title: Migrating AngularJS to Angular 4,5 (with DEMO)
body: <p>I am looking into ways of migration a current Angular 1 project to Angular 4.</p>
  
  <p>Options are <strong>ng-forward</strong>, <strong>ngUpgrade</strong> or <strong>rewrite</strong>.</p>
  
  <p>I am thinking on rewriting it but with a twist.</p>
  
  <ul>
  <li>I keep the current application</li>
  <li>Start writing the new one parallel to it</li>
  <li>All new NG4 rewrites, I want to use ... so bit by bit in other words.</li>
  </ul>
  
  <p>Has anyone attempted this or know a better way?</p>