JS-Applescript to send iMessages

messenger.js

#!/usr/bin/env osascript -l JavaScript

function run(argv) {
  var to = argv[0];
  var msg = argv[1];
  console.log("Sending message", "'" + msg + "'", "to", to);
  messages = Application('Messages');

  var service;
  for (var i in messages.services) {
    var s = messages.services[i];
    var name = s.name();
    if (name == "SMS") {
        service = s;
        console.log("Sending via SMS");
        break;
    } else if (name.substring(0,2) == "E:") {
        service = s;
        console.log("Sending via iMessage");
        break;
    }
  }

  recip = service.buddies[to];
  messages.send(msg, {to: recip});
}

Hi, I just found this script. I tested but I got always this list of services:

service: E:myicloudemail
service: SMS
service: Google
service: rumbo.com
service: Bonjour

How can I check if the user is available only on SMS or also on iMessage?
Thanks