types(emits): simplify types

[Alfred-Skyblue]

Simplify types to make them easier to read.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	87 kB	33.1 kB	29.9 kB
vue.global.prod.js	133 kB	49.9 kB	44.7 kB

Usages

Name	Size	Gzip	Brotli
createApp	48.3 kB	19 kB	17.4 kB
createSSRApp	51.5 kB	20.3 kB	18.5 kB
defineCustomElement	50.7 kB	19.8 kB	18 kB
overall	61.7 kB	23.9 kB	21.7 kB

[codspeed-hq]

CodSpeed Performance Report

Merging #9788 will not alter performance

_{Comparing Alfred-Skyblue:types/eimts-simplify (b133c8c) with main (60415b5)}

Summary

✅ 53 untouched benchmarks

[yyx990803]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

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

[pikax]

LGTM