title: Use gulp with angular2 - ES5 or ES6
body: <p>I've added angular 2 to my project and it works, but I want to add gulp.</p>
  
  <p>When I used target: ES5 in my package.json file then I received many errors and after reading this ( <a href="https://github.com/angular/angular/issues/7052" rel="nofollow">https://github.com/angular/angular/issues/7052</a> ) I added </p>
  
  <pre><code>  ///&lt;reference path="node_modules/angular2/typings/browser.d.ts"/&gt; 
  </code></pre>
  
  <p>to my boot.ts file and it works. When I changed ES5 to ES6 I don't need this line. Could somebody explain which one should I use ?</p>