types: compatible with TS 5.8

[yangmingshan]

Ref: https://devblogs.microsoft.com/typescript/announcing-typescript-5-8/#granular-checks-for-branches-in-return-expressions

This PR didn't upgrade TypeScript, it only fixed the type errors that arose after the upgrade.

I couldn't find an elegant solution for proxyRefs, so I resorted to using as any 😬

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38.1 kB	34.3 kB
vue.global.prod.js	158 kB	58 kB	51.6 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.6 kB	21.3 kB	19.4 kB
createSSRApp	58.8 kB	23 kB	21 kB
defineCustomElement	59.4 kB	22.9 kB	20.8 kB
overall	68.6 kB	26.4 kB	24.1 kB

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commit: 1a70104

[edison1105]

I tested that revert this change and the change of line 50.
tsc works fine.

[yangmingshan]

Yes. I just thought we can get rid of the type assertion, I can change it back.

[yangmingshan]

Reverted.

[yangmingshan]

I added some type tests for nextTick

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	✅ success	✅ success
nuxt	❌ failure	❌ failure
pinia	✅ success	✅ success
primevue	❌ failure	❌ failure
quasar	✅ success	✅ success
radix-vue	✅ success	✅ success
router	✅ success	✅ success
test-utils	✅ success	✅ success
vant	✅ success	✅ success
vite-plugin-vue	✅ success	✅ success
vitepress	✅ success	✅ success
vue-i18n	✅ success	✅ success
vue-macros	✅ success	✅ success
vuetify	✅ success	✅ success
vueuse	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success