defineEmits<{}>() cannot pass type-checking

[lsdsjy]

Problem

Declaring empty emits like defineEmits<{}>() would fail the type-checking process.

Reproduction

https://stackblitz.com/edit/vitejs-vite-ibxwhy?file=src/components/HelloWorld.vue

Steps
Run yarn type-check.

Environment

vue@2.7.14, vue-tsc@1.0.24
(Also tested on vue@3, no errors but still get wrong types in template, where the msg is inferred as of type never.)