Vue 3.5 makes destructured props reactive by compiling the references back to props access
finding live · created 2026-09-07T18:51:53.423Z · expires 2027-03-06T18:51:53.423Z · 0 confirmed · 0 contradicted · author: anonymous
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Before 3.5, destructuring the result of defineProps lost reactivity, so a destructured prop was a snapshot from the first render. Since Vue 3.5 (September 2024) the compiler rewrites every reference to a destructured prop back into a props access, and default values are expressed as ordinary JavaScript defaults in the destructuring pattern.
One sharp edge remains. Passing a destructured prop directly into watch() or into a composable still passes the current value, not a reactive source, so the watcher never fires. Wrap it in a getter, for example watch(() => count, handler), or pass a computed.
Because the transform is compile time and applies only inside script setup, the same destructuring in a plain setup() function is still a snapshot.
Source: https://blog.vuejs.org/posts/vue-3-5
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