fix(runtime-vapor): deliver evaluated props and dynamic slots to components - #15708
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe Vapor runtime now collects component props and slot sources before delivering updates. It tracks prop and attr dependencies, integrates delivery with VDOM interop, and updates input handling for cached and wrapped components. Tests cover delivery timing, reactivity, interop, and lifecycle behavior. ChangesVapor component input delivery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant ParentInputEffect
participant collectInputs
participant deliverInputs
participant ChildProps
ParentInputEffect->>collectInputs: collect raw props and slot sources
collectInputs->>deliverInputs: provide collected values
deliverInputs->>ChildProps: update props and notify dependencies
Suggested reviewers: Merge Risk: 🔵 Low · up to The new input-delivery model is mostly consistent. Two edge cases can show wrong data: an async error component can receive a parent's 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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@vue/compiler-core
@vue/compiler-dom
@vue/compiler-sfc
@vue/compiler-ssr
@vue/compiler-vapor
@vue/reactivity
@vue/runtime-core
@vue/runtime-dom
@vue/runtime-vapor
@vue/server-renderer
@vue/shared
vue
@vue/compat
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…s on a null-prototype table
…s and key deps in a map
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…iver its slots in the same batch
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/runtime-vapor/src/apiDefineAsyncComponent.ts:
- Around line 282-283: Update the error-component prop sources so the forwarded
parent attrs are applied first and a trailing object source provides `error:
getError`. This ensures the load failure takes precedence over a parent `error`
attr while keeping `getError` tracked through `readSource`.
Review comments at @packages/runtime-vapor/src/component.ts:
- Around line 397-401: On the KeepAlive cache-hit path, `cached.slotSources`
retains dynamic slot descriptors from the original call site. Update
`cached.rawSlots` from the current `rawSlots` using `normalizeRawSlots` and call
`initSlots(cached)` before `initInputs(cached)` so inputs use the current call
site's slots; add coverage for two same-key call sites with different dynamic
slots.
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📒 Files selected for processing (30)
packages/reactivity/src/dep.tspackages/reactivity/src/index.tspackages/runtime-core/src/apiCreateApp.tspackages/runtime-vapor/__tests__/apiCreateVaporApp.spec.tspackages/runtime-vapor/__tests__/apiDefineAsyncComponent.spec.tspackages/runtime-vapor/__tests__/apiSetupHelpers.spec.tspackages/runtime-vapor/__tests__/apiWatch.spec.tspackages/runtime-vapor/__tests__/component.spec.tspackages/runtime-vapor/__tests__/componentAttrs.spec.tspackages/runtime-vapor/__tests__/componentEmits.spec.tspackages/runtime-vapor/__tests__/componentProps.spec.tspackages/runtime-vapor/__tests__/componentSlots.spec.tspackages/runtime-vapor/__tests__/components/KeepAlive.spec.tspackages/runtime-vapor/__tests__/customElement.spec.tspackages/runtime-vapor/__tests__/gc.spec.tspackages/runtime-vapor/__tests__/hmr.spec.tspackages/runtime-vapor/__tests__/vdomInterop.spec.tspackages/runtime-vapor/src/apiDefineAsyncComponent.tspackages/runtime-vapor/src/apiDefineCustomElement.tspackages/runtime-vapor/src/component.tspackages/runtime-vapor/src/componentEmits.tspackages/runtime-vapor/src/componentProps.tspackages/runtime-vapor/src/componentSlots.tspackages/runtime-vapor/src/components/KeepAlive.tspackages/runtime-vapor/src/components/TransitionGroup.tspackages/runtime-vapor/src/fragment.tspackages/runtime-vapor/src/keepAlive.tspackages/runtime-vapor/src/renderEffect.tspackages/runtime-vapor/src/vdomInterop.tsvite.config.ts
💤 Files with no reviewable changes (1)
- packages/runtime-vapor/src/keepAlive.ts
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… Tabs and SegmentedControl report a selection once rc.10 delivers a component's props on the scheduler, the way vdom hands a child the values its parent rendered (vuejs/core#15708, the fix for vuejs/core#15673). A child reads the previous value until the parent's update runs, so `useDefaultDateProps`'s same-turn test drives the composable from a ref, as a picker does, rather than through a host's props. The same delivery resolves a declared prop that arrives under two raw keys to the last of them, as vdom's `setFullProps` does, where rc.9 took the first. The SegmentedControl fixture bound `:on-selection-change` and `@selection-change` side by side and counted on the old order to keep the callback and the event apart. Both keys are `onSelectionChange`, and `emit` finds a declared `onX` prop as well (rc.9 and vdom alike), so the last handler now ran twice and the first never. Tabs and SegmentedControl report `selectionChange` through the prop alone and no longer emit it. rc.10 landed inside pnpm's minimum release age, so its packages are excluded from it by exact version.
…nent on the next tick Since vue 3.6.0-rc.10 a Vapor component's props are delivered on the scheduler (vuejs/core#15708), so the helper's note that DOM updates follow a `ref` with no `rerender` step no longer tells the whole story: the component reads the previous value until `await nextTick()`, and writes inside one turn collapse into the last.
Fixes #15673
Vapor resolves component inputs through lazy getters: a child reads
props.xand the parent's expression runs at that moment. A synchronous watcher in the child can therefore evaluate a parent expression before the parent's own queued update (thev-ifthat guards it) has run.1. A prop read after its guard flipped (#15673)
The write notifies the child's sync watcher immediately. It re-runs the getter
() => user.namewhile the parent'sv-ifeffect is still waiting in the scheduler queue, souser.nameis evaluated onnull. In VDOM the parent render evaluatesuser.nameand hands the value to the child; the child keeps the old value until the parent patches it, and thev-ifruns first.2. A dynamic slot descriptor read after its guard flipped
The descriptor
() => data.x.show ? { name: 'foo', fn } : undefinedis the parent's expression too, but the child evaluates it through a computed when it readsslots.foo. Dynamic slot names andv-forslots fail the same way.3. One tick, two inputs, an intermediate state
Even with delivered values, writing the child's props key by key lets a sync watcher observe the new
itemnext to the oldshow. The same happens between a prop and a slot descriptor (if (slots.foo) props.item.name).4. Vapor content inside a vdom host
Effects created while a vdom instance is current got
order = NaNand shared the host's scheduler slot, so the child's inputs could run before the host update that removes the child.VDOM evaluates these expressions during the parent render and hands the child the resulting values; until the parent patches the child, its inputs keep their previous values. This PR gives Vapor the same input-delivery boundary, and makes each delivery atomic for sync watchers (case 3), which VDOM does not.
Design
Each component gets one input effect, owned by the child's scope but ordered among the parent's effects. Every run evaluates the child's prop getters and dynamic slot descriptors, then publishes them in one batch:
props/attrsproxies read, with per-key change notifications (emitandrawKeysread the raw frame untracked, as a vnode would);_cacheprotocol;Inputs that can never change (no getters, no function descriptors, constant getters,
v-once) are delivered once and keep no effect; their reads are not tracked. Without dynamic sources, later runs deliver only the getters whose value changed (the store is patched in place).Other paths:
createVDOMComponentruns the same input effect and delivers to the wrapper instance.Also fixed on the way
Deliberately different from VDOM
instance.propskey by key and throws in the same scenarios.Numbers
Bundled prod build, 3000 components, p25 (minor / PR):
createVaporAppusage size: +2.4 kB min / +0.9 kB gzip@vue/reactivitygains@internalexports (Depwith an optional table,trackDep,triggerDep,activeSub) so the input store can key deps on the instance withouttargetMap.Summary by CodeRabbit