Problem with typescript while extending user type

[manuelsechi]

Question 💬

Hello, I extended the session returned in the callBack with some additional property from the db:

callbacks: { async session({ session, token, user }) { // Send properties to the client, like an access_token from a provider. session.user = { id: user.id, email: user.email, isAdmin: user.isAdmin, }; return session; } }

and I added them to next-auth.d.ts declare module "next-auth" { interface Session { user: { id: string; email: string; isAdmin: boolean; }; } }

unfortunatelly when building I am still getting an error, for the isAdmin field only. The others are fine: Type error: Property 'isAdmin' does not exist on type 'User | AdapterUser' Am I doing it correctly? I am also starting to wonder if this is the correct way to expose additional properties in the session. thanks

How to reproduce ☕️

• Add a boolean field to the user collection in mongo
• modify the user session as explaned above
• run `npm run build'

Contributing 🙌🏽

No, I am afraid I cannot help regarding this

[balazsorban44]

https://next-auth.js.org/getting-started/typescript

https://next-auth.js.org/getting-started/example#extensibility

[manuelsechi]

I am using an adapter (mongo) so I can't use JWT https://next-auth.js.org/configuration/options#session

Also I am basing my configurartion on this: https://next-auth.js.org/getting-started/typescript#module-augmentation

This is all working, I just don't get how to typehint the property isAdmin: user.isAdmin

[balazsorban44]

using JWT is not a requirement for type safety. Mentioned in the docs under https://next-auth.js.org/getting-started/typescript#popular-interfaces-to-augment you need to augment the User interface for correct typing on the user object.