fix(types): should wrap the top level setup refs with ShallowReactive

[KazariEX]

re-fix #12095

Expose IsShallowReactive to enable type determination in language tools.

In non-strict mode, undefined extends ShallowRef<infer V, unknown> will be inferred as true, causing UnwrapRef<undefined> to be inferred as unknown. Fix it here by the way.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38 kB	34.2 kB
vue.global.prod.js	159 kB	57.9 kB	51.4 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.9 kB	18.3 kB	16.7 kB
createApp	55 kB	21.3 kB	19.4 kB
createSSRApp	59 kB	23 kB	20.9 kB
defineCustomElement	59.8 kB	22.8 kB	20.8 kB
overall	68.7 kB	26.3 kB	24 kB

[pkg-pr-new]

Open in Stackblitz

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@12272

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@12272

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@12272

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@12272

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@12272

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@12272

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@12272

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@12272

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@12272

vue

pnpm add https://pkg.pr.new/vue@12272

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@12272

commit: 3561e57