Lucia, the authentication library for SvelteKit, just had a complete overhaul! It now uses session tokens instead of JWTs, and the update improves the APIs overall. I've also rebuilt the docs from
How to do authentication in Svelte using Stores?
Revamped Auth Helpers for Supabase (with SvelteKit support)
Supabase Auth with SvelteKit | Supabase Docs
DIY Authentication and Authorization in SvelteKit 1 with SQLite | Philipp Hartenfeller
Firebase Authentication in Sveltekit! Full Stack App Pt. 1 - YouTube
How to add Magic Link to a SvelteKit application | Magic
GitHub - danawoodman/sveltekit-auth-example: An example SvelteKit app implementing a simple authentication system.