logout.html

<!DOCTYPE html>
<html>

<head>
 <meta charset='utf-8'>
 <meta http-equiv='X-UA-Compatible' content='IE=edge'>
 <title>Sair</title>
 <meta name='viewport' content='width=device-width, initial-scale=1'>
 <script src="https://unpkg.com/@supabase/supabase-js@2"></script>
 <script src="clientsupabase.js"></script>
</head>

<body>
 <script>
  var client = ClientSubapase.getClient();
  const deslogar = async function () {
   const { error } = await client.auth.signOut();
   console.log(error);
   if (error == null) {
    window.location = 'login.html';
   }
  }
  deslogar();
 </script>
</body>

</html>