- **compiler-sfc:** do not resolve assets from setup bindings ([f5827fd](https://github.com/vuejs/core/commit/f5827fdf781c97234e9f82095e5e0cdadd404338)), closes [#3270](https://github.com/vuejs/core/issues/3270) [#3275](https://github.com/vuejs/core/issues/3275)
- **compiler-sfc:** fix function scope variable declaration marking ([69b4727](https://github.com/vuejs/core/commit/69b4727204256795d37a29930be33ab4f864af38))
- **compiler-sfc:** support proper type arguments for defineEmit helper ([bb8cdca](https://github.com/vuejs/core/commit/bb8cdcad9f91f099c12ad78afacfc909e6269a7c)), closes [#2874](https://github.com/vuejs/core/issues/2874)
- **reactivity:** should not trigger when setting value to same proxy ([#2904](https://github.com/vuejs/core/issues/2904)) ([c61e767](https://github.com/vuejs/core/commit/c61e7674221cd51df87aafc92367273c8815af6c))
- **runtime-core:** avoid unmount teleport's children multiple times ([#3499](https://github.com/vuejs/core/issues/3499)) ([3736496](https://github.com/vuejs/core/commit/3736496006485e61614bef285ea89ea2a33134c4)), closes [#3497](https://github.com/vuejs/core/issues/3497)
- **runtime-core:** fix dev fragment root flag check ([9cf7525](https://github.com/vuejs/core/commit/9cf75258c866bbdb2023c066cc3579fb86f15f40))
- **types:** add a type-only differentiator to assist Mixin's type infer ([#3481](https://github.com/vuejs/core/issues/3481)) ([5db2b14](https://github.com/vuejs/core/commit/5db2b141dcf20af5c762f7e40580904c43298764)), closes [#3468](https://github.com/vuejs/core/issues/3468)
- **types/tsx:** make JSX.Element extend VNode ([#3171](https://github.com/vuejs/core/issues/3171)) ([4f26835](https://github.com/vuejs/core/commit/4f26835dac5c345e6ccb2e2c2844f3560daa1de3))
### Performance Improvements
- **compiler-sfc:** skip srcset transform if all candidates are external ([b39208c](https://github.com/vuejs/core/commit/b39208cf06a56b115016be18d5ee368a8f9dff74))
- **runtime-core:** optimize the performance of getTypeIndex ([#3206](https://github.com/vuejs/core/issues/3206)) ([2e50acf](https://github.com/vuejs/core/commit/2e50acfbb89c29a071765d7f3967d2ccaf14f375))
- **compiler:** properly bail stringfication for nested slot elements ([f74b16c](https://github.com/vuejs/core/commit/f74b16ccfe42abddf6abfa6105900ad9b8124a96))
- **compiler-core:** allow unicode to appear in identifiers ([#3443](https://github.com/vuejs/core/issues/3443)) ([ebedccc](https://github.com/vuejs/core/commit/ebedcccdc04d8cda40f7a3b69354acfdda265c74)), closes [#3440](https://github.com/vuejs/core/issues/3440)
- **compiler-core:** detect v-if branch root with comment as dev fragment ([#2785](https://github.com/vuejs/core/issues/2785)) ([4bf7ba1](https://github.com/vuejs/core/commit/4bf7ba19bf6b1a6c242090d512c91e1bf8c7c8cc)), closes [#2780](https://github.com/vuejs/core/issues/2780)
- **compiler-core:** fix the detection of forwarded slots with v-if or v-for ([#3353](https://github.com/vuejs/core/issues/3353)) ([602b58e](https://github.com/vuejs/core/commit/602b58ebd1923dd48669755d5f5b67c5478cc625)), closes [#3347](https://github.com/vuejs/core/issues/3347)
- **compiler-core:** should not condense whitespace in RCDATA text mode ([#3482](https://github.com/vuejs/core/issues/3482)) ([b4b8215](https://github.com/vuejs/core/commit/b4b82159e2175d27f7d1f2641d262269f981fc86)), closes [#3479](https://github.com/vuejs/core/issues/3479)
- **compiler-dom:** stringifyStatic should remove attribute bindings with `null` value ([#3477](https://github.com/vuejs/core/issues/3477)) ([ca6aa01](https://github.com/vuejs/core/commit/ca6aa01181dd15e2ab76d89538cf898221f927cd)), closes [#3475](https://github.com/vuejs/core/issues/3475)
- **compiler-sfc:** scope Id should not be attached to [@keyframe](https://github.com/keyframe) breakpoint rules ([#3308](https://github.com/vuejs/core/issues/3308)) ([6cb9475](https://github.com/vuejs/core/commit/6cb94752b0354117669de94f81c5195ec8c7f40c)), closes [#3304](https://github.com/vuejs/core/issues/3304)
- **compiler-sfc:** should not rewrite scope variable ([#3449](https://github.com/vuejs/core/issues/3449)) ([bbc5fe6](https://github.com/vuejs/core/commit/bbc5fe6a9716efe87fdb4c4ac51fcdc3bd541904)), closes [#3445](https://github.com/vuejs/core/issues/3445)
- **compiler-ssr:** keep the order of imports expression for the fallback branch of SSR ([#3448](https://github.com/vuejs/core/issues/3448)) ([49f4072](https://github.com/vuejs/core/commit/49f4072c83c06a66e2b7a334d8dedabd1b433ca9)), closes [#3447](https://github.com/vuejs/core/issues/3447)
- **component:** prioritize registered component over implicit self-reference via filename ([abd129d](https://github.com/vuejs/core/commit/abd129d845951737c335a80a8af6cf7b0df2f74d)), closes [#2827](https://github.com/vuejs/core/issues/2827)
- **hydration:** handle camel-case tag name when performing match assertion ([#3247](https://github.com/vuejs/core/issues/3247)) ([9036f88](https://github.com/vuejs/core/commit/9036f88d8304a3455265f1ecd86ec8f4a5ea4715)), closes [#3243](https://github.com/vuejs/core/issues/3243)
- **KeepAlive:** adapt keepalive for ssr ([#3259](https://github.com/vuejs/core/issues/3259)) ([e8e9b00](https://github.com/vuejs/core/commit/e8e9b00f81ed42434afd92f84101e7a14d70a23c)), closes [#3255](https://github.com/vuejs/core/issues/3255)
- **reactivity:** ensure computed can be wrapped by readonly ([41e02f0](https://github.com/vuejs/core/commit/41e02f0fac069c93c94438741517e713f3c94215)), closes [#3376](https://github.com/vuejs/core/issues/3376)
- **reactivity:** ensure that shallow and normal proxies are tracked seperately (close [#2843](https://github.com/vuejs/core/issues/2843)) ([#2851](https://github.com/vuejs/core/issues/2851)) ([22cc4a7](https://github.com/vuejs/core/commit/22cc4a76592cfe336e75e2fa0c05232ae1f0f149))
- **rumtime-core:** custom dom props should be cloned when cloning a hoisted DOM ([#3080](https://github.com/vuejs/core/issues/3080)) ([5dbe834](https://github.com/vuejs/core/commit/5dbe8348581dacd7a3594a9b0055ce350ce8e5bf)), closes [#3072](https://github.com/vuejs/core/issues/3072)
- **runtime-core:** handle error in async setup ([#2881](https://github.com/vuejs/core/issues/2881)) ([d668d48](https://github.com/vuejs/core/commit/d668d48e9e5211a49ee53361ea5b4d67ba16e0a3))
- **runtime-core:** handle error in async watchEffect ([#3129](https://github.com/vuejs/core/issues/3129)) ([eb1fae6](https://github.com/vuejs/core/commit/eb1fae63f926435fb0eef890663d24e09d4c79e1))
- **runtime-core:** should call chained mixins and extends ([#3040](https://github.com/vuejs/core/issues/3040)) ([b58bb16](https://github.com/vuejs/core/commit/b58bb169590297daf9df0433b413fab118f18486)), closes [#3038](https://github.com/vuejs/core/issues/3038)
- **runtime-core:** should not cache property access during data() invocation ([#3299](https://github.com/vuejs/core/issues/3299)) ([6e88156](https://github.com/vuejs/core/commit/6e88156934a88c891fa1014c46c04a3fa1a5eaeb)), closes [#3297](https://github.com/vuejs/core/issues/3297)
- **runtime-core:** should not track deps in pre flush watcher callbacks ([d5824b9](https://github.com/vuejs/core/commit/d5824b97c570eb9e3d689b840f098e401e458d05)), closes [#2728](https://github.com/vuejs/core/issues/2728)
- **runtime-core:** the select tag's multiple prop should be set before the children mounting ([#3202](https://github.com/vuejs/core/issues/3202)) ([2451dd8](https://github.com/vuejs/core/commit/2451dd8ae63cc0667a234f9896b1a4f241d4cb44)), closes [#3199](https://github.com/vuejs/core/issues/3199)
- **runtime-dom:** support mounting app to svg container ([#2929](https://github.com/vuejs/core/issues/2929)) ([8ffcde2](https://github.com/vuejs/core/commit/8ffcde2836baa41d279d9cc079f139a2e31cf6be)), closes [#2926](https://github.com/vuejs/core/issues/2926)
- **ssr:** ensure async setup error handling work with suspense during ssr ([2e71f07](https://github.com/vuejs/core/commit/2e71f07bc1bab09ca6970b8992d05aeea9b5e9e4))
- **ssr:** properly update currentRenderingInstance state during ssr ([8c3c14a](https://github.com/vuejs/core/commit/8c3c14a0ff02bffbc37e1b069d4ff3c7e086a1d5)), closes [#2863](https://github.com/vuejs/core/issues/2863)
- **ssr:** respect render function from extends/mixins in ssr ([#3006](https://github.com/vuejs/core/issues/3006)) ([0a583d5](https://github.com/vuejs/core/commit/0a583d5ca224d2cba878dc6b0fb8d468e658f1ef)), closes [#3004](https://github.com/vuejs/core/issues/3004)
- **teleport:** targetAnchor should also be removed when unmounted ([#2870](https://github.com/vuejs/core/issues/2870)) ([21d1288](https://github.com/vuejs/core/commit/21d128813353fd5d5a5304f8fb885265f5163cd8))
- **Teleport:** component with multi roots should be removed when unmounted ([#3157](https://github.com/vuejs/core/issues/3157)) ([7769513](https://github.com/vuejs/core/commit/776951315d38fb93b75892bd60a69177b4480f67)), closes [#3156](https://github.com/vuejs/core/issues/3156)
- **Teleport:** fallback to non-optimized mode when HRM performing updates ([#3311](https://github.com/vuejs/core/issues/3311)) ([9cb21d0](https://github.com/vuejs/core/commit/9cb21d088edd097b75a038f2c11d1c921406686f)), closes [#3302](https://github.com/vuejs/core/issues/3302)
- **transition:** toggling branches with in-out mode should be transitioned correctly ([#3109](https://github.com/vuejs/core/issues/3109)) ([67a0290](https://github.com/vuejs/core/commit/67a0290c0aa5626dbc71b66b00e7ca7755e339cb)), closes [#3104](https://github.com/vuejs/core/issues/3104)
- **types:** allow style to be an array in JSX ([#2947](https://github.com/vuejs/core/issues/2947)) ([13c9d2c](https://github.com/vuejs/core/commit/13c9d2ca82d60652ef19fe055ecbe0d05134007b))
- **types:** union function prop ([#3119](https://github.com/vuejs/core/issues/3119)) ([3755e60](https://github.com/vuejs/core/commit/3755e60c52adcd83e569f32c3d31d8854b4fdd8d)), closes [#3357](https://github.com/vuejs/core/issues/3357)
- **types:** unwrap refs on public instance data ([#3319](https://github.com/vuejs/core/issues/3319)) ([2b588cf](https://github.com/vuejs/core/commit/2b588cf1bc03329576b8759c9072e3e551b739f1)), closes [#3315](https://github.com/vuejs/core/issues/3315)
- **types/jsx:** llow tabindex to be a string ([#3476](https://github.com/vuejs/core/issues/3476)) ([e4a5712](https://github.com/vuejs/core/commit/e4a5712a33d10d3087f1c3cff0ecdf5569a84d94))
- add display name for suspense component ([#3312](https://github.com/vuejs/core/issues/3312)) ([3b3a9a1](https://github.com/vuejs/core/commit/3b3a9a1f5225fb734d16ffe2d596f457e9c47cec))
### Performance Improvements
- support only attaching slot scope ids when necessary ([02cbbb7](https://github.com/vuejs/core/commit/02cbbb718ca226b087c42e6f132120931307c2a6))
- **compiler-sfc:** handle more edge cases in default rewrite ([1dedc19](https://github.com/vuejs/core/commit/1dedc19e1f0a2039d2ab8f55af6e27034b8dcde5))
- **deps:** pin Rollup to 2.38 ([34f354b](https://github.com/vuejs/core/commit/34f354b2a0eeb6c148ca485ae3558842814ea4d2)), closes [#3332](https://github.com/vuejs/core/issues/3332)
- **runtime-core:** properties in methods should be writable and enumerable in DEV ([#3301](https://github.com/vuejs/core/issues/3301)) ([e3568ba](https://github.com/vuejs/core/commit/e3568bae276889cee60f4e84321a287125014e86)), closes [#3300](https://github.com/vuejs/core/issues/3300)
- **scheduler:** ensure updates are always inserted in ascending id order ([#3184](https://github.com/vuejs/core/issues/3184)) ([45fae9d](https://github.com/vuejs/core/commit/45fae9d308e8cb9fe3304d4ca03c373ce63b2e62)), closes [#2768](https://github.com/vuejs/core/issues/2768) [#2829](https://github.com/vuejs/core/issues/2829)
- init devtools after feature flag checks ([d0ea745](https://github.com/vuejs/core/commit/d0ea74556f74d8c503ffb7b70f41cbe2ce14db98))
### Performance Improvements
- **reactivity:** only call Set.add if doesn't already have value ([#3307](https://github.com/vuejs/core/issues/3307)) ([9cd9883](https://github.com/vuejs/core/commit/9cd988342cfa32ddd9479585244eb317d74c9712))
- **compiler-core:** do not mark v-for as stable on const bindings ([734c65b](https://github.com/vuejs/core/commit/734c65badd8395a78d7beee1fc960aee418361a0)), closes [vitejs/vite#1956](https://github.com/vitejs/vite/issues/1956)
- **compiler-dom:** ensure global build filename matches the one defined in package.json (close [#3181](https://github.com/vuejs/core/issues/3181)) ([#3185](https://github.com/vuejs/core/issues/3185)) ([96b6433](https://github.com/vuejs/core/commit/96b64335242a99432080aeb879e5c0787207a0de))
- **compiler-sfc:** the empty lang attribute should be treated as no lang specified ([#3051](https://github.com/vuejs/core/issues/3051)) ([6d5b623](https://github.com/vuejs/core/commit/6d5b62351248780663d2612a1f483f7ea9f5e5a2))
- **compiler-sfc:** transformAssetUrls.base should not affect known module requests ([2ea9867](https://github.com/vuejs/core/commit/2ea9867398d19148b32643fa0e6523c95b9ca956))
- **compiler-sfc:** treat const reactive() bindings as mutable ([03360ce](https://github.com/vuejs/core/commit/03360cefa1b7038174fa3c1fc3a04400b4cdbbce))
- **devtools:** init devtools in production ([#2906](https://github.com/vuejs/core/issues/2906)) ([4d9bcb7](https://github.com/vuejs/core/commit/4d9bcb768ddc294430aedcf27155aaca292c47bd))
- **devtools:** send instance to devtools when it's mounted instead of created ([4fecb27](https://github.com/vuejs/core/commit/4fecb27f8696fdb8f681948543ea81ea62fe43bf))
- **docs:** change reference to passed deadline ([#2930](https://github.com/vuejs/core/issues/2930)) ([de7f9d1](https://github.com/vuejs/core/commit/de7f9d1efd7fa19a908357d3f3a706c52694d8bd))
- **hmr:** deep clone reused hoisted trees during dev ([5a7a1b8](https://github.com/vuejs/core/commit/5a7a1b8293822219283d6e267496bec02234b0bc)), closes [vitejs/vite#2022](https://github.com/vitejs/vite/issues/2022)
- **runtime-core:** align $parent/$root with the template ref when using expose ([#3158](https://github.com/vuejs/core/issues/3158)) ([f43a3b0](https://github.com/vuejs/core/commit/f43a3b0bebf0837223e7b8f046dad63e34cd323b))
- **runtime-core:** allow overriding properties other than props ([#3105](https://github.com/vuejs/core/issues/3105)) ([73117f6](https://github.com/vuejs/core/commit/73117f6b5b1e36c9400248ed9e815839c49a12c8))
- **runtime-core:** check the DEV_ROOT_FRAGMENT flag correctly in the dev environment ([#2750](https://github.com/vuejs/core/issues/2750)) ([347a879](https://github.com/vuejs/core/commit/347a8798a4c5f0b426f3ac84a01d752d823fb51b))
- **runtime-core:** component methods should override global properties in DEV ([#3074](https://github.com/vuejs/core/issues/3074)) ([2587f36](https://github.com/vuejs/core/commit/2587f36fe311359e2e34f40e8e47d2eebfab7f42))
- **runtime-core:** ensure app instance can be garbage collected after unmount (close [#2907](https://github.com/vuejs/core/issues/2907)) ([#2909](https://github.com/vuejs/core/issues/2909)) ([60e05ef](https://github.com/vuejs/core/commit/60e05eff232c3ddfca1c20e52f72aa36165d8a22))
- **runtime-core:** instanceWatch should pass `this.proxy` to source as the first argument ([#2753](https://github.com/vuejs/core/issues/2753)) ([ec8fd10](https://github.com/vuejs/core/commit/ec8fd10cec61c33c7c8056413a1c609ac90e1215))
- **runtime-dom:** ensure readonly type prop on textarea is handled patched as attribute ([#2888](https://github.com/vuejs/core/issues/2888)) ([c5d147c](https://github.com/vuejs/core/commit/c5d147c57f75ca38cc334bb27b61a8bc153494bd)), closes [#2766](https://github.com/vuejs/core/issues/2766)
- kebab-case events are attached correctly on web components, see [#2841](https://github.com/vuejs/core/issues/2841) ([#2847](https://github.com/vuejs/core/issues/2847)) ([b302cbb](https://github.com/vuejs/core/commit/b302cbbbd3fd512f2b8afbd9c873060a40bf8e62))
- **types:** extract the correct props type for the DateConstructor ([#2676](https://github.com/vuejs/core/issues/2676)) ([48f0d29](https://github.com/vuejs/core/commit/48f0d2944f0f9d2f556e62782fc61985897b2ed4))
- ensure all published packages contan a LICENCE file (close [#2650](https://github.com/vuejs/core/issues/2650)) ([#2857](https://github.com/vuejs/core/issues/2857)) ([6a48d23](https://github.com/vuejs/core/commit/6a48d23749e418b44ba17cd3e85f478484fd7ffe))
- remove superfluous spaces when normalizing class ([#3083](https://github.com/vuejs/core/issues/3083)) ([4b55142](https://github.com/vuejs/core/commit/4b551420fc058c4683219db5d75893f9fc69aa04))
- **runtime-dom:** enable set form attr to null on form-elements ([#2840](https://github.com/vuejs/core/issues/2840)) ([#2849](https://github.com/vuejs/core/issues/2849)) ([f262438](https://github.com/vuejs/core/commit/f2624380731cc32e71523e8c2c98037e98e09319))
- **toRef:** ref created from union typed prop can't be used in watch ([#3048](https://github.com/vuejs/core/issues/3048)) ([4ca4666](https://github.com/vuejs/core/commit/4ca4666d58ee8025570dc14f1c163bdeac9c6012))
- should prefix `ShadowRoot` with `window.` ([#2943](https://github.com/vuejs/core/issues/2943)) ([97d6f1a](https://github.com/vuejs/core/commit/97d6f1a716045123d0e05600e64f11f92f504747))
### Features
- remove useless option in KeepAlive ([#3170](https://github.com/vuejs/core/issues/3170)) ([bd1240c](https://github.com/vuejs/core/commit/bd1240c1270b610c4ffcf6c32e2bbe2c9265020f))
- **compiler-core:** support `BigInt` in template ([#2900](https://github.com/vuejs/core/issues/2900)) ([c9f94fa](https://github.com/vuejs/core/commit/c9f94fa3cfbe8fcd9ea3d49d523dfb282c468369))
- **compiler-sfc:** upgrade to postcss 8 ([#2710](https://github.com/vuejs/core/issues/2710)) ([49bc2e4](https://github.com/vuejs/core/commit/49bc2e4db568d4f9fa2ccfe4e22c792cfc02651a))
- **runtime-core:** props type support `BigInt` ([#2891](https://github.com/vuejs/core/issues/2891)) ([ffd5288](https://github.com/vuejs/core/commit/ffd52885453d1621e45dff645ff1101e74ea40b2))
### Performance Improvements
- **reactivity:** should not track `__isVue` ([#2940](https://github.com/vuejs/core/issues/2940)) ([dd02cf3](https://github.com/vuejs/core/commit/dd02cf37d5f5a6946bcae01ee70568e38a82c177))
- **compiler-sfc:** should keep template nodes with no content ([#2468](https://github.com/vuejs/core/issues/2468)) ([5b9b37f](https://github.com/vuejs/core/commit/5b9b37fc9b363be2989c1e9d76ab6e950cdfe2ad)), closes [#2463](https://github.com/vuejs/core/issues/2463)
- **compiler-sfc:** support transforming asset urls with full base url. ([#2477](https://github.com/vuejs/core/issues/2477)) ([db786b1](https://github.com/vuejs/core/commit/db786b1afe41c26611a215e6d6599d50312b9c2f))
- **compiler-core:** transform kebab case props to camelcase on slots ([#2490](https://github.com/vuejs/core/issues/2490)) ([ef59a30](https://github.com/vuejs/core/commit/ef59a30cabd12f6f14fee210a7fe49bccd3fd86c)), closes [#2488](https://github.com/vuejs/core/issues/2488)
- **compiler-sfc:** fix parsing error when `lang=""` is used on plain element ([#2569](https://github.com/vuejs/core/issues/2569)) ([5f2a853](https://github.com/vuejs/core/commit/5f2a8533acc332528faedb2d1b6ecdae104087a4)), closes [#2566](https://github.com/vuejs/core/issues/2566)
- **compiler-sfc:** named imports from .vue file should not be treated as constant ([085bbd5](https://github.com/vuejs/core/commit/085bbd5fe07c52056e9f7151fbaed8f6a2e442b3)), closes [#2699](https://github.com/vuejs/core/issues/2699)
- **compiler-sfc:** should not remove import statements with no specifier when compiling script setup ([43eab92](https://github.com/vuejs/core/commit/43eab923ea651079181490d191966ff28988e9c8))
- **compiler-ssr:** generate correct children for transition-group ([a5d6f80](https://github.com/vuejs/core/commit/a5d6f8091e3761447b7fec0e3d1346eb83402a0a)), closes [#2510](https://github.com/vuejs/core/issues/2510)
- **compiler-ssr:** handle v-model checkbox with true-value binding ([fe5428d](https://github.com/vuejs/core/commit/fe5428db1207747886957b831d46d71ecb6fadaa))
- **compiler-ssr:** should not render key/ref bindings in ssr ([5b62662](https://github.com/vuejs/core/commit/5b6266284da01008e2f68ed353a622adc5704261))
- **provide:** support symbols in applyOptions ([#2616](https://github.com/vuejs/core/issues/2616)) ([7a1a782](https://github.com/vuejs/core/commit/7a1a782642a13d5fcc6b8c738a5ce8f8c657e1b5)), closes [#2615](https://github.com/vuejs/core/issues/2615)
- **runtime-core:** handle static node move in production ([bf16a57](https://github.com/vuejs/core/commit/bf16a57fc3d23118c670918348f02457cfcc44d6))
- **runtime-core:** remove static node in production mode ([#2556](https://github.com/vuejs/core/issues/2556)) ([2a9ba0c](https://github.com/vuejs/core/commit/2a9ba0c8e961ed6c68a8008ccbef85ff2cabeeb2)), closes [#2553](https://github.com/vuejs/core/issues/2553)
- **runtime-core:** should pause tracking when initializing legacy options ([#2524](https://github.com/vuejs/core/issues/2524)) ([0ff2a4f](https://github.com/vuejs/core/commit/0ff2a4f1c1847a4e173dcab810e6438143a4272c)), closes [#2521](https://github.com/vuejs/core/issues/2521)
- **runtime-core:** skip functional components in public $parent chain traversal ([53f4885](https://github.com/vuejs/core/commit/53f4885d9e06f1b1b0b33abc8f1c20766cbb2d1a)), closes [#2437](https://github.com/vuejs/core/issues/2437)
- **runtime-dom:** attribute should be removed with nullish values ([#2679](https://github.com/vuejs/core/issues/2679)) ([fb6b9f8](https://github.com/vuejs/core/commit/fb6b9f8e8ff35ca4d8723a9f96e36266de0dd947)), closes [#2677](https://github.com/vuejs/core/issues/2677)
- **slots:** dynamically named slots should be keyed by name ([2ab8c41](https://github.com/vuejs/core/commit/2ab8c41a1a43952fb229587a9da48d9a1214ab9e)), closes [#2535](https://github.com/vuejs/core/issues/2535)
- **slots:** should render fallback content when slot content contains no valid nodes ([#2485](https://github.com/vuejs/core/issues/2485)) ([ce4915d](https://github.com/vuejs/core/commit/ce4915d8bed12f4cdb5fa8ca39bda98d0d3aabb7)), closes [#2347](https://github.com/vuejs/core/issues/2347) [#2461](https://github.com/vuejs/core/issues/2461)
- **teleport:** Teleport into SVG elements ([#2648](https://github.com/vuejs/core/issues/2648)) ([cd92836](https://github.com/vuejs/core/commit/cd928362232747a51d1fd4790bb20adcdd59d187)), closes [#2652](https://github.com/vuejs/core/issues/2652)
- **transition:** avoid invoking stale transition end callbacks ([eaf8a67](https://github.com/vuejs/core/commit/eaf8a67c7219e1b79d6abca44a1d7f1b341b58b0)), closes [#2482](https://github.com/vuejs/core/issues/2482)
- **transition:** respect rules in \*-leave-from transition class ([#2597](https://github.com/vuejs/core/issues/2597)) ([e2618a6](https://github.com/vuejs/core/commit/e2618a632d4add2819ffb8b575af0da189dc3204)), closes [#2593](https://github.com/vuejs/core/issues/2593)
- **types:** fix ToRefs type on union value types ([e315d84](https://github.com/vuejs/core/commit/e315d84936c82bee8f2cf2369c61b5aaec38f328)), closes [#2687](https://github.com/vuejs/core/issues/2687)
- **v-model:** avoid mutation when using Set models + fix multi select Set model update ([f2b0a8e](https://github.com/vuejs/core/commit/f2b0a8e81d15eb8017c7fca5c1dff0e5f6a5573e))
- allow hmr in all builds ([46d80f4](https://github.com/vuejs/core/commit/46d80f4d585195446e7f8cf4ba42d00a98e9ee5d)), closes [#2571](https://github.com/vuejs/core/issues/2571)
### Features
- **sfc:** allow sfcs to recursively self-reference in template via name inferred from filename ([67d1aac](https://github.com/vuejs/core/commit/67d1aac6ae683a3a7291dff15071d1eeacb7d22a))
- **hmr:** fix updates for imported but not yet rendered components ([9c23ddf](https://github.com/vuejs/core/commit/9c23ddf9c593dcf6d20bc911ec95d9b674f23dc8))
- **runtime-core:** components with static props and slots should not be force updated ([51e43e0](https://github.com/vuejs/core/commit/51e43e07998eeade153c42a9a9b3eda8fe885c88))
- **runtime-core:** ensure scheduler queue is always non-null ([#2567](https://github.com/vuejs/core/issues/2567)) ([af95604](https://github.com/vuejs/core/commit/af9560455d9719a4c5f0d6588d04bfb4c06c8654))
- **runtime-dom:** use correct import source ([f28ca55](https://github.com/vuejs/core/commit/f28ca556925147bb109d5ba77c5dafaf17d57322))
- **style-vars:** apply css vars in post flush effect ([3a6b120](https://github.com/vuejs/core/commit/3a6b1207fa39cb35eed5bae0b5fdcdb465926bca))
- handle case of ref declaration without initial value ([8485cd4](https://github.com/vuejs/core/commit/8485cd48437bf47880a61b03c57090e8bfdf527b))
- **types:** ensure correct type for toRef and toRefs on existing refs ([8e20375](https://github.com/vuejs/core/commit/8e2037537219219d5ab6456e8a29bd0235eac311))
### Experimental Features
> Note: support for experimental features in SFCs have been updated according to changes in ongoing RFCs. This release may break existing usage of such experimental features.
- **compiler-sfc:** compileScript inline render function mode ([886ed76](https://github.com/vuejs/core/commit/886ed7681dd203c07ff3b504538328f43e14d9b0))
- **compiler-sfc:** new script setup implementation ([556560f](https://github.com/vuejs/core/commit/556560fae31d9e406cfae656089657b6332686c1))
- **compiler-sfc:** new SFC css varaible injection implementation ([41bb7fa](https://github.com/vuejs/core/commit/41bb7fa330e78c4a354a2e67742bd13bee2f4293))
- **compiler-sfc:** support kebab-case components in `<script setup>` sfc template ([3f99e23](https://github.com/vuejs/core/commit/3f99e239e03a8861c462d4ee91feb82066ab3e28))
- **runtime-core:** explicit expose API ([0e59770](https://github.com/vuejs/core/commit/0e59770b9282992f6a5af4d8fef33dafb948fc8b))
### Reverts
- Revert "wip: allow scriptCompiled to be cached on sfc descriptor" ([9db4288](https://github.com/vuejs/core/commit/9db42889e65a0e80cdbae5c19d76dab4f9fadb6d))
- **reactivity:** track length on for in iteration on Array ([0e5a3c4](https://github.com/vuejs/core/commit/0e5a3c47a7398dfd0107fccf9b615772dd01aa74)), closes [#2427](https://github.com/vuejs/core/issues/2427)
- **runtime-core:** avoid mutating EMPTY_ARR when setting dev root ([#2419](https://github.com/vuejs/core/issues/2419)) ([edd49dc](https://github.com/vuejs/core/commit/edd49dcab40eb3faa44248772b176d5eebfd30fe)), closes [#2413](https://github.com/vuejs/core/issues/2413)
- **runtime-core:** non-stable Fragment should always unmount its children ([#2445](https://github.com/vuejs/core/issues/2445)) ([fff62e2](https://github.com/vuejs/core/commit/fff62e2ee8accf31bb5ac5abdb4c0636216cfd0e)), closes [#2444](https://github.com/vuejs/core/issues/2444)
- **types:** h support for resolveComponent ([#2402](https://github.com/vuejs/core/issues/2402)) ([1f2a652](https://github.com/vuejs/core/commit/1f2a652a9d2e3bec472fb1786a4c16d6ccfa1fb1)), closes [#2357](https://github.com/vuejs/core/issues/2357)
- **v-model:** built in modifiers support on component ([#2348](https://github.com/vuejs/core/issues/2348)) ([128ec46](https://github.com/vuejs/core/commit/128ec460ec00ca8672352d019b264c80dfd0c3b0)), closes [#2326](https://github.com/vuejs/core/issues/2326)
### Features
- **compile-core:** handle falsy dynamic args for v-on and v-bind ([#2393](https://github.com/vuejs/core/issues/2393)) ([052a621](https://github.com/vuejs/core/commit/052a621762c5f7c420464747ebbbed27c7350593)), closes [#2388](https://github.com/vuejs/core/issues/2388)
- **compiler-core:** consistently remove comment nodes for pre tags in production ([f411924](https://github.com/vuejs/core/commit/f4119249f2d3f394469028ad9664f61830540ff9)), closes [#2217](https://github.com/vuejs/core/issues/2217)
- **compiler-core:** make v-once work with v-if/else-if/else ([#2182](https://github.com/vuejs/core/issues/2182)) ([9499871](https://github.com/vuejs/core/commit/94998715822589f6f10443b6dba75f193467845d)), closes [#2035](https://github.com/vuejs/core/issues/2035)
- **compiler-ssr:** fix SSR issue when dynamic and static class co-exist ([#2354](https://github.com/vuejs/core/issues/2354)) ([8539c0b](https://github.com/vuejs/core/commit/8539c0bf32e86fb16349a210f878681579fb7976))
- **hmr:** full diff props for non-sfc component ([#2359](https://github.com/vuejs/core/issues/2359)) ([e78915a](https://github.com/vuejs/core/commit/e78915a74045ebcf34e8e99064fff48cd044632c))
- **reactivity:** should add allowRecurse to the effect ([#2213](https://github.com/vuejs/core/issues/2213)) ([ea1f87e](https://github.com/vuejs/core/commit/ea1f87eabf2deab2e586af7ebd2d74bb58f72b87)), closes [#2200](https://github.com/vuejs/core/issues/2200)
- **reactivity:** should not trigger watch on computed ref when value is unchanged ([390589e](https://github.com/vuejs/core/commit/390589ec6d977675c5cef2807fbf3e930a25eef0)), closes [#2231](https://github.com/vuejs/core/issues/2231)
- **reactivity:** use resetTracking instead of enableTracking ([#2174](https://github.com/vuejs/core/issues/2174)) ([7cc09ca](https://github.com/vuejs/core/commit/7cc09ca8a581783c2391824885206348e5e99934))
- **runtime-core:** ensure this context for $nextTick callback ([5c3e8e9](https://github.com/vuejs/core/commit/5c3e8e984029711c97ca671fa098cf66483dd571)), closes [#2282](https://github.com/vuejs/core/issues/2282)
- **runtime-core:** error handling for created/beforeCreate hooks ([b392fe4](https://github.com/vuejs/core/commit/b392fe419c7486de62fac8f25640fe0836bef02e)), closes [#2268](https://github.com/vuejs/core/issues/2268)
- **runtime-core:** fix provide function data access in extends/mixins ([f06518a](https://github.com/vuejs/core/commit/f06518a8c9201b4fa2a956595aa9d89a192fcd20)), closes [#2300](https://github.com/vuejs/core/issues/2300)
- **runtime-core:** fix SSR memoery leak due to props normalization cache ([a66e53a](https://github.com/vuejs/core/commit/a66e53a24f445b688eef6812ecb872dc53cf2702)), closes [#2225](https://github.com/vuejs/core/issues/2225)
- **runtime-core:** make errorCaptured return value handling consistent with Vue 2 ([#2289](https://github.com/vuejs/core/issues/2289)) ([4d20ac8](https://github.com/vuejs/core/commit/4d20ac8173f84c87288255dcc03c62a6ee862a23)), closes [#2267](https://github.com/vuejs/core/issues/2267)
- **runtime-core:** use consistent camelCase event casing for render functions ([#2278](https://github.com/vuejs/core/issues/2278)) ([62f2617](https://github.com/vuejs/core/commit/62f26173ba715fd8bf2b131e19d94275106e830d)), closes [#2249](https://github.com/vuejs/core/issues/2249)
- **runtime-core:** vnode.el is null in watcher after rerendering ([#2295](https://github.com/vuejs/core/issues/2295)) ([28d5fd7](https://github.com/vuejs/core/commit/28d5fd7a2871c10df3427dfbbe0e203c2a976cb4)), closes [#2170](https://github.com/vuejs/core/issues/2170)
- **runtime-core/template-refs:** do not reset refs object before updates ([25d53f0](https://github.com/vuejs/core/commit/25d53f09bbf55412a003eabb7a390dc8434f8987)), closes [#2283](https://github.com/vuejs/core/issues/2283)
- **runtime-dom:** v-model should support number modifier with select tag ([#2308](https://github.com/vuejs/core/issues/2308)) ([d744b8a](https://github.com/vuejs/core/commit/d744b8a2dc7653c3e5e43e5379dbf72cf4c9ff2c)), closes [#2252](https://github.com/vuejs/core/issues/2252)
- **sfc/style-vars:** should attach css vars while `subtree` changed ([#2178](https://github.com/vuejs/core/issues/2178)) ([408a8ca](https://github.com/vuejs/core/commit/408a8cad48f5fe0854c83a979ff98f03738fbfba)), closes [#2177](https://github.com/vuejs/core/issues/2177)
- **teleport:** proper children traversal when teleport is block root ([2ae3b26](https://github.com/vuejs/core/commit/2ae3b26679faf2d5393998ba806b99748679195a)), closes [#2324](https://github.com/vuejs/core/issues/2324)
- **teleport:** should only force remove teleport when not disabled ([b0931dc](https://github.com/vuejs/core/commit/b0931dcabaa2858ba76102f49878771ec14fb2e8)), closes [#2323](https://github.com/vuejs/core/issues/2323)
- **types:** avoid DefineComponent defaulting to any ([6aa2256](https://github.com/vuejs/core/commit/6aa2256913bfd097500aba83b78482b87107c101)), closes [#2192](https://github.com/vuejs/core/issues/2192)
- **types:** fix using tuple type as EmitsOptions ([#2160](https://github.com/vuejs/core/issues/2160)) ([5dbd6b3](https://github.com/vuejs/core/commit/5dbd6b36a0666fc6c993115ee5281ef253ba8a68)), closes [#2159](https://github.com/vuejs/core/issues/2159)
- **v-for:** handle and warn when `v-for` receives non-integer range number ([#2247](https://github.com/vuejs/core/issues/2247)) ([02f355e](https://github.com/vuejs/core/commit/02f355eb69df32a03e942e01ac1de654d26916a1)), closes [#2245](https://github.com/vuejs/core/issues/2245)
- **v-model:** avoid clearing IME compose state on updates ([#2304](https://github.com/vuejs/core/issues/2304)) ([fbd198f](https://github.com/vuejs/core/commit/fbd198fbfe2f87c3c15a63d9770d00bf3fc9c142)), closes [#2302](https://github.com/vuejs/core/issues/2302)
- **v-model:** ensure initial value is set after other attributes ([54ed759](https://github.com/vuejs/core/commit/54ed7592e416fc411196e9b767aebcc4f2ca20d8)), closes [#2325](https://github.com/vuejs/core/issues/2325)
- **runtime-dom/vModel:** remove looseHas if model is Set ([#2236](https://github.com/vuejs/core/issues/2236)) ([6a554fe](https://github.com/vuejs/core/commit/6a554feb13487132ed7631f80a1efe8c41991346))
- do not enable hmr in non-browser envs ([cf2c9f6](https://github.com/vuejs/core/commit/cf2c9f6faa95add4c23b20c4b8a6e477d05ff0ed))
- **hmr:** make hmr working with class components ([#2144](https://github.com/vuejs/core/issues/2144)) ([422f05e](https://github.com/vuejs/core/commit/422f05e085036e23ea3632c2ce75d86181a087b8))
- **suspense:** should discard unmount effects of invalidated pending branch ([5bfcad1](https://github.com/vuejs/core/commit/5bfcad155b444b2f7ffaac171c1f61bc23909287))
- **types:** component instance inference without props ([#2145](https://github.com/vuejs/core/issues/2145)) ([57bdaa2](https://github.com/vuejs/core/commit/57bdaa2220afefbde21118659c1ce2377d6b86d6))
### Code Refactoring
- watch APIs default to trigger pre-flush ([49bb447](https://github.com/vuejs/core/commit/49bb44756fda0a7019c69f2fa6b880d9e41125aa)), closes [/github.com/vuejs/core/issues/1706#issuecomment-666258948](https://github.com//github.com/vuejs/core/issues/1706/issues/issuecomment-666258948)
### Features
- **runtime-core:** support using inject() inside props default functions ([58c31e3](https://github.com/vuejs/core/commit/58c31e36992d2647e5247de4904246fb2d6112ed))
- **watch:** support dot-delimited path in watch option ([1c9a0b3](https://github.com/vuejs/core/commit/1c9a0b3e195d144ac90d22d2cc2cef6a3fd8276d))
### BREAKING CHANGES
- watch APIs now default to use `flush: 'pre'` instead of
`flush: 'post'`. This change affects `watch`, `watchEffect`, the `watch` component option, and `this.$watch`. See ([49bb447](https://github.com/vuejs/core/commit/49bb44756fda0a7019c69f2fa6b880d9e41125aa)) for more details.
- **reactivity:** effect should only recursively self trigger with explicit options ([3810de7](https://github.com/vuejs/core/commit/3810de7d6bd0044177f043285228c2e988093883)), closes [#2125](https://github.com/vuejs/core/issues/2125)
- **runtime-core:** ensure root stable fragments inherit elements for moving ([bebd44f](https://github.com/vuejs/core/commit/bebd44f793ccd13bfdf90c7e45eac320a340650c)), closes [#2134](https://github.com/vuejs/core/issues/2134)
- **runtime-core:** should still do full traverse of stable fragment children in dev + hmr ([dd40ad8](https://github.com/vuejs/core/commit/dd40ad8fca47af0e1f0a963be2f48c23f7457952))
- **runtime-core/async-component:** fix error component when there are no error handlers ([c7b4a37](https://github.com/vuejs/core/commit/c7b4a379cf8627c79a01d61039d3e3b283477dc1)), closes [#2129](https://github.com/vuejs/core/issues/2129)
- **types/tsx:** optional props from Mixin/Extends are treated as required ([#2048](https://github.com/vuejs/core/issues/2048)) ([89e9ab8](https://github.com/vuejs/core/commit/89e9ab8a2a387f26a370848db0b1ffb1d0ab9549))
### Features
- **compiler-sfc:** `additionalData` support for css preprocessors ([#2126](https://github.com/vuejs/core/issues/2126)) ([066d514](https://github.com/vuejs/core/commit/066d514d757fb7e8844104210d7d04cc11598fef))
- **compiler-core:** fix v-if block handling for components that fail to resolve ([a096a58](https://github.com/vuejs/core/commit/a096a58e412dc37ae618a3b4702f591c580d376a)), closes [#2058](https://github.com/vuejs/core/issues/2058)
- **compiler-sfc:** should extract comment for import or type declarations ([#2107](https://github.com/vuejs/core/issues/2107)) ([05df696](https://github.com/vuejs/core/commit/05df696a2b846a249f2569f4d6183c16e4be88e7)), closes [#2102](https://github.com/vuejs/core/issues/2102)
- **compiler-ssr:** correct the variable name generated by the generator ([#2065](https://github.com/vuejs/core/issues/2065)) ([aa8dc9a](https://github.com/vuejs/core/commit/aa8dc9a50706e6407978da3c43d7e4d2eb292d56))
- **compiler-ssr/teleport:** correct the target prop of teleport ([#2053](https://github.com/vuejs/core/issues/2053)) ([7455dca](https://github.com/vuejs/core/commit/7455dca11cea22f26a7c72628f6b61ad02856bfc))
- **inject:** fix support for inject option default function ([d472461](https://github.com/vuejs/core/commit/d4724619fc3d005311f27c1ac7cab0a0e735c4d2)), closes [#2050](https://github.com/vuejs/core/issues/2050)
- **keep-alive:** should use onMounted and onUpdated to invoke cacheSubtree ([#1984](https://github.com/vuejs/core/issues/1984)) ([890ca8a](https://github.com/vuejs/core/commit/890ca8aa346e77002e0ffbc497018bdc5a6f8125))
- **KeepAlive:** when exclude prop change, it should prune cache that not matched ([#2111](https://github.com/vuejs/core/issues/2111)) ([98cc1f9](https://github.com/vuejs/core/commit/98cc1f9d848edf9a58315018d57885f983bb5baa))
- **reactivity:** `toRef` should not wrap a `ref` ([#2103](https://github.com/vuejs/core/issues/2103)) ([d4bf9bc](https://github.com/vuejs/core/commit/d4bf9bcbb430fa0168ca48039579d59e6789c6f5))
- should be able to parse decorators in script lang="ts" & jsx ([#2088](https://github.com/vuejs/core/issues/2088)) ([273d19a](https://github.com/vuejs/core/commit/273d19ad461a46d5b8753be2d2886249947494a6))
- **reactivity:** add NaN prop on Array should not trigger length dependency. ([#1998](https://github.com/vuejs/core/issues/1998)) ([0d4910a](https://github.com/vuejs/core/commit/0d4910a211f6debd8ea5ca414d6308f1028679a3))
- **compiler-sfc:** support `additionalData` option in `compileStyle` when processing sass ([#1952](https://github.com/vuejs/core/issues/1952)) ([9377352](https://github.com/vuejs/core/commit/937735251ce2539ce9a087359eb270ce5b260ffe))
- **runtime-dom:** allow native Set as v-model checkbox source ([#1957](https://github.com/vuejs/core/issues/1957)) ([cf1b6c6](https://github.com/vuejs/core/commit/cf1b6c666f45a284494f80981522a3dc4804a683))
### Performance Improvements
- should not trigger child update if changed prop is declared emit listener ([124c385](https://github.com/vuejs/core/commit/124c385bafb40f8df7ec61b612765706015ff0fa)), closes [#2072](https://github.com/vuejs/core/issues/2072)
- **devtools:** make el extra properties non-enumerable ([7fd3436](https://github.com/vuejs/core/commit/7fd3436290f3777f77cf4a05268e51353c91b297))
- **runtime-core:** enable block tracking when normalizing plain element with slot children ([#1987](https://github.com/vuejs/core/issues/1987)) ([5b82c48](https://github.com/vuejs/core/commit/5b82c48c7b9ac9debaed3a14792d5d84752f1ca6)), closes [#1980](https://github.com/vuejs/core/issues/1980)
- **runtime-core:** fix props/emits resolving with global mixins ([8ed0b34](https://github.com/vuejs/core/commit/8ed0b342d49d6a5cf353d17c8426ae9f3c312405)), closes [#1975](https://github.com/vuejs/core/issues/1975)
- **runtime-core:** openBlock() should not be tracked when block tracking is disabled ([ad93fa4](https://github.com/vuejs/core/commit/ad93fa42fc8c32d121c0121083d2f0bb40672737))
- **runtime-core:** v-model listeners that already exists on the component should not be merged ([#2011](https://github.com/vuejs/core/issues/2011)) ([63f1f18](https://github.com/vuejs/core/commit/63f1f18064f809ebfa2c76f9f645ac74b6d412f3)), closes [#1989](https://github.com/vuejs/core/issues/1989)
- **sfc/scoped-style:** inherit scopeId through nested HOCs with inheritAttrs: false ([c0427b4](https://github.com/vuejs/core/commit/c0427b45ffebb4cda24de16fa6365a65e185d2d7)), closes [#1988](https://github.com/vuejs/core/issues/1988)
- **types:** fix `this` type of `this.$watch` ([#2022](https://github.com/vuejs/core/issues/2022)) ([aa757e8](https://github.com/vuejs/core/commit/aa757e8e6d5f8f9ad60b1ec12c4ac9479be73c80))
- **v-once:** fix v-once usage with v-if and v-for ([52e45a9](https://github.com/vuejs/core/commit/52e45a9850b97daccfdb26830047d9529ceba667)), closes [#2035](https://github.com/vuejs/core/issues/2035)
- **reactivity:** no need to proxy has/ownKeys for readonly objects ([691a4b9](https://github.com/vuejs/core/commit/691a4b95305dd506c03725805d603c6824a66aff))
- **runtime-core:** class and style should be properly normalized in cloneVNode ([#1967](https://github.com/vuejs/core/issues/1967)) ([9153fc2](https://github.com/vuejs/core/commit/9153fc2d8a5c9d24d79161586c70840ae7b84b8b)), closes [#1964](https://github.com/vuejs/core/issues/1964)
- **runtime-core:** fix resolving assets from mixins and extends ([0cb7f7f](https://github.com/vuejs/core/commit/0cb7f7f880961162a6ca0b51bf308fbf83160eb5)), closes [#1963](https://github.com/vuejs/core/issues/1963)
- **reactivity:** add existing index or non-integer prop on Array should not trigger length dependency ([#1969](https://github.com/vuejs/core/issues/1969)) ([d5c4f6e](https://github.com/vuejs/core/commit/d5c4f6ed4d6feea9be56dcc0859592f03b6a5d9a))
- **devtools:** unmountApp not behind compile flag ([6eb7fd8](https://github.com/vuejs/core/commit/6eb7fd83333d97186d570029e4fdca060fdb328d))
- **hmr:** properly force hmr full component props update ([499bc0b](https://github.com/vuejs/core/commit/499bc0bfc4aedcb6ee4ec55ba823838b5496eba8)), closes [#1942](https://github.com/vuejs/core/issues/1942)
- **keep-alive:** should remove wrapped version of injected keep alive hooks ([#1959](https://github.com/vuejs/core/issues/1959)) ([1ea2400](https://github.com/vuejs/core/commit/1ea24000c8f062f3cdc773e8e254892a05ba0702))
- **runtime-core:** fix data merge order for mixins/extends ([c15311c](https://github.com/vuejs/core/commit/c15311cfe879aa98c06585d731d996fca7633421)), closes [#1953](https://github.com/vuejs/core/issues/1953)
- **ssr:** invoke directive created hook during hydration ([57642fa](https://github.com/vuejs/core/commit/57642fac8f33b9ea530cc997f8f7465a0573e123))
- **types:** relax ComponentPublicInstanceConstructor type for class components ([#1943](https://github.com/vuejs/core/issues/1943)) ([67b6e0f](https://github.com/vuejs/core/commit/67b6e0f894400f527fc5b20772ed124738df9446))
- **watch:** traverse refs in deep watch ([#1939](https://github.com/vuejs/core/issues/1939)) ([10293c7](https://github.com/vuejs/core/commit/10293c7a188021db9bb4386e12c490f1daf28126)), closes [#1900](https://github.com/vuejs/core/issues/1900)
- **runtime-core:** support variadic children in `h` for simple JSX compat ([54d06ec](https://github.com/vuejs/core/commit/54d06ec495a1743415de9426962024ffb764e4fe)), closes [#1917](https://github.com/vuejs/core/issues/1917)
- **compiler-core:** should attach key to single element child of `<template v-for>` ([#1910](https://github.com/vuejs/core/issues/1910)) ([69cfed6](https://github.com/vuejs/core/commit/69cfed6b313821d1ae7ecb02b63b0aaccb5599c6))
- **runtime-core:** correctly track dynamic nodes in renderSlot ([#1911](https://github.com/vuejs/core/issues/1911)) ([7ffb79c](https://github.com/vuejs/core/commit/7ffb79c56318861075a47bd2357e34cde8a6dad9))
- **runtime-core:** disable block tracking when calling compiled slot function in tempalte expressions ([f02e2f9](https://github.com/vuejs/core/commit/f02e2f99d9c2ca95f4fd984d7bd62178eceaa214)), closes [#1745](https://github.com/vuejs/core/issues/1745) [#1918](https://github.com/vuejs/core/issues/1918)
- **teleport:** only inherit el for non-patched nodes ([d4cc7b2](https://github.com/vuejs/core/commit/d4cc7b2496f9ed21ef6cac426697eac058da76bb)), closes [#1903](https://github.com/vuejs/core/issues/1903)
### Performance Improvements
- **reactivity:** improve ref performance by using class-based implementation ([#1900](https://github.com/vuejs/core/issues/1900)) ([07919e0](https://github.com/vuejs/core/commit/07919e00658592ebdb42f0c6f004f631c4bf4d34))
- **compiler-core:** generate NEED_PATCH flag for element with vnode hooks ([24041b7](https://github.com/vuejs/core/commit/24041b7ac1a22ca6c10bf2af81c9250af26bda34))
- **compiler-core:** v-if key error should only be checking same key on different branches ([de0c8a7](https://github.com/vuejs/core/commit/de0c8a7e3e8d2adfae4c4ef992cd5ac6262ca534))
- **reactivity:** accept subtypes of collections ([#1864](https://github.com/vuejs/core/issues/1864)) ([d005b57](https://github.com/vuejs/core/commit/d005b578b183f165929e1f921584ce599178cad6))
- **reactivity:** effect should still check sync self-trigger ([ac81dcf](https://github.com/vuejs/core/commit/ac81dcf0cc7f5fc722a0c14d1cc92ece5cc0db07))
- **reactivity:** readonly+reactive collection should also expose readonly+reactive values ([ed43810](https://github.com/vuejs/core/commit/ed4381020fcea0494f19f11bebabd9108f2dafd7)), closes [#1772](https://github.com/vuejs/core/issues/1772)
- **reactivity:** use isExtensible instead of isFrozen ([#1753](https://github.com/vuejs/core/issues/1753)) ([2787c34](https://github.com/vuejs/core/commit/2787c34cd436e3ec4656b6986d9d14d57911a7b5)), closes [#1784](https://github.com/vuejs/core/issues/1784)
- **runtime-core:** avoid manual slot invocation in template expressions interfering with block tracking ([791eff3](https://github.com/vuejs/core/commit/791eff3dfbd6be9ba8d597ecf8d943cd197f9807)), closes [#1745](https://github.com/vuejs/core/issues/1745)
- **runtime-core:** check if the key is string on undefined property warning ([#1731](https://github.com/vuejs/core/issues/1731)) ([ce78eac](https://github.com/vuejs/core/commit/ce78eac8e9cfa75a1409ce09ce9f02d4899188d3))
- **runtime-core:** fix beforeUpdate call timing to allow state mutation ([1eb6067](https://github.com/vuejs/core/commit/1eb6067a8598730c67b3b3a4ac459d2723aa858c)), closes [#1899](https://github.com/vuejs/core/issues/1899)
- **runtime-core:** fix Object props validation for objects with custom toStringTag ([6ccd9ac](https://github.com/vuejs/core/commit/6ccd9ac2bc8ea09978fbb99c272bff6614387e90)), closes [#1872](https://github.com/vuejs/core/issues/1872)
- **runtime-core:** separate null vs. non-null ref value updates ([#1835](https://github.com/vuejs/core/issues/1835)) ([3991ff0](https://github.com/vuejs/core/commit/3991ff03ceea89bbc149e864f754196d20c81f90)), closes [#1789](https://github.com/vuejs/core/issues/1789) [#1834](https://github.com/vuejs/core/issues/1834)
- **runtime-core/scheduler:** only allow watch callbacks to be self-triggering ([09702e9](https://github.com/vuejs/core/commit/09702e95b9a3f68fc1952ef74555dffa92d50032)), closes [#1740](https://github.com/vuejs/core/issues/1740) [#1727](https://github.com/vuejs/core/issues/1727)
- **runtime-core/scheduler:** sort postFlushCbs to ensure refs are set before lifecycle hooks ([#1854](https://github.com/vuejs/core/issues/1854)) ([caccec3](https://github.com/vuejs/core/commit/caccec3f78414ae294f1a813ffd16791d56da3a6)), closes [#1852](https://github.com/vuejs/core/issues/1852)
- **runtime-dom:** fix v-on same computed handler on multiple elements ([1c967fc](https://github.com/vuejs/core/commit/1c967fc44b971686d5a0e2811deb2362ec84979f)), closes [#1747](https://github.com/vuejs/core/issues/1747)
- **runtime-dom:** patch `form` as an attribute ([#1788](https://github.com/vuejs/core/issues/1788)) ([00683fc](https://github.com/vuejs/core/commit/00683fce9a1c6856be23b35ff0226d8ac5c96791)), closes [#1787](https://github.com/vuejs/core/issues/1787)
- **runtime-dom:** style binding multi value support ([0cd98c3](https://github.com/vuejs/core/commit/0cd98c3040a64df4577d188b9f2221224549a132)), closes [#1759](https://github.com/vuejs/core/issues/1759)
- **runtome-core:** do not cache property access in beforeCreate hook ([f6afe70](https://github.com/vuejs/core/commit/f6afe7000efb964355c439b7963087ab8e42d6b1)), closes [#1756](https://github.com/vuejs/core/issues/1756)
- **teleport:** always inherit root DOM nodes on patch ([#1836](https://github.com/vuejs/core/issues/1836)) ([517c2b8](https://github.com/vuejs/core/commit/517c2b8bdb9ffa53717c10d604ff6db84d50d4f2)), closes [#1813](https://github.com/vuejs/core/issues/1813)
- **transition:** transition should accept multiple handlers on same event ([48576e5](https://github.com/vuejs/core/commit/48576e582c4177572c2fd1764fbca53a6a30abe2)), closes [#1746](https://github.com/vuejs/core/issues/1746)
- **types:** handling PropType<Function> with default value ([#1896](https://github.com/vuejs/core/issues/1896)) ([c2913d5](https://github.com/vuejs/core/commit/c2913d57d14449775faf1f2e5647e6d1f3d3f920)), closes [#1891](https://github.com/vuejs/core/issues/1891)
- **types/jsx:** update innerHTML property in jsx typing ([#1814](https://github.com/vuejs/core/issues/1814)) ([b984d47](https://github.com/vuejs/core/commit/b984d47ac43a0aae2db5556a138a256fb5533ced))
- **watch:** allow handler to be a string ([#1775](https://github.com/vuejs/core/issues/1775)) ([b5f91ff](https://github.com/vuejs/core/commit/b5f91ff570244436aa8f579ec3a6fec781d198a7)), closes [#1774](https://github.com/vuejs/core/issues/1774)
- **watch:** pre-flush watcher watching props should trigger before component update ([d4c17fb](https://github.com/vuejs/core/commit/d4c17fb48b7880a4e3db6d48f8ab76540a3f59a2)), closes [#1763](https://github.com/vuejs/core/issues/1763)
- **watch:** should trigger watcher callback on triggerRef when watching ref source ([fce2689](https://github.com/vuejs/core/commit/fce2689ff1af0b632a2034403a6dfbcbff91aa60)), closes [#1736](https://github.com/vuejs/core/issues/1736)
- **reactivity:** return array when calling `toRefs` on array ([#1768](https://github.com/vuejs/core/issues/1768)) ([4172fdb](https://github.com/vuejs/core/commit/4172fdb90cd75d5741f843a227cfe9b5f5b22b35)), closes [#1764](https://github.com/vuejs/core/issues/1764)
- **runtime-core:** pass current props to prop default value functions ([0d508e9](https://github.com/vuejs/core/commit/0d508e9f51734409ac1aa57ba0ea98808be0a3a3)), closes [#1886](https://github.com/vuejs/core/issues/1886)
- **build:** fix component resolution when disabling options API ([a75b8a2](https://github.com/vuejs/core/commit/a75b8a268fca800a49c7d772b4a290b4435e85b9)), closes [#1688](https://github.com/vuejs/core/issues/1688)
- **compiler-core:** always compile Teleport and Suspense as blocks ([fbf865d](https://github.com/vuejs/core/commit/fbf865d9d4744a0233db1ed6e5543b8f3ef51e8d))
- **compiler-core:** prevent generating invalid code for v-bind with empty expression ([#1720](https://github.com/vuejs/core/issues/1720)) ([d452723](https://github.com/vuejs/core/commit/d4527230e40c4728e5becdd35c3e039f0992ae4c))
- **compiler-core/v-on:** only cache empty handler when the option is used ([5fbd1f4](https://github.com/vuejs/core/commit/5fbd1f4ccb22bf62bdf749460f8c6dadee3b6b89)), closes [#1716](https://github.com/vuejs/core/issues/1716)
- **compiler-sfc:** `less` and `stylus` output deps path is absolute p… ([#1685](https://github.com/vuejs/core/issues/1685)) ([578f25c](https://github.com/vuejs/core/commit/578f25c34efab0a71a7afd8bff278bd147a16a64))
- **compiler-sfc:** fix rewrite named export default ([#1675](https://github.com/vuejs/core/issues/1675)) ([452edb7](https://github.com/vuejs/core/commit/452edb73cb02c4aecb518a45df9b01aaa1516b19))
- **hmr:** should update el for `HYDRATE_EVENTS` patchFlags node ([#1707](https://github.com/vuejs/core/issues/1707)) ([de62cc0](https://github.com/vuejs/core/commit/de62cc040c22e3bd93222a9cc84b6564a4b08b51))
- **reactivity:** avoid tracking internal symbols in has trap ([7edfdf7](https://github.com/vuejs/core/commit/7edfdf7e239ef8f58a343f9802d675d84ed51d64)), closes [#1683](https://github.com/vuejs/core/issues/1683)
- **runtime-core:** dev root resolution should differentiate user comments vs v-if comments ([355c052](https://github.com/vuejs/core/commit/355c05262252b247ec29ed4c4fd6ab69143dd6b7)), closes [#1704](https://github.com/vuejs/core/issues/1704)
- **runtime-core:** fix scheduler dedupe when not flushing ([4ef5c8d](https://github.com/vuejs/core/commit/4ef5c8d42408fd444114604292106c0027600fa4))
- **runtime-core:** respect render function from mixins ([354d79c](https://github.com/vuejs/core/commit/354d79c42bf152643b77d83520757818d913de4f)), closes [#1630](https://github.com/vuejs/core/issues/1630)
- **runtime-core:** use correct container for moving `Teleport` content ([#1703](https://github.com/vuejs/core/issues/1703)) ([04a4eba](https://github.com/vuejs/core/commit/04a4ebaaeb4418d211293fc7b92c19c42a425cbd))
- **style-vars:** fix css vars on component with suspense as root ([#1718](https://github.com/vuejs/core/issues/1718)) ([07ece2e](https://github.com/vuejs/core/commit/07ece2e9260fe30a50e7cf317d2ff69f113ecad1))
- **v-model:** enable v-model type detection on custom elements ([0b3b1cf](https://github.com/vuejs/core/commit/0b3b1cfa487a359c8762794cfd74726d55b9ef8f))
- runtime compilation marker should be applied in exposed compile function ([b3b65b4](https://github.com/vuejs/core/commit/b3b65b40582d7fbdc776bfe8a1542b80aebe0aac))
- **v-model:** allow v-model usage on declared custom elements ([71c3c6e](https://github.com/vuejs/core/commit/71c3c6e2a03095ddd4c2a1e15957afd3ec8d4120)), closes [#1699](https://github.com/vuejs/core/issues/1699)
### Features
- **reactivity:** `proxyRefs` method and `ShallowUnwrapRefs` type ([#1682](https://github.com/vuejs/core/issues/1682)) ([aa06b10](https://github.com/vuejs/core/commit/aa06b1034d8268fa15cb6b4b6916440701238b2d))
- **sfc:** support resolving template components from `<script setup>` exports ([6f5d840](https://github.com/vuejs/core/commit/6f5d840612dbced2dbb4584c979a8f0cfc1f72f0))
- support delimiters option for runtime compilation ([ba17c87](https://github.com/vuejs/core/commit/ba17c871d80f833e064a51900d07efa358eafb89)), closes [#1679](https://github.com/vuejs/core/issues/1679)
### BREAKING CHANGES
- **reactivity:** template auto ref unwrapping are now applied shallowly,
i.e. only at the root level. See https://github.com/vuejs/core/pull/1682 for
- **build:** make transition tree-shakeable again ([ad199e1](https://github.com/vuejs/core/commit/ad199e1a252f80c85a8e40a4b4539ad27c39505c))
- **compiler-sfc:** `<style vars scoped>` prefixing should only apply to pre-transform source ([4951d43](https://github.com/vuejs/core/commit/4951d4352605eb9f4bcbea40ecc68fc6cbc3dce2)), closes [#1623](https://github.com/vuejs/core/issues/1623)
- **compiler-sfc:** use correct importer with `useCssVars` ([#1658](https://github.com/vuejs/core/issues/1658)) ([6f148d0](https://github.com/vuejs/core/commit/6f148d0b9a0630dc87c741ed951c82b639e776b2))
- **runtime-core:** do not use bail patchFlag on cloned vnodes ([6390ddf](https://github.com/vuejs/core/commit/6390ddfb7d0ed83ac4bae15d0497cba4de3e1972)), closes [#1665](https://github.com/vuejs/core/issues/1665)
- **runtime-core:** fix attr fallthrough on compiled framgent w/ single static element + comments ([1af3531](https://github.com/vuejs/core/commit/1af35317195772ea8f2728abc8f5ac159a5b7b75))
- **v-model:** v-model listeners should not fallthrough to plain element root ([c852bf1](https://github.com/vuejs/core/commit/c852bf18d7a51be0c3255357f0c30f39ae9bb540)), closes [#1643](https://github.com/vuejs/core/issues/1643)
- **compiler-core/internal:** add `onContextCreated` option to `generate` ([#1672](https://github.com/vuejs/core/issues/1672)) ([615dccd](https://github.com/vuejs/core/commit/615dccd00e7d85a3f4b82e62d6cb6c41f167d8c6))
- **runtime-core:** respect function name when using `defineComponent` function shorthand ([#1661](https://github.com/vuejs/core/issues/1661)) ([304830a](https://github.com/vuejs/core/commit/304830a764cd9f28098cfb0ac0e520e1bb2f57c7))
- provide ability to overwrite feature flags in esm-bundler builds ([54727f9](https://github.com/vuejs/core/commit/54727f9874abe8d0c99ee153d252269ae519b45d))
- **computed:** add readonly flag if no setter is provided ([#1654](https://github.com/vuejs/core/issues/1654)) ([dabdc5e](https://github.com/vuejs/core/commit/dabdc5e115514f98b5f8559a3819e96416939f43))
- **compiler-core/v-on:** fix codegen for event handler with newlines ([#1640](https://github.com/vuejs/core/issues/1640)) ([f9826fa](https://github.com/vuejs/core/commit/f9826fa963e67c495b8c44efb22b09b87df381de))
- **compiler-sfc:** use `filename` from options when compile styl preprocessor ([#1635](https://github.com/vuejs/core/issues/1635)) ([0526e5d](https://github.com/vuejs/core/commit/0526e5d7faa9ba69f76e7ff71fe96d93a4e99684))
- **runtime-core/hmr:** only use cloneNode mount optimization in prod ([4655d69](https://github.com/vuejs/core/commit/4655d699831b3356bb8be5b41c45da830dac9eb2)), closes [#1626](https://github.com/vuejs/core/issues/1626)
- **watch:** callback not called when using `flush:sync` ([#1633](https://github.com/vuejs/core/issues/1633)) ([8facaef](https://github.com/vuejs/core/commit/8facaefcc3eff1ca1fa19832172495e4272979e5))
- **watch:** post flush watchers should not fire when component is unmounted ([341b30c](https://github.com/vuejs/core/commit/341b30c961aa065fc59f0c2b592a11229cb6bd14)), closes [#1603](https://github.com/vuejs/core/issues/1603)
### Features
- **types:** deny unknown attributes on component by default ([#1614](https://github.com/vuejs/core/issues/1614)) ([5d8a64d](https://github.com/vuejs/core/commit/5d8a64d53a27ad57fe9940dd0d4d745dfbaf3c9e)), closes [#1519](https://github.com/vuejs/core/issues/1519)
- **types:** expose `DeepReadonly` type ([#1606](https://github.com/vuejs/core/issues/1606)) ([527c2c8](https://github.com/vuejs/core/commit/527c2c8bbb5c8fcfdf827dd985a09d7e7388cdad))
- Initial devtools support ([#1125](https://github.com/vuejs/core/issues/1125)) ([568b6db](https://github.com/vuejs/core/commit/568b6db12b9fa167569809dc0da7e0e3c026f204))
- **compiler-sfc:** prohibit src usage for `<script setup>` + do not ([af4b0c2](https://github.com/vuejs/core/commit/af4b0c2cf18b63990bc266eb0871a50ba2004fc0))
- **runtime-dom:** unref when setting `useCssVars` ([44e6da1](https://github.com/vuejs/core/commit/44e6da1402fa2b6f5a0a0c692cd693a8ff1a40a3))
- **slots:** properly force update on forwarded slots ([aab99ab](https://github.com/vuejs/core/commit/aab99abd28a5d17f2d1966678b0d334975d21877)), closes [#1594](https://github.com/vuejs/core/issues/1594)
### Features
- **compiler-sfc:** export dependencies for css and css preprocessors ([#1278](https://github.com/vuejs/core/issues/1278)) ([e41d831](https://github.com/vuejs/core/commit/e41d8310de0d9299fce2bccd57af4e30b74e3795))
- **hmr:** fix hmr updates for reused hoisted trees ([5f61aa0](https://github.com/vuejs/core/commit/5f61aa0f719cbd90182af1e27fad37b91c2c351e))
- **runtime-core:** do not call transition enter hooks when mounting in suspense ([#1588](https://github.com/vuejs/core/issues/1588)) ([246ec5c](https://github.com/vuejs/core/commit/246ec5c594650f3fcccd0de94aa3f97b4d705e42)), closes [#1583](https://github.com/vuejs/core/issues/1583)
- **v-model:** handle more edge cases in `looseEqual()` ([#379](https://github.com/vuejs/core/issues/379)) ([fe1b27b](https://github.com/vuejs/core/commit/fe1b27b7f875e1c8aece12b04531e7fa3184be27))
### Features
- **types/reactivity:** use `DeepReadonly` type for `readonly` return type ([#1462](https://github.com/vuejs/core/issues/1462)) ([b772bba](https://github.com/vuejs/core/commit/b772bba5587726e78b20ccb9b61374120bd4b0ae)), closes [#1452](https://github.com/vuejs/core/issues/1452)
- **runtime-core:** avoid `scopeId` as attr for slot nodes with same `scopeId` ([#1561](https://github.com/vuejs/core/issues/1561)) ([583a1c7](https://github.com/vuejs/core/commit/583a1c7b45e67e9cd57e411853c20509248def89)), closes [vitejs/vite#536](https://github.com/vitejs/vite/issues/536)
- **runtime-core/emits:** merge emits options from mixins/extends ([ba3b3cd](https://github.com/vuejs/core/commit/ba3b3cdda98f6efb5d4c4fafc579b8f568a19bde)), closes [#1562](https://github.com/vuejs/core/issues/1562)
- **runtime-dom:** remove attrs with nullish values ([cb6a091](https://github.com/vuejs/core/commit/cb6a0915c540af94f5d79c311022b99bc17f2965)), closes [#1576](https://github.com/vuejs/core/issues/1576)
- **runtime-dom/v-on:** only block event handlers based on attach timestamp ([8b320cc](https://github.com/vuejs/core/commit/8b320cc12f74aafea9ec69f7ce70231d4f0d08fd)), closes [#1565](https://github.com/vuejs/core/issues/1565)
- **compiler-sfc:** allow using :deep, :global & :slotted for short in `<style scoped>` ([f3cc41f](https://github.com/vuejs/core/commit/f3cc41f0c8713475f2aa592bae3d82ffbc6b1300))
- **compiler-core/v-on:** bail caching for member expression handlers on components ([87c2a1e](https://github.com/vuejs/core/commit/87c2a1e50f5317a0c47051b06f419e60e5644a1a)), closes [#1541](https://github.com/vuejs/core/issues/1541)
- **compiler-dom:** should ignore and warn side effect tags like script and style ([5e52f4e](https://github.com/vuejs/core/commit/5e52f4e4d7c92ee8ec9c0d644735e23342965096))
- **runtime-core:** should allow v-model listeners to fallthrough, but ignore for warning ([903e8f6](https://github.com/vuejs/core/commit/903e8f697e4377e0ae92e1a6b58777438fba3610)), closes [#1543](https://github.com/vuejs/core/issues/1543)
- **compiler-core:** add `\r` to accepted chars after end tag name ([#1515](https://github.com/vuejs/core/issues/1515)) ([64e2f46](https://github.com/vuejs/core/commit/64e2f4643602c5980361e66674141e61ba60ef70)), closes [#1476](https://github.com/vuejs/core/issues/1476)
- **keep-alive:** fix keep-alive with scopeId/fallthrough attrs ([d86b01b](https://github.com/vuejs/core/commit/d86b01ba3a29e2e04c13597a1b9123ca35beaf57)), closes [#1511](https://github.com/vuejs/core/issues/1511)
- **runtime-core/template-ref:** template ref used in the same template should trigger update ([36b6b4f](https://github.com/vuejs/core/commit/36b6b4f0228c4adf679c232bf4d1e8cff7fb6474)), closes [#1505](https://github.com/vuejs/core/issues/1505)
- **runtime-dom:** should set `<input list="...">` as attribute ([441c236](https://github.com/vuejs/core/commit/441c23602f57d00b00fa3a590b30487003efe210)), closes [#1526](https://github.com/vuejs/core/issues/1526)
- **runtime-dom/style:** fix `patchStyle` on falsy next value ([#1504](https://github.com/vuejs/core/issues/1504)) ([77538ec](https://github.com/vuejs/core/commit/77538ec6d90fee66d229d6d3a4f977c6b548a9bd)), closes [#1506](https://github.com/vuejs/core/issues/1506)
- **ssr:** support dynamic components that resolve to element or vnode ([41db49d](https://github.com/vuejs/core/commit/41db49dfb7c520c4f743e522a03f06b33259a2eb)), closes [#1508](https://github.com/vuejs/core/issues/1508)
- **runtime-core:** avoid accidental access of `Object.prototype` properties ([f3e9c1b](https://github.com/vuejs/core/commit/f3e9c1b59d5d3999ac6180ed75c84d88b29c41e6))
- ensure vnode hooks are called consistently regardless of keep-alive ([4e8e689](https://github.com/vuejs/core/commit/4e8e689572dcae0cb468989c5e0c531a837a900b))
- **runtime-core:** pass unmount into initial mount patch prop ([2bdb5c1](https://github.com/vuejs/core/commit/2bdb5c146449092623f06e20fb71ebaca7e5588f))
- **runtime-dom:** allow force updating value bindings for controlled inputs ([b3536d8](https://github.com/vuejs/core/commit/b3536d87a587dc1e78c8712cb29ca61ca0931ac9)), closes [#1471](https://github.com/vuejs/core/issues/1471)
- **slots:** make compiled slot marker non-enumerable ([062835d](https://github.com/vuejs/core/commit/062835d45aaf4168ddf2e39a5c7e162b3a18ccae)), closes [#1470](https://github.com/vuejs/core/issues/1470)
### Features
- **runtime-core:** support creating vnode from existing vnode ([c9629f2](https://github.com/vuejs/core/commit/c9629f26924fcb3c51994549a3013ccc05c1030a))
- **runtime-dom:** allow force updating value bindings for controlled inputs ([b3536d8](https://github.com/vuejs/core/commit/b3536d87a587dc1e78c8712cb29ca61ca0931ac9)), closes [#1471](https://github.com/vuejs/core/issues/1471)
- **slots:** make compiled slot marker non-enumerable ([062835d](https://github.com/vuejs/core/commit/062835d45aaf4168ddf2e39a5c7e162b3a18ccae)), closes [#1470](https://github.com/vuejs/core/issues/1470)
- **BaseTransition:** collect correct children with slot passthrough in `Transition` ([#1456](https://github.com/vuejs/core/issues/1456)) ([d4cd128](https://github.com/vuejs/core/commit/d4cd12887eba18c4aff02b85834679bfe679f878)), closes [#1455](https://github.com/vuejs/core/issues/1455)
- **compiler-core:** ignore comment nodes in transition children ([e52b7cd](https://github.com/vuejs/core/commit/e52b7cd7e7c10d8dbad92000ab3d5f2e02533e39)), closes [#1352](https://github.com/vuejs/core/issues/1352)
- **compiler-core:** should not prefix object method ([#1375](https://github.com/vuejs/core/issues/1375)) ([35dbef2](https://github.com/vuejs/core/commit/35dbef268ca43234aa8544a62dfa4240dcc2974e))
- **compiler-core:** skip empty expressions when validating expressions in browser mode ([afb231e](https://github.com/vuejs/core/commit/afb231ec5ce5ac77ff6260bea4d866ec2d5bbd85))
- **compiler-sfc:** `transformAssetUrl` should ignore inline data url ([#1431](https://github.com/vuejs/core/issues/1431)) ([90c285c](https://github.com/vuejs/core/commit/90c285c5c8ac13afb4932974c1f9aede15e81337))
- **runtime-core:** always check props presence in public instance proxy ([e0d19a6](https://github.com/vuejs/core/commit/e0d19a695316a8a459274874d304872fea384851)), closes [#1236](https://github.com/vuejs/core/issues/1236)
- **runtime-core:** `cloneVNode` should preserve correct ctx instance when normalizing ref ([be69bee](https://github.com/vuejs/core/commit/be69beed5ed05067006c297589598b33e7108b1b)), closes [#1311](https://github.com/vuejs/core/issues/1311)
- **runtime-core:** component root should inherit `scopeId` from `VNode` ([f3f94e4](https://github.com/vuejs/core/commit/f3f94e4deb40d3a0d83804454874833b194f83da)), closes [#1399](https://github.com/vuejs/core/issues/1399)
- **runtime-core:** fix component name inference in warnings ([e765d81](https://github.com/vuejs/core/commit/e765d814048c2cdc3cc32bdffb73c6e59b0d747d)), closes [#1418](https://github.com/vuejs/core/issues/1418)
- **runtime-core:** fix parent el update on nested HOC self-update ([#1360](https://github.com/vuejs/core/issues/1360)) ([6c8bfa1](https://github.com/vuejs/core/commit/6c8bfa10189d1a5a6837d2e25a9451889a0e19d6)), closes [#1357](https://github.com/vuejs/core/issues/1357)
- **runtime-core:** fix `scopeId` inheritance for component inside slots ([978d952](https://github.com/vuejs/core/commit/978d9522e80cb19257ee2f4c8ba5da6f8aa6b3d2))
- **runtime-core:** handle patch flag de-op from cloned vnode ([0dd5cde](https://github.com/vuejs/core/commit/0dd5cde861735e80cfe21537380e52789cc865f8)), closes [#1426](https://github.com/vuejs/core/issues/1426)
- **transition:** fix css:false with hooks with no explicit done callback ([9edbc27](https://github.com/vuejs/core/commit/9edbc27f45aafaa6bc27ab244dc77d4d86d09fc4)), closes [#1149](https://github.com/vuejs/core/issues/1149)
- **transition:** fix dom transition cancel hooks not being called ([acd3156](https://github.com/vuejs/core/commit/acd3156d2c45609ab04cb54734258fe340c4ca02))
- **transition-group:** vue 2 compatible handling of transition-group w/ multiple v-for children ([86d3972](https://github.com/vuejs/core/commit/86d3972855990c23f583a4b11b3c86fe04f1ab90)), closes [#1126](https://github.com/vuejs/core/issues/1126)
- **types:** ensure correct public props interface for `defineComponent` instance type ([2961e14](https://github.com/vuejs/core/commit/2961e149c9825d56680e982acd056d9f337afc5e)), closes [#1385](https://github.com/vuejs/core/issues/1385)
- **types:** should unwrap array -> object -> ref ([82b28a5](https://github.com/vuejs/core/commit/82b28a5ecb95be1565e50427bfd5eefe4b2d408c))
- **v-show:** fix v-show unmount with falsy value ([#1403](https://github.com/vuejs/core/issues/1403)) ([d7beea0](https://github.com/vuejs/core/commit/d7beea015bdb208d89a2352a5d43cc1913f87337)), closes [#1401](https://github.com/vuejs/core/issues/1401)
### Features
- **runtime-core:** expose version on app instance ([056cac9](https://github.com/vuejs/core/commit/056cac91855e644e94cd704ff5462c4e1acba66b)), closes [#1449](https://github.com/vuejs/core/issues/1449)
- **compiler-core:** treat v-for with constant exp as a stable fragment ([#1394](https://github.com/vuejs/core/issues/1394)) ([8a2cf21](https://github.com/vuejs/core/commit/8a2cf21b717411e4e66f9223e9f6d1c5c817c6ac))
- **reactivity:** should not track `__v_isRef` ([#1392](https://github.com/vuejs/core/issues/1392)) ([c43a6e6](https://github.com/vuejs/core/commit/c43a6e61a0952c629cfb062f67e8eb27a0f6f227))
- **build:** retain main vue package side effect for compiler registration ([dc986ad](https://github.com/vuejs/core/commit/dc986addd9f6c57a4d3d13b0f97132064a8d76a4)), closes [#1263](https://github.com/vuejs/core/issues/1263)
- **compiler-core:** allow multiline expression on v-model and v-on ([#1234](https://github.com/vuejs/core/issues/1234)) ([958b6c8](https://github.com/vuejs/core/commit/958b6c80cf2e07ef6e829b5b5d698fd61c25b91f))
- **compiler-core:** bail static stringfication even threshold is met ([#1298](https://github.com/vuejs/core/issues/1298)) ([64ec8bf](https://github.com/vuejs/core/commit/64ec8bfb54b97036d9cde765d923443ec8bc02b9)), closes [#1128](https://github.com/vuejs/core/issues/1128)
- **compiler-core:** fix parsing for directive with dynamic argument containing dots ([0d26413](https://github.com/vuejs/core/commit/0d26413433d41389f5525a0ef2c2dd7cfbb454d4))
- **compiler-core:** support static slot names containing dots for 2.x compat ([825ec15](https://github.com/vuejs/core/commit/825ec1500feda8b0c43245e7e92074af7f9dcca2)), closes [#1241](https://github.com/vuejs/core/issues/1241)
- **hmr:** force full update on nested child components ([#1312](https://github.com/vuejs/core/issues/1312)) ([8f2a748](https://github.com/vuejs/core/commit/8f2a7489b7c74f5cfc1844697c60287c37fc0eb8))
- **runtime-core:** should pass instance to patchProp on mount for event error handling ([#1337](https://github.com/vuejs/core/issues/1337)) ([aac9b03](https://github.com/vuejs/core/commit/aac9b03c11c9be0c67b924004364a42d04d78195)), closes [#1336](https://github.com/vuejs/core/issues/1336)
- **runtime-core:** track access to $attrs ([6abac87](https://github.com/vuejs/core/commit/6abac87b3d1b7a22df80b7a70a10101a7f3d3732)), closes [#1346](https://github.com/vuejs/core/issues/1346)
- always treat spellcheck and draggable as attributes ([4492b88](https://github.com/vuejs/core/commit/4492b88938922a7f1bcc36a608375ad99f16b22e)), closes [#1350](https://github.com/vuejs/core/issues/1350)
- **compiler-dom:** add tfoot,caption,col element on bail stringification ([#1333](https://github.com/vuejs/core/issues/1333)) ([fbaf52a](https://github.com/vuejs/core/commit/fbaf52ae9fdd412e517e7edf44544db5d759dd2c))
- **compiler-dom:** bail stringification on table elements ([a938b61](https://github.com/vuejs/core/commit/a938b61edca63c1f03f99b85de3f2a3a519268e6)), closes [#1230](https://github.com/vuejs/core/issues/1230) [#1268](https://github.com/vuejs/core/issues/1268)
- **compiler-sfc:** asset url transform should ignore direct hash urls ([5ddd9d2](https://github.com/vuejs/core/commit/5ddd9d241747ef785de848d19246ef518abd8b8f))
- **compiler-ssr:** should escape template string interpolation chars in generated code ([5f15d9a](https://github.com/vuejs/core/commit/5f15d9aa4b9024b3764b962bee042d72f94dee91))
- **hmr:** force full update in child component on slot update ([2408a65](https://github.com/vuejs/core/commit/2408a656627358b21aa49209e64d14a1aeec7825))
- **reactivity:** replaced ref in reactive object should be tracked ([#1058](https://github.com/vuejs/core/issues/1058)) ([80e1693](https://github.com/vuejs/core/commit/80e1693e1f525a6c5811689fbeaccdccae1e2c23))
- **reactivity:** shallowReactive collection to not-readonly ([#1212](https://github.com/vuejs/core/issues/1212)) ([c97d1ba](https://github.com/vuejs/core/commit/c97d1bae56c3643304165d0e5b7924e5a0aad2df))
- **runtime-core:** default value for function type prop ([#1349](https://github.com/vuejs/core/issues/1349)) ([d437a01](https://github.com/vuejs/core/commit/d437a0145df5b63a959da873041816af68b440db)), closes [#1348](https://github.com/vuejs/core/issues/1348)
- **runtime-core:** mount children before setting element props ([8084156](https://github.com/vuejs/core/commit/8084156f4d0b572716a685a561d5087cddceab2c)), closes [#1318](https://github.com/vuejs/core/issues/1318) [#1320](https://github.com/vuejs/core/issues/1320)
- **runtime-core:** respect props from mixins and extends ([2417a0c](https://github.com/vuejs/core/commit/2417a0cb302ed72e145986f85422470713edf2d8)), closes [#1236](https://github.com/vuejs/core/issues/1236) [#1250](https://github.com/vuejs/core/issues/1250)
- **runtime-core:** use array destructuring instead of object for edge compat ([#1302](https://github.com/vuejs/core/issues/1302)) ([4a5021e](https://github.com/vuejs/core/commit/4a5021e763b7f49069e1f3d488bdddf910f09f3f)), closes [#1294](https://github.com/vuejs/core/issues/1294)
- **runtime-dom:** compatibility for cases where event.timeStamp is 0 ([#1328](https://github.com/vuejs/core/issues/1328)) ([90c3532](https://github.com/vuejs/core/commit/90c35329468e1fbb5cd2c1df2e4efd5b12b4fd41)), closes [#1325](https://github.com/vuejs/core/issues/1325)
- **types:** add RawSlots in h signature ([#1293](https://github.com/vuejs/core/issues/1293)) ([cab769f](https://github.com/vuejs/core/commit/cab769f174f4c0bcad59454e4a77039830e796f8))
- bail stringification for slots ([9b5d13e](https://github.com/vuejs/core/commit/9b5d13e598686b0a73bc8f4a0f5581f066c3e923)), closes [#1281](https://github.com/vuejs/core/issues/1281) [#1286](https://github.com/vuejs/core/issues/1286)
- **ssr:** should set ref on hydration ([0a7932c](https://github.com/vuejs/core/commit/0a7932c6b3e6b6fdda27fa7161726a615a598355))
- run ci ([6b889e7](https://github.com/vuejs/core/commit/6b889e7c8a599c829f9a240fdcdce3299fbd0e6d))
### Features
- **compiler:** better warning for invalid expressions in function/browser mode ([e29f0b3](https://github.com/vuejs/core/commit/e29f0b3fc2b10c76264cdd8e49c2ab4260286fd6)), closes [#1266](https://github.com/vuejs/core/issues/1266)
- **types:** adjust type exports for manual render function and tooling usage ([e4dc03a](https://github.com/vuejs/core/commit/e4dc03a8b17d5e9f167de6a62a645878ac7ef3e2)), closes [#1329](https://github.com/vuejs/core/issues/1329)
- **types:** mixins/extends support in TypeScript ([#626](https://github.com/vuejs/core/issues/626)) ([d3c436a](https://github.com/vuejs/core/commit/d3c436ae2e66b75b7f2ed574dadda3f0e1fdce73))
- **types:** support typing directive value via generic argument ([#1007](https://github.com/vuejs/core/issues/1007)) ([419b86d](https://github.com/vuejs/core/commit/419b86d1908f2a0521e6a7eafcbee764e9ee59a0)), closes [#998](https://github.com/vuejs/core/issues/998)
- only patch string style when value has changed ([#1310](https://github.com/vuejs/core/issues/1310)) ([d4e9b19](https://github.com/vuejs/core/commit/d4e9b19932dac686f57091e66f21a80d4c5db881)), closes [#1309](https://github.com/vuejs/core/issues/1309)
- optimize LRU access in keep-alive ([#1316](https://github.com/vuejs/core/issues/1316)) ([1f2926a](https://github.com/vuejs/core/commit/1f2926a33c78b6a6f4752a01b88f7cad809ed302))
- **compiler-dom:** should bail stringification on runtime constant regardless of position ([dd2bfb5](https://github.com/vuejs/core/commit/dd2bfb5a8f5b897a621b3ebb89a9fb1b8e4c63cd)), closes [vuejs/vite#157](https://github.com/vuejs/vite/issues/157)
- **reactivity:** shallowReactive for collections ([#1204](https://github.com/vuejs/core/issues/1204)) ([488e2bc](https://github.com/vuejs/core/commit/488e2bcfef8dd69d15c224d94a433680db140ef9)), closes [#1202](https://github.com/vuejs/core/issues/1202)
- **runtime-dom:** event handlers with modifiers should get all event arguments ([#1193](https://github.com/vuejs/core/issues/1193)) ([ab86b19](https://github.com/vuejs/core/commit/ab86b190ce540336a01f936baa836f1aefd90e85))
- **v-model:** should not trigger updates during input composition ([#1183](https://github.com/vuejs/core/issues/1183)) ([83b7158](https://github.com/vuejs/core/commit/83b7158017325db03e5c677b5f1c6adfe41d1ca4))
### Features
- **watch:** support directly watching reactive object in multiple sources with deep default ([#1201](https://github.com/vuejs/core/issues/1201)) ([ba62ccd](https://github.com/vuejs/core/commit/ba62ccd55d659a874ece4b26454ae31c6de72f59))
- **hmr:** static child traversal should only affect elements ([2bc6a8c](https://github.com/vuejs/core/commit/2bc6a8c1cf4f409eea0cefa8b8a7619aae1f3569))
- **hmr:** always force full child component props update in HMR mode ([1b946c8](https://github.com/vuejs/core/commit/1b946c85df3d213900faccfa0723d736fa0927a3))
- **hmr:** ensure static nodes inherit DOM element in hmr mode ([66c5a55](https://github.com/vuejs/core/commit/66c5a556dc5b27e9a72fa7176fbb45d8c4c515b7)), closes [#1156](https://github.com/vuejs/core/issues/1156)
- **runtime-core:** should not take unmount children fast path for v-for fragments ([5b8883a](https://github.com/vuejs/core/commit/5b8883a84689dd04dbbcd677bf177ffeda43489d)), closes [#1153](https://github.com/vuejs/core/issues/1153)
- **transition:** should reset enter class after appear ([#1152](https://github.com/vuejs/core/issues/1152)) ([697de07](https://github.com/vuejs/core/commit/697de07e630c502db42e93e64ba556cc4599cbe4))
- **compiler:** warn against v-bind with empty attribute value ([675330b](https://github.com/vuejs/core/commit/675330ba542022935ebbb2d31af3ba643c37a5eb)), closes [github.com/vuejs/core/issues/1128#issuecomment-624647434](https://github.com/vuejs/core/issues/1128#issuecomment-624647434)
- **compiler-sfc:** should not transform external asset url with ([d662118](https://github.com/vuejs/core/commit/d66211849ca174c4458b59d3df5569730ee224f6))
- **compiler-sfc:** template with alt lang should be parsed as raw text ([d10835a](https://github.com/vuejs/core/commit/d10835aee73e3be579c728df634fbaa8fe3a0e0f)), closes [#1120](https://github.com/vuejs/core/issues/1120)
- **reactivity:** fix `__proto__` access on proxy objects ([#1133](https://github.com/vuejs/core/issues/1133)) ([037fa07](https://github.com/vuejs/core/commit/037fa07113eff6792cda58f91169d26cf6033aea))
- **reactivity:** use correct thisArg for collection method callbacks ([#1132](https://github.com/vuejs/core/issues/1132)) ([e08f6f0](https://github.com/vuejs/core/commit/e08f6f0ede03d09e71e44de5e524abd9789971d8))
- **runtime-dom/style:** normalize string when merging styles ([#1127](https://github.com/vuejs/core/issues/1127)) ([2d9f136](https://github.com/vuejs/core/commit/2d9f1360778154a232473fcf93f6164a6bd80ca5))
### Code Refactoring
- **compiler/types:** convert compiler options documentation to jsdoc ([e58beec](https://github.com/vuejs/core/commit/e58beecc97635ea61e39b84ea406fcc42166095b))
- **compiler-sfc:** only add character mapping if not whitespace ([2f69167](https://github.com/vuejs/core/commit/2f69167e889f2817138629a04c01c6baf565d485))
### BREAKING CHANGES
- **compiler/types:** `getTextMode` compiler option signature has changed from
- **hmr:** handle cases where instances with same id having different definitions ([01b7e90](https://github.com/vuejs/core/commit/01b7e90eac88c79ed38a396f824f71c6653736c8))
- **reactivity:** check own property for existing proxy of target ([6be2b73](https://github.com/vuejs/core/commit/6be2b73f8aeb26be72eab22259c8a513b59b910f)), closes [#1107](https://github.com/vuejs/core/issues/1107)
- **transitionGroup:** inner children should skip comment node ([#1105](https://github.com/vuejs/core/issues/1105)) ([26a50ce](https://github.com/vuejs/core/commit/26a50ce67f64439cfc242fba59b1e7129e59ba40))
- **types/reactivity:** fix ref type inference on nested reactive properties with .value ([bc1f097](https://github.com/vuejs/core/commit/bc1f097e29c5c823737503532baa23c11d4824f8)), closes [#1111](https://github.com/vuejs/core/issues/1111)
### Features
- **shared:** support Map and Set in toDisplayString ([3c60d40](https://github.com/vuejs/core/commit/3c60d40827f65cbff024cfda4bb981a742bb83a7)), closes [#1067](https://github.com/vuejs/core/issues/1067) [#1100](https://github.com/vuejs/core/issues/1100)
- **types:** re-expose resolve asset utitlies and registerRuntimeCompiler in type definitions ([64ef7c7](https://github.com/vuejs/core/commit/64ef7c76bf0dfa4897d930e9d369a026d1ecbaf6)), closes [#1109](https://github.com/vuejs/core/issues/1109)
- **watch:** support directly watching reactive object with deep default ([6b33cc4](https://github.com/vuejs/core/commit/6b33cc422933a004fb116fc5182b3fa3a32567ff)), closes [#1110](https://github.com/vuejs/core/issues/1110)
- **compiler-core:** hoist pure annotations should apply to all nested calls ([c5e7d8b](https://github.com/vuejs/core/commit/c5e7d8b532685e1e33e1cfb316f75c1b61109ee7))
- **compiler-core:** hoisted vnode calls and scoped id calls should be marked pure ([cad25d9](https://github.com/vuejs/core/commit/cad25d95a3171628b0c95e89fb8e52eb5f41bbc5))
- **runtime-core:** avoid infinite warning loop for isRef check on component public proxy ([6233608](https://github.com/vuejs/core/commit/62336085f497d42f0007bf9ad33f078d273605a6)), closes [#1091](https://github.com/vuejs/core/issues/1091)
- **runtime-core:** cloned vnodes with extra props should de-opt ([08bf7e3](https://github.com/vuejs/core/commit/08bf7e360783d520bae3fbe37143c52d360bd52d))
- **runtime-core:** fix slot fragment bail check ([ac6a6f1](https://github.com/vuejs/core/commit/ac6a6f11ac3931c723c9aca8a351768ea2cacf38))
- **runtime-core:** should catch dom prop set TypeErrors ([98bee59](https://github.com/vuejs/core/commit/98bee596bddc8131cccfde4a11fa2e5cd9bf39e4)), closes [#1051](https://github.com/vuejs/core/issues/1051)
- **runtime-dom:** should not coerce nullish values to empty strings for non-string dom props ([20bc7ba](https://github.com/vuejs/core/commit/20bc7ba1c55b43143a4cef98cadaad8d693f9275)), closes [#1049](https://github.com/vuejs/core/issues/1049) [#1092](https://github.com/vuejs/core/issues/1092) [#1093](https://github.com/vuejs/core/issues/1093) [#1094](https://github.com/vuejs/core/issues/1094)
- **ssr:** fix escape and handling for raw Text, Comment and Static vnodes ([5b09e74](https://github.com/vuejs/core/commit/5b09e743a01a4dbc73b98ecf130a3a5f95ce41fe))
- **teleport:** teleport should always be tracked as dynamic child for unmount ([7f23555](https://github.com/vuejs/core/commit/7f2355535613f1f5f5902cc7ca235fca8ee5493c)), closes [#1088](https://github.com/vuejs/core/issues/1088)
- **types:** mark internal API exports and exclude from d.ts ([c9bf7de](https://github.com/vuejs/core/commit/c9bf7ded2e74790c902384e13c1d444c7136c1f9))
### Features
- **runtime-core:** warn against user properties with reserved prefixes ([1bddeea](https://github.com/vuejs/core/commit/1bddeea24797fe5c66e469bb6bc526c17bfb7fde))
### Performance Improvements
- instance public proxy should never be observed ([11f38d8](https://github.com/vuejs/core/commit/11f38d8a853b2d8043212c17612b63df92322de4))
### BREAKING CHANGES
- **types:** Internal APIs are now excluded from type declarations.
- **hmr:** support hmr for static nodes ([386b093](https://github.com/vuejs/core/commit/386b093554c8665fa6a9313b61c0a9359c4ec819))
- **hydration:** fix text mismatch warning ([e087b4e](https://github.com/vuejs/core/commit/e087b4e02467db18766b7acc2218b3d38d60ce8b))
- **keep-alive:** do not invoke onVnodeBeforeUnmount if is KeepAlive component ([#1079](https://github.com/vuejs/core/issues/1079)) ([239270c](https://github.com/vuejs/core/commit/239270c38a56782bd7f29802cb583b0a8a5a4df4))
- **transition-group:** should collect raw children with Fragment ([#1046](https://github.com/vuejs/core/issues/1046)) ([8ed3455](https://github.com/vuejs/core/commit/8ed3455251d721e62fd7f6f75a7ef04bc411c152)), closes [#1045](https://github.com/vuejs/core/issues/1045)
- **warning:** always check for component instance presence when formatting traces ([a0e2c12](https://github.com/vuejs/core/commit/a0e2c1287466567d945e87496ce2f922f3dc6d8c))
- **compiler-core:** dynamic component should always be made blocks ([7d0ab33](https://github.com/vuejs/core/commit/7d0ab3392af5285147db111759fe380688ca17ea)), closes [#1018](https://github.com/vuejs/core/issues/1018)
- **runtime-core:** dynamic component should support falsy values without warning ([ded92f9](https://github.com/vuejs/core/commit/ded92f93b423cda28a40746c1f5fa9bcba56e80d))
- **runtime-core:** fix dynamic node tracking in dynamic component that resolves to plain elements ([dcf2458](https://github.com/vuejs/core/commit/dcf2458fa84d7573273b0306aaabcf28ee859622)), closes [#1039](https://github.com/vuejs/core/issues/1039)
- **runtime-core:** fix key/ref resolution for cloneVNode ([d7379c7](https://github.com/vuejs/core/commit/d7379c7647e3222eddd18d7dad8d2520f59deb8a)), closes [#1041](https://github.com/vuejs/core/issues/1041)
- **runtime-core:** mixin options that rely on this context should be deferred ([ff4d1fc](https://github.com/vuejs/core/commit/ff4d1fcd81d96f3ddb0e34f04e70e3539dc7a96f)), closes [#1016](https://github.com/vuejs/core/issues/1016) [#1029](https://github.com/vuejs/core/issues/1029)
- **runtime-core:** only infer component name for object components ([e422b8b](https://github.com/vuejs/core/commit/e422b8b082f1765f596c3ae0ff5b2e65d756405a)), closes [#1023](https://github.com/vuejs/core/issues/1023)
- **slots:** compiled slot fallback should be functions ([#1030](https://github.com/vuejs/core/issues/1030)) ([2b19965](https://github.com/vuejs/core/commit/2b19965bcf75d981400ed58a0348bcfc13f17e33)), closes [#1021](https://github.com/vuejs/core/issues/1021)
- **types:** fix ref(false) type to Ref<boolean> ([#1028](https://github.com/vuejs/core/issues/1028)) ([0bdd889](https://github.com/vuejs/core/commit/0bdd8891569eb15e492007b3eb0f45d598e85b3f))
- **types:** make return type of `defineComponent` assignable to `Component` type ([#1032](https://github.com/vuejs/core/issues/1032)) ([f3a9b51](https://github.com/vuejs/core/commit/f3a9b516bd6feb42d1ea611faf6550f709fd3173)), closes [#993](https://github.com/vuejs/core/issues/993)
- **compiler-sfc:** built-in support for css modules ([fa216a0](https://github.com/vuejs/core/commit/fa216a0c3adc70ff74deca872e295a154fa147c8))
- **reactivity:** add triggerRef API ([2acf3e8](https://github.com/vuejs/core/commit/2acf3e84b95d7f18925b4d7ada92f1992f5b7ee3))
- **types:** expose `ToRefs` type ([#1037](https://github.com/vuejs/core/issues/1037)) ([28b4c31](https://github.com/vuejs/core/commit/28b4c317b412e0c08bb791d647d4234078c41542))
### Performance Improvements
- **reactivity:** ref should not trigger if value did not change ([b0d4df9](https://github.com/vuejs/core/commit/b0d4df974339a570fd30263797cf948619e1f57b)), closes [#1012](https://github.com/vuejs/core/issues/1012)
- **runtime-core:** should not cast prop value if prop did not change ([171cfa4](https://github.com/vuejs/core/commit/171cfa404f33a451376dcb84d66ddae012c343ec)), closes [#999](https://github.com/vuejs/core/issues/999)
- **warn:** fix component name inference in warning trace ([0278992](https://github.com/vuejs/core/commit/0278992f78834bc8df677c4e8ec891bb79510edb))
### Features
- **build:** provide more specific warnings for runtime compilation ([e954ba2](https://github.com/vuejs/core/commit/e954ba21f04f0ef848c687233fcb849d75e4153f)), closes [#1004](https://github.com/vuejs/core/issues/1004)
- **runtime-core:** more specific warning for failed v-on fallthrough ([ab844fd](https://github.com/vuejs/core/commit/ab844fd1692007cf2be4d01a9062caa36fa1d280)), closes [#1001](https://github.com/vuejs/core/issues/1001)
- **warn:** infer anonymous component named based on resolve name ([dece610](https://github.com/vuejs/core/commit/dece6102aa84c115a3d6481c6e0f27e5b4be3ef1))
### Performance Improvements
- **core:** use `startsWith` instead of `indexOf` ([#989](https://github.com/vuejs/core/issues/989)) ([054ccec](https://github.com/vuejs/core/commit/054ccecd58c36b909661598f43a4056ed07e59c2))
- **runtime-core:** fix user attached public instance properties that start with "$" ([d7ca1c5](https://github.com/vuejs/core/commit/d7ca1c5c6e75648793d670299c9059b6db9b1715))
- **watch:** fix deep watchers on refs containing primitives ([#984](https://github.com/vuejs/core/issues/984)) ([99fd158](https://github.com/vuejs/core/commit/99fd158d090594a433b57d9ff9420f3aed48ad2d))
### Features
- **types:** expose `ComponentCustomOptions` for declaring custom options ([c0adb67](https://github.com/vuejs/core/commit/c0adb67c2e10d07af74304accbc1c79d19f6c196))
- **runtime-core:** skip emit warn if has equivalent onXXX prop ([0709380](https://github.com/vuejs/core/commit/0709380c5faf0a86c25a0564781fdb2650c9c353))
### Performance Improvements
- **runtime-core:** use raw context on component options init ([bfd6744](https://github.com/vuejs/core/commit/bfd6744fb1db36a02914ef48da7116636343f313))
### BREAKING CHANGES
- **reactivity:** Reactivity APIs adjustments:
*`readonly` is now non-tracking if called on plain objects.
`lock` and `unlock` have been removed. A `readonly` proxy can no
longer be directly mutated. However, it can still wrap an already
reactive object and track changes to the source reactive object.
*`isReactive` now only returns true for proxies created by `reactive`,
or a `readonly` proxy that wraps a `reactive` proxy.
* A new utility `isProxy` is introduced, which returns true for both
- **compiler-core:** should not generate CLASS/STYLE patch flags on components ([a6e2b10](https://github.com/vuejs/core/commit/a6e2b1052a4d461767147a6c13854fcb4f9509d2)), closes [#677](https://github.com/vuejs/core/issues/677)
- **runtime-core:** should resolve value instead of delete for dynamic props with options ([c80b857](https://github.com/vuejs/core/commit/c80b857eb5b19f48f498147479a779af9953be32))
- **runtime-dom:** fix patching for attributes starting with `on` ([6eb3399](https://github.com/vuejs/core/commit/6eb339931185a57cc36ddb6e12314a5283948169)), closes [#949](https://github.com/vuejs/core/issues/949)
- **runtime-dom:** should patch svg innerHtml ([#956](https://github.com/vuejs/core/issues/956)) ([27b5c71](https://github.com/vuejs/core/commit/27b5c71944637bc04d715382851cc63ca7efc47a))
- **runtime-dom/v-on:** support event.stopImmediatePropagation on multiple listeners ([d45e475](https://github.com/vuejs/core/commit/d45e47569d366b932c0e3461afc6478b45a4602d)), closes [#916](https://github.com/vuejs/core/issues/916)
- **scheduler:** sort jobs before flushing ([78977c3](https://github.com/vuejs/core/commit/78977c399734da7c4f8d58f2ccd650533e89249f)), closes [#910](https://github.com/vuejs/core/issues/910) [/github.com/vuejs/core/issues/910#issuecomment-613097539](https://github.com//github.com/vuejs/core/issues/910/issues/issuecomment-613097539)
- **types:** UnwrapRef should bail on DOM element types ([#952](https://github.com/vuejs/core/issues/952)) ([33ccfc0](https://github.com/vuejs/core/commit/33ccfc0a8b69de13065c4b995f88722dd72a1ae9)), closes [#951](https://github.com/vuejs/core/issues/951)
### Code Refactoring
- **reactivity:** remove stale API `markReadonly` ([e8a866e](https://github.com/vuejs/core/commit/e8a866ec9945ec0464035be4c4c58d6212080a50))
- **runtime-core:** remove emit return value ([55566e8](https://github.com/vuejs/core/commit/55566e8f520eee8a07b85221174989c47c443c35))
### Features
- **reactivity:** add support for `customRef` API ([b83c580](https://github.com/vuejs/core/commit/b83c5801315e5e28ac51ecff743206e665f4d868))
- **reactivity:** add support for `toRef` API ([486dc18](https://github.com/vuejs/core/commit/486dc188fe1593448d2bfb0c3c4c3c02b2d78ea4))
- **runtime-core:** detect and warn against components made reactive ([2e06f5b](https://github.com/vuejs/core/commit/2e06f5bbe84155588dea82d90822a41dc93d0688)), closes [#962](https://github.com/vuejs/core/issues/962)
- Revert "feat(reactivity): add effect to public api (#909)" (#961) ([9e9d264](https://github.com/vuejs/core/commit/9e9d2644127a17f770f325d1f1c88b12a34c8789)), closes [#909](https://github.com/vuejs/core/issues/909) [#961](https://github.com/vuejs/core/issues/961)
### BREAKING CHANGES
- **reactivity:** `markReadonly` has been removed.
- **runtime-dom:** Only props starting with `on` followed by an uppercase
letter or a non-letter character are considered event listeners.
- **runtime-core:** this.$emit() and setupContext.emit() no longer
return values. For logic that relies on return value of listeners,
the listener should be declared as an `onXXX` prop and be called
directly. This still allows the parent component to pass in
a handler using `v-on`, since `v-on:foo` internally compiles
- **compiler:** should not condense ` ` ([8c17535](https://github.com/vuejs/core/commit/8c17535a470501f7f4ec3747cd3de25d9169c505)), closes [#945](https://github.com/vuejs/core/issues/945)
- **compiler:** should only strip leading newline directly in pre tag ([be666eb](https://github.com/vuejs/core/commit/be666ebd59027eb2fc96595c1a6054ecf62832e8))
- **compiler:** support full range of entity decoding in browser builds ([1f6e72b](https://github.com/vuejs/core/commit/1f6e72b11051561abe270fa233cf52d5aba01d6b))
- **compiler-core:** elements with dynamic keys should be forced into blocks ([d531686](https://github.com/vuejs/core/commit/d531686f9154c2ef7f1d877c275df62a8d8da2a5)), closes [#916](https://github.com/vuejs/core/issues/916)
- **reactivity:** track reactive keys in raw collection types ([5dcc645](https://github.com/vuejs/core/commit/5dcc645fc068f9a467fa31ba2d3c2a59e68a9fd7)), closes [#919](https://github.com/vuejs/core/issues/919)
- **runtime-core:** fix globalProperties in check on instance render proxy ([c28a919](https://github.com/vuejs/core/commit/c28a9196b2165e8ce274b2708d6d772024c2933a))
- **runtime-core:** set fragment root children should also update dynamicChildren ([#944](https://github.com/vuejs/core/issues/944)) ([a27e9ee](https://github.com/vuejs/core/commit/a27e9ee9aea3487ef3ef0c8a5df53227fc172886)), closes [#943](https://github.com/vuejs/core/issues/943)
- **runtime-dom:** fix getModelAssigner order in vModelCheckbox ([#926](https://github.com/vuejs/core/issues/926)) ([da1fb7a](https://github.com/vuejs/core/commit/da1fb7afef75470826501fe6e9d81e5af296fea7))
- **runtime-dom:** support native onxxx handlers ([2302dea](https://github.com/vuejs/core/commit/2302dea1624d4b964fed71e30089426212091c11)), closes [#927](https://github.com/vuejs/core/issues/927)
- **slots:** should update compiled dynamic slots ([8444078](https://github.com/vuejs/core/commit/84440780f9e45aa5b060180078b769f27757c7bd))
- **transition:** fix dynamic transition update on nested HOCs ([b8da8b2](https://github.com/vuejs/core/commit/b8da8b2dfac96558df1d038aac3bbe63bd42a8ce))
- **transition:** should ship props declarations in production ([4227831](https://github.com/vuejs/core/commit/42278317e15a202e4e1c8f7084eafa7bb13f1ade))
- **types:** accept generic Component type in h() ([c1d5928](https://github.com/vuejs/core/commit/c1d5928f3b240a4a69bcd8d88494e4fe8d2e625b)), closes [#922](https://github.com/vuejs/core/issues/922)
- **compiler:** fix pre tag whitespace handling ([7f30cb5](https://github.com/vuejs/core/commit/7f30cb577257ad5765261bbffa3cae862259fcab)), closes [#908](https://github.com/vuejs/core/issues/908)
- **compiler-core/slots:** should support on-component named slots ([a022b63](https://github.com/vuejs/core/commit/a022b63605820c97923413ee457ba1fb69a5221e))
- **compiler-sfc:** always use offset for template block sourcemaps ([#911](https://github.com/vuejs/core/issues/911)) ([db50009](https://github.com/vuejs/core/commit/db5000935306214b31e33865cd57935e80e27d41))
- **inject:** allow default value to be `undefined` ([#894](https://github.com/vuejs/core/issues/894)) ([94562da](https://github.com/vuejs/core/commit/94562daea70fde33a340bb7b57746523c3660a8e)), closes [#892](https://github.com/vuejs/core/issues/892)
- **portal:** portal should always remove its children when unmounted ([16cd8ee](https://github.com/vuejs/core/commit/16cd8eee7839cc4613f17642bf37b39f7bdf1fce))
- **reactivity:** scheduled effect should not execute if stopped ([0764c33](https://github.com/vuejs/core/commit/0764c33d3da8c06d472893a4e451e33394726a42)), closes [#910](https://github.com/vuejs/core/issues/910)
- **runtime-core:** support attr merging on child with root level comments ([e42cb54](https://github.com/vuejs/core/commit/e42cb543947d4286115b6adae6e8a5741d909f14)), closes [#904](https://github.com/vuejs/core/issues/904)
- **runtime-dom:** v-cloak should be removed after compile on the root element ([#893](https://github.com/vuejs/core/issues/893)) ([0ed147d](https://github.com/vuejs/core/commit/0ed147d33610b86af72cbadcc4b32e6069bcaf08)), closes [#890](https://github.com/vuejs/core/issues/890)
- **runtime-dom:** properly support creating customized built-in element ([b1d0b04](https://github.com/vuejs/core/commit/b1d0b046afb1e8f4640d8d80b6eeaf9f89e892f7))
- **transition:** warn only when there is more than one rendered child ([#903](https://github.com/vuejs/core/issues/903)) ([37b1dc8](https://github.com/vuejs/core/commit/37b1dc8242608b072d14fd2a5e52f5d40829ea52))
- **types:** allow use PropType with Function ([#915](https://github.com/vuejs/core/issues/915)) ([026eb72](https://github.com/vuejs/core/commit/026eb729f3d1566e95f2f4253d76c20e86d1ec9b)), closes [#748](https://github.com/vuejs/core/issues/748)
- **types:** export missing types from runtime-core ([#889](https://github.com/vuejs/core/issues/889)) ([412ec86](https://github.com/vuejs/core/commit/412ec86128fa33fa41ce435c493fd8275a785fea))
- **types/reactivity:** add generics constraint for markNonReactive ([f3b6559](https://github.com/vuejs/core/commit/f3b6559408fb42ff6dc0c67001c9c67093f2b059)), closes [#917](https://github.com/vuejs/core/issues/917)
- rename `<portal>` to `<teleport>` ([eee5095](https://github.com/vuejs/core/commit/eee50956924d7d2c916cdb8b99043da616e53af5))
- **runtime-core:** rename `createAsyncComponent` to `defineAsyncComponent` ([#888](https://github.com/vuejs/core/issues/888)) ([ebc5873](https://github.com/vuejs/core/commit/ebc587376ca1fb4bb8a20d4137332740605753c8))
### Features
- **asyncComponent:** retry support ([c01930e](https://github.com/vuejs/core/commit/c01930e60b4abf481900cdfcc2ba422890c41656))
- **compiler-core:** export `transformElement` from compiler-core ([#907](https://github.com/vuejs/core/issues/907)) ([20f4965](https://github.com/vuejs/core/commit/20f4965b45d410a2fe95310ecf7293b2b7f46f36))
- **compiler-core:** support v-is ([b8ffbff](https://github.com/vuejs/core/commit/b8ffbffaf771c259848743cf4eb1a5ea31795aaa))
- **portal:** hydration support for portal disabled mode ([b74bab2](https://github.com/vuejs/core/commit/b74bab216c3be68ab046451cf5e5b5bec5f19483))
- **portal:** SSR support for multi portal shared target ([e866434](https://github.com/vuejs/core/commit/e866434f0c54498dd0fc47d48287a1d0ada36388))
- **portal:** SSR support for portal disabled prop ([9ed9bf3](https://github.com/vuejs/core/commit/9ed9bf3687a770aebc265839065832761e6bafa1))
- **portal:** support disabled prop ([8ce3da0](https://github.com/vuejs/core/commit/8ce3da0104db9bdd89929724c6d841ac3dfb7336))
- **portal:** support multiple portal appending to same target ([aafb880](https://github.com/vuejs/core/commit/aafb880a0a9e023b62cf8fb3ae269b31f22ac84e))
- **reactivity:** add effect to public api ([#909](https://github.com/vuejs/core/issues/909)) ([6fba241](https://github.com/vuejs/core/commit/6fba2418507d9c65891e8d14bd63736adb377556))
- **runtime-core:** config.performance tracing support ([e93e426](https://github.com/vuejs/core/commit/e93e426bfad13f40c8f1d80b8f45ac5d0926c2fc))
- **runtime-core:** emits validation and warnings ([c7c3a6a](https://github.com/vuejs/core/commit/c7c3a6a3bef6275be8f9f8873358421017bb5386))
- **runtime-core:** failed component resolution should fallback to native element ([cb31eb4](https://github.com/vuejs/core/commit/cb31eb4d0a0afdd2abf9e3897d9aac447dd0264b))
- **runtime-core:** support app.config.globalProperties ([27873db](https://github.com/vuejs/core/commit/27873dbe1c09ac6a058d815949a4e13831513fd0))
- **runtime-core:** type and attr fallthrough support for emits option ([bf473a6](https://github.com/vuejs/core/commit/bf473a64eacab21d734d556c66cc190aa4ff902d))
- **templateRef:** should work with direct reactive property ([449ab03](https://github.com/vuejs/core/commit/449ab039feb10df7179898b13ecc45028a043002)), closes [#901](https://github.com/vuejs/core/issues/901)
- **templateRef:** support template ref for all vnode types ([55b364d](https://github.com/vuejs/core/commit/55b364decc903a6c7fccd1cdcdcfc79948c848a2))
### BREAKING CHANGES
- **runtime-core:** attribute fallthrough behavior has been adjusted
according to https://github.com/vuejs/rfcs/pull/154
-`<portal>` has been renamed to `<teleport>`.
`target` prop is also renamed to `to`, so the new usage will be:
```html
<Teleportto="#modal-layer":disabled="isMobile">
<divclass="modal">hello</div>
</Teleport>
```
The primary reason for the renaming is to avoid potential naming
conflict with [native portals](https://wicg.github.io/portals/).
- **asyncComponent:** async component `error` and `loading` options have been
renamed to `errorComponent` and `loadingComponent` respectively.
- **runtime-core:** `createAsyncComponent` has been renamed to `defineAsyncComponent` for consistency with `defineComponent`.
- fix option merge global mixins presence check ([10ad965](https://github.com/vuejs/core/commit/10ad965100a88e28cb528690f2e09070fefc8872))
- **compiler-core:** assign patchFlag for template v-if fragment ([a1da9c2](https://github.com/vuejs/core/commit/a1da9c28a0a7030124b1deb9369685760c67be47)), closes [#850](https://github.com/vuejs/core/issues/850)
- **compiler-core:** support interpolation in RCDATA mode (e.g. textarea) ([0831b98](https://github.com/vuejs/core/commit/0831b98eac344d9bdfd6f6e922902adb91ea180a))
- **keep-alive:** should update re-activated component with latest props ([1237387](https://github.com/vuejs/core/commit/123738727a0af54fd632bf838dc3aa024722ee41))
- **reactivity:** should not observe frozen objects ([1b2149d](https://github.com/vuejs/core/commit/1b2149dbb2dd224d01e90c1a9332bfe67aa465ce)), closes [#867](https://github.com/vuejs/core/issues/867)
- **reactivity:** should not trigger map keys iteration when keys did not change ([45ba06a](https://github.com/vuejs/core/commit/45ba06ac5f49876b4f05e5996f595b2c4a761f47)), closes [#877](https://github.com/vuejs/core/issues/877)
- **runtime-dom:** invalid lineGradient svg tag ([#863](https://github.com/vuejs/core/issues/863)) ([d425818](https://github.com/vuejs/core/commit/d425818901428ff919a0179fc910410cbcfa119b)), closes [#862](https://github.com/vuejs/core/issues/862)
- **TransitionGroup:** ignore comment node when warn (fix[#869](https://github.com/vuejs/core/issues/869)) ([#875](https://github.com/vuejs/core/issues/875)) ([0dba5d4](https://github.com/vuejs/core/commit/0dba5d44e60d33b909f4e4d05663c7ddf746a1f2))
- do not drop SFC runtime behavior code in global builds ([4c1a193](https://github.com/vuejs/core/commit/4c1a193617bee8ace6fad289b78e9d2557cb081e)), closes [#873](https://github.com/vuejs/core/issues/873)
- dynamic component fallback to native element ([f529dbd](https://github.com/vuejs/core/commit/f529dbde236e9eaedbded78e926951a189234f9c)), closes [#870](https://github.com/vuejs/core/issues/870)
- **asyncComponent:** SSR/hydration support for async component ([cba2f1a](https://github.com/vuejs/core/commit/cba2f1aadbd0d4ae246040ecd5a91d8dd4e8fd1a))
- **runtime-core:** async component support ([c3bb316](https://github.com/vuejs/core/commit/c3bb3169f497fc834654d8ae700f18b1a6613127))
- **runtime-core:** support `config.optionMergeStrategies` ([528621b](https://github.com/vuejs/core/commit/528621ba41b1d7113940077574217d01d182b35f))
- add hook for transforming h's arguments ([#851](https://github.com/vuejs/core/issues/851)) ([b7d1e0f](https://github.com/vuejs/core/commit/b7d1e0fa2ffe4561a589580eca6e92171c311347))
### Performance Improvements
- **transform-vif:** don't need to createBlock for a component ([#853](https://github.com/vuejs/core/issues/853)) ([a3601e9](https://github.com/vuejs/core/commit/a3601e9fa73d10f524ed3bdf3ae44df8847c1230))
- **compiler-ssr:** should pass necessary tag names for dynamic v-bind ([a46f3b3](https://github.com/vuejs/core/commit/a46f3b354d451a857df750a318bd0536338008cd))
- **runtime-core:** always set invalid vnode type ([#820](https://github.com/vuejs/core/issues/820)) ([28a9bee](https://github.com/vuejs/core/commit/28a9beed1624de9812e0f4ce9b63f7f3ed2c6db8))
- simplify and use correct ctx in withCtx ([4dc8ffc](https://github.com/vuejs/core/commit/4dc8ffc3788c38aff3e4c0f271d0ca111f723140))
- **runtime-core:** pass prev value to hostPatchProp ([#809](https://github.com/vuejs/core/issues/809)) ([cd34603](https://github.com/vuejs/core/commit/cd34603864142d5468486ec3f379679b22014a1b)), closes [#808](https://github.com/vuejs/core/issues/808)
- **runtime-core:** should allow empty string and 0 as valid vnode key ([#807](https://github.com/vuejs/core/issues/807)) ([54a0e93](https://github.com/vuejs/core/commit/54a0e93c276f95a35b3bd6510a7f52d967fd3b7f))
- **types:** app.component should accept defineComponent return type ([#822](https://github.com/vuejs/core/issues/822)) ([1e9d131](https://github.com/vuejs/core/commit/1e9d1319c3f66a0a7430a4f6ac7b508486894b6b)), closes [#730](https://github.com/vuejs/core/issues/730)
### Code Refactoring
- **runtime-core:** adjust patchProp value arguments order ([ca5f39e](https://github.com/vuejs/core/commit/ca5f39ee3501a1d9cacdb74108318c15ee7c0abb))
### Features
- **compiler-core:** wrap slot functions with render context ([ecd7ce6](https://github.com/vuejs/core/commit/ecd7ce60d5234a7a0dbc11add6a690c3f9ff0617))
- **compiler-sfc:** add ssr option ([3b2d236](https://github.com/vuejs/core/commit/3b2d23671409f8ac358252311bf5212882fa985a))
- **runtime-core:** add special property to get class component options ([#821](https://github.com/vuejs/core/issues/821)) ([dd17fa1](https://github.com/vuejs/core/commit/dd17fa1c9071b9685c379e1b12102214b757cf35))
- **runtime-core:** set context for manual slot functions as well ([8a58dce](https://github.com/vuejs/core/commit/8a58dce6034944b18c2e507b5d9ab8177f60e269))
- **server-renderer:** render suspense in vnode mode ([#727](https://github.com/vuejs/core/issues/727)) ([589aeb4](https://github.com/vuejs/core/commit/589aeb402c58f463cc32d5e7728b56614bc9bf33))
- **ssr:** compiler-ssr support for Suspense ([80c625d](https://github.com/vuejs/core/commit/80c625dce33610e53c953e9fb8fde26e3e10e358))
- **ssr:** hide comment anchors during hydration in dev mode ([cad5bcc](https://github.com/vuejs/core/commit/cad5bcce40b9f2aaa520ccbd377cd5419650e55f))
- **ssr:** improve fragment mismatch handling ([60ed4e7](https://github.com/vuejs/core/commit/60ed4e7e0821a2932660b87fbf8d5ca953e0e073))
- **ssr:** support getSSRProps for vnode directives ([c450ede](https://github.com/vuejs/core/commit/c450ede12d1a93a70271a2fe7fcb6f8efcf1cd4c))
- **reactivity:** Map/Set identity methods should work even if raw value contains reactive entries ([cc69fd7](https://github.com/vuejs/core/commit/cc69fd72e3f9ef3572d2be40af71d22232e1b9af)), closes [#799](https://github.com/vuejs/core/issues/799)
- **reactivity:** should not trigger length dependency on Array delete ([a306658](https://github.com/vuejs/core/commit/a3066581f3014aae31f2d96b96428100f1674166)), closes [#774](https://github.com/vuejs/core/issues/774)
- **runtime-core:** revert setup() result reactive conversion ([e67f655](https://github.com/vuejs/core/commit/e67f655b2687042fcc74dc0993581405abed56de))
### Features
- **compiler-core:** switch to @babel/parser for expression parsing ([8449a97](https://github.com/vuejs/core/commit/8449a9727c942b6049c9e577c7c15b43fdca2867))
- **renderSlot:** set slot render as a STABLE_FRAGMENT ([#776](https://github.com/vuejs/core/issues/776)) ([8cb0b83](https://github.com/vuejs/core/commit/8cb0b8308801159177ec16ab5a3e23672c4c1d00)), closes [#766](https://github.com/vuejs/core/issues/766)
- **runtime-core:** make watchEffect ignore deep option ([#765](https://github.com/vuejs/core/issues/765)) ([19a799c](https://github.com/vuejs/core/commit/19a799c28b149b14e85d9e2081fa65ed58d108ba))
- **runtime-core:** set appContext.provides to Object.create(null) ([#781](https://github.com/vuejs/core/issues/781)) ([04f83fa](https://github.com/vuejs/core/commit/04f83fa6810e07915e98b94c954ff0c1859aaa49))
- **types:** ref value type unwrapping should happen at creation time ([d4c6957](https://github.com/vuejs/core/commit/d4c6957e2d8ac7920a649f3a3576689cd5e1099f))
- **types:** shallowRef should not unwrap value type ([3206e5d](https://github.com/vuejs/core/commit/3206e5dfe58fd0e93644d13929558d71c5171888))
- **compiler-core:** should alias name in helperString ([#743](https://github.com/vuejs/core/issues/743)) ([7b987d9](https://github.com/vuejs/core/commit/7b987d9450fc7befcd0946a0d53991d27ed299ec)), closes [#740](https://github.com/vuejs/core/issues/740)
- **reactivity:** should trigger all effects when array length is mutated ([#754](https://github.com/vuejs/core/issues/754)) ([5fac655](https://github.com/vuejs/core/commit/5fac65589b4455b98fd4e2f9eb3754f0acde97bb))
- **sfc:** inherit parent scopeId on child root ([#756](https://github.com/vuejs/core/issues/756)) ([9547c2b](https://github.com/vuejs/core/commit/9547c2b93d6d8f469314cfe055960746a3e3acbe))
- **types:** improve ref typing, close [#759](https://github.com/vuejs/core/issues/759) ([627b9df](https://github.com/vuejs/core/commit/627b9df4a293ae18071009d9cac7a5e995d40716))
- **reactivity:** only trigger all effects on Array length mutation if new length is shorter than old length ([33622d6](https://github.com/vuejs/core/commit/33622d63600ba0f18ba4dae97bda882c918b5f7d))
### BREAKING CHANGES
- **runtime-core:** replace `watch(fn, options?)` with `watchEffect`
The `watch(fn, options?)` signature has been replaced by the new
`watchEffect` API, which has the same usage and behavior. `watch`
now only supports the `watch(source, cb, options?)` signature.
- **reactivity:** reactive arrays no longer unwraps contained refs
When reactive arrays contain refs, especially a mix of refs and
plain values, Array prototype methods will fail to function
properly - e.g. sort() or reverse() will overwrite the ref's value
instead of moving it (see #737).
Ensuring correct behavior for all possible Array methods while
retaining the ref unwrapping behavior is exceedingly complicated; In
addition, even if Vue handles the built-in methods internally, it
would still break when the user attempts to use a 3rd party utility
function (e.g. lodash) on a reactive array containing refs.
After this commit, similar to other collection types like Map and
Set, Arrays will no longer automatically unwrap contained refs.
The usage of mixed refs and plain values in Arrays should be rare in
practice. In cases where this is necessary, the user can create a
- **compiler:** fix v-for fragment openBlock argument ([12fcf9a](https://github.com/vuejs/core/commit/12fcf9ab953acdbb8706b549c7e63f69482a495a))
- **compiler-core:** fix keep-alive when used in templates ([ade07c6](https://github.com/vuejs/core/commit/ade07c64a1f98c0958e80db0458c699c21998f64)), closes [#715](https://github.com/vuejs/core/issues/715)
- **compiler-core:** only check is prop on `<component>` ([78c4f32](https://github.com/vuejs/core/commit/78c4f321cd0902a117c599ac705dda294fa198ed))
- **compiler-core:** relax error on unknown entities ([730d329](https://github.com/vuejs/core/commit/730d329f794caf1ea2cc47628f8d74ef2d07f96e)), closes [#663](https://github.com/vuejs/core/issues/663)
- **compiler-core:** should apply text transform to if branches ([e0f3c6b](https://github.com/vuejs/core/commit/e0f3c6b352ab35adcad779ef0ac9670acf3d7b37)), closes [#725](https://github.com/vuejs/core/issues/725)
- **compiler-core:** should not hoist element with cached + merged event handlers ([5455e8e](https://github.com/vuejs/core/commit/5455e8e69a59cd1ff72330b1aed9c8e6aedc4b36))
- **compiler-sfc:** handle empty nodes with src attribute ([#695](https://github.com/vuejs/core/issues/695)) ([2d56dfd](https://github.com/vuejs/core/commit/2d56dfdc4fcf824bba4c0166ca5471258c4f883b))
- **compiler-ssr:** import helpers from correct packages ([8f6b669](https://github.com/vuejs/core/commit/8f6b6690a2011846446804267ec49073996c3800))
- **computed:** support arrow function usage for computed option ([2fb7a63](https://github.com/vuejs/core/commit/2fb7a63943d9d995248cb6d2d4fb5f22ff2ac000)), closes [#733](https://github.com/vuejs/core/issues/733)
- **reactivity:** avoid cross-component dependency leaks in setup() ([d9d63f2](https://github.com/vuejs/core/commit/d9d63f21b1e6f99f2fb63d736501095b131e5ad9))
- **reactivity:** effect should handle self dependency mutations ([e8e6772](https://github.com/vuejs/core/commit/e8e67729cb7649d736be233b2a5e00768dd6f4ba))
- **reactivity:** trigger iteration effect on Map.set ([e1c9153](https://github.com/vuejs/core/commit/e1c9153b9ed71f9b2e1ad4f9018c51d239e7dcd0)), closes [#709](https://github.com/vuejs/core/issues/709)
- **runtime-core:** fix ShapeFlags tree shaking ([0f67aa7](https://github.com/vuejs/core/commit/0f67aa7da50d6ffc543754a42f1e677af11f9173))
- **runtime-core:** handle component updates with only class/style bindings ([35d91f4](https://github.com/vuejs/core/commit/35d91f4e18ccb72cbf39a86fe8f39060f0bf075e))
- **runtime-core:** render context set should not unwrap reactive values ([27fbfbd](https://github.com/vuejs/core/commit/27fbfbdb8beffc96134c931425f33178c23a72db))
- **runtime-core:** should not return early on text patchFlag ([778f3a5](https://github.com/vuejs/core/commit/778f3a5e886a1a1136bc8b00b849370d7c4041be))
- **runtime-core/scheduler:** avoid duplicate updates of child component ([8a87074](https://github.com/vuejs/core/commit/8a87074df013fdbb0e88f34074c2605e4af2937c))
- **runtime-core/watch:** trigger watcher with undefined as initial value ([#687](https://github.com/vuejs/core/issues/687)) ([5742a0b](https://github.com/vuejs/core/commit/5742a0b826fe77d2310acb530667adb758822f66)), closes [#683](https://github.com/vuejs/core/issues/683)
- **runtime-dom/ssr:** properly handle xlink and boolean attributes ([e6e2c58](https://github.com/vuejs/core/commit/e6e2c58234cab46fa530c383c0f7ae1cb3494da3))
- **ssr:** avoid hard-coded ssr checks in cjs builds ([bc07e95](https://github.com/vuejs/core/commit/bc07e95ca84686bfa43798a444a3220581b183d8))
- **ssr:** fix class/style rendering + ssrRenderComponent export name ([688ad92](https://github.com/vuejs/core/commit/688ad9239105625f7b63ac43181dfb2e9d1d4720))
- **ssr:** render components returning render function from setup ([#720](https://github.com/vuejs/core/issues/720)) ([4669215](https://github.com/vuejs/core/commit/4669215ca2f82d90a1bd730613259f3167e199cd))
- **types:** app.component should accept defineComponent return type ([57ee5df](https://github.com/vuejs/core/commit/57ee5df364f03816e548f4f3bf05edc7a089c362)), closes [#730](https://github.com/vuejs/core/issues/730)
- **types:** ensure correct oldValue typing based on lazy option ([c6a9787](https://github.com/vuejs/core/commit/c6a9787941ca99877d268182a5bb57fcf8b80b75)), closes [#719](https://github.com/vuejs/core/issues/719)
- **v-on:** transform click.right and click.middle modifiers ([028f748](https://github.com/vuejs/core/commit/028f748c32f80842be39897fdacc37f6700f00a7)), closes [#735](https://github.com/vuejs/core/issues/735)
- remove effect from public API ([4bc4cb9](https://github.com/vuejs/core/commit/4bc4cb970f7a65177948c5d817bb43ecb0324636)), closes [#712](https://github.com/vuejs/core/issues/712)
- **v-model:** should use dynamic directive on input with dynamic v-bind ([1f2de9e](https://github.com/vuejs/core/commit/1f2de9e232409b09c97b67d0824d1450beed6eb1))
### Code Refactoring
- **watch:** adjust watch API behavior ([9571ede](https://github.com/vuejs/core/commit/9571ede84bb6949e13c25807cc8f016ace29dc8a))
### Features
- **compiler:** mark hoisted trees with patchFlag ([175f8aa](https://github.com/vuejs/core/commit/175f8aae8d009e044e3674f7647bf1397f3a794a))
- **compiler:** warn invalid children for transition and keep-alive ([4cc39e1](https://github.com/vuejs/core/commit/4cc39e14a297f42230f5aac5ec08e3c98902b98d))
- **compiler-core:** support mode: cjs in codegen ([04da2a8](https://github.com/vuejs/core/commit/04da2a82e8fbde2b60b2392bc4bdcc5e61113202))
- **compiler-core/v-on:** support [@vnode-xxx](https://github.com/vnode-xxx) usage for vnode hooks ([571ed42](https://github.com/vuejs/core/commit/571ed4226be618dcc9f95e4c2da8d82d7d2f7750))
- **compiler-dom:** handle constant expressions when stringifying static content ([8b7c162](https://github.com/vuejs/core/commit/8b7c162125cb72068727a76ede8afa2896251db0))
- **compiler-dom/runtime-dom:** stringify eligible static trees ([27913e6](https://github.com/vuejs/core/commit/27913e661ac551f580bd5fd42b49fe55cbe8dbb8))
- **reactivity:** add shallowReactive function ([#689](https://github.com/vuejs/core/issues/689)) ([7f38c1e](https://github.com/vuejs/core/commit/7f38c1e0ff5a7591f67ed21aa3a2944db2e72a27))
- **reactivity:** Array methods relying on identity should work with raw values ([aefb7d2](https://github.com/vuejs/core/commit/aefb7d282ed716923ca1a288a63a83a94af87ebc))
- **runtime-core:** instance should not expose non-declared props ([2884831](https://github.com/vuejs/core/commit/2884831065e16ccf5bd3ae1ee95116803ee3b18c))
- **runtime-dom:** should not access document in non-browser env ([48152bc](https://github.com/vuejs/core/commit/48152bc88ea817ae23e2987dce99d64b426366c1)), closes [#657](https://github.com/vuejs/core/issues/657)
- **v-model/emit:** update:camelCase events should trigger kebab case equivalent ([2837ce8](https://github.com/vuejs/core/commit/2837ce842856d51dfbb55e3fa4a36a352446fb54)), closes [#656](https://github.com/vuejs/core/issues/656)
### Code Refactoring
- adjust `createApp` related API signatures ([c07751f](https://github.com/vuejs/core/commit/c07751fd3605f301dc0f02fd2a48acc7ba7a0397))
- remove implicit reactive() call on renderContext ([6b10f0c](https://github.com/vuejs/core/commit/6b10f0cd1da942c1d96746672b5f595df7d125b5))
- Suspense should include into dynamic children ([#653](https://github.com/vuejs/core/issues/653)) ([ec63623](https://github.com/vuejs/core/commit/ec63623fe8d395e1cd759f27b90b1ccc1b616931)), closes [#649](https://github.com/vuejs/core/issues/649)
- **compiler-core:** avoid override user keys when injecting branch key ([#630](https://github.com/vuejs/core/issues/630)) ([aca2c2a](https://github.com/vuejs/core/commit/aca2c2a81e2793befce516378a02afd1e4da3d3d))
- **compiler-core:** force `<svg>` into blocks for correct runtime isSVG ([f2ac28b](https://github.com/vuejs/core/commit/f2ac28b31e9f1e8ebcd68ca9a1e8ea29653b0916))
- **compiler-sfc:** only transform relative asset URLs ([#628](https://github.com/vuejs/core/issues/628)) ([c71ca35](https://github.com/vuejs/core/commit/c71ca354b9368135b55676c5817cebffaf3fd9c5))
- **dom:** fix `<svg>` and `<foreignObject>` mount and updates ([4f06eeb](https://github.com/vuejs/core/commit/4f06eebc1c2a29d0e4165c6e87f849732ec2cd0f))
- **runtime-core:** condition for parent node check should be any different nodes ([c35fea3](https://github.com/vuejs/core/commit/c35fea3d608acbb571ace6693284061e1cadf7ba)), closes [#622](https://github.com/vuejs/core/issues/622)
- **runtime-core:** isSVG check should also apply for patch branch ([035b656](https://github.com/vuejs/core/commit/035b6560f7eb64ce940ed0d06e19086ad9a3890f)), closes [#639](https://github.com/vuejs/core/issues/639)
- **runtime-core:** should not warn unused attrs when accessed via setup context ([751d838](https://github.com/vuejs/core/commit/751d838fb963e580a40df2d84840ba2198480185)), closes [#625](https://github.com/vuejs/core/issues/625)
- **runtime-core:** emit now returns array of return values from all triggered handlers ([e81c8a3](https://github.com/vuejs/core/commit/e81c8a32c7b66211cbaecffa93efd4629ec45ad9)), closes [#635](https://github.com/vuejs/core/issues/635)
- **runtime-core:** support app.unmount(container) ([#601](https://github.com/vuejs/core/issues/601)) ([04ac6c4](https://github.com/vuejs/core/commit/04ac6c467a4122877c204d7494c86f89498d2dc6)), closes [#593](https://github.com/vuejs/core/issues/593)
- **compiler/v-slot:** handle implicit default slot mixed with named slots ([2ac4b72](https://github.com/vuejs/core/commit/2ac4b723e010082488b5be64af73e41c9677a28d))
- **reactivity:** should delete observe value ([#598](https://github.com/vuejs/core/issues/598)) ([63a6563](https://github.com/vuejs/core/commit/63a656310676e3927b2e57d813fd6300c0a42590)), closes [#597](https://github.com/vuejs/core/issues/597)
- **runtime-core:** allow classes to be passed as plugins ([#588](https://github.com/vuejs/core/issues/588)) ([8f616a8](https://github.com/vuejs/core/commit/8f616a89c580bc211540d5e4d60488ff24d024cc))
- **runtime-core:** should preserve props casing when component has no declared props ([bb6a346](https://github.com/vuejs/core/commit/bb6a346996ce0bf05596c605ba5ddbe0743ef84b)), closes [#583](https://github.com/vuejs/core/issues/583)
- **runtime-core/vnode:** should not render boolean values in vnode children (close [#574](https://github.com/vuejs/core/issues/574)) ([84dc5a6](https://github.com/vuejs/core/commit/84dc5a686275528733977ea1570e0a892ba3e177))
- **types:** components options should accept components defined with defineComponent ([#602](https://github.com/vuejs/core/issues/602)) ([74baea1](https://github.com/vuejs/core/commit/74baea108aa93377c4959f9a6b8bc8f9548700ba))
- **watch:** remove recorded effect on manual stop ([#590](https://github.com/vuejs/core/issues/590)) ([453e688](https://github.com/vuejs/core/commit/453e6889da22e7224b638261a32438bdf5c62e41))
- **runtime-core:** pass options to plugins ([#561](https://github.com/vuejs/core/issues/561)) ([4d20981](https://github.com/vuejs/core/commit/4d20981eb069b20e1627916b977aedb2d68eca86))
- **sfc:** treat custom block content as raw text ([d6275a3](https://github.com/vuejs/core/commit/d6275a3c310e6e9426f897afe35ff6cdb125c023))
- mounting new children ([7d436ab](https://github.com/vuejs/core/commit/7d436ab59a30562a049e199ae579df7ac8066829))
- **core:** clone mounted hoisted vnodes on patch ([47a6a84](https://github.com/vuejs/core/commit/47a6a846311203fa59584486265f5da387afa51d))
- **fragment:** perform direct remove when removing fragments ([2fdb499](https://github.com/vuejs/core/commit/2fdb499bd96b4d1a8a7a1964d59e8dc5dacd9d22))
For changes between 2.x and 3.0 up to this release, please refer to merged RFCs [here](https://github.com/vuejs/rfcs/pulls?q=is%3Apr+is%3Amerged+label%3A3.x).
