Will It Vibe?Deprecated lifecycle hook (beforeDestroy/destroyed)
Part of Code Quality & Syntax, which counts for 20% of the overall score. When this check fires it deducts 4 points from that category, once per scan, no matter how many places it turns up.
What it detects
The beforeDestroy and destroyed lifecycle hooks were renamed to beforeUnmount and unmounted in Vue 3. The old names are ignored after a Vue 3 upgrade, so teardown logic silently stops running.
Why it matters
Vue 3 renamed the beforeDestroy and destroyed lifecycle hooks to beforeUnmount and unmounted. The old names are not recognized in Vue 3, so any cleanup you put there (clearing timers, removing listeners, closing sockets) silently never runs, which leaks resources and can cause callbacks to fire on torn-down components. The template and script still compile, so the regression is easy to miss.
How to fix it
Rename beforeDestroy to beforeUnmount and destroyed to unmounted in Options API components. In the Composition API use onBeforeUnmount and onUnmounted. Keep the hook bodies unchanged. If the project is still on Vue 2, plan this rename as part of the upgrade since the old names work there but not after.
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