Vize
vize:croquis/cf/reference-escapes-scope
A reactive reference escapes the scope that owns its lifetime.
Default severity: Not emitted
Applies to: Analyzed component graph and the supported facts described below
Automatic fix: None; review related files and apply the repair
Options: No per-code options; supported CLI findings accept severity overrides
This is a published diagnostic contract without a current producer. The Bad/Good scenario below explains the risk and repair; no flag currently makes this code trigger.
Refs may legitimately be returned from composables or shared across scopes. This example explicitly requires a snapshot cache; it does not claim that unmount invalidates a ref. No current producer emits this contract.
Shared project files
Use these unchanged files in both Bad and Good. Install the imported packages in the project: Vue, plus vue-router or Pinia where shown. Follow any version-specific support note. The entry root makes the component relationship explicit.
main.ts
import { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#app');
index.html
<!doctype html>
<html lang="en"><head><meta charset="UTF-8"><title>Contract scenario</title></head>
<body><div id="app"></div><script type="module" src="/main.ts"></script></body></html>
saved.ts
import type { Ref } from 'vue';
let saved: Ref<number> | number | undefined;
export function remember(value: Ref<number> | number): void { saved = value; }
export function remembered(): Ref<number> | number | undefined { return saved; }
Bad
The process-level cache retains the component’s live count ref. It can keep that instance state reachable after unmount and can observe later edits, although this cache is intended to store a snapshot.
App.vue
<script setup lang="ts">
import { ref } from 'vue';
import { remember } from './saved';
const count = ref(0);
remember(count);
</script>
<template>
<button @click="count++">{{ count }}</button>
</template>
Good
The cache receives the current plain number, so it keeps a snapshot without retaining the component-owned ref.
App.vue
<script setup lang="ts">
import { ref } from 'vue';
import { remember } from './saved';
const count = ref(0);
remember(count.value);
</script>
<template>
<button @click="count++">{{ count }}</button>
</template>
The Good files demonstrate the change described above; other diagnostics can still apply to the complete project.