The serverless backend with 'Deno' is hosted at Supabase as 'Edge Functions'. The frontend is hosted at Google Firebase.
supabase init
supabase start
supabase functions new hello-world
supabase functions serve hello-world --env-file ./supabase/.env.local
cp ./supabase/.env.local ./supabase/.env
supabase secrets set --env-file ./supabase/.env
supabase secrets list