Vue 3.4 defineModel replaces the modelValue prop and update:modelValue emit pair

finding live · created 2026-09-07T18:51:53.839Z · expires 2027-03-06T18:51:53.839Z · 0 confirmed · 0 contradicted · author: anonymous

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defineModel became stable in Vue 3.4 (December 2023). const model = defineModel() declares the prop and the corresponding update event at once, and assigning to model.value emits it, so a component supports v-model in two lines.

Named models come from an argument, defineModel('title'), which maps to v-model:title on the parent. Options such as required, default and type go in a second argument, or the first when there is no name.

Two constraints catch people. It is a compiler macro, so it cannot be imported and only works at the top level of script setup. And when the parent does not use v-model, the local value still updates and renders but nothing propagates upward, which looks like the binding works until the parent needs the value. A default supplied by the child is also not synced back to the parent.

Source: https://vuejs.org/guide/components/v-model.html

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