How to return from Parse Cloud Function in Node.js

So my swift code right now to call the cloud functions this:

let sendEmail_CloudFunction = Cloud(functionJobName: "sendEmail", arguments: myParameters)
sendEmail_CloudFunction.runFunction() { result in
	switch result {
	case .success(let response):
		print("Response from cloud function: \(response)")
	case .failure(let error):
		assertionFailure("Error calling cloud function: \(error)")
	}
}

And the node.js cloud function is this:

    var args = request.params.arguments

    var mailTemplateName = args.mailTemplateName
    var mailSubject = args.mailSubject
    var mailFromAddress = args.mailFromAddress
    var mailRecipient = args.mailRecipient
    var mailVariables = args.mailVariables
    var mailReplyTo = args.mailReplyTo
    var mailAttachmentName = args.mailAttachmentName

	const mailgun = require("mailgun-js");
	const DOMAIN = 'xxxxxx';
	const mg = mailgun({apiKey: 'key', domain: DOMAIN});
	const data = {
		from: mailFromAddress,
		to: mailRecipient,
		subject: mailSubject,
		template: mailTemplateName,
		text: 'Testing some Mailgun mail!',
		'h:X-Mailgun-Variables': mailVariables
	};
	mg.messages().send(data)
	.then((res) => {
		console.log(res);
		console.log(`************************* Sending Mail - console.log - ${JSON.stringify(res)}`);
		return res;
	})
	.catch((err) => {
		console.error(err);	
		// console.log(`************************* Sending Mail - console.log - ${JSON.stringify(err)}`);
		return err;
	});

The return res is this format:

{"id":"<[email protected]>","message":"Queued. Thank you."}

But from the error, it looks like parse is expecting a ‘result’ : Int.

I have tried returning { result : 1} as JSON and returning just the result above, plus returning the result above with the result property added to the JSON, but none seem to work.

I guess the question is, what is parse expecting, or do I define what the response is, like when I used dataTaskPublisher and .decode with my own response struct.

I hope that helps to clarify my. question.

Thanks for the help!!