How to check the existence of an object in dispatch?

Question

typescript

Good evening! Tell me how can I check whether an object exists in the dispatcher or not. For example, I have a type that has

interface DataState {
  Data: ExpectedData| null;
   Favorite: false;
}
const data = useSelector(state => state.DataState.Data)
const favorite = useSelector(state => state.DataState.Favorite)
const dispatch = useDispatch()
.......

if(favorite){
   dispatch(someFunction(data))  //допустим тут я хочу задиспатчить данные
}

How to make the dispatcher not swear that the argument = null ?

Answer 1

As Lynn "Coffeeman" already said : in order for typescript not to swear at nullyou, you must make sure that there is no null. Pretty obvious, yes.
In practice, you need to do either:

const data = useSelector(state => state.DataState.Data) ?? defaultData;

Or like this:
if (favorite && data) {
Well, or something else, to your taste.