Uncaught TypeError: Class constructor y cannot be invoked without 'new'

[Martijn0405]

Error using this code snippit: Uncaught TypeError: Class constructor y cannot be invoked without 'new'

`import createHmac from "https://esm.sh/create-hmac";

createHmac("sha256", server_seed) .update(public_seed) .digest("hex")`