[DRAFT] 3.4.0 Aggregated Changelog

This is the aggregated changelog for 3.4 that includes changes landed in all alpha and beta pre-releases. For changelog of individual pre-releases, please check here.

Features

general: MathML support (#7836) (d42b6ba), closes #7820
reactivity: more efficient reactivity system (#5912) (16e06ca), closes #311 #1811 #6018 #7160 #8714 #9149 #9419 #9464
reactivity: expose last result for computed getter (#9497) (48b47a1)
runtime-core / dx: link errors to docs in prod build (#9165) (9f8ba98)
runtime-core: add once option to watch (#9034) (a645e7a)
runtime-core: provide full props to props validator functions (#3258) (8e27692)
compiler-core: export error message (#8729) (f7e80ee)
compiler-core: support specifying root namespace when parsing (40f72d5)
compiler-core: support v-bind shorthand for key and value with the same name (#9451) (26399aa)
compiler-core: improve parsing tolerance for language-tools (41ff68e)
compiler-core: support accessing Error as global in template expressions (#7018) (bcca475)
compiler-core: lift vnode hooks deprecation warning to error (8abc754)
compiler-core: export runtime error strings (#9301) (feb2f2e)
compiler-core: add current filename to TransformContext (#8950) (638f1ab)
compiler-sfc: analyze import usage in template via AST (#9729) (e8bbc94), closes #8897 nuxt/nuxt#22416
compiler-sfc: expose resolve type-based props and emits (#8874) (9e77580)
compiler-sfc: bump postcss-modules to v6 (2a507e3)
compiler-sfc: promote defineModel stable (#9598) (ef688ba)
compiler-sfc: support import attributes and using syntax (#8786) (5b2bd1d)
compiler-sfc: defineModel support local mutation by default, remove local option (f74785b), closes /github.com/vuejs/rfcs/discussions/503#discussioncomment-7566278
ssr: add __VUE_PROD_HYDRATION_MISMATCH_DETAILS__ feature flag (#9550) (bc7698d)
ssr: improve ssr hydration mismatch checks (#5953) (2ffc1e8), closes #5063
types: use enum to replace const enum (#9261) (fff7b86), closes #1228
types: add emits and slots type to FunctionalComponent (#8644) (927ab17)
types: export AriaAttributes type (#8909) (fd0b6ba)
types: export ObjectPlugin and FunctionPlugin types (#8946) (fa4969e), closes #8577
types: expose DefineProps type (096ba81)
types: expose PublicProps type (#2403) (44135dc)
types: improve event type inference when using h with native elements (#9756) (a625376)
types: provide ComponentInstance type (#5408) (bfb8565)
types: support passing generics when registering global directives (#9660) (a41409e)

Performance Improvements

compiler-sfc: avoid sfc source map unnecessary serialization and parsing (f15d2f6)
compiler-sfc: remove magic-string trim on script (e8e3ec6)
compiler-sfc: use faster source map addMapping (50cde7c)
compiler-core: optimize away isBuiltInType (66c0ed0)
compiler-core: optimize position cloning (2073236)
codegen: optimize line / column calculation during codegen (3be53d9)
codegen: optimize source map generation (c11002f)
shared: optimize makeMap (ae6fba9)

BREAKING CHANGES

Global JSX Registration Removed

Starting in 3.4, Vue no longer registers the global JSX namespace by default. This is necessary to avoid global namespace collision with React so that TSX of both libs can co-exist in the same project. This should not affect SFC-only users with latest version of Volar.

If you are using TSX, there are two options:

Explicitly set jsxImportSource to 'vue' in tsconfig.json before upgrading to 3.4. You can also opt-in per file by adding a /* @jsxImportSource vue */ comment at the top of the file.
If you have code that depends on the presence of the global JSX namespace, e.g. usage of types like JSX.Element etc., you can retain the exact pre-3.4 global behavior by explicitly referencing vue/jsx, which registers the global JSX namespace.

Note that this is a type-only breaking change in a minor release, which adheres to our release policy.

Deprecated Features Removed

Reactivity Transform was marked deprecated in 3.3 and is now removed in 3.4. This change does not require a major due to the feature being experimental. Users who wish to continue using the feature can do so via the external plugin at https://vue-macros.dev/features/reactivity-transform.html
app.config.unwrapInjectedRef has been removed. It was deprecated and enabled by default in 3.3. In 3.4 it is no longer possible to disable this behavior.
@vnodeXXX event listeners in templates are now a compiler error instead of a deprecation warning. Use @vue:XXX listeners instead.
v-is directive has been removed. It was deprecated in 3.3.