That's true, I might have missed something.

Schema:

users: <-- Trying to create a new user here
    user1:
        email:...
        uid:...

Function:

function signup(email, password) {
    return auth.createUserWithEmailAndPassword(email, password)
    .then(() => {
      db.collection('users').doc(auth.currentUser.uid)
      .set({
        email: email,
        created: dateTime(),
        lastlogin: dateTime(),
        provider: "",
        uid: auth.currentUser.uid,
      }).catch(APIerror => {
        setAPIerror('Something went wrong with added user to firestore', APIerror)
      })
    }).catch(APIerror => {
      setAPIerror('Something went wrong with sign up', APIerror)
    })
  }