+# [3.4.0 Slam Dunk](https://github.com/vuejs/core/compare/v3.4.0-rc.3...v3.4.0) (2023-12-29)
+
+> Read [this blog post](https://blog.vuejs.org/posts/vue-3-4) for an overview of the release highlights.
+
+### Potential Actions Needed
+
+1. To fully leverage new features in 3.4, it is recommended to also update the following dependencies when upgrading to 3.4:
+
+ - Volar / vue-tsc@^1.8.27 (**required**)
+ - @vitejs/plugin-vue@^5.0.0 (if using Vite)
+ - nuxt@^3.9.0 (if using Nuxt)
+ - vue-loader@^17.4.0 (if using webpack or vue-cli)
+
+2. If using TSX with Vue, check actions needed in [Removed: Global JSX Namespace](https://blog.vuejs.org/posts/vue-3-4#removed-global-jsx-namespace).
+
+3. Make sure you are no longer using any deprecated features (if you are, you should have warnings in the console telling you so). They may have been [removed in 3.4](https://blog.vuejs.org/posts/vue-3-4#other-removed-features).
+
+### Features
+
+* **general:** MathML support ([#7836](https://github.com/vuejs/core/issues/7836)) ([d42b6ba](https://github.com/vuejs/core/commit/d42b6ba3f530746eb1221eb7a4be0f44eb56f7d3)), closes [#7820](https://github.com/vuejs/core/issues/7820)
+* **reactivity:** more efficient reactivity system ([#5912](https://github.com/vuejs/core/issues/5912)) ([16e06ca](https://github.com/vuejs/core/commit/16e06ca08f5a1e2af3fc7fb35de153dbe0c3087d)), closes [#311](https://github.com/vuejs/core/issues/311) [#1811](https://github.com/vuejs/core/issues/1811) [#6018](https://github.com/vuejs/core/issues/6018) [#7160](https://github.com/vuejs/core/issues/7160) [#8714](https://github.com/vuejs/core/issues/8714) [#9149](https://github.com/vuejs/core/issues/9149) [#9419](https://github.com/vuejs/core/issues/9419) [#9464](https://github.com/vuejs/core/issues/9464)
+* **reactivity:** expose last result for computed getter ([#9497](https://github.com/vuejs/core/issues/9497)) ([48b47a1](https://github.com/vuejs/core/commit/48b47a1ab63577e2dbd91947eea544e3ef185b85))
+* **runtime-core / dx:** link errors to docs in prod build ([#9165](https://github.com/vuejs/core/issues/9165)) ([9f8ba98](https://github.com/vuejs/core/commit/9f8ba9821fe166f77e63fa940e9e7e13ec3344fa))
+* **runtime-core:** add `once` option to watch ([#9034](https://github.com/vuejs/core/issues/9034)) ([a645e7a](https://github.com/vuejs/core/commit/a645e7aa51006516ba668b3a4365d296eb92ee7d))
+* **runtime-core:** provide full props to props validator functions ([#3258](https://github.com/vuejs/core/issues/3258)) ([8e27692](https://github.com/vuejs/core/commit/8e27692029a4645cd54287f776c0420f2b82740b))
+* **compiler-core:** export error message ([#8729](https://github.com/vuejs/core/issues/8729)) ([f7e80ee](https://github.com/vuejs/core/commit/f7e80ee4a065a9eaba98720abf415d9e87756cbd))
+* **compiler-core:** support specifying root namespace when parsing ([40f72d5](https://github.com/vuejs/core/commit/40f72d5e50b389cb11b7ca13461aa2a75ddacdb4))
+* **compiler-core:** support v-bind shorthand for key and value with the same name ([#9451](https://github.com/vuejs/core/issues/9451)) ([26399aa](https://github.com/vuejs/core/commit/26399aa6fac1596b294ffeba06bb498d86f5508c))
+* **compiler-core:** improve parsing tolerance for language-tools ([41ff68e](https://github.com/vuejs/core/commit/41ff68ea579d933333392146625560359acb728a))
+* **compiler-core:** support accessing Error as global in template expressions ([#7018](https://github.com/vuejs/core/issues/7018)) ([bcca475](https://github.com/vuejs/core/commit/bcca475dbc58d76434cd8120b94929758cee2825))
+* **compiler-core:** lift vnode hooks deprecation warning to error ([8abc754](https://github.com/vuejs/core/commit/8abc754d5d86d9dfd5a7927b846f1a743f352364))
+* **compiler-core:** export runtime error strings ([#9301](https://github.com/vuejs/core/issues/9301)) ([feb2f2e](https://github.com/vuejs/core/commit/feb2f2edce2d91218a5e9a52c81e322e4033296b))
+* **compiler-core:** add current filename to TransformContext ([#8950](https://github.com/vuejs/core/issues/8950)) ([638f1ab](https://github.com/vuejs/core/commit/638f1abbb632000553e2b7d75e87c95d8ca192d6))
+* **compiler-sfc:** analyze import usage in template via AST ([#9729](https://github.com/vuejs/core/issues/9729)) ([e8bbc94](https://github.com/vuejs/core/commit/e8bbc946cba6bf74c9da56f938b67d2a04c340ba)), closes [#8897](https://github.com/vuejs/core/issues/8897) [nuxt/nuxt#22416](https://github.com/nuxt/nuxt/issues/22416)
+* **compiler-sfc:** expose resolve type-based props and emits ([#8874](https://github.com/vuejs/core/issues/8874)) ([9e77580](https://github.com/vuejs/core/commit/9e77580c0c2f0d977bd0031a1d43cc334769d433))
+* **compiler-sfc:** bump postcss-modules to v6 ([2a507e3](https://github.com/vuejs/core/commit/2a507e32f0e2ef73813705a568b8633f68bda7a9))
+* **compiler-sfc:** promote defineModel stable ([#9598](https://github.com/vuejs/core/issues/9598)) ([ef688ba](https://github.com/vuejs/core/commit/ef688ba92bfccbc8b7ea3997eb297665d13e5249))
+* **compiler-sfc:** support import attributes and `using` syntax ([#8786](https://github.com/vuejs/core/issues/8786)) ([5b2bd1d](https://github.com/vuejs/core/commit/5b2bd1df78e8ff524c3a184adaa284681aba6574))
+* **compiler-sfc:** `defineModel` support local mutation by default, remove local option ([f74785b](https://github.com/vuejs/core/commit/f74785bc4ad351102dde17fdfd2c7276b823111f)), closes [/github.com/vuejs/rfcs/discussions/503#discussioncomment-7566278](https://github.com//github.com/vuejs/rfcs/discussions/503/issues/discussioncomment-7566278)
+* **ssr:** add `__VUE_PROD_HYDRATION_MISMATCH_DETAILS__` feature flag ([#9550](https://github.com/vuejs/core/issues/9550)) ([bc7698d](https://github.com/vuejs/core/commit/bc7698dbfed9b5327a93565f9df336ae5a94d605))
+* **ssr:** improve ssr hydration mismatch checks ([#5953](https://github.com/vuejs/core/issues/5953)) ([2ffc1e8](https://github.com/vuejs/core/commit/2ffc1e8cfdc6ec9c45c4a4dd8e3081b2aa138f1e)), closes [#5063](https://github.com/vuejs/core/issues/5063)
+* **types:** use enum to replace const enum ([#9261](https://github.com/vuejs/core/issues/9261)) ([fff7b86](https://github.com/vuejs/core/commit/fff7b864f4292d0430ba2bda7098ad43876b0210)), closes [#1228](https://github.com/vuejs/core/issues/1228)
+* **types:** add emits and slots type to `FunctionalComponent` ([#8644](https://github.com/vuejs/core/issues/8644)) ([927ab17](https://github.com/vuejs/core/commit/927ab17cfc645e82d061fdf227c34689491268e1))
+* **types:** export `AriaAttributes` type ([#8909](https://github.com/vuejs/core/issues/8909)) ([fd0b6ba](https://github.com/vuejs/core/commit/fd0b6ba01660499fa07b0cf360eefaac8cca8287))
+* **types:** export `ObjectPlugin` and `FunctionPlugin` types ([#8946](https://github.com/vuejs/core/issues/8946)) ([fa4969e](https://github.com/vuejs/core/commit/fa4969e7a3aefa6863203f9294fc5e769ddf6d8f)), closes [#8577](https://github.com/vuejs/core/issues/8577)
+* **types:** expose `DefineProps` type ([096ba81](https://github.com/vuejs/core/commit/096ba81817b7da15f61bc55fc1a93f72ac9586e0))
+* **types:** expose `PublicProps` type ([#2403](https://github.com/vuejs/core/issues/2403)) ([44135dc](https://github.com/vuejs/core/commit/44135dc95fb8fea26b84d1433839d28b8c21f708))
+* **types:** improve event type inference when using `h` with native elements ([#9756](https://github.com/vuejs/core/issues/9756)) ([a625376](https://github.com/vuejs/core/commit/a625376ac8901eea81bf3c66cb531f2157f073ef))
+* **types:** provide `ComponentInstance` type ([#5408](https://github.com/vuejs/core/issues/5408)) ([bfb8565](https://github.com/vuejs/core/commit/bfb856565d3105db4b18991ae9e404e7cc989b25))
+* **types:** support passing generics when registering global directives ([#9660](https://github.com/vuejs/core/issues/9660)) ([a41409e](https://github.com/vuejs/core/commit/a41409ed02a8c7220e637f56caf6813edeb077f8))
+
+
+### Performance Improvements
+
+* **compiler-sfc:** avoid sfc source map unnecessary serialization and parsing ([f15d2f6](https://github.com/vuejs/core/commit/f15d2f6cf69c0c39f8dfb5c33122790c68bf92e2))
+* **compiler-sfc:** remove magic-string trim on script ([e8e3ec6](https://github.com/vuejs/core/commit/e8e3ec6ca7392e43975c75b56eaaa711d5ea9410))
+* **compiler-sfc:** use faster source map addMapping ([50cde7c](https://github.com/vuejs/core/commit/50cde7cfbcc49022ba88f5f69fa9b930b483c282))
+* **compiler-core:** optimize away isBuiltInType ([66c0ed0](https://github.com/vuejs/core/commit/66c0ed0a3c1c6f37dafc6b1c52b75c6bf60e3136))
+* **compiler-core:** optimize position cloning ([2073236](https://github.com/vuejs/core/commit/20732366b9b3530d33b842cf1fc985919afb9317))
+* **codegen:** optimize line / column calculation during codegen ([3be53d9](https://github.com/vuejs/core/commit/3be53d9b974dae1a10eb795cade71ae765e17574))
+* **codegen:** optimize source map generation ([c11002f](https://github.com/vuejs/core/commit/c11002f16afd243a2b15b546816e73882eea9e4d))
+* **shared:** optimize makeMap ([ae6fba9](https://github.com/vuejs/core/commit/ae6fba94954bac6430902f77b0d1113a98a75b18))
+
+
+### 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:
+
+1. Explicitly set [jsxImportSource](https://www.typescriptlang.org/tsconfig#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.
+
+2. 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](https://vuejs.org/about/releases.html#semantic-versioning-edge-cases).
+
+#### Deprecated Features Removed
+
+- [Reactivity Transform](https://vuejs.org/guide/extras/reactivity-transform.html) 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 [Vue Macros plugin](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. Use the [`is` attribute with `vue:` prefix](https://vuejs.org/api/built-in-special-attributes.html#is) instead.
+
# [3.4.0-rc.3](https://github.com/vuejs/core/compare/v3.4.0-rc.2...v3.4.0-rc.3) (2023-12-27)
projects / thirdparty / vuejs / core.git / commitdiff
