fix(types): defineEmits w/ interface declaration

[edison1105]

close #8457

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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	21 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: c4e9b3f

[yyx990803]

This widens the type constraint for the interface, but I think it's worth it.

If the user writes something like

interface Emits {
  bar: 1 // !!!!
}

Now it will be allowed, but the emit function will expect ...args to be of type 1, which will never be satisfied, so that serves as a safeguard against misuse.