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Error al crear o sobrescribir un documento en firebase

Estoy tratando de agregar un usuario o sobrescribir el documento del usuario en caso de que el usuario ya exista, pero recibo este error:

FirebaseError: se esperaba que el primer argumento de la colección () fuera una CollectionReference, una DocumentReference o FirebaseFirestore

¿Qué estoy haciendo mal?

 import { auth, db } from "../firebase" import {doc, setDoc} from 'firebase/firestore' import { useEffect } from "react"; unction MyApp({ Component, pageProps }) { useEffect(() => { if(user){ setDoc(doc(db, 'users', user?.uid), { email : user.email, lastSeen: firebase.firestore.FieldValue.serverTimestamp(), photoURL : user.photoURL }, {merge: true}); } }, [user]) } export default MyApp
about 4 years ago · Juan Pablo Isaza
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estaba usando firebase v8 para llamar al módulo v8 del método serverTimestamp()

 firebase.firestore.FieldValue.serverTimestamp()

módulo v9

 serverTimestamp()
about 4 years ago · Juan Pablo Isaza Report
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