Features

• add script external type, which allows to load a global from a script tag
• allow entry: {} for no entries
• allow magic comment in import() for used exports
  • /* webpackExports: "default" */
  • /* webpackExports: ["named", "default"] */
• add support for the "exports" field in package.json
• add resolve.restrictions to restrict the paths a request can resolve to
• ModuleFederationPlugin
  • change defaults to use script as remoteType by default
  • for module requests in shared (like shared: ["package", "package/sub/path"])
    • this will apply only the references to modules that match this shared module
    • requiredVersion will be extracted from package.json of the consumer automatically
      • new packageName option allow to choose the package name for the dependencies lookup (or dev/peer/optionalDependencies)
      • requiredVersion: false allows to disable this
    • This means webpack will look for cases in your source code where your are using something like import "package". The next package.json for the referencing module is used to determine a requiredVersion. The resolved result will be provided as shared module in the version of the package.json at the resulting location.
  • for relative requests in shared (like shared: ["./relative/path"])
    • will resolve relative to context
    • doesn't depend on usage in the build. Always provided.
    • do not use a requiredVersion by default. Only when specified or packageName is specified.
    • This means webpack will resolve the relative request and provide the result as shared module in the version of the next package.json found at the location of the result. All requests resolving to the same file location will consume the shared module without any required version check.
  • module requests with tailing / in shared (like shared: ["package/"])
    • will match all module request with this prefix
    • otherwise behave like normal module requests

Bugfixes

• Fix a bug in HMR runtime code that causes a crash with Cannot read property 'hot' of undefined.

Known Problems

• ~The transitive move-file dependency requires node >= 10.17, while webpack is intended to be >= 10.13 compatible. This temporary increases the min node version for this beta release until we found a solution to that.~
  • Fixed, latest patch releases are >= 10.13 compatible

Features

• Using module in an ESM no longer needs the whole namespace object
• SideEffects flag can follow reexports that are partially dynamic or use a compat default
• export * uses more exports info data for better exports
• dynamic export * no longer flags the default export as maybe provided
• allow module concatenation even when provided exports are unknown, but used exports are known
• add promise external, which is like var but awaits the global value in a async module
• add import external, which uses import() to load a native ESM
• add output.importFunctionName to change the import() to something else, e.g. to a polyfill.
• remove some unneeded dependencies
• Module Federation
  • removed scope shortcut object config for container plugins (BREAKING)
  • add ability to pass advanced options to container plugins
  • allow to expose an array of modules (similar to entry)
  • allow to provide an array of remote locations (they act as fallback)
  • await when a promise is returned by the external
  • allow to expose an index module which is used when using the remote without subpath
  • change exposed keys to be prefixed with ./ (BREAKING)
  • automatically inferred keys do no longer omit leading non-word chars
  • add version handling to shared modules (see https://github.com/webpack/webpack/pull/10960 for details, BREAKING)

Bugfixes

• export default no longer converts function declarations to expressions
• inline external type can also provided when using an array external.
• fixed a bug in snapshotting that caused changes to be ignored during watching
• add missing dependency for correct typings
• Persistent Caching
  • DllPlugin related classes are now serializable
  • Dates are serializable

Changes

• merged all asset processing hooks into a new hook processAssets with stages
• Modifications to compilation.asset after sealing are deprecated

Features

• added experimental "Module Federation" - a way to load modules from separate builds into one application
  • read more about the concepts here: https://github.com/webpack/changelog-v5/blob/master/guides/module-federation.md
• improve error messages when wasm experiments are disabled
• expose some webpack options types in typings
• added more details to ProgressPlugin

Bugfixes

• refactor exports info logic for CommonJs exports
  • fixes a bug when using an export named default in CommonJs
• record chunk id using chunk group name and index in it
  • fixes a bug when using HMR and split-chunked initial chunk
• also set parents in module graph when using non-recursive module creation
  • fixes crash in harmony dependency when using this.loadModule with imports
• force upgrade terser-webpack-plugin for memory leak bugfix
• fix small non-monotony in the ProgressPlugin
• track runtime modules that need a full hash and calculate it
  • fixes a bug where main.js is not updated on a HMR update
  • This caused that all previous HMR updates are applied on reload

Contributing

• CI tests node.js 14 instead of 13 now
• ignore code coverage for timing dependent code

Full Changelog

Feedback

Breaking Changes

• generate and expose typescript typings from webpack

Features

• add API to generate and process CLI arguments targeting webpack configuration
• add __system_context__ as context from System.js when using System.js as libraryTarget
• add module.hot.invalidate() API to trigger an additional hot update of this module
• add bigint support for the DefinePlugin
• add bigint support for basic evaluations like maths

Bugfixes

• fix a ReferenceError: xxx is not defined where some pure expression where not be removed from the code
• fix handling of extends in class when class is unused
• fix incorrect schema validation for Rule conditions (include, exclude and test are not valid here)
• fix some spelling issues
• add space between value and unit in output
• fix generated code when using the DefinePlugin with -0
• Exports from System.js externals behave correctly as ESM now

Improvements

• remove some duplication info in seralization
• make descriptions in schema more consistent in formating

Internal

• add spellcheck to CI

Full Changelog

Feedback

Changes

• optimization.sideEffects, optimization.innerGraph and optimization.usedExports are on by default now (only production before)
  • Motivation: less difference between prod and dev builds, getting sideEffects benefits in dev mode.
• EnvironmentPlugin shows an error now when referenced env variable is missing and has no fallback
  • Motivation: Builds should fail when an expected env variable is missing
• Remove serve property from schema
  • Motivation: No longer needed, as this has move to a plugin
• merge all library related options into output.library
  • output.library: { type, name, export, auxiliaryComment, umdNamedDefine }
  • old options are still possible, but no longer recommended
  • Motivation: more clear structure, easier sharing with library in the entry option

Features

• Allow a entry description object for advanced entrypoint configuration
  • entry: { main: { ... } }
  • import: list of modules
  • filename: custom filename template
    • Using output.chunkFilename is no longer recommended and only output.filename should be used now
  • dependOn: list of other entrypoint which are expected to be available on page
  • library: library exposing
• add percentBy option to ProgressPlugin to change percent calculation
• DefinePlugin supports arrays directly now
• sync wasm support v128 now
• Update PnP support to pnp version 3 (yarn berry)
• add output.uniqueName option
  • defaults to the package.json name in the current directory
  • affects globals used for chunk communication e. g. output.jsonpFunction

DX

• Make Compiler/Compilation.cache property read-only to make it easier to fix compat issues
• ProgressPlugin stores and restores counts from last build to persistent cache for better progress calculation
• Add Did you mean to error message for some common configuration mistakes

Bugfixes

• fix infinite loop when using export * in a circular way
• CLI has non-zero exit code when stdin is not available to ask for webpack-cli installation
• hoist exports in concatenated modules
  • fixes bug with circular dependencies with non-concatenated modules
• generate valid syntax for the injected error code when modules are not found

Refactoring

• Internal refactoring of the inner graph API
• The way the default webpack configuration is created has been refactored
  • New process: 1. configuration is normalized, 2. Plugins are applied, 3. configuration defaults are set
  • This allows plugins to apply their own configuration defaults.
  • This allows to write Configuration Preset Plugins.
• refactor the way library exposing is handled

Performance

• Increase the time logging of the core when using verbose logging
• Performance improvements
  • Chunk Graph
  • Persistent Caching
  • SplitChunks
  • Chunk

Full Changelog

Feedback

Features

• this.getOptions in loader context
  • optionally takes a schema for validation
  • see https://github.com/webpack/webpack/pull/10017 for more information
• Persistent Cache storage has been improved
  • Multiple files instead of one big file. Separate files are created when cache items are unused or unchanged, while trying to keep each file > 1MB
• generator.filename support for type: "asset"/"asset/resource"

Bugfixes

• fix ident handling for Rule.options
• fix handling of watchOptions.aggregateTimeout: 0
• fix default for output.hotUpdatefunction/jsonpFunction/chunkCallbackName when output.library is an array
• fix target: "node" chunk loading when output files are in different folders
• disable constant evaluation in "use asm" code
• fix bug with variable renaming in concatenated modules introduced in 5.0.0-beta.11

Full Changelog

Feedback

Bugfixes

• handled sourceRoot in SourceMaps from modules/loaders
• make order of exports in hashing deterministic to fix a hash change on recompilation
• generate async module code correctly even when no await is used, but other async module is imported
• flag all modules as used when using DllPlugin with entryOnly: false
• fix a race condition in the persistent cache where the cache file is persisted twice in parallel
• upgrade watchpack for incorrectly emitted change events and wrong timestamps
• fix string/number formatting inconsistency in HMR output files
• /*#__PURE__*/ is applied to function calls when doing innerGraph analysis

Changes

• change the default of entryOnly of the DllPlugin to true
• remove special request shortening logic and use single relative paths for readable module names

Features

• allow webpack:// urls in SourceMaps to provided paths relative to webpack root context
• show all possible exports in the warning/error when export was not found or name is incorrect
• treat sequence expression, function and class expressions as pure for innerGraph analysis

Full Changelog

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Bugfixes

• show error when mimetype is missing for type: "asset"
• fix parsing of requires with nesting require("x").fn(require("x"))

Improvements

• rename symbols less often in concatenated modules

Full Changelog

Feedback

Features

• Concatented modules are persistent cacheable now
• add an explanation comment to eval-based devtools about readablilty of output files
• improved profiling mode of progress to display timings per plugin and substep

Bugfixes

• fix a no ChunkGraph assigned crash when using HMR and the mini-css-extract-plugin
• bailout inner graph optimization when a module uses eval()
• detect a cycle in this.loadModule and show error in this case
• allow mangle even if object prototype export names are used
• prevent mangling for object prototype export names in CommonJS
• only treat Object.defineProperty for top-level this as export
• replace Object.defineProperty correctly when value is in brakets

Performance

• add in-memory cache for wrapper code of module factories

Deprecations

• deprecate using string loader option in config
  • prefer passing an object to options

Internal

• refactor prefetch/preload logic into separate plugin to be reusable for other module types

Full Changelog

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Features

• add Tree Shaking for some CommonJS constructs

Refactoring

• split logic from exportType: "default" into separate defaultObject: true|false|"redirect"|"redirect-warn" property
• unhandled calls in parser fall back to expression of call context instead of called function

Full Changelog

Feedback

Features

• add parser.parse option for json module type

Asset experiment

• add module types asset asset/resource asset/inline asset/source
• add parser.dataUrlCondition option
• add generator.dataUrl option

Bugfixes

• resolving from loader context will add resolve dependencies to module dependencies
• fix schema for resolve.plugins

Improvements

• use arrow functions for runtime modules when possible
• add hasOwnProperty helper function to runtime to reduce size of other runtime code

Full Changelog

Feedback

Features

• add deprecation codes to all deprecations
• add Compiler.modifiedFiles with a Set of all modified files in this watchRun
• upgrade watchpack

Bugfixes

• enable chunk reuse of defaultVendors to allow webpackChunkName for vendor-only chunks
• fix a missing runtime requirement when using top level await without exports
• fix missing newlines for stats.errorDetails and stats.errorStacks
• fix a crash in webpack-sources accessing mappings of null (Persistent Cache)

Changes

• Multiple assets emit different content to the same filename is an error now
• parser and generator options are no longer stringified, but parser and generators are cached based on option identity instead
• in strict ESM modules JSON modules have no longer named exports

Refactoring

• rename exportsType = "named" to exportsType = "default"

Bugfixes

• fixes non-deterministic order of entry modules in hashing
• fixed snapshotting of directories
• fix logging of FileSystemInfo for multiple different invalidation reasons
• include runtime modules in chunk hash

Performance

• improve snapshot size of missingDependencies
• move restored data for provided exports in new class

Full Changelog

Feedback

Performance

• Fixes incorrectly inverted logic for cacheWithContext in ResolverCachePlugin

Persistent Caching

• use array instead of map to lookup deserializer in ObjectMiddleware
• More compact serialization for ReplaceSources with many replacements
• webpack-sources ConcatSource uses Buffers for SourceMaps string

Full Changelog

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Features

• add dependencies to ProgressPlugin, enabled by default
• add support for npm fund

Persistent Caching

• make SourceMap and source names in NormalModule context-independent
• upgrade webpack-sources
  • use only public methods for serialization
• add caching support for SourceMapDevToolPlugin (all non eval based source-map devtools)

Bugfixes

• different resolve options are not cached separately
• fix throttling of ProgressPlugin output

Performance

• resolver cache respects resolve.cacheWithContext now, which defaults to false
• merge concurrent resolve request in cache
• newly created file system snapshots are considered as valid now
• avoid creating arrays in ModuleGraph getConnections
• allocate lazily:
  • ModuleGraphConnection.explanations
  • ChunkGraphModule.entryInChunks, ChunkGraphModule.runtimeInChunks
  • Module.warnings, Module.errors
  • NormalModule._sourceSizes, NormalModule.presentationalDependencies
  • Module.factoryMeta
  • ModuleGraphModule.outgoingConnections
• omit unneeded process.nextTicks
• remove return value of ChunkGraph.connectChunkAndModule to skip check
• upgrade webpack-sources
  • cache utf-8 to buffer conversions and reverse
  • cache string to json conversions and reverse
• ProgressPlugin
  • fix throttling of output
• AsyncQueue
  • use setImmediate instead of process.nextTick to schedule the next task
    • This keeps event loop spinning and improved build speed
• hoist some expressions/RegExps

Persistent Caching

• nested plain object are (de)serialize in one pass
• print warning when big strings are serialized
• upgrade webpack-sources
  • avoid serializing strings, prefer Buffers
• allow lazy stringified etags for identity check for memory cache

Full Changelog

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Features

• (deep) keys in JSON modules can be mangled by the optimization.mangleExports
• unused (deep) keys in JSON modules can be droped by the optimization.usedExports
• skip writing output files to disk when they already exist
• Logger.getChildLogger added

Bugfixes

• Reexporting exports from JSON modules works correctly now
• directory listing is correctly invalidated on watch change now (enhanced-resolve)
• fix WatchIgnorePlugin (but it's still deprecated)

Logging

• FileSystemInfo log warnings, errors and the first 40 paths that contribute to invalid snapshots

Performance

• faster serialization when working with deserialized data
• faster emitting when files already exist on disk
• lazy dependency tracking in resolver
• less memory usage in snapshot validation

Full Changelog

Feedback

Performance

• Cache validated snapshots
• Join concurrent snapshot validation requests
• deduplicate Sets in LazySet before merging
• avoid iterating dependencies, iterate connections in the ModuleGraph instead
• add some inline cached for Map access
• upgrade watchpack for performance improvements
• avoid calling getDependencyReference, instead split method into parts and use them on demand
  • enabled/disabled -> connections in ModuleGraph can be conditional
    • It's also great because it's visible in the stats
  • getModule -> ModuleGraphConnection.module
  • importedNames -> getReferencedExports()
  • weak -> Dependency.weak
  • order -> HarmonyImportDependency.sourceOrder
• differ between normal dependencies and cheaper presentational dependencies which are only used for templating and ignored otherwise
• call isOptional only when there are errors

Bugfixes

• fix crash on Watcher.invalidate
• fix problem with retrying import() after it the promise was rejected
• make RequireIncludeDeprecationWarning serialize-able
• fix a bug which failed identifiers to be imported when the free name is already taken by webpack

Full Changelog

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Changes

• hide webpack-internal stack trace of errors in stats by default
• devtool is stricter and supports only this format (false | eval | [inline-|hidden-|eval-][nosources-][cheap-[module-]]source-map)
• remove unused minChunkSize from LimitChunkCountPlugin
• increase minimium node.js version to 10.13.0 (LTS)
• deprecate require.include and emit a warning when used
  • can be changed with parser.requireInclude

Features

• new stats.errorStack option to display webpack-internal stack trace of errors
• optimize module order in chunks for better gzip
• omit trailing whitespace in BannerPlugin
• upgrade to terser-webpack-plugin v2
  • no deprecation warnings

Bugfixes

• fix unparsed expression when evaluating String.concat

Performance

• lazy require webassembly libraries only when wasm is used

Removals

• removed all possible values from cache.store option, only supporting pack mode

Contributing

• reorganize from javascript related files into sub-directory
  • webpack.JavascriptModulesPlugins -> webpack.javascript.JavascriptModulesPlugins
• update dependencies for development

Full Changelog

Feedback

First beta version. :tada:

Please see feedback issue here: https://github.com/webpack/webpack/issues/9802

Features

• output.ecmaVersion can be 5 - 11 or 2009 - 2020
• avoid dynamic require in serialization

(based on 4.41.0)

Deprecation

Main/Chunk/ModuleTemplate deprecation

Bundle templating has been refactored. MainTemplate/ChunkTemplate/ModuleTemplate were deprecated and the JavascriptModulesPlugin takes care of JS templating now.

Before that refactoring JS output was handled by Main/ChunkTemplate while other output (i. e. WASM, CSS) was handled by plugins. This looks like JS is first class, while other output is second class. The refactoring changes that and all output is handled by their plugins.

It's still possible to hook into parts of the templating. The hooks are in JavascriptModulesPlugin instead of Main/ChunkTemplate now. (Yes plugins can have hooks too. I call them attached hooks.)

There is a compat-layer, so Main/Chunk/ModuleTemplate still exist, but only delegate tap calls to the new hook locations.

Features

Entry inlining

Instead of starting bundle execution when a require call, webpack can inline the code of the entrypoint under some conditions now. This means execution starts directly with the first module. This module is inlined into the bundle without module wrapper function.

Runtime-less

The new RuntimeModule architecture allows to add runtime code only when needed. This release reaches a final milestone for this. All runtime code is correctly flagged and only added when needed. This means under some conditions, when no runtime code is needed, we can generate a bundle without runtime (example). In other cases we generate very small runtimes.

Output as module

(experimental: experiments.outputModule: true)

A new option output.module allows to generate output files in a way that <script type="module"> is used. This has multiple effects:

• Lazy-loaded chunks are loaded with <script type="module"> too (output.jsonpScriptType: "module")
• All modules are in strict mode
• The IIFE used for scope isolation is omitted (output.iife: false)
• The default terser config respects that

In future this also means:

• exports from the entrypoint are exposed when imported (output.libraryTarget: "module")
• externals can used import to import another module

Other Features

• The default terser inherits output.terserVersion
• Code Generation is a separate Compilation phase now
  • Better progress reporting
  • Module.source() and Module.getRuntimeRequirements() are deprecated in favor of Module.codeGeneration()
• stats.ids has been added
  • Defaults to false when stats.toString() is used
  • This means module and chunk ids are hidden by default in stats output to make it more user friendly
• stats.chunkModulesSort stats.chunkRootModulesSort stats.nestedModulesSort has been added to sort the different module lists
• stats.modulesSort is "depth" by default now
• stats.chunkModulesSort is "name" by default now
• stats.chunkRootModulesSort is "name" by default now
• stats.nestedModulesSort is false by default now
• stats.children is false for toString() by default now
• added chunk.idHints asset.chunkIdHints asset.auxiliaryChunkIdHints to stats json
• show chunk id hints in stats string output
• ProgressPlugin doesn't show active module count by default now

Full Changelog

Feedback

(based on 4.41.0)

Bugfixes

• fixes handling of circular references in modules in Tree Shaking (optimization.innerGraph)
• fixes compat issue with some plugins which change module._source after module as been already parsed

Full Changelog

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(based on 4.41.0)

Bugfixes

• fixes handling of circular references in modules in Tree Shaking (optimization.innerGraph)

Full Changelog

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(based on 4.41.0)

Compatibility

• add a lot of checks, compat-layers and deprecated methods to allow mini-css-extract-plugin work unmodified

Full Changelog

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(based on 4.40.3)

Changes

• The assetEmitted hook has different arguments now.
  • The second argument is an object containing multiple information now { content: Buffer, source: Source, compilation: Compilation, outputPath: string, targetPath: string }
• SourceMapDevToolPlugin applies to non-chunk assets too now
• SourceMaps are flags as auxiliary files

Full Changelog

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(based on 4.39.3)

Bugfixes

• fix a bug where unused pure expression was inserted into dead branches and caused invalid code
• fix crash where hash was updated with null value during build dependencies handling
• fix error probagation in context hash and timestamping
• fix a bug where hidden files in node_modules where incorrectly threated as modules (i. e. .yarn-integrity)
• fix error handling of managed items on *nix systems
• fix scope handling of try-catch-finally statements
• fix bug where global identifiers where threated as pure expression (they could cause a "not defined" error)

Full Changelog

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(based on 4.39.3)

Bugfixes

• fix a bug with the new scope analysis and side-effect-free modules

Full Changelog

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(based on 4.39.3)

Features

• "Deep Scope Analysis": top level symbols are now tracked in modules when optimization.innerGraph is on (it's on by default in production mode)
  • This allows to track export usage through modules and will flag more exports as unused, reducing bundle size
  • The following constructs are supported:
    • function and class declarations
    • var/let/const declarations of function, arrow function or class expressions
    • var/let/const declarations of expressions annotated with /*#__PURE__*/
    • var/let/const declarations of simple pure expressions like identifiers or literals
• add support for timestamping of directories
• add __webpack_exports_info__.usedExports to get a list of used exports (mainly of testing)
• ContextModules are now serializable/cache-able

Bugfixes

• fix an incorrect output in concatenated modules with unused exports
• fix crash in Persistent Caching when no build snapshot was stored

Full Changelog

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(based on 4.39.3)

Features

• add option output.ecmaVersion to specify level of generated code emitted by webpack
  • By using arrow functions we can emit smaller code, i. e. for exports
  • By using const variables we can emit more correct code for export default

Changes

• (BREAKING) changed default of output.ecmaVersion from implict 5 to 2015
  • This might be incompatible with some older browser.
  • If you need support for these browser use output.ecmaVersion: 5.

Full Changelog

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(based on 4.39.2)

Improvements

• Improve ASI detection to avoid Object(...) in favor of (0,...)
  • This improves bundles size
• Merge multiple exports via __webpack_require__.d into a single statement
  • This improves bundles size

Full Changelog

Feedback

(based on 4.39.2)

Features

• Upgrade to acorn 7
• Persistent Caching
  • track dependencies while resolving build dependencies to snapshot them
  • when build dependencies resolving snapshot is invalid, re-resolve build dependencies to see if something changed
  • new option cache.immutablePaths, similar to cache.managedPaths but assumes that existing content of this folder never changes. Defaults to yarn cache when PnP is used.
  • cache.cacheDirectory defaults to node_modules/.cache/webpack when package.json exists somewhere above cwd, .pnp/.cache/webpack when .pnp.js exists, .cache/webpack otherwise.
• add __webpack_exports_info__ module API

Bugfixes

• fix a bug where external default imports in concatenated modules where incorrectly generated
• improve usage/provision info for nested exports

Full Changelog

Feedback

(based on 4.39.2)

Performance

• Compilation/NormalModuleFactory.file/context/missingDependencies are now LazySets
• Performance improvements in deserialization
• Performance improvements in module graph building

Features

• add cache.managedPaths. It is an array of package-manager only managed paths. webpack will avoid hashing/timestamping them, assume the version is unique and will use this as snapshot (for both memory and filesystem cache).
  • These must be node_modules directories.
  • cache.managedPaths defaults to the node_modules directory webpack is inside of.
• add cache.buildDependencies. It is an object of arrays of additional code dependencies of the build. webpack will use an hash of these items and all dependencies to invalidate the filesystem cache.
  • cache.buildDependencies.defaultWebpack defaults to webpack/lib to get webpack and all dependencies.
  • It's recommended to set cache.buildDependencies.config: [__filename] in webpack.config.js to get the config and all dependencies.

Changes

• Use schema-utils@2 for schema validation
  • validateSchema API now throws an Error instead of returning an Array of Errors
• Persistent Caching uses the infrastructureLogger for logging

Removals

• remove cache.loglevel
  • Use infrastructureLogging.level instead

Full Changelog

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(based on 4.39.1)

Features

• add afterDone hook to Compiler
• upgrade watchpack, which adds watchOptions.followSymlinks
• experimental -> experiments
  • rename webassembly/async-experimental to webassembly/async
  • rename webassembly/experimental to webassembly/sync
  • add experiments.syncWebAssembly
  • add experiments.asyncWebAssembly
• add asset module type experiment
  • add experiments.asset
  • add output.assetModuleFilename (string or function)
  • add type: "asset" for asset module type in rules
  • add asset examples
• separate between files and auxiliaryFiles for chunk assets
  • normal files: JS, CSS (tags need to be added for entrypoints)
  • auxiliary files: WASM, assets, any loader emitted file (no tags need to be added for entrypoints)
  • auxiliary files are displayed in brackets in Stats
• Some core implementations and plugins do some time and statistics logging now (try stats.loggingDebug: /webpack/)
• add Compilation.hooks.stillValidModule similar to failedModule and succeedModule when a module has been taken from cache

Bugfixes

• undefined values are now ignored in rules
• fix schema of resolve.alias when array (properties are now required)
• pass idleTimeout to persistent caching implementation
• fix module done counting for cached modules
• add back stats.cachedAssets
• fix stats option processing for objects with prototype chain
• track call context in concatenated modules correctly

Performance

• upgrade enhanced-resolve to fix some function deopts
• fix some function deopts in webpack
• avoid using toLocaleDateString and toLocaleTimeString for performance (intl need to be initialized)
• ChunkGroup parents and children are no longer sorted
• Stats assigns chunks with assets only once, instead of for every asset
• StatsFactory and StatsPrinter cache used hooks for items
• Hashes for small data < 1kb is cached
• Put deprecation stuff for Sets in prototype instead of on every instance
• Cache Map lookups and create less objects during module dependency processing
• default cache.idleTimeout to 60s instead of 10s

Examples

• add typescript example

Contributing

• add a typing coverage report, to see type coverage of the repo
• upgraded many dependencies

Full Changelog

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(based on 4.35.3)

Features

• update enhanced-resolve to new major: see https://github.com/webpack/enhanced-resolve/releases/tag/v5.0.0-beta.0
  • Yarn PnP
  • more dependencies tracked
  • alias with multiple fallbacks resolve.alias: { something: ["a", "b"] }
  • Performance
  • NodeJsInputFileSystem removed (pass real fs or memfs)

Bugfixes

• fixes resolve.alias: { something: false } to ignore module

Full Changelog

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(based on 4.35.2)

Features

• allow output.filename and splitChunks...filename to be a function
• update watchpack dependency (ignored is added again, avoid fs.watchFile for own polling)

Bugfixes

• fix a case where modules are not added to chunks when using the same name multiple times in splitChunks
• fix an internal use of a deprecated API

Full Changelog

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New Features

• [Security] - Add support for md4 in Node >=18. by @iclanton in https://github.com/webpack/webpack/pull/17628

New Contributors

• @iclanton made their first contribution in https://github.com/webpack/webpack/pull/17628

Full Changelog: https://github.com/webpack/webpack/compare/v4.46.0...v4.47.0

Bugfixes

• fix behavior of defaults for resolve.roots to be backward-compatible

Features

• resolve server-relative requests relative to project context by default

Bugfixes

• fix a bug where splitChunk minSize is not handled correctly
• fix a bug where the order of splitChunk cacheGroups is not handled correctly

Bugfixes

• make sure to generate correct chunk connection for blocks that are only connected in some runtimes
  • fixes a bug where filename contains undefined hash at runtime

Bugfixes

• fix bug in sideEffects optimization when using export * from "non-esm" and a default export.
• add missing optional peerDependencies for webpack-cli and webpack-command to support Yarn 2

Features

• Improve sideEffects flag behavior when dynamic modules are part of the tree
  • Fixes a bug which causes empty modules (or type-only modules) to "break" Tree Shaking
• add splitChunks.enforceSizeThreshold to allow enfore splitting larger chunks unrelated from other limiations
  • Not set by default to avoid breaking change
  • It will be set by default to 50k in webpack 5
  • It's recommended to set it in webpack 4 too
• add support for resolve.roots and default resolve.roots: [context]
  • This allows to resolve server-relative urls (e.g. /src/abc) to the project root (or other locations when configured)
  • This allows to use loaders that rely on that behavior

Bugfixes

• fix bug where splitChunks produced non-optimal results when minSize is set to 0
  • This lead to NaNs in some places which breaks ordering
• Fix bug which lead to HMR not working for splitChunks in entrypoints
• force update watchpack and chokidar for chokidar bugfix which causes files to stop being watched