2022 Code doesn't work anymore, very obsolete

Hello! I managed to run the sample code you provided on this tutorial
(https://github.com/FilledStacks/stacked-example) today, March, 3, 2022 4:59pm,
but it took me 3 hours to update and debug everything before a successful flutter run.
Everything is just very outdated.

I hope you can update the code samples because it's now obsolete :(

Things I did:
- updated plugins
- updated auto_route syntax
- migrated everything to null safe
- updated variables, null or required