old_contents: /*global ko*/
  (function () {
      var viewModel = {
          dataSource: ko.observableArray()
      };
  
      for (var i = 1; i <= 10; i++) {
          var item = 'Item ' + '*'.repeat(i);
          viewModel.dataSource.push(item);
      }
  
      ko.applyBindings(viewModel, document.getElementById('application'));
  }());
  
new_contents: /*global ko*/
  (function () {
      var viewModel = {
          dataSource: ko.observableArray()
      };
  
      for (var i = 1; i <= 10; i++) {
          var item = 'Item ' + new Array(i + 1).join('*');
          viewModel.dataSource.push(item);
      }
  
      ko.applyBindings(viewModel, document.getElementById('application'));
  }());
  
subject: Remove ES6 dependency