useSetState add lazy initialization

[AntonS86]

please add lazy initialization like in useState hook

// useState
const [state, setState] = useState(() => {
  const initialState = someExpensiveComputation(props);
  return initialState;
});

// useSetState
const [state, setState] = useSetState(() => ({cnt: 0}));

[Bidhu1024]

I can fix this. Please assign it to me.

[dovidweisz]

This actually already works. (initialState is just passed to setState)

It's just a matter of updating the types to allow it.