v2.5.0 Level E

Features & Improvements

Error Handling and Reporting

• improve error handling with new errorCaptured hook b3cd9bc [Details]
• improve template expression error message e38d006, closes #6771
• improve option type checks b7105ae

TypeScript Declaration Improvements

• further improve Vue type declarations for canonical usage (#6391) db138e2

  This change requires upgrade actions for TypeScript users using 2.4 types. Thanks to the work by @DanielRosenwasser, @HerringtonDarkholme and @ktsn. For more details, please read this blog post.

Functional Components

• compiled templates for functional component support ea0d227

• scoped CSS support for functional components 050bb33

  These features require vue-loader>=13.3.0. Thanks to the work by @blake-newman. [Details]

Server Side Rendering

• renderToString now returns a Promise if no callback is passed f881dd1, closes #6160
• add shouldPrefetch option (same signature as shouldPreload) 7bc899c, closes #5964
• auto-remove initial state embed script if in production (#6763) 2d32b5d, closes #6761
• now ships an environment-agnostic build of the server renderer in vue-server-renderer/basic.js c5d0fa0 [Details]

v-model

• support dynamic type binding on <input> f3fe012
• now creates non-existent properties as reactive (non-recursive) e1da0d5, closes #5932 (See reasoning behind this change)

v-on

• automatic key modifier inference 4987eeb [Details]
• add .exact event modifier (#5977) 9734e87, closes #5976 [Details]

Scoped Slots

• support denoting normal elements as scoped slot dae173d [Details]

Provide/Inject

• support providing default values for injections (#6322) 88423fc [Details]

<keep-alive>

• add max prop for <keep-alive> for limiting max number of instances cached 2cba6d4

Other Improvements

• config.ignoredElements can now contain RegExp in addition to strings (#6769) 795b908
• data function is now called with the vm instance as the first argument (#6760) 3a5432a
• vue-template-compiler now ships an environment-agnostic build which can be used directly in browsers in vue-template-compiler/browser.js a5e5b31

Bug Fixes

• compiler: warn when inline-template component has no children (fix #6703) (#6715) baabd6d, closes #6703 #6715
• core: avoid observing VNodes 4459b87, closes #6610
• ref: preserve ref on components after removing root element (#6718) 6ad44e1, closes #6632 #6641
• handle errors in errorHandler 2b5c83a, closes #6714
• ssr: fix hydration mismatch with adjacent text node from slots b080a14, closes vuejs/vue-loader#974
• add slot v-bind warning (#6736) 514b90b, closes #6677
• allow an object's Symbols to be observed (#6704) 4fd2ce8
• fix scoped CSS for nested nodes in functional components 4216588
• ssr: handle inline template compilation error dff85b2, closes #6766
• perperly handle v-if on scoped slot 68bdbf5, closes #6725
• prevent memory leak due to circular reference in vnodes 405d8e9, closes #6759
• properly render value on in IE/Edge c64f9ae, closes #6666
• resolve async component default for native dynamic import 2876ed8, closes #6751
• use correct namespace inside as root node cf1ff5b, closes #6642
• use MessageChannel for nextTick 6e41679, closes #6566 #6690
• work around old Chrome bug 0f2cb09, closes #6601

Internals

We have changed the implementation of Vue.nextTick to fix a few bugs (related to #6566, #6690). The change involves using a macro task instead of a micro task to defer DOM updates when inside a DOM event handler attached via v-on. This means any Vue updates triggered by state changes inside v-on handlers will be now deferred using a macro task. This may lead to changes in behavior when dealing with native DOM events.

For more details regarding micro/macro tasks, see this blog post.

For the new implementation, see source code for nextTick.

v2.4.4

Bug Fixes

• ssr: fix bundleRenderer Promise rejection regression 0c9534f
• ssr: fix style injection regression a2f73f2, closes #6603 #6353

v2.4.3

Bug Fixes

• directive: should invoke unbind & inserted on inner component root element change 538ad20, closes #6513
• inject: exclude not enumerable keys of inject object (#6346) 3ee62fd, closes #6574
• provide: provide should default to parentVal during merging (#6473) 3c21675, closes #6436
• ssr: address possible xss vector 5091e2c
• vdom: avoid diff de-opt when both head/tail are different 230c6ae, closes #6502
• $off should ignore undefined handler argument fa6a729, closes #6591
• ssr: better handle v-html hydration 0f00f8f, closes #6519
• ssr: expose context.styles when no lifecycle styles are injected 1f52a2a, closes #6353
• ssr: fix cachedEscape memory issue 02f8b80, closes #6332
• ssr: handle v-text/v-html with non-string value 09106f0, closes #6572
• ssr: should also escape static text content 172dbf9, closes #6345
• transition: consider async placeholder as valid child to return (#6369) a43d667, closes #6256
• types: add inject option in functional component options type (#6530) 1baa0a7
• types: allow variadic plugin use (#6363) 38d5218, closes #6357
• v-model: Allow using array value with array v-model in checkboxes (#6220) d6e6f1d, closes #6219
• v-model: avoid unnecessary change event on select options change d4d553c, closes #6193
• v-model: fix input listener with modifier blocking v-model update 6f312d6, closes #6552
• vdom: Don't replace input for text-like type change (#6344) f76d16e, closes #6313
• computed properties should not be cached during SSR 06741f3
• deep clone slot vnodes on re-render 0529040, closes #6372
• do not use MutationObserver in IE11 844a540, closes #6466
• ensure $attrs and $listeners are always objects (#6441) 59dbd4a, closes #6263
• ensure outer bindings on nested HOC are properly re-applied on inner root element change a744497
• handle special case for allowfullscreen on d77b953, closes #6202
• inherit SVG ns on component root node (#6511) 89f0d29, closes #6506
• preserve slot attribute if not resolved by Vue 684cd7d, closes #6553
• set value as domProp for 7116af4, closes #6561
• support prop type checking for primitive wrapper objects (#6450) 679cd1f, closes #6447

v2.4.2

Bug Fixes

• v-on: revert component root data.on/data.nativeOn behavior for 1713061, closes #6109
• checkbox v-model="array" ignore false-value (#6180) 3d14e85, closes #6178
• compile: properly generate comments with special character (#6156) d03fa26, closes #6150
• parser: only ignore the first newline in <pre> 082fc39, closes #6146
• provide/inject: merge provide properly from mixins 3036551, closes #6175
• provide/inject: resolve inject properly from mixins (#6107) b0f00e3, closes #6093
• transition: should trigger transition hooks for v-show in ie9 9b4dbba, closes #5525
• v-bind: respect .prop modifier on components (#6159) 06b9b0b
• v-model: use stricter check for <select> option update c70addf, closes #6112
• ensure looseEqual is not dependant on key enumeration order a8ac129, closes #5908
• include boolean in isPrimitive check (#6127) be3dc9c, closes #6126
• work around IE/Edge bug when accessing document.activeElement from iframe fc3d7cd, closes #6157

Improvements

• warn when assigning to computed property with no setter eb9168c, closes #6078

Reverts

• perf: remove src directory from npm module (#6072) ec4b1be

v2.4.1

• Fixed postinstall script error when installing Vue from npm.

v2.4.0 Kill la Kill

"Fear is freedom! Subjugation is liberation! Contradiction is truth!"

Features

• Full SSR + async component support in core: SSR now supports rendering async components used anywhere and the client also supports async components during the hydration phase. This means async components / code-splitting now just works during SSR and is no longer limited at the route level. (9cf6646 & 7404091)

• Easier creation of wrapper components: (6118759)

  • New component option: inheritAttrs. Turns off the default behavior where
    parent scope non-prop bindings are automatically inherited on component root
    as attributes.

  • New instance properties: $attrs & $listeners. $attrs contains the parent-scope attribute bindings that were not recognized as props, and $listeners contains the v-on listeners registered in the parent scope (without the .native modifier). These are essentially aliases of $vnode.data.attrs and $vnode.data.on, but are reactive.

  Combining these allows us to simplify a component like this down into this:

  <div>
    <input v-bind="$attrs" v-on="$listeners">
  </div>

  Based on discussion in #5983.

• v-on: support v-on object syntax with no arguments. This pairs well with the new $listeners instance property when creating higher-order components. Note this syntax does not support modifiers. (11614d6)

• Now auto-resolves ES module default export when resolving async components. This enables keeping using the simpler const Foo = () => import('./Foo.vue') syntax when declaring async components with the changes introduced in [email protected]. (0cd6ef3)

• support .sync modifier for v-bind="object" (#5943) (3965e50), closes #5937

• keep-alive: support Array for include and exclude (#5956) (51c595a)

• weex: implement "weex.supports" api to support feature detection (#6053) (b1512d8)

• vm.$watch now also supports using the same object format supported by the watch component option: { handler: () => {}, deep: true } (#5645) (5aac170)

• types: add types for vue-server-renderer (#5775) (e6de9a5)

• Vue.config.errorHandler now also captures errors thrown in custom event handlers (#5709) (11b7d5d)

• add new config option Vue.config.warnHandler for defining a custom callback for runtime warnings. This only works in the development build. (#5883) (9881b40)

• add comments option to allow preserving comments in template (#5951) (e4da249), closes #5392

Performance Improvements

• ssr: vue-template-compiler now has two new SSR-specific compile methods that generates SSR-specific render function code by optimizing parts of the template into string concatenation. This improves raw SSR render performance by 2~8x depending on how much of the template can be optimized. Note this will have a much smaller impact on requests per second for a real app because raw render performance is only a small portion of the overall time spent in a request.

  This is enabled by default in vue-loader@>=12 and can be disabled using the optimizeSSR option.

• remove src directory from npm module, which should reduce download size when installing from npm. (#6072) (e761573)

Bug Fixes

• check enterToClass/leaveToClass existence before adding it (#5912) (34d8c79)
• ensure cleanup in watcher.get (#5988) (f6cd44c), closes #5975
• improve Vue.set/Vue.delete API to support multi type of array index (#5973) (eea0920)
• multiple merged vnode hooks not invoked properly (91deb4f), closes #6076
• v-model: should generate component-specific code for tags with "is" attribute (a1d1145), closes #6066
• prefetch should not have as attribute (#5683) (ebca266)
• core: add merge strategy for provide option (#6025) (306997e), closes #6008
• support plugin with multi version vue (#5985) (049f317), closes #5970
• core: should preserve reactivity-ness of injected objects (8d66691), closes #5913
• parser: the first newline following pre and textarea tag should be ignored (#6022) (4d68079)
• ref: refactor function registerRef (#6039) (254d85c), closes #5997
• ssr: fix bundleRenderer mapped async chunks caching check (#5963) (de42186)
• ssr: reference error when create $ssrContext for root component (#5981) (5581654), closes #5941
• transition group should work with dynamic name (#6006) (#6019) (d8d4ca6)
• v-model: fix input change check for type="number" (0a9aab5), closes #6069
• v-model: use consistent behavior during IME composition for other text-like input types (fix #5902) (4acc8c8)
• v-bind object should not override props on scopedSlots (#5995) (458030a)
• fix out-in transition for async components (#5760) (c3cdfcf)
• fix memory leak by preventing data.pendingInsert from keeping reference to removed nodes (#5839) (4733408)
• reduce memory usage by avoiding keeping reference to old vdom tree after patch (#5851) (07a3726)
• fix XHTML compatibility (#5852) (69f946b)
• Merge inject option when extending a component (#5827) (080c387)
• support string index when using Vue.set on Array (#5889) (8a2c514)
• ignore reserved attributes (is, ref, ...) in v-bind object syntax (#5881) (d33c125)
• fix slot resolved incorrect with abstract component (#5888) (213f136)

v2.3.4

Fixed

• #5839 fix memory leak caused by reference to removed vnodes on data.pendingInsert

v2.3.3

Fixed

• #5586 fix unecessary input trigger with v-model on change event (@posva via #5589)
• #5591 ssr template interpolation should be whitespace-insensitive (@HerringtonDarkholme via ##5597)
• #5592 fix regression where text nodes are merged into comment placeholder nodes (@maggiehe via #5593)
• #5610 fix Vue.use not chainable when plugin has already been installed, also makes Vue.mixin chainable. (@lzxb via #5610)
• #5615 fix scoped slots when used together with v-for
• #5618 fix slot elements after v-for being unnecessarily recreated (@gebilaoxiong via #5627)
• #5633 fix comment nodes not cloned properly (@pengchongfu via #5633)
• #5635 fix async components timeout triggered when already resolved

v2.3.2

• Components can now access the SSR context as this.$ssrContext
• Internal improvements for handling functional *.vue components style SSR injections

v2.3.1

Fixed

• #5536 fix regression when render function returns null (@gebilaoxiong via #5539)
• #5540 vue-server-renderer/server-plugin: ensure assets are unique (@pi0 via #5540)
• #5553 vue-server-renderer/server-plugin: avoid swallowing webpack error when entry is not found
• #5559 vue-server-renderer: with runInNewContext: false, the bundle is now indeed executed in the same context. The 2.3.0 behavior is still available behind a new option value runInNewContext: 'once'. See docs for more details.