(typescript): Request for adding different types(interfaces) for the query data from useQuery and subscribeToMore data

[arkajyotiMukherjee]

const { subscribeToMore, data, loading, error } = useQuery<MyQueryInterface>(
   MY_QUERY_DOCUMENT
  );

The MyQueryInterface defines the variable data's type.
Now I have a use-case where the data from the Query is an array and the subscribeToMore subscription returns me any new array element that are created.
For example, the interface for query might be

interface MyQueryInterface {
  someArray: number[];
}

but my subscription data returns

interface MySubscriptionInterface {
  singleArrayElement: number;
}

Now in the subscribeToMore function I have to combine these two and it works fine if I do not type my query but if I do type them the subscription data doesn't have a someArray and it throws a type error.

If I could provide types for my subscription in subscribeToMore like I can give types to my query data and query variables...that would be nice.
Like:

const { subscribeToMore, data, loading, error } = useQuery<
    MyQueryInterface, MySubsriptionInterface, QueryVriableInterface
  >(
   MY_QUERY_DOCUMENT
  );

Do let me know if this feature is a duplicate or is not valid...I'll provide some more context.

EDIT:
This is not in the docs but I found this is possible and I solved the problem but don't know if this is the proper method.
I put an interface just before calling subscribeToMore like this:

subscribeToMore<MySubscriptionInterface>({
  document: SUBS_DOC,
  updateQuery: (prev, {subscriptionData}) => {
    ...
  }
})

If you think this solution is expected we can close this issue or take some steps to add it to the docs.
Thanks in advance.

[mahieyin-rahmun]

I agree that this should be in the docs. I was struggling with this until I found this issue. Thanks for sharing the solution/workaround!

[jpvajda]

@arkajyotiMukherjee thanks for reporting this, I'll move this over to the Apollo Client project and determine if we can make a documentation improvement on this topic.