title: WebStorm not recognising Mocha describe() and it()
body: <p>I admit that I'm being pedantic here.  I have a Mocha test in WebStorm and WebStorm is complaining about <code>describe()</code> and <code>it()</code> not being a function type.</p>
  
  <p><a href="https://i.stack.imgur.com/bnnYX.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/bnnYX.jpg" alt="Method expression is not of Function type"></a></p>
  
  <p>I have the <code>mocha-definitelyTyped</code> library downloaded, and added to the <code>tests</code> folder.</p>
  
  <p><a href="https://i.stack.imgur.com/MFjEa.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/MFjEa.jpg" alt="Scopes"></a></p>
  
  <p>Running Mocha is fine.  Why is WebStorm not resolving the <code>describe</code> and <code>it</code> methods?</p>