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An element mounted during a flush queues its mounted directive hooks to the post-flush queue. If the element is updated in the same flush before that queue runs, the mounted hooks received the binding from mount time and could undo the update, e.g. v-model restoring the old value. Link bindings whose mounted hooks are still pending to the vnode of the next update, so the mounted hooks receive the latest binding and vnode. close vuejs#15774
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughDirective hook invocation now tracks binding updates that occur before queued mounted hooks run. The mounted hook uses the latest linked binding and vnode. Regression tests cover directive lifecycle timing and v-model state across form controls. ChangesDirective mount updates
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The change makes queued directive mounted hooks use the latest binding, which fixes the stale v-model value from the linked issue. No concrete merge risk was identified in the supplied context. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change does not demonstrate a new privilege or trust-boundary crossing. However, changing a directive list while mounting is delayed can skip one initializer and run another twice, creating a bounded lifecycle-ownership risk. Retained concerns
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Review comments at @packages/runtime-core/src/directives.ts:
- Line 204: Update the `_next` traversal in the directive lifecycle callback to
follow the matching binding identity rather than selecting a binding by index.
Preserve the original directive association as `withDirectives` changes the
binding list, so queued callbacks invoke each directive’s lifecycle hook exactly
once.
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packages/runtime-core/__tests__/directives.spec.tspackages/runtime-core/src/directives.tspackages/runtime-dom/__tests__/directives/vModel.spec.ts
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close #15774
Problem
When an element is mounted during a scheduler flush, its
mounteddirective hooks are queued to the post-flush queue. If the element is updated in the same flush before that queue runs (e.g. by awatch()created outside of components, which runs after the component jobs), the hooks run in this order:Component
mountedhooks read live state, but directivemountedhooks receive the binding saved when the element mounted. Any directive that writes to the DOM inbeforeUpdateand inmountedundoes the update.v-modelon text inputs, textareas and checkboxes does this:beforeUpdatesets the new value, thenmountedrestores the old one.Fix
In
invokeDirectiveHook:beforeMountmarks each binding as pending.mountedhook follows the links to the latest binding and vnode, and resetsoldValuetoundefinedas for a regular mount.No links are created once
mountedhas run, so nothing is retained afterwards. This fixes the issue for all directives, not onlyv-model.Performance
There's no
WeakMapor other per-element bookkeeping: mounting does two extra property writes per binding, and updates do one extra read. Mounting and updating 20k elements with a directive (runtime-test, median of 5 alternating runs) showed no measurable difference: mount ~38.9 → ~38.3 ms, update ~31.6 → ~31.8 ms.Tests
runtime-core: a custom directive updated before its queuedmountedhook receives the latest binding and vnode, witholdValueundefined.runtime-core: the same while a pending Suspense holds back themountedhooks and the hidden branch is updated.runtime-dom:v-modeltext, textarea, checkbox (boolean, array and unchanged value), radio and select, each mounted and updated in the same flush.Alternative
If changes to
invokeDirectiveHookaren't wanted, this can be fixed invModelText/vModelCheckboxinstead. Custom directives would then still get the stale binding.Summary by CodeRabbit