CORS preflight returns 500 on Dart function (context.res.text() / .empty() not found)

Hey everyone 👋 I’m running a Dart cloud function, Every time I respond to a preflight (OPTIONS) request, I get a 500 internal error, and the logs show: NoSuchMethodError: Class 'RuntimeResponse' has no instance method 'text' or 'empty' I've treid these

TypeScript

return context.res.empty(status: 204, headers: headers);
return context.res.json({}, 204, headers);````

None of them seem to exist on the runtime’s context.res.
❓ So I’m wondering:
    •    Which context.res methods are actually available in the Dart 3.x Appwrite runtime?
    •    Is there an updated way to send a plain response with custom headers (e.g. for CORS preflight)?