const client = useSupabaseClient()await client.auth.signIn({...})npm install @nuxtjs/supabase --save-dev to install supabase. I Couldn't figure out why client.auth.signIn({...}) throws the error that auth.signIn is not a function and finally downgraded the version to "@nuxtjs/supabase": "^0.1.4",. Now everything works just fine.