Accessing DataGroup from iRulesLX

Is there a way to access a DataGroup from within iLX javascript? Thank you for helping out. Here is my sample code

"use strict"
var f5 = require("f5-nodejs");
var ilx = new f5.ILXServer();

console.log("Node.js process starting.");
var separator = "------------------------------------"

var plugin = new f5.ILXPlugin();
var dg = {};
plugin.on('initialized', function () {
    dg = plugin.getDataGroup('/Common/ilx-test-dg');
});
....

When I reload the workspace, the error I get in ltm logs is

var plugin = new f5.ILXPlugin();
            ^
TypeError: undefined is not a function
    at Object. (/var/sdm/plugin_store/plugins/:Common:twurl_114385_63/extensions/twurl-ext/index.js:8:14)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3