title: ECMAScript 6 support in PhpStorm 2016
body: <p>I recently pulled in the latest Laravel 5.3. In the <code>gulp.js</code> file, there is the newer ES6 arrow function syntax:</p>
  
  <pre><code>elixir(mix =&gt; {
      mix.sass('app.scss')
         .webpack('app.js');
  });
  </code></pre>
  
  <p>PhpStorm 2016.2 shows this code error on that:</p>
  
  <pre><code>Expression statement is not assignment or call.
  </code></pre>
  
  <p>Additionally, the code auto-formatter mucks everything up when it encounters this because it sees it as an error.</p>
  
  <p>How do I get PhpStorm to stop showing that as an error?</p>