title: Mocha's describe "require() is missing" in WebStorm 11
body: <p>I've just installed WebStorm 11 and created a new project, however WebStorm is saying that a <code>require()</code> is needed for the <code>describe</code> method:</p>
  
  <p><a href="https://i.stack.imgur.com/q9OFK.jpg"><img src="https://i.stack.imgur.com/q9OFK.jpg" alt="require() call is missing"></a></p>
  
  <p>I've added the definitely-types mocha library and the scope is for the test directory (which this file is in).</p>