Type Error in Collection when typing query.

[mnlfischer]

Hello, I'm not if it is a bug or wrong implementation.

When I type the query:

export declare function query<T>(query: Query<T>, ...queryConstraints: QueryConstraint[]): Query<T>;

as

const q = query<{foo: string}>(
  collection(db, 'bar')
);

I got the following error

Argument of type 'CollectionReference<DocumentData>' is not assignable to parameter of type 'Query<{ foot: string; }>'.

This is the collection type declaration:

export declare function collection(firestore: FirebaseFirestore, path: string, ...pathSegments: string[]): CollectionReference<DocumentData>;

This error occurs in 9.0.0-beta.2 - 9.0.0-beta.6
Any advice how to solves this? I tried to merge my interface with document data without success.
Should I use a converter instead without typing the query?

[Feiyang1]

Yes, you should use withConverter instead of typing querys directly. It is by design, so that you can't type query arbitrarily which may not be safe at runtime.

[mnlfischer]

works fine. Thanks!