Add the following top-level init method to the main.dart file. How create: DartFrog advanced docs

And add

  SupabaseSource.initialize(SupabaseClient('supabaseUrl', 'supabaseKey'));

Use

  SupabaseSource.instance.db.from('table').select();

Supbase dart docs: Supbase dart docs

Also check full docs for shoko_api_core: shoko api core