TS: defineComponent returns incorrect type

[jods4]

Version

3.0.0-alpha.4

Reproduction link

https://codesandbox.io/s/boring-cerf-fkv0z

Steps to reproduce

In Typescript, use defineComponent to create a component, then try to use it with .component('x-tag', MyComponent).

What is expected?

TS should compile (it does run).

What is actually happening?

There is a type error at compilation.

---

The problem seems to be that defineComponent is lying about its return type. It says that it returns a constructor, which is not true since it is mostly a noop (it returns its parameter directly, which is an object).

createApp accepts this because it seems to accept constructors in addition to components. But .component() does not.

[jods4]

@yyx990803 It's still broken in alpha.8.