Using Firestore with Typescript

const app = initializeApp(firebaseConfig);
export const auth = getAuth(app);
export const firestore = getFirestore(app);

const converter = <T extends DocumentData>(): FirestoreDataConverter<T> => ({
  toFirestore: (user: T) => user,
  fromFirestore: (snapshot: QueryDocumentSnapshot) => {
    return snapshot.data() as T;
  },
});

const dataPoint = <T extends DocumentData>(collectionPath: string, ...pathSegments: string[]) =>
  collection(firestore, collectionPath, ...pathSegments).withConverter(converter<T>());

const db = {
  users: dataPoint<FirestoreUser>('users'),
  matches: dataPoint<FirestoreMatch>('matches'),
  messages: (matchId: string) => dataPoint<ChatMessage>('matches', matchId, 'messages'),
  user: (userId: string) => doc(dataPoint<FirestoreUser>('users'), userId),
  match: (matchId: string) => doc(dataPoint<FirestoreMatch>('matches'), matchId),
  message: (matchId: string, messageId: string) =>
    doc(dataPoint<ChatMessage>('matches', matchId, 'messages'), messageId),
};

export default db;