feat(vapor): vapor transition + transition-group

[edison1105]

Compiler Changes

• Within Vapor components
  • Transition is automatically rewritten as VaporTransition
  • TransitionGroup is automatically rewritten as VaporTransitionGroup
• When the root node of a Transition uses the v-if, the compiler automatically adds a $key property to the rendering result, making it easier for the runtime to track the element's leaving state using the key

 <Transition> <h1 v-if="show"> <span>HI</span> </h1> </Transition>

will be compiled to

 const n4 = _createComponent(_VaporTransition, null, { "default": () => { const n1 = _createIf(() => (_ctx.show), () => { const n3 = t1() n3.$key = 3 // adds a `$key`  return n3 }) return n1 } })

• When the root node of a Transition has an explicit key, the compiler generates code that includes createKeyedFragment, which creates a new DynamicFragment when the key changes, triggering transitions

 <Transition> <span :key="count">{{ count }}</span> </Transition>

will be compiled to

 const n1 = _createComponent(_VaporTransition, null, { "default": () => { return _createKeyedFragment(() => _ctx.count, () => { const n0 = t0() const x0 = _child(n0) _renderEffect(() => _setText(x0, _toDisplayString(_ctx.count))) n0.$key = _ctx.count return n0 }) } })

• When appear is set in the Transition and the root node uses v-show, it need to execute applyVShow after the Transition is created to ensure that the appear behavior works properly.

 <div> <transition appear> <div v-show="!toggle">content</div> </transition> </div>

will be compiled to

 const deferredApplyVShows = [] const n2 = t1() const n1 = _createComponent(_VaporTransition, { appear: () => (""), persisted: () => ("") }, { "default": () => { const n0 = t0() deferredApplyVShows.push(() => _applyVShow(n0, () => (!toggle.value))) return n0 } }) _insert(n1, n2) deferredApplyVShows.forEach(fn => fn()) return n2

Runtime Changes

• Added VaporTransition and VaporTransitionGroup components that reuses most of the logic from runtime-dom/Transition
• Transition hooks are now stored on the block.$transition property
• DynamicFragment Update Logic Modification:
  • When removing old elements, leave animations are triggered
  • When rendering new elements, enter animations are triggered
• Extracted baseResolveTransitionHooks from the existing resolveTransitionHooks function to be shared between VaporTransition and Transition. Each component passes its own specific TransitionHooksContext
• Interop:
  • Existing Transition component now supports rendering Vapor components

Tests

• Ported all test cases except those related to KeepAlive, Suspense, and Teleport from packages/vue/tests/e2e/Transition.spec.ts
• Ported all test cases from packages/vue/tests/e2e/TransitionGroup.spec.ts

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