@so1ve I tested this locally and it doesn't seem to fix#13104 - is this something you still intend to work on? We might be able to get this in the final patch release before EOL.

I'll take a look and add tests

I need some help, I couldn't get emits fromextends andmixin work...

This fix is beyond my capabilities and I hope someone else can fix it.

@so1ve I tested this locally and it doesn't seem to fix#13104 - is this something you still intend to work on? We might be able to get this in the final patch release before EOL.

#13133

https://github.com/vuejs/vue/pull/13133/files#diff-d26123bca327fbaf4e0ce33d7085fcaf9f4a39be4f76a1d0c15e0843afb1af9fR153

Maybe this is the key line to resolve the error of#13104

No, your implementation doesn't takeextends andmixin into account

No, your implementation doesn't takeextends andmixin into account

Yes, you are right, I'm working on it. But now I have some questions. I see you add a test that you can getemit functions fromprops insetup function, but theprops does not expose those functions. It is a right type test?

Yes, because it can beundefined

Does it mean that If a component useprops.onFoo in runtime, the function will never work? Is theonFoo only used for type inference?

Yes, seemed to be true

#13133

I think it works with extends and mixin now.