commonJS errors

I'm getting 3 errors here,one is missing use strict statement and the other TWO errors combine var statment,now 2 years ago i never saw this errors,things have changed

// win1.js
function Window(){
  var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
  });
  var tab1 = Titanium.UI.createTab({  
    icon:'KS_nav_views.png',
    title:'Tab 1',
    window:win1
  });
 
  var label1 = Titanium.UI.createLabel({
    color:'#999',
    text:'I am Window 1',
    font:{fontSize:20,fontFamily:'Helvetica Neue'},
    textAlign:'center',
    width:'auto'
  });
 
  win1.add(label1);
 
  return win1;
}
 
module.exports = Window;