I have a Django application with authenticated (logged-in) users.
I have another (Svelte) application using Auth.js (https://authjs.dev) for authentication, currently set up with github/facebook/linkedin.
Now I want to send a user from the Django application to the Svelte application, and automagically (i) create the user in the Svelte application if they don't exist, and (ii) log them in to the Svelte application.
I want the end-user experience to be like a regular redirect from one page to the other staying logged-in in both places.
I'm stuck at the part where the user arrives in the Svelte application and I need to create a session. Does Auth.js have any way of doing this without going through a "provider"?