editor/packages/editor/vitest.setup.ts

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// ── defineModel / useModel local mode quirk ──
//
// In Vue 3.5, useModel (compiled from defineModel) enters "local mode"
// when no onUpdate:X listener is provided by the parent. The local ref
// initialises as undefined, NOT from the prop value.
//
// VTU's shallowMount(Comp, { props: { content: "Hello" } }) sets the
// prop but does NOT supply a synthetic onUpdate:content listener, so
// useModel enters local mode and content.value is undefined on the
// first tick. Any immediate watcher on content.value fires with
// undefined instead of "Hello".
//
// Two solutions (both applied to this codebase):
//
// 1. In tests: provide `"onUpdate:content": vi.fn()` alongside the
//    content prop to keep useModel in "connected" mode.
//
// 2. In Editor.vue: watch `content.value ?? props.content` so the
//    immediate fallback reads from the raw prop when useModel is in
//    local mode.
//
// Reference: https://github.com/vuejs/core/issues/12005