Patch Changes

• Resolve aliases pointing at a package directory whose name ends with .js again. (by @alexander-akait in #21542)

• Name CSS sources in source maps by their resource path, without the css prefix. (by @bjohansebas in #21536)

• Delete no longer referenced files from the filesystem cache directory after storing the cache, age them by recorded time so restored caches are cleaned too, and collect every fully expired pack in one store instead of one per build. (by @bjohansebas in #21528)

• Report "universal" as the loader context target for the universal target. (by @alexander-akait in #21540)

• Skip require().prop in dead branches gated by inlined imported constants. (by @hai-x in #21517)

• Annotate configuration options and public hooks in the generated types with the @since JSDoc tag. (by @bjohansebas in #21473)

Patch Changes

• Fix stray semicolon emitted before an imported call following a parenthesized sequence element. (by @alexander-akait in #21533)

• Make require(esm) module.exports re-export analysis independent of module processing order. (by @alexander-akait in #21521)

• Ignore ERR_SERVER_NOT_RUNNING on lazy-compilation backend dispose so compiler.close() succeeds on Bun. (by @alexander-akait in #21521)

• Name the failing key when DefinePlugin fails to evaluate a typeof value. (by @alexander-akait in #21503)

• Improve Deno compatibility: guard setNoDelay and force-close connections on lazy-compilation backend dispose, and return a real ArrayBuffer from the Node async/sync wasm loader so WebAssembly.instantiate accepts it. (by @alexander-akait in #21524)

• Speed up the HTML parser and cut its peak memory: module-scope helpers/state and tokenizer callbacks, plus exact AST column pre-sizing. (by @alexander-akait in #21492)

• Track CommonJS build dependencies by parsing sources when require.cache children are unavailable (e.g. Bun). (by @alexander-akait in #21531)

• Cook common string-literal escapes on the JS parser fast path and own the tokenizer's cold-path readers. (by @alexander-akait in #21500)

• Build the CSS parseA* AST on the SoA store instead of node classes, cutting parse memory and time. (by @alexander-akait in #21498)

• Speed up and cut memory of the experimental CSS and HTML parsers: drop two derivable AST node columns, and scan long string, url, comment, and plaintext token bodies natively. (by @alexander-akait in #21504)

• Speed up non-modules CSS parsing: skip redundant token re-reads, drop selector-prelude tokens without materializing nodes, allocate rule preludes lazily, and fast-path empty list seals. (by @alexander-akait in #21511)

• Speed up stats generation and cut its peak memory: reuse cached sort comparators instead of thrashing the comparator caches on every sort, and drop redundant module-graph lookups and allocations in the extractors. (by @alexander-akait in #21506)

• Speed up CSS parsing: byte-range function-name checks, indexed sibling lookahead. (by @bjohansebas in #21520)

• Reduce allocations and redundant work across the code-generation, module-concatenation, exports/usage-analysis, hashing, and chunk-splitting hot paths. (by @alexander-akait in #21516)

• Enable the Node.js compile cache in the webpack CLI entry point. (by @bjohansebas in #21523)

• Encode the persistent cache with V8's value serializer. (by @avivkeller in #21514)

• Speed up SplitChunksPlugin: reject non-subset chunk sets with 64-bit signatures, cache unnamed entry keys, and drop per-module closures. (by @avivkeller in #21529)

• Initialize NormalModule._ast in the constructor so each instance keeps a single hidden-class shape. (by @alexander-akait in #21515)

• Reduce allocations in the binary serialization hot paths. (by @alexander-akait in #21526)

• Deduplicate and simplify several lib modules and speed up AggressiveMergingPlugin. (by @alexander-akait in #21525)

• Rename nested const/let __webpack_require__ and __webpack_exports__ declarations in bundled webpack output. (by @hai-x in #21508)

Minor Changes

• Default experiments.typescript to "auto", enabling built-in TypeScript support on Node.js >= 22.6 when no TypeScript loader is registered. (by @alexander-akait in #21477)

• Default experiments.css, experiments.html and experiments.asyncWebAssembly to "auto", enabling built-in support unless a loader is registered for those files; modules with inline or hook-injected loaders (e.g. html-webpack-plugin templates) keep being parsed as JavaScript. (by @alexander-akait in #21477)

• Add output.resourceHints to emit resource hints (preload/prefetch/modulepreload/preconnect), on by default for ESM output, plus module.parser.<type>.urlHints, css.fontPreload and javascript.dynamicImportCssPreload. (by @alexander-akait in #21477)

• Add built-in build progress via infrastructureLogging.progress, plus estimatedTime, phaseTimings, progress bar width and progressBar: "auto" on ProgressPlugin. (by @alexander-akait in #21477)

• Concatenate CommonJS modules with statically analyzable exports; opt out via optimization.concatenateModules: { commonjs: false }. (by @alexander-akait in #21477)

• Wrap "weird" CommonJS modules into module concatenation instead of bailing out. (by @alexander-akait in #21477)

• Add output.html.inline (true | "script" | "style") and the webpackInline magic comment to inline chunk content into HTML. (by @alexander-akait in #21477)

• Add output.html.inject to control where chunk tags are injected. (by @alexander-akait in #21477)

• Add output.html.title, output.html.meta and output.html.base options for head generation. (by @alexander-akait in #21477)

• Support per-icon link attributes (sizes, media, color, type, crossorigin) and arrays in output.html.favicon. (by @alexander-akait in #21487)

• Add output.html.manifest to generate and link a web app manifest with hashed icons. (by @alexander-akait in #21487)

• Add output.html.csp to inject a Content-Security-Policy meta with inline-content hashes and an optional nonce. (by @alexander-akait in #21487)

• Add the output.html injectTags compilation hook to inject tags (script/link/meta/…) with injectTo placement. (by @alexander-akait in #21487)

• Add the output.html transformTags compilation hook to mutate, remove, or move (between <head> and <body>) a page's existing <script>/<link>/<style>/<meta> tags. (by @alexander-akait in #21487)

• Extend the HTML pipeline with html link sources (bundled as their own emitted page) and rel="preload"/"prefetch" links bundled as chunks. (by @alexander-akait in #21477)

• Recognize more asset-bearing HTML sources: the twitter:player:stream meta, legacy SVG references, and Web App Manifest icons/screenshots/shortcuts URLs. (by @alexander-akait in #21477)

• Add module.parser.html.as to parse HTML as a document or an element fragment. (by @alexander-akait in #21477)

• Allow disabling a built-in HTML parser source via type: false in sources. (by @alexander-akait in #21477)

• Export webpack.html.HtmlModulesPlugin with transformHtml/htmlEmitted compilation hooks. (by @alexander-akait in #21477)

• Resolve @custom-media (including media-type values) and @custom-selector in native CSS. (by @alexander-akait in #21477)

• Scope view-transition-name/-group/-class names and ::view-transition-*() pseudo references in CSS modules under customIdents. (by @alexander-akait in #21486)

• Add import.meta.glob support, with a caseSensitive option and consistent hidden/node_modules matching. (by @alexander-akait in #21477)

• Resolve import.meta.resolve("./asset") to the emitted asset URL via the importMeta.resolve parser option. (by @alexander-akait in #21477)

• Add import.meta.env defaults: MODE, DEV, PROD, SSR and BASE_URL. (by @alexander-akait in #21477)

• Add fine-grained import.meta parser options. (by @alexander-akait in #21477)

• Deprecate the importMetaContext parser option in favor of importMeta.webpackContext. (by @alexander-akait in #21477)

• Emit analyzable new URL(…, import.meta.url), worker/worklet URL and import() references with literal specifiers for ESM module output. (by @alexander-akait in #21477)

• Compile async modules to generators for targets without async/await. (by @alexander-akait in #21477)

• Evaluate and validate the second argument of dynamic import(specifier, options). (by @alexander-akait in #21477)

• Add module.parser.javascript.worklet to bundle Worklet addModule() entries. (by @alexander-akait in #21477)

• Add ?raw, ?url, ?inline and ?no-inline asset query suffixes under experiments.futureDefaults. (by @alexander-akait in #21477)

• Add an interop ("default" | "esModule") hint for object externals to control default-export interop. (by @alexander-akait in #21477)

• Add an amd-async externals type that loads AMD externals without an AMD library wrapper. (by @alexander-akait in #21477)

• Support cache.compression: "zstd" for the filesystem cache. (by @alexander-akait in #21477)

• Warn on strict-mode-only syntax and semantic hazards in ES module output, configurable via the strictModeViolations parser option. (by @alexander-akait in #21477)

• Support parsers without location APIs: locations derive from node offsets and AST nodes no longer carry loc. (by @alexander-akait in #21477)

• Attach the original DOM event to ChunkLoadError and ScriptExternalLoadError as error.event. (by @alexander-akait in #21477)

• Add output.wasmStreamingFallback for wasm fallback on a wrong MIME type. (by @alexander-akait in #21477)

• Show why a module was marked as not cacheable in stats output. (by @alexander-akait in #21477)

• Expose the active MultiWatching on MultiCompiler.watching. (by @alexander-akait in #21477)

• Resolve git merge conflicts when parsing the build-http lockfile. (by @alexander-akait in #21477)

Patch Changes

• Fix broken HMR with output.module and non-import chunk loading by emitting a plain-JSON hot-update manifest. (by @alexander-akait in #21477)

• Fix unused CSS module exports leaking into the JS wrapper. (by @alexander-akait in #21477)

• Fix deferred import evaluation: re-t...

Patch Changes

• Speed up non-CSS-Modules parsing by not building unused selector AST nodes. (by @alexander-akait in #21324)

• Speed up non-CSS-Modules CSS parsing by dropping value tokens nothing reads. (by @alexander-akait in #21324)

• Resolve HTML asset URLs against the document <base href>. (by @alexander-akait in #21329)

• Add HTML integration tests: generateError output, ignored src, null-char parse. (by @aryanraj45 in #21328)

• Reduce CPU and memory overhead of HTML and CSS parsing and code generation. (by @alexander-akait in #21332)

• Reduce HTML parser memory and CPU by skipping unused AST nodes. (by @alexander-akait in #21323)

• Reduce HTML parser memory by storing the AST in struct-of-arrays form. (by @alexander-akait in #21331)

• Key the provided-exports cache on a lazy barrel's still-lazy re-export targets. (by @hai-x in #21326)

• Default output.globalObject to globalThis for universal targets. (by @alexander-akait in #21314)

• Pass through new URL(...) directory references instead of resolving them. (by @alexander-akait in #21312)

Patch Changes

• Speed up CSS parsing and reduce CSS AST node memory. (by @alexander-akait in #21285)

• Fix HMR codegen crash for harmony accept with unresolved imports. (by @xiaoxiaojx in #21302)

• Match harmony accept dependencies by module reference so HMR codegen handles imports without a module or chunk id. (by @alexander-akait in #21303)

Patch Changes

• Fix lazy barrel deferral of ungrouped side-effect imports. (by @hai-x in #21291)

• Respect the node: prefix for node.js core modules used as externals. (by @alexander-akait in #21286)

Patch Changes

• Fix invalid property access for escaped namespace imports with multi-character mangled export names. (by @xiaoxiaojx in #21280)

• Add frames to ProfilingPlugin TracingStartedInBrowser event so the trace loads in Chrome DevTools. (by @alexander-akait in #21269)

Minor Changes

• Treat top-level await and import.meta as ES module markers, matching Node.js syntax detection so no explicit module type is needed. (by @alexander-akait in #21218)

• Add a bun target that emits ESM and externalizes bun:* and node.js built-in modules. (by @alexander-akait in #21248)

• Support CommonJS reexports via Object.defineProperty value and getter descriptors. (by @alexander-akait in #21129)

• Support JSON Schema const when generating CLI flags from a schema. (by @alexander-akait in #21087)

• Support JSON Schema if/then/else when generating CLI flags from a schema. (by @alexander-akait in #21087)

• Skip import specifiers, require() and import() calls in dead conditional branches gated by inlined imported constants (isDEV ? A : B), evaluated via getCondition. (by @hai-x in #21136)

• CSS localIdentName [hash] now resolves to the local ident hash (matching css-loader); use [modulehash] for the module hash. (by @alexander-akait in #21259)

• Add CSS parser as option and resolve url() inside HTML style attributes. (by @alexander-akait in #21157)

• Add dedicated module classes for all built-in module types. (by @alexander-akait in #21164)

• Support .html/.css for the default ./src entry under the html/css experiments. (by @alexander-akait in #21039)

• Add defineConfig helper for typed configuration files. (by @alexander-akait in #21169)

• Add a deno target (with versions, e.g. deno, deno2, deno1.40) that emits ESM, resolves node.js built-ins via the required node: specifier, and keeps Deno's own import protocols (npm:, jsr:, node:, http(s)://) external. (by @alexander-akait in #21247)

• Use module-import for electron externals when the target supports ESM. (by @alexander-akait in #21184)

• Add output.environment.logicalAssignment to emit ||= in runtime code when the target supports logical assignment operators. (by @bjohansebas in #21219)

• Resolve and rewrite asset URLs inside <iframe srcdoc> in HTML modules. (by @bjohansebas in #21226)

• Add HMR support for HTML modules with body/title DOM patching on update. (by @alexander-akait in #21011)

• Add css-url html source type extracting url() references from CSS-valued attributes. (by @alexander-akait in #21250)

• Add module.parser.html.sources option to disable or customize URL-attribute extraction for HTML modules, with script / script-module / stylesheet / stylesheet-inline types for custom attributes (by @alexander-akait in #21022)

• Add module.parser.html.template option to transform HTML module source before parsing. (by @alexander-akait in #21055)

• Extract more source URLs in HTML modules (SVG, legacy and obsolete attributes). (by @alexander-akait in #21241)

• Inline export default <const> when the default-exported value is a primitive constant. (by @hai-x in #21189)

• Support optimization.inlineExports for better tree-shaking. (by @hai-x in #20973)

• Re-encode inline hash digests ([contenthash]/[chunkhash]/[fullhash]/[modulehash]) from the full content hash, so they carry full entropy and work under optimization.realContentHash and in dynamically-loaded chunk filenames; also preserve leading zero bytes in base-N digests. (by @alexander-akait in #21267)

• Allow tree-shaking unused calls to /*#__NO_SIDE_EFFECTS__*/-annotated (pure) exports across module boundaries. (by @hai-x in #20907)

• Defer building unused re-export targets of side-effect-free barrel modules. (by @hai-x in #21165)

• Keep export mangling enabled for modules whose namespace object is used as a whole value, by materializing a decoupled namespace object that keeps the original export names. (by @alexander-akait in #21234)

• Add output.environment.let option (paired with target's let capability) and emit let/const instead of var in generated runtime code wherever it is safe. Bindings that may be wrapped in runtime-condition if blocks (harmony imports, ConcatenatedModule external imports) continue to use var to preserve function scoping. (by @alexander-akait in #21010)

• Add output.html to emit an HTML file per entrypoint, injecting its JS/CSS chunks (including dependOn shared chunks). (by @alexander-akait in #21215)

• Add module.parser.javascript.pureFunctions to mark top-level names as side-effect-free for tree shaking. (by @hai-x in #21063)

• Add universal to compiler.platform, true for universal targets ("universal" or ["web", "node"]). (by @bjohansebas in #21252)

• Add output.strictModuleResolution to gate the runtime MODULE_NOT_FOUND guard. (by @hai-x in #21067)

• Support an inline digest in hash path placeholders, e.g. [contenthash:base64:8]. (by @alexander-akait in #21259)

• Support [uniqueName] and its [uniquename] alias in template paths. (by @alexander-akait in #21155)

• Support CSS in Node for universal targets, collecting styles for SSR. (by @alexander-akait in #21208)

• Improve commonjs, node-commonjs and global externals for universal targets. (by @alexander-akait in #21187)

• Add a universal target preset (browser + web worker + Node.js + Electron + NW.js) that always outputs ECMAScript modules. (by @alexander-akait in #21214)

• Support new Worker(new URL(...)) in universal (node + web) targets by resolving the Worker constructor from worker_threads when no global Worker exists. (by @alexander-akait in #21195)

• Add output.workerChunkFilename and entry.worker for worker chunk filenames. (by @alexander-akait in #21128)

Patch Changes

• Skip re-parsing the inlined entry module when no renaming is needed. (by @alexander-akait in #21167)

• Extend the avoidEntryIife no-parse fast path to multi-entry chunks. (by @alexander-akait in #21173)

• Reuse the binary deserialize dispatch table to speed up cache restore. (by @alexander-akait in #21175)

• Type buildInfo and buildMeta per module type with shared common properties. (by @alexander-akait in #21172)

• Avoid copying module runtime requirements when ownership is not transferred. (by @alexander-akait in #21140)

• Keep all CommonJS exports when an exported function accesses them via this. (by @alexander-akait in #21179)

• Align CLI color...

Patch Changes

• Reduce per-file overhead in ContextModuleFactory.resolveDependencies by batching alternativeRequests hook calls. Previously the hook was invoked once per file in the context (with a single-item array), paying per-call overhead (closure allocation, resolverFactory.get, intermediate arrays in RequireContextPlugin) for every file. The hook is now invoked once per directory with all matched files in one batch — RequireContextPlugin's tap already iterates the items array, so the output is unchanged. Steady-state rebuild on a 4000-file require.context drops a further ~15 ms (after the watch-mode purge fix in the same release). (by @alexander-akait in #21020)

• Include each external info's runtimeCondition in ConcatenatedModule#updateHash so changes to a concatenated external's runtime condition invalidate persistent caches instead of slipping through with the module id alone. (by @alexander-akait in #21023)

• Fix HTML [contenthash] for referenced asset and inline-style URL changes. (by @alexander-akait in #21018)

• Resolve chunk-hash placeholders in chunk URLs embedded into extracted HTML. (by @alexander-akait in #21018)

• Remove unnecessary __webpack_require__ runtime helpers in ESM library output with multi-module chunks. (by @xiaoxiaojx in #21032)

• Rewrite NormalModule#getSideEffectsConnectionState walk as an allocation-light iterative loop instead of a generator trampoline, restoring rebuild performance lost in #20993 while keeping deep import chains stack-safe. (by @alexander-akait in #21014)

• Fix runtime ReferenceError on the first activation of a lazy-compiled module when output.library.type produces a closure-wrapped bundle (umd, umd2, amd, amd-require, system). (by @alexander-akait in #21013)

  External modules of these types reference closure-bound identifiers like __WEBPACK_EXTERNAL_MODULE_react__, supplied by the library wrapper that is generated once per chunk. When lazyCompilation activates an entry or import for the first time, any external dependency the lazily-built module pulls in arrives in a hot-update chunk that lives outside the original wrapper closure, so its factory body cannot resolve the closure identifier and only a manual page refresh recovers.

  The inactive LazyCompilationProxyModule now declares statically-enumerable externals (string and object forms of externals) as its own dependencies, so the initial entry chunk's library wrapper already exposes their closure identifiers. When activation later pulls in those externals through the lazily-compiled module, they resolve to the already-installed factories instead of throwing. Function and RegExp externals are not pre-populated because their effective request set isn't knowable up front.

• Fill in missing entryOptions when an async block joins an existing entrypoint. (by @alexander-akait in #21026)

• Release per-child codeGenerationResults in MultiCompiler and at Compiler.close to reduce memory retention. (by @alexander-akait in #21015)

• Reduce peak memory of SourceMapDevToolPlugin on large builds (closes #20961). (by @alexander-akait in #20963)

• Fix slow require.context() / dynamic import() rebuilds in watch mode (#13636). When a file inside a watched context directory changed, NodeWatchFileSystem would call inputFileSystem.purge(contextDir). The enhanced-resolve purge implementation matches cache keys with key.startsWith(contextDir), so the stat cache of every file under the directory was discarded on every rebuild — ContextModuleFactory.resolveDependencies then re-stat-ed the whole tree on each rebuild. Single-file rebuilds on a 4000-file context now reuse the warm stat cache, dropping median rebuild from ~1260 ms to ~650 ms in a local reproduction (≈49%). For directory items that are explicitly watched contexts, purge is now called with { exact: true } (added in enhanced-resolve@5.22.0) so only the directory's own entry is invalidated; file-level changes in the same aggregated event continue to purge file stats and the parent readdir as before. (by @alexander-akait in #21020)

Patch Changes

• Align the experimental HTML tokenizer with the WHATWG spec: fix offset-range bugs in the script-data, content-mode end-tag, attribute-value, and EOF states; surface tokenizer parse errors to consumers via a new parseError callback ("warning" when the tokenizer recovers and the emitted token is still well-formed, "error" when the offset range is incomplete — e.g. eof-in-tag); and add the full WHATWG named character references table so decodeHtmlEntities handles all named entities (including legacy bare forms like &AMP and multi-code-point entities like ≂̸) with proper longest-prefix backtracking. (by @alexander-akait in #21000)

• Tree-shake CommonJS modules imported through a const NAME = require(LITERAL) binding when only static members of NAME are read. Previously webpack treated every export of such modules as referenced (because the bare require() dependency reports EXPORTS_OBJECT_REFERENCED), so unused exports.x = ... assignments remained in the bundle even with usedExports enabled. The parser now forwards NAME.x / NAME.x() / NAME["x"] accesses to the underlying CommonJsRequireDependency as referenced exports, falling back to the full exports object the moment NAME is read in any other context (passed by value, destructured later, accessed with a dynamic key, …). This brings the binding form to parity with the existing destructuring form (const { x } = require(...)). (by @alexander-akait in #21003)

• Fix RangeError: Maximum call stack size exceeded thrown from HarmonyImportSideEffectDependency.getModuleEvaluationSideEffectsState on long linear chains of side-effect-free imports. NormalModule.getSideEffectsConnectionState previously descended through HarmonyImportSideEffectDependency.getModuleEvaluationSideEffectsState recursively, adding two stack frames per module, which overflowed V8's stack at a few thousand modules deep. The traversal is now iterative. (by @alexander-akait in #20993)

• Fix NormalModuleFactory parser/generator types: (by @alexander-akait in #20999)

  • module.generator.html now uses HtmlGeneratorOptions instead of EmptyGeneratorOptions (the extract option was hidden from the createGenerator / generator hook types).
  • WebAssembly (webassembly/async, webassembly/sync) generator hooks now use EmptyGeneratorOptions instead of EmptyParserOptions.
  • NormalModuleFactory#getParser / createParser / getGenerator / createGenerator are now generic over the module-type string, returning the specific parser/generator class for known types (e.g. JavascriptParser for "javascript/auto", CssGenerator for "css", etc.) instead of always returning the base Parser / Generator.
  • NormalModuleCreateData is now generic over the module type so parser, parserOptions, generator, and generatorOptions are narrowed to the specific class / options for the given type.

• Link import bindings used inside define(...) callbacks in ES modules. Previously, HarmonyDetectionParserPlugin skipped walking the arguments of define calls in harmony modules, so references to imported bindings inside an inline AMD define factory (e.g. define(function () { console.log(foo); })) were not rewritten to their imported references and could cause ReferenceError at runtime. Inner graph usage analysis is also fixed for the related pattern const fn = function () { foo; }; define(fn);. (by @alexander-akait in #20990)

• HTML-entry pipeline (experiments.html + experiments.css): emit <link rel="stylesheet"> tags for CSS chunks reachable from a <script src> entry. Previously when the bundled JS imported CSS, the resulting .css file was emitted to disk but never referenced from the extracted HTML (no <link> tag), and when splitChunks extracted CSS into sibling chunks the HTML cloned the originating <script> for each one — producing <script src="style.js"> pointing at non-existent JS filenames instead of <link rel="stylesheet" href="style.css">. CSS chunks are now sorted by the entrypoint's module post-order index so the <link> tags also appear in source import order, fixing the cascade ordering issue documented in html-webpack-plugin#1838 and webpack/mini-css-extract-plugin#959 for HTML-entry builds. nonce/crossorigin/referrerpolicy are copied from the originating tag onto the emitted <link>. (by @alexander-akait in #21002)

• Allow devtool and SourceMapDevToolPlugin (or multiple SourceMapDevToolPlugin instances) to coexist on the same asset. Previously the second instance would silently skip any asset whose info.related.sourceMap had already been set by an earlier instance, and even when it ran the asset had been rewrapped as a RawSource so no source map could be recovered — producing an empty .map file. The plugin now keeps a per-compilation stash of pristine source maps, namespaces its persistent cache entries by the options that affect output, and appends additional related.sourceMap entries instead of overwriting them. The classic workaround of pairing devtool: 'hidden-source-map' with a new webpack.SourceMapDevToolPlugin({ filename: '[file].secondary.map', noSources: true }) now produces both maps in a single build. (by @alexander-akait in #21001)

• Narrow TemplatePathFn callback types by context. pathData.chunk is now non-optional for chunk filename callbacks (output.filename, chunkFilename, cssFilename, cssChunkFilename, htmlFilename, htmlChunkFilename, optimization.splitChunks.cacheGroups[*].filename), and pathData.module is non-optional for module filename callbacks (output.assetModuleFilename, per-module generator.filename / generator.outputPath, module.parser.css.localIdentName). (by @alexander-akait in #20987)

• Tighten the CreateData typedef in NormalModuleFactory. CreateData now represents the fully-populated value passed to the createModule, module, and createModuleClass hooks (NormalModuleCreateData & { settings: ModuleSettings }), while ResolveData.createData is typed as Partial<CreateData> to reflect the empty initial state. Plugins tapping those hooks no longer need to cast individual fields away from optional. (by @alexander-akait in #20992)

• Stop webpackPrefetch / webpackPreload magic comments from leaking across import() call sites that share a webpackChunkName. When two imports targeted the same named chunk and only one of them set webpackPrefetch: true, the prefetch directive was applied from every parent chunk that referenced the named chunk. Prefetch and preload orders are now resolved per import() call site instead of from the shared chunk group's accumulated options. (by @alexander-akait in #20994)

• Fix [fullhash:N] and [hash:N] (with length suffix) in output.publicPath not being interpolated at runtime. The detection regex in RuntimePlugin only matched [fullhash] / [hash] without a length suffix, so the PublicPathRuntimeModule was not flagged as a full-hash module and __webpack_require__.p was emitted with the placeholder XXXX left in place (e.g. out/XXXX/) instead of the real hash truncated to the requested length. (by @alexander-akait in #21004)

• Re-export ModuleNotFoundError from webpack/lib/ModuleNotFoundError for backward compatibility with old plugins that import it from that path. This re-export will be removed in webpack 6. (by @alexander-akait in #20988)