fix(type): fix nullabe props not getting undefined union

[devTeaa]

close #12098

The original implementation didn't carry over the union type

[devTeaa]

Can this be merged @edison1105 ?

[pkg-pr-new]

Open in Stackblitz

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@12103

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@12103

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@12103

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@12103

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@12103

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@12103

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@12103

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@12103

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@12103

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@12103

vue

pnpm add https://pkg.pr.new/vue@12103

commit: 4728d1b

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB	38.1 kB	34.3 kB
vue.global.prod.js	160 kB	58.1 kB	51.6 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49.2 kB	19 kB	17.3 kB
createApp	55.8 kB	21.5 kB	19.6 kB
createSSRApp	59.8 kB	23.2 kB	21.1 kB
defineCustomElement	60.6 kB	23.1 kB	21 kB
overall	69.5 kB	26.6 kB	24.2 kB

[yyx990803]

Looks like the type tests are not passing. We also need a test case dedicated for what this intends to fix.

[devTeaa]

updated @yyx990803 , @edison1105