[TypeScript] Can not access props in mapState

[galenyuan]

Version

3.0.0

Reproduction link

https://github.com/galenyuan/todomvc-vue-typescript/blob/master/src/pages/Home.vue#L63

Steps to reproduce

npm i
npm run dev

What is expected?

no errors

What is actually happening?

(63,22): error TS2339: Property 'type' does not exist on type 'VueConstructor<Vue>'.

[HerringtonDarkholme]

We probably cannot support accessing this in mapState or so.

Vue uses ThisType to check this in methods. However, ThisType will only work in object literal contexually typed, or object literal which is a direct child of another ThisTyped object literal.

Simply put, you cannot infer this in mapState. You have to define it as an object literal, not in a function call.

[galenyuan]

what about note it in doc if can not support accessing this in mapState?

[SidKwok]

Any progress on this issue?

[ktsn]

#1044

[ryutamaki]

I said in #1044 but let me say again here.
Could you merge and release this feature or please let us know when that would be merged?