v2.7.10

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Bug Fixes

• compiler-sfc: avoid deindent when lang is jsx/tsx (46ca7bc), closes #​12755
• fix parent of multi-nested HOC $el not updating (#​12757) (e0b26c4), closes #​12589
• types: Add missing type parameter constraints (#​12754) (810f6d1)

v2.7.9

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Bug Fixes

• compiler-sfc: allow full hostnames in asset url base (#​12732) (5c742eb), closes #​12731
• compiler-sfc: rewriteDefault for class with decorators (#​12747) (5221d4d)
• directives shorthand normalize error (#​12744) (2263948), closes #​12743
• ensure render watcher of manually created instance is correctly tracked in owner scope (bd89ce5), closes #​12701
• fix effect scope tracking for manually created instances (7161176), closes #​12705
• ssr: fix on-component directives rendering (#​12661) (165a14a), closes #​10733
• types: allow attaching unknown options to defined component (b4bf4c5), closes #​12742
• types: fix missing error for accessing undefined instance properties (8521f9d), closes #​12718
• types: fix options suggestions when using defineComponent (4b37b56), closes #​12736
• types: Make SetupBindings optional on ExtendedVue and CombinedVueInstance (#​12727) (00458cd), closes #​12726 #​12717
• watch: avoid pre watcher firing on unmount (f0057b1), closes #​12703

Features

• types: enhance type for onErrorCaptured (#​12735) (bba6b3d)
• types: export DefineComponent (80d1baf), closes #​12748
• types: support mixins inference for new Vue() (#​12737) (89a6b5e), closes #​12730

v2.7.8

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Bug Fixes

• reactivity: fix shallowReactive nested ref setting edge cases (2af751b), closes #​12688
• sfc: align <script setup> component resolution edge case with v3 (#​12687) (a695c5a), closes #​12685
• types: avoid circular type inference between v2 and v3 instance types (fabc1cf), closes #​12683
• types: export defineAsyncComponent type (#​12684) (ba7dd2c)

Features

• setup: support listeners on setup context + useListeners() helper (adf3ac8)

v2.7.7

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Bug Fixes

• codegen: script setup should not attempt to resolve native elements as component (e8d3a7d), closes #​12674
• inject: fix edge case of provided with async-mutated getters (ea5d0f3), closes #​12667
• setup: ensure setup context slots can be accessed immediately (67760f8), closes #​12672
• types: vue.d.ts should use relative import to v3-component-public-instance (#​12668) (46ec648), closes #​12666
• watch: fix queueing multiple post watchers (25ffdb6), closes #​12664

v2.7.6

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Bug Fixes

• types: $refs can also contain ComponentPublicInstance (#​12659) (fffbb9e)
• types: fix $children and $root instance types (52a5979), closes #​12655
• types: fix missing expose() type on setup context (e0a9546), closes #​12660

v2.7.5

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Bug Fixes

• add missing export from vue.runtime.mjs (#​12648) (08fb4a2)
• detect property add/deletion on reactive objects from setup when used in templates (a6e7498)
• do not set currentInstance in beforeCreate (0825d30), closes #​12636
• reactivity: fix watch behavior inconsistency + deep ref shallow check (98fb01c), closes #​12643
• sfc: fix sfc name inference type check (04b4703), closes #​12637
• types: support Vue interface augmentations in defineComponent (005e52d), closes #​12642
• watch: fix deep watch for structures containing raw refs (1a2c3c2), closes #​12652

v2.7.4

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Bug Fixes

• build: fix mjs dual package hazard (012e10c), closes #​12626
• compiler-sfc: use safer deindent default for compatibility with previous behavior (b70a258)
• pass element creation helper to static render fns for functional components (dc8a68e), closes #​12625
• ssr/reactivity: fix array setting error at created in ssr [#​12632] (#​12633) (ca7daef)
• types: fix missing instance properties on defineComponent this (f8de4ca), closes #​12628
• types: fix this.$slots type for defineComponent (d3add06)
• types: fix type inference when using components option (1d5a411)
• types: global component registration type compat w/ defineComponent (26ff4bc), closes #​12622
• watch: fix watchers triggered in mounted hook (8904ca7), closes #​12624

Features

• defineAsyncComponent (9d12106), closes #​12608
• support functional components in defineComponent (559600f), closes #​12619

v2.7.3

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Bug Fixes

• add renderTracked/Triggered merge strategy (#​12616) (6d1dbee)
• ssr/reactivity: fix composition api behavior in SSR (360272b), closes #​12615
• types: allow slot attribute (94ccca2), closes #​12617

v2.7.2

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Bug Fixes

• compiler-sfc: preserve old deindent behavior for pug (1294385), closes #​12611

Features

• allow passing directive definition directly to h() (#​12590) (d45bbea)
• types: define component improvements (#​12612) (fb93c1b)

v2.7.1

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Bug Fixes

• compiler-sfc: avoid deindent when lang is jsx/tsx (46ca7bc), closes #​12755
• fix parent of multi-nested HOC $el not updating (#​12757) (e0b26c4), closes #​12589
• types: Add missing type parameter constraints (#​12754) (810f6d1)

v2.7.0

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Backported Features

• Composition API
• SFC <script setup>
• SFC CSS v-bind

In addition, the following APIs are also supported:

• defineComponent() with improved type inference (compared to Vue.extend)

• h(), useSlot(), useAttrs(), useCssModules()

• set(), del() and nextTick() are also provided as named exports in ESM builds.

• The emits option is also supported, but only for type-checking purposes (does not affect runtime behavior)

  2.7 also supports using ESNext syntax in template expressions. When using a build system, the compiled template render function will go through the same loaders / plugins configured for normal JavaScript. This means if you have configured Babel for .js files, it will also apply to the expressions in your SFC templates.

Notes on API exposure

• In ESM builds, these APIs are provided as named exports (and named exports only):

  import Vue, { ref } from 'vue'
  Vue.ref // undefined, use named export instead

• In UMD and CJS builds, these APIs are exposed as properties on the global Vue object.

• When bundling with CJS builds externalized, bundlers should be able to handle ESM interop when externalizing CJS builds.

Behavior Differences from Vue 3

The Composition API is backported using Vue 2's getter/setter-based reactivity system to ensure browser compatibility. This means there are some important behavior differences from Vue 3's proxy-based system:

• All Vue 2 change detection caveats still apply.

• reactive(), ref(), and shallowReactive() will directly convert original objects instead of creating proxies. This means:

  // true in 2.7, false in 3.x
  reactive(foo) === foo

• readonly() does create a separate object, but it won't track newly added properties and does not work on arrays.

• Avoid using arrays as root values in reactive() because without property access the array's mutation won't be tracked (this will result in a warning).

• Reactivity APIs ignore properties with symbol keys.

In addition, the following features are explicitly NOT ported:

• ❌ createApp() (Vue 2 doesn't have isolated app scope)
• ❌ Top-level await in <script setup> (Vue 2 does not support async component initialization)
• ❌ TypeScript syntax in template expressions (incompatible w/ Vue 2 parser)
• ❌ Reactivity transform (still experimental)
• ❌ expose option is not supported for options components (but defineExpose() is supported in <script setup>).

TypeScript Changes

• defineComponent provides improved type inference similar to that of Vue 3. Note the type of this inside defineComponent() is not interoperable with this from Vue.extend().

• Similar to Vue 3, TSX support is now built-in. If your project previously had manual JSX type shims, make sure to remove them.

Upgrade Guide

Vue CLI / webpack

1. Upgrade local @vue/cli-xxx dependencies the latest version in your major version range (if applicable):

   • ~4.5.18 for v4
   • ~5.0.6 for v5

2. Upgrade vue to ^2.7.0. You can also remove vue-template-compiler from the dependencies - it is no longer needed in 2.7.

   Note: if you are using @vue/test-utils, you may need to keep it in the dependencies for now, but this requirement will also be lifted in a new release of test utils.

3. Check your package manager lockfile to ensure the following dependencies meet the version requirements. They may be transitive dependencies not listed in package.json.

   • vue-loader: ^15.10.0
   • vue-demi: ^0.13.1

   If not, you will need to remove node_modules and the lockfile and perform a fresh install to ensure they are bumped to the latest version.

4. If you were previously using @vue/composition-api, update imports from it to vue instead. Note that some APIs exported by the plugin, e.g. createApp, are not ported in 2.7.

5. Update eslint-plugin-vue to latest version (9+) if you run into unused variable lint errors when using <script setup>.

6. The SFC compiler for 2.7 now uses PostCSS 8 (upgraded from 7). PostCSS 8 should be backwards compatible with most plugins, but the upgrade may cause issues if you were previously using a custom PostCSS plugin that can only work with PostCSS 7. In such cases, you will need to upgrade the relevant plugins to their PostCSS 8 compatible versions.

Vite

2.7 support for Vite is provided via a new plugin: @​vitejs/plugin-vue2. This new plugin requires Vue 2.7 or above and supersedes the existing vite-plugin-vue2.

Note that the new plugin does not handle Vue-specific JSX / TSX transform, which is intentional. Vue 2 JSX / TSX transform should be handled in a separate, dedicated plugin, which will be provided soon.

Volar Compatibility

2.7 ships improved type definitions so it is no longer necessary to install @vue/runtime-dom just for Volar template type inference support. All you need now is the following config in tsconfig.json:

{
 // ...
 "vueCompilerOptions": {
 "target": 2.7
 }
}

Devtools Support

Vue Devtools 6.2.0 has added support for inspecting 2.7 Composition API state, but the extensions may still need a few days to go through review on respective publishing platforms.

Bug Fixes

• sfc: only include legacy decorator parser plugin when new plugin is not used (326d24a)