types(runtime-core): fix type constraints for default in PropOptions

[jh-leong]

close #12145

Correct the default field type to prevent assigning arbitrary objects.

refix #1891. If type specifies a Function, the default field type should match the specified function type.

---

NOTE: Due to TypeScript's literal-inference, when type is a literal type, the default cannot be strictly enforced.

Consider the following example:

// `foo.default` is inferred as `string` instead of the literal type `'foo'`
const foo = {
  type: String as PropType<'foo' | 'bar'>,
  default: 'foo',
}

// Strictly enforcing `default` to be `'foo' | 'bar'` would break existing cases:
defineComponent({
  props: { foo }, // should allow
})

[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

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commit: 609d33b

[jh-leong]

/ecosystem-ci run

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📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	❌ failure	✅ success
nuxt	✅ success	✅ success
pinia	✅ success	✅ success
primevue	✅ success	✅ success
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

[jh-leong]

/ecosystem-ci run language-tools

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suite	result	latest scheduled
language-tools	❌ failure	✅ success

[jh-leong]

/ecosystem-ci run language-tools

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	✅ success	✅ success

[jh-leong]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	✅ success	✅ success
nuxt	✅ success	✅ success
pinia	✅ success	✅ success
primevue	✅ success	✅ success
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