Version

3.0.0-rc.9

Reproduction link

https://codesandbox.io/s/bold-fermat-28wgn?file=/src/composition/paginate.ts

Steps to reproduce

Just check the typings errors in the editor, especially at line 28 and 41

What is expected?

my dataTransformer function that returns T[] should be able to assign its return value to data.value

What is actually happening?

Impossible, typings don't allow me to do that.

This code used to work in @vue/composition-api on version 0.6.

I probably don't understand how some typings work, or maybe I need to cast some values differently.

Generics and ref, you need to cast to T

Check https://github.com/vuejs/vue-next/pull/1129

And https://github.com/microsoft/TypeScript/issues/33942

Also Vue 3 docs https://v3.vuejs.org/guide/typescript-support.html#typing-refs

Ohhh that helped a lot. Thank you very much.