Features

• Refactor the startup logic to improve library support
• add __webpack_runtime_id__ to access the current runtime id
• improve error handling for HMR
  • add second argument to self accept error handler to pass new module and module id
  • add error handler argument to dependency accept, passing error and module ids
• add output.strictModuleErrorHandling to opt into stricter evaluation error handling semantics according to ESM spec
  • used by default when HMR is enabled
• when ignoring a module used by new URL() this will result in an url to a empty file ("data:,")
• add module.generator.asset.emit option to disable creating assets from asset modules (e. g. for SSR)

Bugfixes

• fix problem when library options apply to a non-runtime chunk
• fix crash in splitChunks.maxSize where negative indicies are accessed
• fix sub-optimal splitting of splitChunks.maxSize in some cases when multiple size types are involved
• fix a memory leak in AssetGenerator
• fix usage of runtime globals in SharedPlugin to support HMR updates

Deprecations

• deprecate output.strictModuleExceptionHandling (this is the CommonJS way of handling errors, and the name is weird)