JAVASCRIPT

firebase firestore delete field

document.ref.update({
  FieldToDelete: admin.firestore.FieldValue.delete()
})

firebase remove field

// get the reference to the doc
let docRef=this.db.doc(`ProfileUser/${userId}/followersCount/FollowersCount`);

// remove the {currentUserId} field from the document
let removeCurrentUserId = docRef.update({
    [currentUserId]: firebase.firestore.FieldValue.delete()
});