user object is undefined inside signIn callback of auth.js provider

[xoldd]

Environment

OS: Linux 6.4 Fedora Linux 38 (Workstation Edition)
Node: 18.17.0
Brave Browser: 115.1.56.20

Reproduction URL

https://codesandbox.io/p/sandbox/authjs-solidjs-hd4x9n

Describe the issue

In auth.js package the user object received as prop in signIn callback is undefined. This means we can't do custom checks on the user signing up or logging in, or mutate the user object for a client that is signing in for the first time(signing up), for example a populating a required database field with randomly generated value.

How to reproduce

Go to this link:- https://codesandbox.io/p/sandbox/authjs-solidjs-hd4x9n

Do the setup and all that. You will need to populate github client id and secret in .env file. After that click the sign in button and check the console. User object will be undefined.

Expected behavior

Go to this link:- https://codesandbox.io/p/sandbox/next-auth-nextjs-kwkj6s

Same thing as above but this time user object is logged normally and it isn't undefined.

So ultimately the next-auth package works while auth.js package doesn't.

[nikospapcom]

@balazsorban44 Any update on this? I have the same issue in nextjs app router with authjs installed
When I'm trying to sign in with a new user then the user object is undefined
if user already exist in the db then the user object is populated
is it normal?

[jerriclynsjohn]

I'm facing the exact same problem as well. I'm using "@auth/core": "^0.12.0" and "@auth/sveltekit": "^0.3.6"

[jerriclynsjohn]

@xoldyckk Your codesandbox links are not working. But I can confirm that this exists when using @auth/core and this is literally blocking me from implementing custom logic using the signIn callback.

[xoldd]

@jerriclynsjohn yeah updated them, now should point to correct sandboxes

[dit7ya]

I am facing the same issue, I used the profile object as a workaround but not sure if that is solid enough for accessing the sub.

[canastro]

Facing the same issue.

[jerriclynsjohn]

Someone from the core team should update this as common for all frameworks using @auth/core