Main.js

process.stdin.resume();
process.stdin.setEncoding('utf8');
// Here your code !

const NmlModel = (()=>{
  var text;
  var type;
  var properties;
  return class {
    
  }
})()

var n = new NmlModel();
n.text = "今は昔"
n.type = "Standard"
n.properties = "null"
example(n);

function example(nml){
    console.log("テキスト:"+nml.text);
    console.log("タイプ:"+nml.type);
    console.log("プロパティ:"+nml.properties);
}