title: Importing in library definition (flow-typed/) doesn't work in flow (static type checker)
body: <p>Importing in library defintion file (flow-typed/lib.js) doesn't seem to work correclty.</p>
  
  <p>Directory structure in <code>flow-typed</code>:</p>
  
  <pre><code>flow-typed
     | - lib.js
     | - some-types.js
  </code></pre>
  
  <p>what doesnt work:</p>
  
  <pre><code>// in flow-typed/lib.js
  import type {SomeTypes} from './some-types'
  // use SomeTypes
  // SomeTypes doesn't type check and silently fails
  </code></pre>
  
  <p>what works:</p>
  
  <pre><code>// in flow-typed/lib.js
  type SomeTypes = {} // literally copy paste from some-type
  // use SomeTypes
  // works now
  </code></pre>