Keep track if the user is new in the session

[kettanaito]

Hey. Thank you for an awesome project!

In my application, I use NextAuth and GitHub login but the user needs to finish a setup step in order for the user record to be created in the database. Until they do, they are treated as a "guest" user, which I store in my token/session:

export default NextAuth({
  // the rest of GitHub auth.
  callbacks: {
    async jwt(token, user, account, profile) {
      if (profile?.login) {
        token.login = profile.login
      }

      if (account?.accessToken) {
        token.authToken = account?.accessToken
      }

      return token
    },
    async session(session, user) {
      if (session.user) {
        const { data } = await client.query({
          query: CHECK_USER_IS_NEW,
          variables: {
            login: user.login,
          },
        })

        session.user.login = user.login
        session.user.authToken = user.authToken
        session.user.isNewUser = !data.findServiceUser?.login
      }

      return session
    },
  },
})

Question

How do I update session.user.isNewUser on runtime from my client-side code?

The setup success is a clear event I can determine in my client-side code:

const handleSubmitSetup = () => {
  createUser().then(() => {
    // Safe to update the session here, no need to query the DB.
  })
}

It seems redundant and slow to update session.user.isNewUser on each session callback. That value is switched from false to true once, and will not change anymore.

What I've done

Related issues

I've read through a bunch of issues but haven't found a suggestion that'd suit my use case:

• What is the best way to extend a user profile? #312
• Is mutating the session possible? #371
• Is there a sane way to store tokens created by a service? #325

I've also tried mutating the session object in hope to get that mutated value in the session callback:

const [session] = getSession()

createUser().then(() => {
  session.user.isNewUser = false
})

There is no way to access the overridden value of isNewUser in the session callback, it remains true.