</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="stats"><a href="/configuration/stats/#stats">stats</a></li><li class="sidebar-item__anchor" title="stats.all"><a href="/configuration/stats/#statsall">stats.all</a></li><li class="sidebar-item__anchor" title="stats.assets"><a href="/configuration/stats/#statsassets">stats.assets</a></li><li class="sidebar-item__anchor" title="stats.assetsSort"><a href="/configuration/stats/#statsassetssort">stats.assetsSort</a></li><li class="sidebar-item__anchor" title="stats.builtAt"><a href="/configuration/stats/#statsbuiltat">stats.builtAt</a></li><li class="sidebar-item__anchor" title="stats.cached"><a href="/configuration/stats/#statscached">stats.cached</a></li><li class="sidebar-item__anchor" title="stats.cachedAssets"><a href="/configuration/stats/#statscachedassets">stats.cachedAssets</a></li><li class="sidebar-item__anchor" title="stats.children"><a href="/configuration/stats/#statschildren">stats.children</a></li><li class="sidebar-item__anchor" title="stats.chunks"><a href="/configuration/stats/#statschunks">stats.chunks</a></li><li class="sidebar-item__anchor" title="stats.chunkGroups"><a href="/configuration/stats/#statschunkgroups">stats.chunkGroups</a></li><li class="sidebar-item__anchor" title="stats.chunkModules"><a href="/configuration/stats/#statschunkmodules">stats.chunkModules</a></li><li class="sidebar-item__anchor" title="stats.chunkOrigins"><a href="/configuration/stats/#statschunkorigins">stats.chunkOrigins</a></li><li class="sidebar-item__anchor" title="stats.chunksSort"><a href="/configuration/stats/#statschunkssort">stats.chunksSort</a></li><li class="sidebar-item__anchor" title="stats.context"><a href="/configuration/stats/#statscontext">stats.context</a></li><li class="sidebar-item__anchor" title="stats.colors"><a href="/configuration/stats/#statscolors">stats.colors</a></li><li class="sidebar-item__anchor" title="stats.depth"><a href="/configuration/stats/#statsdepth">stats.depth</a></li><li class="sidebar-item__anchor" title="stats.entrypoints"><a href="/configuration/stats/#statsentrypoints">stats.entrypoints</a></li><li class="sidebar-item__anchor" title="stats.env"><a href="/configuration/stats/#statsenv">stats.env</a></li><li class="sidebar-item__anchor" title="stats.errors"><a href="/configuration/stats/#statserrors">stats.errors</a></li><li class="sidebar-item__anchor" title="stats.errorDetails"><a href="/configuration/stats/#statserrordetails">stats.errorDetails</a></li><li class="sidebar-item__anchor" title="stats.excludeAssets"><a href="/configuration/stats/#statsexcludeassets">stats.excludeAssets</a></li><li class="sidebar-item__anchor" title="stats.excludeModules"><a href="/configuration/stats/#statsexcludemodules">stats.excludeModules</a></li><li class="sidebar-item__anchor" title="stats.exclude"><a href="/configuration/stats/#statsexclude">stats.exclude</a></li><li class="sidebar-item__anchor" title="stats.hash"><a href="/configuration/stats/#statshash">stats.hash</a></li><li class="sidebar-item__anchor" title="stats.logging"><a href="/configuration/stats/#statslogging">stats.logging</a></li><li class="sidebar-item__anchor" title="stats.loggingDebug"><a href="/configuration/stats/#statsloggingdebug">stats.loggingDebug</a></li><li class="sidebar-item__anchor" title="stats.loggingTrace"><a href="/configuration/stats/#statsloggingtrace">stats.loggingTrace</a></li><li class="sidebar-item__anchor" title="stats.maxModules"><a href="/configuration/stats/#statsmaxmodules">stats.maxModules</a></li><li class="sidebar-item__anchor" title="stats.modules"><a href="/configuration/stats/#statsmodules">stats.modules</a></li><li class="sidebar-item__anchor" title="stats.modulesSort"><a href="/configuration/stats/#statsmodulessort">stats.modulesSort</a></li><li class="sidebar-item__anchor" title="stats.moduleTrace"><a href="/configuration/stats/#statsmoduletrace">stats.moduleTrace</a></li><li class="sidebar-item__anchor" title="stats.outputPath"><a href="/configuration/stats/#statsoutputpath">stats.outputPath</a></li><li class="sidebar-item__anchor" title="stats.performance"><a href="/configuration/stats/#statsperformance">stats.performance</a></li><li class="sidebar-item__anchor" title="stats.providedExports"><a href="/configuration/stats/#statsprovidedexports">stats.providedExports</a></li><li class="sidebar-item__anchor" title="stats.publicPath"><a href="/configuration/stats/#statspublicpath">stats.publicPath</a></li><li class="sidebar-item__anchor" title="stats.reasons"><a href="/configuration/stats/#statsreasons">stats.reasons</a></li><li class="sidebar-item__anchor" title="stats.source"><a href="/configuration/stats/#statssource">stats.source</a></li><li class="sidebar-item__anchor" title="stats.timings"><a href="/configuration/stats/#statstimings">stats.timings</a></li><li class="sidebar-item__anchor" title="stats.usedExports"><a href="/configuration/stats/#statsusedexports">stats.usedExports</a></li><li class="sidebar-item__anchor" title="stats.version"><a href="/configuration/stats/#statsversion">stats.version</a></li><li class="sidebar-item__anchor" title="stats.warnings"><a href="/configuration/stats/#statswarnings">stats.warnings</a></li><li class="sidebar-item__anchor" title="stats.warningsFilter"><a href="/configuration/stats/#statswarningsfilter">stats.warningsFilter</a></li><li class="sidebar-item__anchor" title="Sorting fields"><a href="/configuration/stats/#sorting-fields">Sorting fields</a></li><li class="sidebar-item__anchor" title="Extending stats behaviours"><a href="/configuration/stats/#extending-stats-behaviours">Extending stats behaviours</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/other-options/">Other Options</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="amd"><a href="/configuration/other-options/#amd">amd</a></li><li class="sidebar-item__anchor" title="bail"><a href="/configuration/other-options/#bail">bail</a></li><li class="sidebar-item__anchor" title="cache"><a href="/configuration/other-options/#cache">cache</a></li><li class="sidebar-item__anchor" title="loader"><a href="/configuration/other-options/#loader">loader</a></li><li class="sidebar-item__anchor" title="parallelism"><a href="/configuration/other-options/#parallelism">parallelism</a></li><li class="sidebar-item__anchor" title="profile"><a href="/configuration/other-options/#profile">profile</a></li><li class="sidebar-item__anchor" title="recordsPath"><a href="/configuration/other-options/#recordspath">recordsPath</a></li><li class="sidebar-item__anchor" title="recordsInputPath"><a href="/configuration/other-options/#recordsinputpath">recordsInputPath</a></li><li class="sidebar-item__anchor" title="recordsOutputPath"><a href="/configuration/other-options/#recordsoutputpath">recordsOutputPath</a></li><li class="sidebar-item__anchor" title="name"><a href="/configuration/other-options/#name">name</a></li><li class="sidebar-item__anchor" title="infrastructureLogging"><a href="/configuration/other-options/#infrastructurelogging">infrastructureLogging</a></li><li class="sidebar-item__anchor" title="infrastructureLogging.level"><a href="/configuration/other-options/#infrastructurelogginglevel">infrastructureLogging.level</a></li><li class="sidebar-item__anchor" title="infrastructureLogging.debug"><a href="/configuration/other-options/#infrastructureloggingdebug">infrastructureLogging.debug</a></li></ul></div></div><div><div class="sidebar-item "><i class="sidebar-item__toggle icon-chevron-right"></i><a class="sidebar-item__title" href="/configuration/printable/">Printable</a><ul class="sidebar-item__anchors"><li class="sidebar-item__anchor" title="Configuration"><a href="/configuration/printable/#configuration">Configuration</a></li><li class="sidebar-item__anchor" title="Use different config file"><a href="/configuration/printable/#use-different-config-file">Use different config file</a></li><li class="sidebar-item__anchor" title="Options"><a href="/configuration/printable/#options">Options</a></li><li class="sidebar-item__anchor" title="Configuration Languages"><a href="/configuration/printable/#configuration-languages">Configuration Languages</a></li><li class="sidebar-item__anchor" title="TypeScript"><a href="/configuration/printable/#typescript">TypeScript</a></li><li class="sidebar-item__anchor" title="CoffeeScript"><a href="/configuration/printable/#coffeescript">CoffeeScript</a></li><li class="sidebar-item__anchor" title="Babel and JSX"><a href="/configuration/printable/#babel-and-jsx">Babel and JSX</a></li><li class="sidebar-item__anchor" title="Configuration Types"><a href="/configuration/printable/#configuration-types">Configuration Types</a></li><li class="sidebar-item__anchor" title="Exporting a Function"><a href="/configuration/printable/#exporting-a-function">Exporting a Function</a></li><li class="sidebar-item__anchor" title="Exporting a Promise"><a href="/configuration/printable/#exporting-a-promise">Exporting a Promise</a></li><li class="sidebar-item__anchor" title="Exporting multiple configurations"><a href="/configuration/printable/#exporting-multiple-configurations">Exporting multiple configurations</a></li><li class="sidebar-item__anchor" title="Entry and Context"><a href="/configuration/printable/#entry-and-context">Entry and Context</a></li><li class="sidebar-item__anchor" title="context"><a href="/configuration/printable/#context">context</a></li><li class="sidebar-item__anchor" title="entry"><a href="/configuration/printable/#entry">entry</a></li><li class="sidebar-item__anchor" title="Naming"><a href="/configuration/printable/#naming">Naming</a></li><li class="sidebar-item__anchor" title="Dynamic entry"><a href="/configuration/printable/#dynamic-entry">Dynamic entry</a></li><li class="sidebar-item__anchor" title="Mode"><a href="/configuration/printable/#mode">Mode</a></li><li class="sidebar-item__anchor" title="Usage"><a href="/configuration/printable/#usage">Usage</a></li><li class="sidebar-item__anchor" title="Mode: development"><a href="/configuration/printable/#mode-development">Mode: development</a></li><li class="sidebar-item__anchor" title="Mode: production"><a href="/configuration/printable/#mode-production">Mode: production</a></li><li class="sidebar-item__anchor" title="Mode: none"><a href="/configuration/printable/#mode-none">Mode: none</a></li><li class="sidebar-item__anchor" title="Output"><a href="/configuration/printable/#output">Output</a></li><li class="sidebar-item__anchor" title="output.auxiliaryComment"><a href="/configuration/printable/#outputauxiliarycomment">output.auxiliaryComment</a></li><li class="sidebar-item__anchor" title="output.chunkFilename"><a href="/configuration/printable/#outputchunkfilename">output.chunkFilename</a></li><li class="sidebar-item__anchor" title="output.chunkLoadTimeout"><a href="/configuration/printable/#outputchunkloadtimeout">output.chunkLoadTimeout</a></li><li class="sidebar-item__anchor" title="output.crossOriginLoading"><a href="/configuration/printable/#outputcrossoriginloading">output.crossOriginLoading</a></li><li class="sidebar-item__anchor" title="output.jsonpScriptType"><a href="/configuration/printable/#outputjsonpscripttype">output.jsonpScriptType</a></li><li class="sidebar-item__anchor" title="output.devtoolFallbackModuleFilenameTemplate"><a href="/configuration/printable/#outputdevtoolfallbackmodulefilenametemplate">output.devtoolFallbackModuleFilenameTemplate</a></li><li class="sidebar-item__anchor" title="output.devtoolLineToLine"><a href="/configuration/printable/#outputdevtoollinetoline">output.devtoolLineToLine</a></li><li class="sidebar-item__anchor" title="output.devtoolModuleFilenameTemplate"><a href="/configuration/printable/#outputdevtoolmodulefilenametemplate">output.devtoolModuleFilenameTemplate</a></li><li class="sidebar-item__anchor" title="output.devtoolNamespace"><a href="/configuration/printable/#outputdevtoolnamespace">output.devtoolNamespace</a></li><li class="sidebar-item__anchor" title="output.filename"><a href="/configuration/printable/#outputfilename">output.filename</a></li><li class="sidebar-item__anchor" title="output.globalObject"><a href="/configuration/printable/#outputglobalobject">output.globalObject</a></li><li class="sidebar-item__anchor" title="output.hashDigest"><a href="/configuration/printable/#outputhashdigest">output.hashDigest</a></li><li class="sidebar-item__anchor" title="output.hashDigestLength"><a href="/configuration/printable/#outputhashdigestlength">output.hashDigestLength</a></li><li class="sidebar-item__anchor" title="output.hashFunction"><a href="/configuration/printable/#outputhashfunction">output.hashFunction</a></li><li class="sidebar-item__anchor" title="output.hashSalt"><a href="/configuration/printable/#outputhashsalt">output.hashSalt</a></li><li class="sidebar-item__anchor" title="output.hotUpdateChunkFilename"><a href="/configuration/printable/#outputhotupdatechunkfilename">output.hotUpdateChunkFilename</a></li><li class="sidebar-item__anchor" title="output.hotUpdateFunction"><a href="/configuration/printable/#outputhotupdatefunction">output.hotUpdateFunction</a></li><li class="sidebar-item__anchor" title="output.hotUpdateMainFilename"><a href="/configuration/printable/#outputhotupdatemainfilename">output.hotUpdateMainFilename</a></li><li class="sidebar-item__anchor" title="output.jsonpFunction"><a href="/configuration/printable/#outputjsonpfunction">output.jsonpFunction</a></li><li class="sidebar-item__anchor" title="output.library"><a href="/configuration/printable/#outputlibrary">output.library</a></li><li class="sidebar-item__anchor" title="output.libraryExport"><a href="/configuration/printable/#outputlibraryexport">output.libraryExport</a></li><li class="sidebar-item__anchor" title="output.libraryTarget"><a href="/configuration/printable/#outputlibrarytarget">output.libraryTarget</a></li><li class="sidebar-item__anchor" title="Expose a Variable"><a href="/configuration/printable/#expose-a-variable">Expose a Variable</a></li><li class="sidebar-item__anchor" title="Expose Via Object Assignment"><a href="/configuration/printable/#expose-via-object-assignment">Expose Via Object Assignment</a></li><li class="sidebar-item__anchor" title="Module Definition Systems"><a href="/configuration/printable/#module-definition-systems">Module Definition Systems</a></li><li class="sidebar-item__anchor" title="Other Targets"><a href="/configuration/printable/#other-targets">Other Targets</a></li><li class="sidebar-item__anchor" title="output.path"><a href="/configuration/printable/#outputpath">output.path</a></li><li class="sidebar-item__anchor" title="output.pathinfo"><a href="/configuration/printable/#outputpathinfo">output.pathinfo</a></li><li class="sidebar-item__anchor" title="output.publicPath"><a href="/configuration/printable/#outputpublicpath">output.publicPath</a></li><li class="sidebar-item__anchor" title="output.sourceMapFilename"><a href="/configuration/printable/#outputsourcemapfilename">output.sourceMapFilename</a></li><li class="sidebar-item__anchor" title="output.sourcePrefix"><a href="/configuration/printable/#outputsourceprefix">output.sourcePrefix</a></li><li class="sidebar-item__anchor" title="output.strictModuleExceptionHandling"><a href="/configuration/printable/#outputstrictmoduleexceptionhandling">output.strictModuleExceptionHandling</a></li><li class="sidebar-item__anchor" title="output.umdNamedDefine"><a href="/configuration/printable/#outputumdnameddefine">output.umdNamedDefine</a></li><li class="sidebar-item__anchor" title="output.futureEmitAssets"><a href="/configuration/printable/#outputfutureemitassets">output.futureEmitAssets</a></li><li class="sidebar-item__anchor" title="Module"><a href="/configuration/printable/#module">Module</a></li><li class="sidebar-item__anchor" title="module.noParse"><a href="/configuration/printable/#modulenoparse">module.noParse</a></li><li class="sidebar-item__anchor" title="module.rules"><a href="/configuration/printable/#modulerules">module.rules</a></li><li class="sidebar-item__anchor" title="module.unsafeCache"><a href="/configuration/printable/#moduleunsafecache">module.unsafeCache</a></li><li class="sidebar-item__anchor" title="Rule"><a href="/configuration/printable/#rule">Rule</a></li><li class="sidebar-item__anchor" title="Rule Conditions"><a href="/configuration/printable/#rule-conditions">Rule Conditions</a></li><li class="sidebar-item__anchor" title="Rule results"><a href="/configuration/printable/#rule-results">Rule results</a></li><li class="sidebar-item__anchor" title="Nested rules"><a href="/configuration/printable/#nested-rules">Nested rules</a></li><li class="sidebar-item__anchor" title="Rule.enforce"><a href="/configuration/printable/#ruleenforce">Rule.enforce</a></li><li class="sidebar-item__anchor" title="Rule.exclude"><a href="/configuration/printable/#ruleexclude">Rule.exclude</a></li><li class="sidebar-item__anchor" title="Rule.include"><a href="/configuration/printable/#ruleinclude">Rule.include</a></li><li class="sidebar-item__anchor" title="Rule.issuer"><a href="/configuration/printable/#ruleissuer">Rule.issuer</a></li><li class="sidebar-item__anchor" title="Rule.loader"><a href="/configuration/printable/#ruleloader">Rule.loader</a></li><li class="sidebar-item__anchor" title="Rule.loaders"><a href="/configuration/printable/#ruleloaders">Rule.loaders</a></li><li class="sidebar-item__anchor" title="Rule.oneOf"><a href="/configuration/printable/#ruleoneof">Rule.oneOf</a></li><li class="sidebar-item__anchor" title="Rule.options"><a href="/configuration/printable/#ruleoptions--rulequery">Rule.options</a></li><li class="sidebar-item__anchor" title="Rule.parser"><a href="/configuration/printable/#ruleparser">Rule.parser</a></li><li class="sidebar-item__anchor" title="Rule.resource"><a href="/configuration/printable/#ruleresource">Rule.resource</a></li><li class="sidebar-item__anchor" title="Rule.resourceQuery"><a href="/configuration/printable/#ruleresourcequery">Rule.resourceQuery</a></li><li class="sidebar-item__anchor" title="Rule.rules"><a href="/configuration/printable/#rulerules">Rule.rules</a></li><li class="sidebar-item__anchor" title="Rule.sideEffects"><a href="/configuration/printable/#rulesideeffects">Rule.sideEffects</a></li><li class="sidebar-item__anchor" title="Rule.test"><a href="/configuration/printable/#ruletest">Rule.test</a></li><li class="sidebar-item__anchor" title="Rule.type"><a href="/configuration/printable/#ruletype">Rule.type</a></li><li class="sidebar-item__anchor" title="Rule.use"><a href="/configuration/printable/#ruleuse">Rule.use</a></li><li class="sidebar-item__anchor" title="Rule.resolve"><a href="/configuration/printable/#ruleresolve">Rule.resolve</a></li><li class="sidebar-item__anchor" title="Condition"><a href="/configuration/printable/#condition">Condition</a></li><li class="sidebar-item__anchor" title="UseEntry"><a href="/configuration/printable/#useentry">UseEntry</a></li><li class="sidebar-item__anchor" title="Module Contexts"><a href="/configuration/printable/#module-contexts">Module Contexts</a></li><li class="sidebar-item__anchor" title="Resolve"><a href="/configuration/printable/#resolve">Resolve</a></li><li class="sidebar-item__anchor" title="resolve"><a href="/configuration/printable/#resolve-1">resolve</a></li><li class="sidebar-item__anchor" title="resolve.alias"><a href="/configuration/printable/#resolvealias">resolve.alias</a></li><li class="sidebar-item__anchor" title="resolve.aliasFields"><a href="/configuration/printable/#resolvealiasfields">resolve.aliasFields</a></li><li class="sidebar-item__anchor" title="resolve.cacheWithContext"><a href="/configuration/printable/#resolvecachewithcontext">resolve.cacheWithContext</a></li><li class="sidebar-item__anchor" title="resolve.descriptionFiles"><a href="/configuration/printable/#resolvedescriptionfiles">resolve.descriptionFiles</a></li><li class="sidebar-item__anchor" title="resolve.enforceExtension"><a href="/configuration/printable/#resolveenforceextension">resolve.enforceExtension</a></li><li class="sidebar-item__anchor" title="resolve.enforceModuleExtension"><a href="/configuration/printable/#resolveenforcemoduleextension">resolve.enforceModuleExtension</a></li><li class="sidebar-item__anchor" title="resolve.extensions"><a href="/configuration/printable/#resolveextensions">resolve.extensions</a></li><li class="sidebar-item__anchor" title="resolve.mainFields"><a href="/configuration/printable/#resolvemainfields">resolve.mainFields</a></li><li class="sidebar-item__anchor" title="resolve.mainFiles"><a href="/configuration/printable/#resolvemainfiles">resolve.mainFiles</a></li><li class="sidebar-item__anchor" title="resolve.modules"><a href="/configuration/printable/#resolvemodules">resolve.modules</a></li><li class="sidebar-item__anchor" title="resolve.unsafeCache"><a href="/configuration/printable/#resolveunsafecache">resolve.unsafeCache</a></li><li class="sidebar-item__anchor" title="resolve.plugins"><a href="/configuration/printable/#resolveplugins">resolve.plugins</a></li><li class="sidebar-item__anchor" title="resolve.symlinks"><a href="/configuration/printable/#resolvesymlinks">resolve.symlinks</a></li><li class="sidebar-item__anchor" title="resolve.cachePredicate"><a href="/configuration/printable/#resolvecachepredicate">resolve.cachePredicate</a></li><li class="sidebar-item__anchor" title="resolveLoader"><a href="/configuration/printable/#resolveloader">resolveLoader</a></li><li class="sidebar-item__anchor" title="resolve.roots"><a href="/configuration/printable/#resolveroots">resolve.roots</a></li><li class="sidebar-item__anchor" title="resolveLoader.moduleExtensions"><a href="/configuration/printable/#resolveloadermoduleextensions">resolveLoader.moduleExtensions</a></li><li class="sidebar-item__anchor" title="Optimization"><a href="/configuration/printable/#optimization">Optimization</a></li><li class="sidebar-item__anchor" title="optimization.minimize"><a href="/configuration/printable/#optimizationminimize">optimization.minimize</a></li><li class="sidebar-item__anchor" title="optimization.minimizer"><a href="/configuration/printable/#optimizationminimizer">optimization.minimizer</a></li><li class="sidebar-item__anchor" title="optimization.splitChunks"><a href="/configuration/printable/#optimizationsplitchunks">optimization.splitChunks</a></li><li class="sidebar-item__anchor" title="optimization.runtimeChunk"><a href="/configuration/printable/#optimizationruntimechunk">optimization.runtimeChunk</a></li><li class="sidebar-item__anchor" title="optimization.noEmitOnErrors"><a href="/configuration/printable/#optimizationnoemitonerrors">optimization.noEmitOnErrors</a></li><li class="sidebar-item__anchor" title="optimization.namedModules"><a href="/configuration/printable/#optimizationnamedmodules">optimization.namedModules</a></li><li class="sidebar-item__anchor" title="optimization.namedChunks"><a href="/configuration/printable/#optimizationnamedchunks">optimization.namedChunks</a></li><li class="sidebar-item__anchor" title="optimization.moduleIds"><a href="/configuration/printable/#optimizationmoduleids">optimization.moduleIds</a></li><li class="sidebar-item__anchor" title="optimization.chunkIds"><a href="/configuration/printable/#optimizationchunkids">optimization.chunkIds</a></li><li class="sidebar-item__anchor" title="optimization.nodeEnv"><a href="/configuration/printable/#optimizationnodeenv">optimization.nodeEnv</a></li><li class="sidebar-item__anchor" title="optimization.mangleWasmImports"><a href="/configuration/printable/#optimizationmanglewasmimports">optimization.mangleWasmImports</a></li><li class="sidebar-item__anchor" title="optimization.removeAvailableModules"><a href="/configuration/printable/#optimizationremoveavailablemodules">optimization.removeAvailableModules</a></li><li class="sidebar-item__anchor" title="optimization.removeEmptyChunks"><a href="/configuration/printable/#optimizationremoveemptychunks">optimization.removeEmptyChunks</a></li><li class="sidebar-item__anchor" title="optimization.mergeDuplicateChunks"><a href="/configuration/printable/#optimizationmergeduplicatechunks">optimization.mergeDuplicateChunks</a></li><li class="sidebar-item__anchor" title="optimization.flagIncludedChunks"><a href="/configuration/printable/#optimizationflagincludedchunks">optimization.flagIncludedChunks</a></li><li class="sidebar-item__anchor" title="optimization.occurrenceOrder"><a href="/configuration/printable/#optimizationoccurrenceorder">optimization.occurrenceOrder</a></li><li class="sidebar-item__anchor" title="optimization.providedExports"><a href="/configuration/printable/#optimizationprovidedexports">optimization.providedExports</a></li><li class="sidebar-item__anchor" title="optimization.usedExports"><a href="/configuration/printable/#optimizationusedexports">optimization.usedExports</a></li><li class="sidebar-item__anchor" title="optimization.concatenateModules"><a href="/configuration/printable/#optimizationconcatenatemodules">optimization.concatenateModules</a></li><li class="sidebar-item__anchor" title="optimization.sideEffects"><a href="/configuration/printable/#optimizationsideeffects">optimization.sideEffects</a></li><li class="sidebar-item__anchor" title="optimization.portableRecords"><a href="/configuration/printable/#optimizationportablerecords">optimization.portableRecords</a></li><li class="sidebar-item__anchor" title="Plugins"><a href="/configuration/printable/#plugins">Plugins</a></li><li class="sidebar-item__anchor" title="plugins"><a href="/configuration/printable/#plugins-1">plugins</a></li><li class="sidebar-item__anchor" title="DevServer"><a href="/configuration/printable/#devserver">DevServer</a></li><li class="sidebar-item__anchor" title="devServer"><a href="/configuration/printable/#devserver-1">devServer</a></li><li class="sidebar-item__anchor" title="devServer.after"><a href="/configuration/printable/#devserverafter">devServer.after</a></li><li class="sidebar-item__anchor" title="devServer.allowedHosts"><a href="/configuration/printable/#devserverallowedhosts">devServer.allowedHosts</a></li><li class="sidebar-item__anchor" title="devServer.before"><a href="/configuration/printable/#devserverbefore">devServer.before</a></li><li class="sidebar-item__anchor" title="devServer.bonjour"><a href="/configuration/printable/#devserverbonjour">devServer.bonjour</a></li><li class="sidebar-item__anchor" title="devServer.clientLogLevel"><a href="/configuration/printable/#devserverclientloglevel">devServer.clientLogLevel</a></li><li class="sidebar-item__anchor" title="devServer.color"><a href="/configuration/printable/#devservercolor---cli-only">devServer.color</a></li><li class="sidebar-item__anchor" title="devServer.compress"><a href="/configuration/printable/#devservercompress">devServer.compress</a></li><li class="sidebar-item__anchor" title="devServer.contentBase"><a href="/configuration/printable/#devservercontentbase">devServer.contentBase</a></li><li class="sidebar-item__anchor" title="devServer.disableHostCheck"><a href="/configuration/printable/#devserverdisablehostcheck">devServer.disableHostCheck</a></li><li class="sidebar-item__anchor" title="devServer.filename"><a href="/configuration/printable/#devserverfilename-">devServer.filename</a></li><li class="sidebar-item__anchor" title="devServer.headers"><a href="/configuration/printable/#devserverheaders-">devServer.headers</a></li><li class="sidebar-item__anchor" title="devServer.historyApiFallback"><a href="/configuration/printable/#devserverhistoryapifallback">devServer.historyApiFallback</a></li><li class="sidebar-item__anchor" title="devServer.host"><a href="/configuration/printable/#devserverhost">devServer.host</a></li><li class="sidebar-item__anchor" title="devServer.hot"><a href="/configuration/printable/#devserverhot">devServer.hot</a></li><li class="sidebar-item__anchor" title="devServer.hotOnly"><a href="/configuration/printable/#devserverhotonly">devServer.hotOnly</a></li><li class="sidebar-item__anchor" title="devServer.http2"><a href="/configuration/printable/#devserverhttp2">devServer.http2</a></li><li class="sidebar-item__anchor" title="devServer.https"><a href="/configuration/printable/#devserverhttps">devServer.https</a></li><li class="sidebar-item__anchor" title="devServer.index"><a href="/configuration/printable/#devserverindex">devServer.index</a></li><li class="sidebar-item__anchor" title="devServer.info"><a href="/configuration/printable/#devserverinfo---cli-only">devServer.info</a></li><li class="sidebar-item__anchor" title="devServer.injectClient"><a href="/configuration/printable/#devserverinjectclient">devServer.injectClient</a></li><li class="sidebar-item__anchor" title="devServer.injectHot"><a href="/configuration/printable/#devserverinjecthot">devServer.injectHot</a></li><li class="sidebar-item__anchor" title="devServer.inline"><a href="/configuration/printable/#devserverinline">devServer.inline</a></li><li class="sidebar-item__anchor" title="devServer.lazy"><a href="/configuration/printable/#devserverlazy-">devServer.lazy</a></li><li class="sidebar-item__anchor" title="devServer.liveReload"><a href="/configuration/printable/#devserverlivereload">devServer.liveReload</a></li><li class="sidebar-item__anchor" title="devServer.mimeTypes"><a href="/configuration/printable/#devservermimetypes-">devServer.mimeTypes</a></li><li class="sidebar-item__anchor" title="devServer.noInfo"><a href="/configuration/printable/#devservernoinfo-">devServer.noInfo</a></li><li class="sidebar-item__anchor" title="devServer.onListening"><a href="/configuration/printable/#devserveronlistening">devServer.onListening</a></li><li class="sidebar-item__anchor" title="devServer.open"><a href="/configuration/printable/#devserveropen">devServer.open</a></li><li class="sidebar-item__anchor" title="devServer.openPage"><a href="/configuration/printable/#devserveropenpage">devServer.openPage</a></li><li class="sidebar-item__anchor" title="devServer.overlay"><a href="/configuration/printable/#devserveroverlay">devServer.overlay</a></li><li class="sidebar-item__anchor" title="devServer.pfx"><a href="/configuration/printable/#devserverpfx">devServer.pfx</a></li><li class="sidebar-item__anchor" title="devServer.pfxPassphrase"><a href="/configuration/printable/#devserverpfxpassphrase">devServer.pfxPassphrase</a></li><li class="sidebar-item__anchor" title="devServer.port"><a href="/configuration/printable/#devserverport">devServer.port</a></li><li class="sidebar-item__anchor" title="devServer.proxy"><a href="/configuration/printable/#devserverproxy">devServer.proxy</a></li><li class="sidebar-item__anchor" title="devServer.progress"><a href="/configuration/printable/#devserverprogress---cli-only">devServer.progress</a></li><li class="sidebar-item__anchor" title="devServer.public"><a href="/configuration/printable/#devserverpublic">devServer.public</a></li><li class="sidebar-item__anchor" title="devServer.publicPath"><a href="/configuration/printable/#devserverpublicpath-">devServer.publicPath</a></li><li class="sidebar-item__anchor" title="devServer.quiet"><a href="/configuration/printable/#devserverquiet-">devServer.quiet</a></li><li class="sidebar-item__anchor" title="devServer.serveIndex"><a href="/configuration/printable/#devserverserveindex">devServer.serveIndex</a></li><li class="sidebar-item__anchor" title="devServer.setup"><a href="/configuration/printable/#devserversetup">devServer.setup</a></li><li class="sidebar-item__anchor" title="devServer.socket"><a href="/configuration/printable/#devserversocket">devServer.socket</a></li><li class="sidebar-item__anchor" title="devServer.sockHost"><a href="/configuration/printable/#devserversockhost">devServer.sockHost</a></li><li class="sidebar-item__anchor" title="devServer.sockPath"><a href="/configuration/printable/#devserversockpath">devServer.sockPath</a></li><li class="sidebar-item__anchor" title="devServer.sockPort"><a href="/configuration/printable/#devserversockport">devServer.sockPort</a></li><li class="sidebar-item__anchor" title="devServer.staticOptions"><a href="/configuration/printable/#devserverstaticoptions">devServer.staticOptions</a></li><li class="sidebar-item__anchor" title="devServer.stats"><a href="/configuration/printable/#devserverstats-">devServer.stats</a></li><li class="sidebar-item__anchor" title="devServer.stdin"><a href="/configuration/printable/#devserverstdin---cli-only">devServer.stdin</a></li><li class="sidebar-item__anchor" title="devServer.transportMode"><a href="/configuration/printable/#devservertransportmode">devServer.transportMode</a></li><li class="sidebar-item__anchor" title="devServer.transportMode.client"><a href="/configuration/printable/#devservertransportmodeclient">devServer.transportMode.client</a></li><li class="sidebar-item__anchor" title="devServer.transportMode.server"><a href="/configuration/printable/#devservertransportmodeserver">devServer.transportMode.server</a></li><li class="sidebar-item__anchor" title="devServer.useLocalIp"><a href="/configuration/printable/#devserveruselocalip">devServer.useLocalIp</a></li><li class="sidebar-item__anchor" title="devServer.watchContentBase"><a href="/configuration/printable/#devserverwatchcontentbase">devServer.watchContentBase</a></li><li class="sidebar-item__anchor" title="devServer.watchOptions"><a href="/configuration/printable/#devserverwatchoptions-">devServer.watchOptions</a></li><li class="sidebar-item__anchor" title="devServer.writeToDisk"><a href="/configuration/printable/#devserverwritetodisk-">devServer.writeToDisk</a></li><li class="sidebar-item__anchor" title="Devtool"><a href="/configuration/printable/#devtool">Devtool</a></li><li class="sidebar-item__anchor" title="devtool"><a href="/configuration/printable/#devtool-1">devtool</a></li><li class="sidebar-item__anchor" title="Qualities"><a href="/configuration/printable/#qualities">Qualities</a></li><li class="sidebar-item__anchor" title="Development"><a href="/configuration/printable/#development">Development</a></li><li class="sidebar-item__anchor" title="Special cases"><a href="/configuration/printable/#special-cases">Special cases</a></li><li class="sidebar-item__anchor" title="Production"><a href="/configuration/printable/#production">Production</a></li><li class="sidebar-item__anchor" title="Target"><a href="/configuration/printable/#target">Target</a></li><li class="sidebar-item__anchor" title="target"><a href="/configuration/printable/#target-1">target</a></li><li class="sidebar-item__anchor" title="string"><a href="/configuration/printable/#string">string</a></li><li class="sidebar-item__anchor" title="function"><a href="/configuration/printable/#function">function</a></li><li class="sidebar-item__anchor" title="Watch and WatchOptions"><a href="/configuration/printable/#watch-and-watchoptions">Watch and WatchOptions</a></li><li class="sidebar-item__anchor" title="watch"><a href="/configuration/printable/#watch">watch</a></li><li class="sidebar-item__anchor" title="watchOptions"><a href="/configuration/printable/#watchoptions">watchOptions</a></li><li class="sidebar-item__anchor" title="watchOptions.aggregateTimeout"><a href="/configuration/printable/#watchoptionsaggregatetimeout">watchOptions.aggregateTimeout</a></li><li class="sidebar-item__anchor" title="watchOptions.ignored"><a href="/configuration/printable/#watchoptionsignored">watchOptions.ignored</a></li><li class="sidebar-item__anchor" title="watchOptions.poll"><a href="/configuration/printable/#watchoptionspoll">watchOptions.poll</a></li><li class="sidebar-item__anchor" title="info-verbosity"><a href="/configuration/printable/#info-verbosity">info-verbosity</a></li><li class="sidebar-item__anchor" title="Troubleshooting"><a href="/configuration/printable/#troubleshooting">Troubleshooting</a></li><li class="sidebar-item__anchor" title="Changes Seen But Not Processed"><a href="/configuration/printable/#changes-seen-but-not-processed">Changes Seen But Not Processed</a></li><li class="sidebar-item__anchor" title="Not Enough Watchers"><a href="/configuration/printable/#not-enough-watchers">Not Enough Watchers</a></li><li class="sidebar-item__anchor" title="macOS fsevents Bug"><a href="/configuration/printable/#macos-fsevents-bug">macOS fsevents Bug</a></li><li class="sidebar-item__anchor" title="Windows Paths"><a href="/configuration/printable/#windows-paths">Windows Paths</a></li><li class="sidebar-item__anchor" title="Vim"><a href="/configuration/printable/#vim">Vim</a></li><li class="sidebar-item__anchor" title="Saving in WebStorm"><a href="/configuration/printable/#saving-in-webstorm">Saving in WebStorm</a></li><li class="sidebar-item__anchor" title="Externals"><a href="/configuration/printable/#externals">Externals</a></li><li class="sidebar-item__anchor" title="externals"><a href="/configuration/printable/#externals-1">externals</a></li><li class="sidebar-item__anchor" title="string"><a href="/configuration/printable/#string-1">string</a></li><li class="sidebar-item__anchor" title="array"><a href="/configuration/printable/#array">array</a></li><li class="sidebar-item__anchor" title="object"><a href="/configuration/printable/#object">object</a></li><li class="sidebar-item__anchor" title="function"><a href="/configuration/printable/#function-1">function</a></li><li class="sidebar-item__anchor" title="regex"><a href="/configuration/printable/#regex">regex</a></li><li class="sidebar-item__anchor" title="Combining syntaxes"><a href="/configuration/printable/#combining-syntaxes">Combining syntaxes</a></li><li class="sidebar-item__anchor" title="Performance"><a href="/configuration/printable/#performance">Performance</a></li><li class="sidebar-item__anchor" title="performance"><a href="/configuration/printable/#performance-1">performance</a></li><li class="sidebar-item__anchor" title="performance.hints"><a href="/configuration/printable/#performancehints">performance.hints</a></li><li class="sidebar-item__anchor" title="performance.maxEntrypointSize"><a href="/configuration/printable/#performancemaxentrypointsize">performance.maxEntrypointSize</a></li><li class="sidebar-item__anchor" title="performance.maxAssetSize"><a href="/configuration/printable/#performancemaxassetsize">performance.maxAssetSize</a></li><li class="sidebar-item__anchor" title="performance.assetFilter"><a href="/configuration/printable/#performanceassetfilter">performance.assetFilter</a></li><li class="sidebar-item__anchor" title="Node"><a href="/configuration/printable/#node">Node</a></li><li class="sidebar-item__anchor" title="node"><a href="/configuration/printable/#node-1">node</a></li><li class="sidebar-item__anchor" title="node.console"><a href="/configuration/printable/#nodeconsole">node.console</a></li><li class="sidebar-item__anchor" title="node.process"><a href="/configuration/printable/#nodeprocess">node.process</a></li><li class="sidebar-item__anchor" title="node.global"><a href="/configuration/printable/#nodeglobal">node.global</a></li><li class="sidebar-item__anchor" title="node.__filename"><a href="/configuration/printable/#node__filename">node.__filename</a></li><li class="sidebar-item__anchor" title="node.__dirname"><a href="/configuration/printable/#node__dirname">node.__dirname</a></li><li class="sidebar-item__anchor" title="node.Buffer"><a href="/configuration/printable/#nodebuffer">node.Buffer</a></li><li class="sidebar-item__anchor" title="node.setImmediate"><a href="/configuration/printable/#nodesetimmediate">node.setImmediate</a></li><li class="sidebar-item__anchor" title="Other node core libraries"><a href="/configuration/printable/#other-node-core-libraries">Other node core libraries</a></li><li class="sidebar-item__anchor" title="Stats"><a href="/configuration/printable/#stats">Stats</a></li><li class="sidebar-item__anchor" title="stats"><a href="/configuration/printable/#stats-1">stats</a></li><li class="sidebar-item__anchor" title="stats.all"><a href="/configuration/printable/#statsall">stats.all</a></li><li class="sidebar-item__anchor" title="stats.assets"><a href="/configuration/printable/#statsassets">stats.assets</a></li><li class="sidebar-item__anchor" title="stats.assetsSort"><a href="/configuration/printable/#statsassetssort">stats.assetsSort</a></li><li class="sidebar-item__anchor" title="stats.builtAt"><a href="/configuration/printable/#statsbuiltat">stats.builtAt</a></li><li class="sidebar-item__anchor" title="stats.cached"><a href="/configuration/printable/#statscached">stats.cached</a></li><li class="sidebar-item__anchor" title="stats.cachedAssets"><a href="/configuration/printable/#statscachedassets">stats.cachedAssets</a></li><li class="sidebar-item__anchor" title="stats.children"><a href="/configuration/printable/#statschildren">stats.children</a></li><li class="sidebar-item__anchor" title="stats.chunks"><a href="/configuration/printable/#statschunks">stats.chunks</a></li><li class="sidebar-item__anchor" title="stats.chunkGroups"><a href="/configuration/printable/#statschunkgroups">stats.chunkGroups</a></li><li class="sidebar-item__anchor" title="stats.chunkModules"><a href="/configuration/printable/#statschunkmodules">stats.chunkModules</a></li><li class="sidebar-item__anchor" title="stats.chunkOrigins"><a href="/configuration/printable/#statschunkorigins">stats.chunkOrigins</a></li><li class="sidebar-item__anchor" title="stats.chunksSort"><a href="/configuration/printable/#statschunkssort">stats.chunksSort</a></li><li class="sidebar-item__anchor" title="stats.context"><a href="/configuration/printable/#statscontext">stats.context</a></li><li class="sidebar-item__anchor" title="stats.colors"><a href="/configuration/printable/#statscolors">stats.colors</a></li><li class="sidebar-item__anchor" title="stats.depth"><a href="/configuration/printable/#statsdepth">stats.depth</a></li><li class="sidebar-item__anchor" title="stats.entrypoints"><a href="/configuration/printable/#statsentrypoints">stats.entrypoints</a></li><li class="sidebar-item__anchor" title="stats.env"><a href="/configuration/printable/#statsenv">stats.env</a></li><li class="sidebar-item__anchor" title="stats.errors"><a href="/configuration/printable/#statserrors">stats.errors</a></li><li class="sidebar-item__anchor" title="stats.errorDetails"><a href="/configuration/printable/#statserrordetails">stats.errorDetails</a></li><li class="sidebar-item__anchor" title="stats.excludeAssets"><a href="/configuration/printable/#statsexcludeassets">stats.excludeAssets</a></li><li class="sidebar-item__anchor" title="stats.excludeModules"><a href="/configuration/printable/#statsexcludemodules">stats.excludeModules</a></li><li class="sidebar-item__anchor" title="stats.exclude"><a href="/configuration/printable/#statsexclude">stats.exclude</a></li><li class="sidebar-item__anchor" title="stats.hash"><a href="/configuration/printable/#statshash">stats.hash</a></li><li class="sidebar-item__anchor" title="stats.logging"><a href="/configuration/printable/#statslogging">stats.logging</a></li><li class="sidebar-item__anchor" title="stats.loggingDebug"><a href="/configuration/printable/#statsloggingdebug">stats.loggingDebug</a></li><li class="sidebar-item__anchor" title="stats.loggingTrace"><a href="/configuration/printable/#statsloggingtrace">stats.loggingTrace</a></li><li class="sidebar-item__anchor" title="stats.maxModules"><a href="/configuration/printable/#statsmaxmodules">stats.maxModules</a></li><li class="sidebar-item__anchor" title="stats.modules"><a href="/configuration/printable/#statsmodules">stats.modules</a></li><li class="sidebar-item__anchor" title="stats.modulesSort"><a href="/configuration/printable/#statsmodulessort">stats.modulesSort</a></li><li class="sidebar-item__anchor" title="stats.moduleTrace"><a href="/configuration/printable/#statsmoduletrace">stats.moduleTrace</a></li><li class="sidebar-item__anchor" title="stats.outputPath"><a href="/configuration/printable/#statsoutputpath">stats.outputPath</a></li><li class="sidebar-item__anchor" title="stats.performance"><a href="/configuration/printable/#statsperformance">stats.performance</a></li><li class="sidebar-item__anchor" title="stats.providedExports"><a href="/configuration/printable/#statsprovidedexports">stats.providedExports</a></li><li class="sidebar-item__anchor" title="stats.publicPath"><a href="/configuration/printable/#statspublicpath">stats.publicPath</a></li><li class="sidebar-item__anchor" title="stats.reasons"><a href="/configuration/printable/#statsreasons">stats.reasons</a></li><li class="sidebar-item__anchor" title="stats.source"><a href="/configuration/printable/#statssource">stats.source</a></li><li class="sidebar-item__anchor" title="stats.timings"><a href="/configuration/printable/#statstimings">stats.timings</a></li><li class="sidebar-item__anchor" title="stats.usedExports"><a href="/configuration/printable/#statsusedexports">stats.usedExports</a></li><li class="sidebar-item__anchor" title="stats.version"><a href="/configuration/printable/#statsversion">stats.version</a></li><li class="sidebar-item__anchor" title="stats.warnings"><a href="/configuration/printable/#statswarnings">stats.warnings</a></li><li class="sidebar-item__anchor" title="stats.warningsFilter"><a href="/configuration/printable/#statswarningsfilter">stats.warningsFilter</a></li><li class="sidebar-item__anchor" title="Sorting fields"><a href="/configuration/printable/#sorting-fields">Sorting fields</a></li><li class="sidebar-item__anchor" title="Extending stats behaviours"><a href="/configuration/printable/#extending-stats-behaviours">Extending stats behaviours</a></li><li class="sidebar-item__anchor" title="Other Options"><a href="/configuration/printable/#other-options">Other Options</a></li><li class="sidebar-item__anchor" title="amd"><a href="/configuration/printable/#amd">amd</a></li><li class="sidebar-item__anchor" title="bail"><a href="/configuration/printable/#bail">bail</a></li><li class="sidebar-item__anchor" title="cache"><a href="/configuration/printable/#cache">cache</a></li><li class="sidebar-item__anchor" title="loader"><a href="/configuration/printable/#loader">loader</a></li><li class="sidebar-item__anchor" title="parallelism"><a href="/configuration/printable/#parallelism">parallelism</a></li><li class="sidebar-item__anchor" title="profile"><a href="/configuration/printable/#profile">profile</a></li><li class="sidebar-item__anchor" title="recordsPath"><a href="/configuration/printable/#recordspath">recordsPath</a></li><li class="sidebar-item__anchor" title="recordsInputPath"><a href="/configuration/printable/#recordsinputpath">recordsInputPath</a></li><li class="sidebar-item__anchor" title="recordsOutputPath"><a href="/configuration/printable/#recordsoutputpath">recordsOutputPath</a></li><li class="sidebar-item__anchor" title="name"><a href="/configuration/printable/#name">name</a></li><li class="sidebar-item__anchor" title="infrastructureLogging"><a href="/configuration/printable/#infrastructurelogging">infrastructureLogging</a></li><li class="sidebar-item__anchor" title="infrastructureLogging.level"><a href="/configuration/printable/#infrastructurelogginglevel">infrastructureLogging.level</a></li><li class="sidebar-item__anchor" title="infrastructureLogging.debug"><a href="/configuration/printable/#infrastructureloggingdebug">infrastructureLogging.debug</a></li></ul></div></div></div></nav><section class="page"><div class="page-links"><a class="page-links__link" href="https://github.com/webpack/webpack.js.org/edit/master/src/content/configuration/dev-server.md">Edit Document<i class="page-links__icon icon-edit"></i></a><span class="page-links__gap">|</span><button class="page-links__link page-links__print as-link" title="Print this page">Print Document<img src="/96ccbfac58b65e83657a220603e00abe.svg"/></button></div><div class="markdown"><h1>DevServer</h1><div><p><a href="https://github.com/webpack/webpack-dev-server">webpack-dev-server</a> can be used to quickly develop an application. See the <a href="/guides/development/">development guide</a> to get started.</p>
<p>This page describes the options that affect the behavior of webpack-dev-server (short: dev-server).</p>
<blockquote class="tip">
<p>Options that are compatible with <a href="https://github.com/webpack/webpack-dev-middleware">webpack-dev-middleware</a> have 🔑 next to them.</p>
</blockquote>
<h2 id="devserver"><code>devServer</code><a href="#devserver" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>object</code></p>
<p>This set of options is picked up by <a href="https://github.com/webpack/webpack-dev-server">webpack-dev-server</a> and can be used to change its behavior in various ways. Here's a simple example that gzips and serves everything from our <code>dist/</code> directory in the project root:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript"><span class="token keyword">var</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
contentBase<span class="token punctuation">:</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'dist'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
compress<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
port<span class="token punctuation">:</span> <span class="token number">9000</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>When the server is started, there will be a message prior to the list of resolved modules:</p>
<pre><code class="hljs language-bash">http://localhost:9000/
webpack output is served from /build/
Content not from webpack is served from /path/to/dist/</code></pre>
<p>that will give some background on where the server is located and what it's serving.</p>
<p>If you're using dev-server through the Node.js API, the options in <code>devServer</code> will be ignored. Pass the options as a second parameter instead: <code>new WebpackDevServer(compiler, {...})</code>. <a href="https://github.com/webpack/webpack-dev-server/tree/master/examples/api/simple">See here</a> for an example of how to use webpack-dev-server through the Node.js API.</p>
<blockquote class="warning">
<p>Be aware that when <a href="/configuration/configuration-types/#exporting-multiple-configurations">exporting multiple configurations</a> only the <code>devServer</code> options for the first configuration will be taken into account and used for all the configurations in the array.</p>
</blockquote>
<blockquote class="tip">
<p>If you're having trouble, navigating to the <code>/webpack-dev-server</code> route will show where files are served. For example, <code>http://localhost:9000/webpack-dev-server</code>.</p>
</blockquote>
<blockquote class="tip">
<p>HTML template is required to serve the bundle, usually it is an <code>index.html</code> file. Make sure that script references are added into HTML, webpack-dev-server doesn't inject them automatically.</p>
</blockquote>
<h2 id="devserverafter"><code>devServer.after</code><a href="#devserverafter" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>function (app, server, compiler)</code></p>
<p>Provides the ability to execute custom middleware after all other middleware
internally within the server.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
after<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>app<span class="token punctuation">,</span> server<span class="token punctuation">,</span> compiler<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// do fancy stuff</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverallowedhosts"><code>devServer.allowedHosts</code><a href="#devserverallowedhosts" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>[string]</code></p>
<p>This option allows you to whitelist services that are allowed to access the dev server.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
allowedHosts<span class="token punctuation">:</span> <span class="token punctuation">[</span>
<span class="token string">'host.com'</span><span class="token punctuation">,</span>
<span class="token string">'subdomain.host.com'</span><span class="token punctuation">,</span>
<span class="token string">'subdomain2.host.com'</span><span class="token punctuation">,</span>
<span class="token string">'host2.com'</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Mimicking django's <code>ALLOWED_HOSTS</code>, a value beginning with <code>.</code> can be used as a subdomain wildcard. <code>.host.com</code> will match <code>host.com</code>, <code>www.host.com</code>, and any other subdomain of <code>host.com</code>.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token comment">// this achieves the same effect as the first example</span>
<span class="token comment">// with the bonus of not having to update your config</span>
<span class="token comment">// if new subdomains need to access the dev server</span>
allowedHosts<span class="token punctuation">:</span> <span class="token punctuation">[</span>
<span class="token string">'.host.com'</span><span class="token punctuation">,</span>
<span class="token string">'host2.com'</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>To use this option with the CLI pass the <code>--allowed-hosts</code> option a comma-delimited string.</p>
<pre><code class="hljs language-bash">webpack-dev-server --entry /entry/file --output-path /output/path --allowed-hosts .host.com,host2.com</code></pre>
<h2 id="devserverbefore"><code>devServer.before</code><a href="#devserverbefore" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>function (app, server, compiler)</code></p>
<p>Provides the ability to execute custom middleware prior to all other middleware
internally within the server. This could be used to define custom handlers, for
example:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
before<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>app<span class="token punctuation">,</span> server<span class="token punctuation">,</span> compiler<span class="token punctuation">)</span> <span class="token punctuation">{</span>
app<span class="token punctuation">.</span><span class="token keyword">get</span><span class="token punctuation">(</span><span class="token string">'/some/path'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>req<span class="token punctuation">,</span> res<span class="token punctuation">)</span> <span class="token punctuation">{</span>
res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">{</span> custom<span class="token punctuation">:</span> <span class="token string">'response'</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverbonjour"><code>devServer.bonjour</code><a href="#devserverbonjour" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code></p>
<p>This option broadcasts the server via <a href="http://www.zeroconf.org/">ZeroConf</a> networking on start</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
bonjour<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --bonjour</code></pre>
<h2 id="devserverclientloglevel"><code>devServer.clientLogLevel</code><a href="#devserverclientloglevel" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string = 'info': 'silent' | 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'none' | 'warning'</code></p>
<blockquote class="warning">
<p><code>none</code> and <code>warning</code> are going to be deprecated at the next major version.</p>
</blockquote>
<p>When using <em>inline mode</em>, the console in your DevTools will show you messages e.g. before reloading, before an error or when <a href="/concepts/hot-module-replacement/">Hot Module Replacement</a> is enabled.</p>
<p><code>devServer.clientLogLevel</code> may be too verbose, you can turn logging off by setting it to <code>'silent'</code>.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
clientLogLevel<span class="token punctuation">:</span> <span class="token string">'silent'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --client-log-level silent</code></pre>
<h2 id="devservercolor---cli-only"><code>devServer.color</code> - CLI only<a href="#devservercolor---cli-only" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Enables/Disables colors on the console.</p>
<pre><code class="hljs language-bash">webpack-dev-server --color</code></pre>
<h2 id="devservercompress"><code>devServer.compress</code><a href="#devservercompress" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Enable <a href="https://betterexplained.com/articles/how-to-optimize-your-site-with-gzip-compression/">gzip compression</a> for everything served:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
compress<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --compress</code></pre>
<h2 id="devservercontentbase"><code>devServer.contentBase</code><a href="#devservercontentbase" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean: false</code> <code>string</code> <code>[string]</code> <code>number</code></p>
<p>Tell the server where to serve content from. This is only necessary if you want to serve static files. <a href="#devserverpublicpath-"><code>devServer.publicPath</code></a> will be used to determine where the bundles should be served from, and takes precedence.</p>
<blockquote class="tip">
<p>It is recommended to use an absolute path.</p>
</blockquote>
<p>By default it will use your current working directory to serve content. To disable <code>contentBase</code> set it to <code>false</code>.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
contentBase<span class="token punctuation">:</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'public'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>It is also possible to serve from multiple directories:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
contentBase<span class="token punctuation">:</span> <span class="token punctuation">[</span>path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'public'</span><span class="token punctuation">)</span><span class="token punctuation">,</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'assets'</span><span class="token punctuation">)</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --content-base /path/to/content/dir</code></pre>
<h2 id="devserverdisablehostcheck"><code>devServer.disableHostCheck</code><a href="#devserverdisablehostcheck" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>When set to <code>true</code> this option bypasses host checking. <strong>THIS IS NOT RECOMMENDED</strong> as apps that do not check the host are vulnerable to DNS rebinding attacks.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
disableHostCheck<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --disable-host-check</code></pre>
<h2 id="devserverfilename-"><code>devServer.filename</code> 🔑<a href="#devserverfilename-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>This option lets you reduce the compilations in <a href="#devserverlazy-">lazy mode</a>.
By default in <a href="#devserverlazy-">lazy mode</a>, every request results in a new compilation. With <code>filename</code>, it's possible to only compile when a certain file is requested.</p>
<p>If <a href="/configuration/output/#outputfilename"><code>output.filename</code></a> is set to <code>'bundle.js'</code> and <code>devServer.filename</code> is used like this:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
output<span class="token punctuation">:</span> <span class="token punctuation">{</span>
filename<span class="token punctuation">:</span> <span class="token string">'bundle.js'</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
lazy<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
filename<span class="token punctuation">:</span> <span class="token string">'bundle.js'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>It will now only compile the bundle when <code>/bundle.js</code> is requested.</p>
<blockquote class="tip">
<p><code>filename</code> has no effect when used without <a href="#devserverlazy-">lazy mode</a>.</p>
</blockquote>
<h2 id="devserverheaders-"><code>devServer.headers</code> 🔑<a href="#devserverheaders-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>object</code></p>
<p>Adds headers to all responses:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
headers<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token string">'X-Custom-Foo'</span><span class="token punctuation">:</span> <span class="token string">'bar'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverhistoryapifallback"><code>devServer.historyApiFallback</code><a href="#devserverhistoryapifallback" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code> <code>object</code></p>
<p>When using the <a href="https://developer.mozilla.org/en-US/docs/Web/API/History">HTML5 History API</a>, the <code>index.html</code> page will likely have to be served in place of any <code>404</code> responses. Enable <code>devServer.historyApiFallback</code> by setting it to <code>true</code>:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
historyApiFallback<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>By passing an object this behavior can be controlled further using options like <code>rewrites</code>:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
historyApiFallback<span class="token punctuation">:</span> <span class="token punctuation">{</span>
rewrites<span class="token punctuation">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span> <span class="token keyword">from</span><span class="token punctuation">:</span> <span class="token regex">/^\/$/</span><span class="token punctuation">,</span> to<span class="token punctuation">:</span> <span class="token string">'/views/landing.html'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span> <span class="token keyword">from</span><span class="token punctuation">:</span> <span class="token regex">/^\/subpage/</span><span class="token punctuation">,</span> to<span class="token punctuation">:</span> <span class="token string">'/views/subpage.html'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span> <span class="token keyword">from</span><span class="token punctuation">:</span> <span class="token regex">/./</span><span class="token punctuation">,</span> to<span class="token punctuation">:</span> <span class="token string">'/views/404.html'</span> <span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>When using dots in your path (common with Angular), you may need to use the <code>disableDotRule</code>:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
historyApiFallback<span class="token punctuation">:</span> <span class="token punctuation">{</span>
disableDotRule<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --history-api-fallback</code></pre>
<p>For more options and information, see the <a href="https://github.com/bripkens/connect-history-api-fallback">connect-history-api-fallback</a> documentation.</p>
<h2 id="devserverhost"><code>devServer.host</code><a href="#devserverhost" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string = 'localhost'</code></p>
<p>Specify a host to use. If you want your server to be accessible externally, specify it like this:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
host<span class="token punctuation">:</span> <span class="token string">'0.0.0.0'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --host 0.0.0.0</code></pre>
<h2 id="devserverhot"><code>devServer.hot</code><a href="#devserverhot" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Enable webpack's <a href="/concepts/hot-module-replacement/">Hot Module Replacement</a> feature:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
hot<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<blockquote class="tip">
<p>Note that <a href="/plugins/hot-module-replacement-plugin/"><code>webpack.HotModuleReplacementPlugin</code></a> is required to fully enable HMR. If <code>webpack</code> or <code>webpack-dev-server</code> are launched with the <code>--hot</code> option, this plugin will be added automatically, so you may not need to add this to your <code>webpack.config.js</code>. See the <a href="/concepts/hot-module-replacement/">HMR concepts page</a> for more information.</p>
</blockquote>
<h2 id="devserverhotonly"><code>devServer.hotOnly</code><a href="#devserverhotonly" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Enables Hot Module Replacement (see <a href="#devserverhot"><code>devServer.hot</code></a>) without page refresh as fallback in case of build failures.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
hotOnly<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --hot-only</code></pre>
<h2 id="devserverhttp2"><code>devServer.http2</code><a href="#devserverhttp2" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code></p>
<p>Serve over HTTP/2 using <a href="https://www.npmjs.com/package/spdy">spdy</a>. This option is ignored for Node 10.0.0 and above, as spdy is broken for those versions. The dev server will migrate over to Node's built-in HTTP/2 once <a href="https://expressjs.com/">Express</a> supports it.</p>
<p>If <code>devServer.http2</code> is not explicitly set to <code>false</code>, it will default to <code>true</code> when <a href="#devserverhttps"><code>devServer.https</code></a> is enabled. When <code>devServer.http2</code> is enabled but the server is unable to serve over HTTP/2, the server defaults to HTTPS.</p>
<p>HTTP/2 with a self-signed certificate:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
http2<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Provide your own certificate using the <a href="#devserverhttps">https</a> option:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
http2<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
https<span class="token punctuation">:</span> <span class="token punctuation">{</span>
key<span class="token punctuation">:</span> fs<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span><span class="token string">'/path/to/server.key'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
cert<span class="token punctuation">:</span> fs<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span><span class="token string">'/path/to/server.crt'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
ca<span class="token punctuation">:</span> fs<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span><span class="token string">'/path/to/ca.pem'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --http2</code></pre>
<p>To pass your own certificate via CLI, use the following options</p>
<pre><code class="hljs language-bash">webpack-dev-server --http2 --key /path/to/server.key --cert /path/to/server.crt --cacert /path/to/ca.pem</code></pre>
<h2 id="devserverhttps"><code>devServer.https</code><a href="#devserverhttps" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code> <code>object</code></p>
<p>By default dev-server will be served over HTTP. It can optionally be served over HTTP/2 with HTTPS:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
https<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>With the above setting a self-signed certificate is used, but you can provide your own:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
https<span class="token punctuation">:</span> <span class="token punctuation">{</span>
key<span class="token punctuation">:</span> fs<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span><span class="token string">'/path/to/server.key'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
cert<span class="token punctuation">:</span> fs<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span><span class="token string">'/path/to/server.crt'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
ca<span class="token punctuation">:</span> fs<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span><span class="token string">'/path/to/ca.pem'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>This object is passed straight to Node.js HTTPS module, so see the <a href="https://nodejs.org/api/https.html">HTTPS documentation</a> for more information.</p>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --https</code></pre>
<p>To pass your own certificate via the CLI use the following options</p>
<pre><code class="hljs language-bash">webpack-dev-server --https --key /path/to/server.key --cert /path/to/server.crt --cacert /path/to/ca.pem</code></pre>
<h2 id="devserverindex"><code>devServer.index</code><a href="#devserverindex" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>The filename that is considered the index file.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
index<span class="token punctuation">:</span> <span class="token string">'index.html'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverinfo---cli-only"><code>devServer.info</code> - CLI only<a href="#devserverinfo---cli-only" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Output cli information. It is enabled by default.</p>
<pre><code class="hljs language-bash">webpack-dev-server --info<span class="token operator">=</span>false</code></pre>
<h2 id="devserverinjectclient"><code>devServer.injectClient</code><a href="#devserverinjectclient" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code> <code>function (compilerConfig) => boolean</code></p>
<p>Tells <code>devServer</code> to inject a client. Setting <code>devServer.injectClient</code> to <code>true</code> will result in always injecting a client. It is possible to provide a function to inject conditionally:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
injectClient<span class="token punctuation">:</span> <span class="token punctuation">(</span>compilerConfig<span class="token punctuation">)</span> <span class="token operator">=></span> compilerConfig<span class="token punctuation">.</span>name <span class="token operator">===</span> <span class="token string">'only-include'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverinjecthot"><code>devServer.injectHot</code><a href="#devserverinjecthot" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code> <code>function (compilerConfig) => boolean</code></p>
<p>Tells <code>devServer</code> to inject a Hot Module Replacement. Setting <code>devServer.injectHot</code> to <code>true</code> will result in always injecting. It is possible to provide a function to inject conditionally:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
hot<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
injectHot<span class="token punctuation">:</span> <span class="token punctuation">(</span>compilerConfig<span class="token punctuation">)</span> <span class="token operator">=></span> compilerConfig<span class="token punctuation">.</span>name <span class="token operator">===</span> <span class="token string">'only-include'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<blockquote class="warning">
<p>Make sure that <a href="#devserverhot"><code>devServer.hot</code></a> is set to <code>true</code> because <code>devServer.injectHot</code> only works with HMR.</p>
</blockquote>
<h2 id="devserverinline"><code>devServer.inline</code><a href="#devserverinline" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Toggle between the dev-server's two different modes. By default the application will be served with <em>inline mode</em> enabled. This means that a script will be inserted in your bundle to take care of live reloading, and build messages will appear in the browser console.</p>
<p>It is also possible to use <strong>iframe mode</strong>, which uses an <code><iframe></code> under a notification bar with messages about the build. To switch to <strong>iframe mode</strong>:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
inline<span class="token punctuation">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --inline<span class="token operator">=</span>false</code></pre>
<blockquote class="tip">
<p>Inline mode is recommended for <a href="/plugins/hot-module-replacement-plugin/">Hot Module Replacement</a> as it includes an HMR trigger from the websocket. Polling mode can be used as an alternative, but requires an additional entry point, <code>'webpack/hot/poll?1000'</code>.</p>
</blockquote>
<h2 id="devserverlazy-"><code>devServer.lazy</code> 🔑<a href="#devserverlazy-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>When <code>devServer.lazy</code> is enabled, the dev-server will only compile the bundle when it gets requested. This means that webpack will not watch any file changes. We call this <strong>lazy mode</strong>.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
lazy<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --lazy</code></pre>
<blockquote class="tip">
<p><a href="#devserverwatchoptions-"><code>watchOptions</code></a> will have no effect when used with <strong>lazy mode</strong>.</p>
</blockquote>
<blockquote class="tip">
<p>If you use the CLI, make sure <strong>inline mode</strong> is disabled.</p>
</blockquote>
<h2 id="devserverlivereload"><code>devServer.liveReload</code><a href="#devserverlivereload" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = true</code></p>
<p>By default, the dev-server will reload/refresh the page when file changes are detected. <a href="#devserverhot"><code>devServer.hot</code></a> option must be disabled or <a href="#devserverwatchcontentbase"><code>devServer.watchContentBase</code></a> option must be enabled in order for <code>liveReload</code> to take effect. Disable <code>devServer.liveReload</code> by setting it to <code>false</code>:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
liveReload<span class="token punctuation">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --no-live-reload</code></pre>
<h2 id="devservermimetypes-"><code>devServer.mimeTypes</code> 🔑<a href="#devservermimetypes-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>object</code></p>
<p>Allows dev-server to register custom mime types.
The object is passed to the underlying <code>webpack-dev-middleware</code>.
See <a href="https://github.com/webpack/webpack-dev-middleware#mimetypes">documentation</a> for usage notes.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
mimeTypes<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token string">'text/html'</span><span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'phtml'</span><span class="token punctuation">]</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devservernoinfo-"><code>devServer.noInfo</code> 🔑<a href="#devservernoinfo-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code></p>
<p>Tells dev-server to supress messages like the webpack bundle information. Errors and warnings will still be shown.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
noInfo<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserveronlistening"><code>devServer.onListening</code><a href="#devserveronlistening" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>function (server)</code></p>
<p>Provides an option to execute a custom function when <code>webpack-dev-server</code> starts listening for connections on a port.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
onListening<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>server<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> port <span class="token operator">=</span> server<span class="token punctuation">.</span>listeningApp<span class="token punctuation">.</span><span class="token function">address</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>port<span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Listening on port:'</span><span class="token punctuation">,</span> port<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserveropen"><code>devServer.open</code><a href="#devserveropen" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean: false</code> <code>string</code></p>
<p>Tells dev-server to open the browser after server had been started. Set it to <code>true</code> to open your default browser.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
open<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Provide browser name to use instead of the default one:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
open<span class="token punctuation">:</span> <span class="token string">'Google Chrome'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --open <span class="token string">'Google Chrome'</span></code></pre>
<blockquote class="tip">
<p>The browser application name is platform dependent. Don't hard code it in reusable modules. For example, <code>'Chrome'</code> is <code>'Google Chrome'</code> on macOS, <code>'google-chrome'</code> on Linux and <code>'chrome'</code> on Windows.</p>
</blockquote>
<h2 id="devserveropenpage"><code>devServer.openPage</code><a href="#devserveropenpage" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code> <code>[string]</code></p>
<p>Specify a page to navigate to when opening the browser.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
openPage<span class="token punctuation">:</span> <span class="token string">'/different/page'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --open-page <span class="token string">"/different/page"</span></code></pre>
<p>If you wish to specify multiple pages to open in the browser.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
openPage<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'/different/page1'</span><span class="token punctuation">,</span> <span class="token string">'/different/page2'</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --open-page <span class="token string">"/different/page1,/different/page2"</span></code></pre>
<h2 id="devserveroverlay"><code>devServer.overlay</code><a href="#devserveroverlay" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code> <code>object: { errors boolean = false, warnings boolean = false }</code></p>
<p>Shows a full-screen overlay in the browser when there are compiler errors or warnings. If you want to show only compiler errors:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
overlay<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>If you want to show warnings as well as errors:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
overlay<span class="token punctuation">:</span> <span class="token punctuation">{</span>
warnings<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
errors<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverpfx"><code>devServer.pfx</code><a href="#devserverpfx" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>When used via the CLI, a path to an SSL .pfx file. If used in options, it should be the bytestream of the .pfx file.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
pfx<span class="token punctuation">:</span> <span class="token string">'/path/to/file.pfx'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --pfx /path/to/file.pfx</code></pre>
<h2 id="devserverpfxpassphrase"><code>devServer.pfxPassphrase</code><a href="#devserverpfxpassphrase" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>The passphrase to a SSL PFX file.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
pfxPassphrase<span class="token punctuation">:</span> <span class="token string">'passphrase'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --pfx-passphrase passphrase</code></pre>
<h2 id="devserverport"><code>devServer.port</code><a href="#devserverport" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>number</code></p>
<p>Specify a port number to listen for requests on:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
port<span class="token punctuation">:</span> <span class="token number">8080</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --port 8080</code></pre>
<h2 id="devserverproxy"><code>devServer.proxy</code><a href="#devserverproxy" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>object</code> <code>[object, function]</code></p>
<p>Proxying some URLs can be useful when you have a separate API backend development server and you want to send API requests on the same domain.</p>
<p>The dev-server makes use of the powerful <a href="https://github.com/chimurai/http-proxy-middleware">http-proxy-middleware</a> package. Check out its <a href="https://github.com/chimurai/http-proxy-middleware#options">documentation</a> for more advanced usages. Note that some of <code>http-proxy-middleware</code>'s features do not require a <code>target</code> key, e.g. its <code>router</code> feature, but you will still need to include a <code>target</code> key in your config here, otherwise <code>webpack-dev-server</code> won't pass it along to <code>http-proxy-middleware</code>).</p>
<p>With a backend on <code>localhost:3000</code>, you can use this to enable proxying:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token string">'/api'</span><span class="token punctuation">:</span> <span class="token string">'http://localhost:3000'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>A request to <code>/api/users</code> will now proxy the request to <code>http://localhost:3000/api/users</code>.</p>
<p>If you don't want <code>/api</code> to be passed along, we need to rewrite the path:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token string">'/api'</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>
target<span class="token punctuation">:</span> <span class="token string">'http://localhost:3000'</span><span class="token punctuation">,</span>
pathRewrite<span class="token punctuation">:</span> <span class="token punctuation">{</span><span class="token string">'^/api'</span> <span class="token punctuation">:</span> <span class="token string">''</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>A backend server running on HTTPS with an invalid certificate will not be accepted by default. If you want to, modify your config like this:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token string">'/api'</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>
target<span class="token punctuation">:</span> <span class="token string">'https://other-server.example.com'</span><span class="token punctuation">,</span>
secure<span class="token punctuation">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Sometimes you don't want to proxy everything. It is possible to bypass the proxy based on the return value of a function.</p>
<p>In the function you get access to the request, response and proxy options.</p>
<ul>
<li>Return <code>null</code> or <code>undefined</code> to continue processing the request with proxy.</li>
<li>Return <code>false</code> to produce a 404 error for the request.</li>
<li>Return a path to serve from, instead of continuing to proxy the request.</li>
</ul>
<p>E.g. for a browser request, you want to serve a HTML page, but for an API request you want to proxy it. You could do something like this:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token string">'/api'</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>
target<span class="token punctuation">:</span> <span class="token string">'http://localhost:3000'</span><span class="token punctuation">,</span>
bypass<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>req<span class="token punctuation">,</span> res<span class="token punctuation">,</span> proxyOptions<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>req<span class="token punctuation">.</span>headers<span class="token punctuation">.</span>accept<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">'html'</span><span class="token punctuation">)</span> <span class="token operator">!==</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Skipping proxy for browser request.'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token string">'/index.html'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>If you want to proxy multiple, specific paths to the same target, you can use an array of one or more objects with a <code>context</code> property:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
context<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'/auth'</span><span class="token punctuation">,</span> <span class="token string">'/api'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
target<span class="token punctuation">:</span> <span class="token string">'http://localhost:3000'</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Note that requests to root won't be proxied by default. To enable root proxying, the <code>devServer.index</code> option should be specified as a falsy value:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
index<span class="token punctuation">:</span> <span class="token string">''</span><span class="token punctuation">,</span> <span class="token comment">// specify to enable root proxying</span>
host<span class="token punctuation">:</span> <span class="token string">'...'</span><span class="token punctuation">,</span>
contentBase<span class="token punctuation">:</span> <span class="token string">'...'</span><span class="token punctuation">,</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">{</span>
context<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
target<span class="token punctuation">:</span> <span class="token string">'http://localhost:1234'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>The origin of the host header is kept when proxying by default, you can set <code>changeOrigin</code> to <code>true</code> to override this behaviour. It is useful in some cases like using <a href="https://en.wikipedia.org/wiki/Virtual_hosting#Name-based">name-based virtual hosted sites</a>.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
proxy<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token string">'/api'</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>
target<span class="token punctuation">:</span> <span class="token string">'http://localhost:3000'</span><span class="token punctuation">,</span>
changeOrigin<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverprogress---cli-only"><code>devServer.progress</code> - CLI only<a href="#devserverprogress---cli-only" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Output running progress to console.</p>
<pre><code class="hljs language-bash">webpack-dev-server --progress</code></pre>
<h2 id="devserverpublic"><code>devServer.public</code><a href="#devserverpublic" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>When using <em>inline mode</em> and you're proxying dev-server, the inline client script does not always know where to connect to. It will try to guess the URL of the server based on <code>window.location</code>, but if that fails you'll need to use this.</p>
<p>For example, the dev-server is proxied by nginx, and available on <code>myapp.test</code>:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span><span class="token punctuation">:</span> <span class="token string">'myapp.test:80'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --public myapp.test:80</code></pre>
<h2 id="devserverpublicpath-"><code>devServer.publicPath</code> 🔑<a href="#devserverpublicpath-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string = '/'</code></p>
<p>The bundled files will be available in the browser under this path.</p>
<p>Imagine that the server is running under <code>http://localhost:8080</code> and <a href="/configuration/output/#outputfilename"><code>output.filename</code></a> is set to <code>bundle.js</code>. By default the <code>devServer.publicPath</code> is <code>'/'</code>, so your bundle is available as <code>http://localhost:8080/bundle.js</code>.</p>
<p>Change <code>devServer.publicPath</code> to put bundle under specific directory:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
publicPath<span class="token punctuation">:</span> <span class="token string">'/assets/'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>The bundle will now be available as <code>http://localhost:8080/assets/bundle.js</code>.</p>
<blockquote class="tip">
<p>Make sure <code>devServer.publicPath</code> always starts and ends with a forward slash.</p>
</blockquote>
<p>It is also possible to use a full URL.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
publicPath<span class="token punctuation">:</span> <span class="token string">'http://localhost:8080/assets/'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>The bundle will also be available as <code>http://localhost:8080/assets/bundle.js</code>.</p>
<blockquote class="tip">
<p>It is recommended that <code>devServer.publicPath</code> is the same as <a href="/configuration/output/#outputpublicpath"><code>output.publicPath</code></a>.</p>
</blockquote>
<h2 id="devserverquiet-"><code>devServer.quiet</code> 🔑<a href="#devserverquiet-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>With <code>devServer.quiet</code> enabled, nothing except the initial startup information will be written to the console. This also means that errors or warnings from webpack are not visible.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
quiet<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --quiet</code></pre>
<h2 id="devserverserveindex"><code>devServer.serveIndex</code><a href="#devserverserveindex" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = true</code></p>
<p>Tells dev-server to use <a href="https://github.com/expressjs/serve-index"><code>serveIndex</code></a> middleware when enabled.</p>
<p><a href="https://github.com/expressjs/serve-index"><code>serveIndex</code></a> middleware generates directory listings on viewing directories that don't have an index.html file.</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
serveIndex<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserversetup"><code>devServer.setup</code><a href="#devserversetup" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>function (app, server)</code></p>
<blockquote class="warning">
<p>This option is <strong>deprecated</strong> in favor of <a href="#devserverbefore"><code>devServer.before</code></a> and will be removed in v3.0.0.</p>
</blockquote>
<p>Here you can access the Express app object and add your own custom middleware to it.
For example, to define custom handlers for some paths:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
setup<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>app<span class="token punctuation">,</span> server<span class="token punctuation">)</span> <span class="token punctuation">{</span>
app<span class="token punctuation">.</span><span class="token keyword">get</span><span class="token punctuation">(</span><span class="token string">'/some/path'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>req<span class="token punctuation">,</span> res<span class="token punctuation">)</span> <span class="token punctuation">{</span>
res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">{</span> custom<span class="token punctuation">:</span> <span class="token string">'response'</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserversocket"><code>devServer.socket</code><a href="#devserversocket" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>The Unix socket to listen to (instead of a host).</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
socket<span class="token punctuation">:</span> <span class="token string">'socket'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --socket socket</code></pre>
<h2 id="devserversockhost"><code>devServer.sockHost</code><a href="#devserversockhost" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string</code></p>
<p>Tells clients connected to <code>devServer</code> to use provided socket host.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
sockHost<span class="token punctuation">:</span> <span class="token string">'myhost.test'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserversockpath"><code>devServer.sockPath</code><a href="#devserversockpath" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string = '/sockjs-node'</code></p>
<p>The path at which to connect to the reloading socket.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
sockPath<span class="token punctuation">:</span> <span class="token string">'/socket'</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --sockPath /socket</code></pre>
<h2 id="devserversockport"><code>devServer.sockPort</code><a href="#devserversockport" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>number</code> <code>string</code></p>
<p>Tells clients connected to <code>devServer</code> to use provided socket port.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
sockPort<span class="token punctuation">:</span> <span class="token number">8080</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserverstaticoptions"><code>devServer.staticOptions</code><a href="#devserverstaticoptions" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p>It is possible to configure advanced options for serving static files from <code>contentBase</code>. See the <a href="http://expressjs.com/en/4x/api.html#express.static">Express documentation</a> for the possible options.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
staticOptions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
redirect<span class="token punctuation">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<blockquote class="tip">
<p>This only works when using <a href="#devservercontentbase"><code>devServer.contentBase</code></a> as a <code>string</code>.</p>
</blockquote>
<h2 id="devserverstats-"><code>devServer.stats</code> 🔑<a href="#devserverstats-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string: 'none' | 'errors-only' | 'minimal' | 'normal' | 'verbose'</code> <code>object</code></p>
<p>This option lets you precisely control what bundle information gets displayed. This can be a nice middle ground if you want some bundle information, but not all of it.</p>
<p>To show only errors in your bundle:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
stats<span class="token punctuation">:</span> <span class="token string">'errors-only'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>For more information, see the <a href="/configuration/stats/"><strong>stats documentation</strong></a>.</p>
<blockquote class="tip">
<p>This option has no effect when used with <code>quiet</code> or <code>noInfo</code>.</p>
</blockquote>
<h2 id="devserverstdin---cli-only"><code>devServer.stdin</code> - CLI only<a href="#devserverstdin---cli-only" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>This option closes the server when stdin ends.</p>
<pre><code class="hljs language-bash">webpack-dev-server --stdin</code></pre>
<h2 id="devservertransportmode"><code>devServer.transportMode</code><a href="#devservertransportmode" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>string = 'sockjs': 'sockjs' | 'ws'</code> <code>object</code></p>
<blockquote class="warning">
<p><code>transportMode</code> is an experimental option, meaning its usage could potentially change without warning.</p>
</blockquote>
<blockquote class="tip">
<p>Providing a string to <code>devServer.transportMode</code> is a shortcut to setting both <code>devServer.transportMode.client</code> and <code>devServer.transportMode.server</code> to the given string value.</p>
</blockquote>
<p>This option allows us either to choose the current <code>devServer</code> transport mode for client/server individually or to provide custom client/server implementation. This allows to specify how browser or other client communicates with the <code>devServer</code>.</p>
<p>The current default mode is <a href="https://www.npmjs.com/package/sockjs"><code>'sockjs'</code></a>. This mode uses <a href="https://github.com/sockjs/sockjs-node">SockJS-node</a> as a server, and <a href="https://www.npmjs.com/package/sockjs-client">SockJS-client</a> on the client.</p>
<p><code>'ws'</code> mode will become the default mode in the next major <code>devServer</code> version. This mode uses <a href="https://www.npmjs.com/package/ws">ws</a> as a server, and native WebSockets on the client.</p>
<p>Use <code>'ws'</code> mode:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
transportMode<span class="token punctuation">:</span> <span class="token string">'ws'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<blockquote class="tip">
<p>When providing a custom client and server implementation make sure that they are compatible with one another to communicate successfully.</p>
</blockquote>
<h3 id="devservertransportmodeclient"><code>devServer.transportMode.client</code><a href="#devservertransportmodeclient" aria-hidden="true"><span class="icon icon-link"></span></a></h3>
<p><code>string</code> <code>path</code></p>
<p>To create a custom client implementation, create a class that extends <a href="https://github.com/webpack/webpack-dev-server/blob/master/client-src/clients/BaseClient.js"><code>BaseClient</code></a>.</p>
<p>Using path to <code>CustomClient.js</code>, a custom WebSocket client implementation, along with the compatible <code>'ws'</code> server:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
transportMode<span class="token punctuation">:</span> <span class="token punctuation">{</span>
client<span class="token punctuation">:</span> require<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'./CustomClient'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
server<span class="token punctuation">:</span> <span class="token string">'ws'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h3 id="devservertransportmodeserver"><code>devServer.transportMode.server</code><a href="#devservertransportmodeserver" aria-hidden="true"><span class="icon icon-link"></span></a></h3>
<p><code>string</code> <code>path</code> <code>function</code></p>
<p>To create a custom server implementation, create a class that extends <a href="https://github.com/webpack/webpack-dev-server/blob/master/lib/servers/BaseServer.js"><code>BaseServer</code></a>.</p>
<p>Using path to <code>CustomServer.js</code>, a custom WebSocket server implementation, along with the compatible <code>'ws'</code> client:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
transportMode<span class="token punctuation">:</span> <span class="token punctuation">{</span>
client<span class="token punctuation">:</span> <span class="token string">'ws'</span><span class="token punctuation">,</span>
server<span class="token punctuation">:</span> require<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'./CustomServer'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Using class exported by <code>CustomServer.js</code>, a custom WebSocket server implementation, along with the compatible <code>'ws'</code> client:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
transportMode<span class="token punctuation">:</span> <span class="token punctuation">{</span>
client<span class="token punctuation">:</span> <span class="token string">'ws'</span><span class="token punctuation">,</span>
server<span class="token punctuation">:</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./CustomServer'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Using custom, compatible WebSocket client and server implementations:</p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
transportMode<span class="token punctuation">:</span> <span class="token punctuation">{</span>
client<span class="token punctuation">:</span> require<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'./CustomClient'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
server<span class="token punctuation">:</span> require<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'./CustomServer'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<h2 id="devserveruselocalip"><code>devServer.useLocalIp</code><a href="#devserveruselocalip" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>This option lets the browser open with your local IP.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
useLocalIp<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --useLocalIp</code></pre>
<h2 id="devserverwatchcontentbase"><code>devServer.watchContentBase</code><a href="#devserverwatchcontentbase" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean</code></p>
<p>Tell dev-server to watch the files served by the <a href="#devservercontentbase"><code>devServer.contentBase</code></a> option. It is disabled by default. When enabled, file changes will trigger a full page reload.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
watchContentBase<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Usage via the CLI</p>
<pre><code class="hljs language-bash">webpack-dev-server --watch-content-base</code></pre>
<h2 id="devserverwatchoptions-"><code>devServer.watchOptions</code> 🔑<a href="#devserverwatchoptions-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>object</code></p>
<p>Control options related to watching the files.</p>
<p>webpack uses the file system to get notified of file changes. In some cases this does not work. For example, when using Network File System (NFS). <a href="https://www.vagrantup.com/">Vagrant</a> also has a lot of problems with this. In these cases, use polling:</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
watchOptions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
poll<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>If this is too heavy on the file system, you can change this to an integer to set the interval in milliseconds.</p>
<p>See <a href="/configuration/watch/">WatchOptions</a> for more options.</p>
<h2 id="devserverwritetodisk-"><code>devServer.writeToDisk</code> 🔑<a href="#devserverwritetodisk-" aria-hidden="true"><span class="icon icon-link"></span></a></h2>
<p><code>boolean = false</code> <code>function (filePath)</code></p>
<p>Tells <code>devServer</code> to write generated assets to the disk. The output is written to the <a href="/configuration/output/#outputpath">output.path</a> directory.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
writeToDisk<span class="token punctuation">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
<p>Providing a <code>Function</code> to <code>devServer.writeToDisk</code> can be used for filtering. The function follows the same premise as <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter"><code>Array#filter</code></a> in which a boolean return value tells if the file should be written to disk.</p>
<p><strong>webpack.config.js</strong></p>
<pre><code class="hljs language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">//...</span>
devServer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
writeToDisk<span class="token punctuation">:</span> <span class="token punctuation">(</span>filePath<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token operator">/</span>superman\<span class="token punctuation">.</span>css$<span class="token operator">/</span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>filePath<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span></code></pre>
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