How to enforce stricter TypeScript typing in a generic createReducer function?

I have a utility function createReducer that takes a reducer function and returns it:

How to enforce stricter TypeScript typing in a generic createReducer function?

I have a utility function createReducer that takes a reducer function and returns it:

How to enforce stricter TypeScript typing in a generic createReducer function?

I have a utility function createReducer that takes a reducer function and returns it: