defineComponent infers props incorrectly when prop is Function type

[jw-foss]

Version

3.0.0-rc.5

Reproduction link

https://codesandbox.io/s/cranky-gareth-k92ch?file=/src/test.ts

Screenshots

Steps to reproduce

Before get started, make sure you have set your script language to ts

1. Define a new component with defineComponent method
2. Define any prop with type Function as PropType<() => void>
3. Assign default value to the prop you just defined as NOOP in @vue/shared or () => { }
4. Define a setup method
5. Try calling the method you just defined directly as props.methodYouDefined()
6. Observe

What is expected?

Expect the type system correctly infers the type of the prop that you defined.
The current implementation says the prop.value's type is (void | () => void), which is combined result of prop.type and typeof result of prop.default.
the expected result should be () => void which is the combined result of prop.type and typeof prop.default

What is actually happening?

(property) propYouDefined: void | (() => void)

This expression is not callable.
  
Not all constituents of type 'void | (() => void)' are callable.
   
 Type 'void' has no call signatures.

[HcySunYang]

This will be fixed in the next release.

[posva]

@HcySunYang I also thought this was fixed by your PR but it seems to fail: master...test/types/props-default

[pikax]

Is not fixed yet.

This is caused by the DefaultFactory adding the return value type.

[HcySunYang]

@pikax Aha, I just saw that you have submitted a PR for this issue, but our approach is different.