fix(types): defineEmits w/ interface declaration

[edison1105]

close #8457

[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	21 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@12343

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@12343

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@12343

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@12343

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@12343

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@12343

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@12343

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@12343

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@12343

vue

pnpm add https://pkg.pr.new/vue@12343

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@12343

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.