title: Typescript 'Cannot find module' with declaration file
body: <p>I'm using typescript with react and need to provide typings for a third party library called <code>react-sticky</code>. I don't want to publish a typings module, I just want to write the typings and include them in my codebase, but I'm running into trouble. Here's the setup</p>
  
  <p><code>App.tsx</code></p>
  
  <pre><code>/// &lt;reference path="./typings/index.d.ts" /&gt;
  /// &lt;reference path="./typings/react-sticky.d.ts" /&gt;
  import * as React from "react"
  import { Sticky, StickyContainer } from "react-sticky"
  
  const App: React.StatelessComponent&lt;{}&gt; = () =&gt; {
      return &lt;StickyContainer&gt;
          &lt;Sticky&gt;
          &lt;h1&gt;Hello World&lt;/h1&gt;
          &lt;/Sticky&gt;
      &lt;/StickyContainer&gt;
  }
  </code></pre>
  
  <p><code>/typings/react-sticky.d.ts</code></p>
  
  <pre><code>/// &lt;reference path="./modules/react/index.d.ts" /&gt;
  import * as React from "react"
  
  declare module "react-sticky" {
  
      export var StickyContainer: React.Component&lt;{}, {}&gt;
      export interface StickyProps {
          stickyStyle?: any
          stickyClassName?: string
          topOffset?: number
          bottomOffset?: number
          className?: string
          style?: {}
          onStickyStateChange?: () =&gt; void
          isActive?: boolean
      }
      export var Sticky: React.Component&lt;StickyProps, {}&gt;
  
  }
  </code></pre>
  
  <p><code>typings/index.d.ts</code></p>
  
  <pre><code>/// &lt;reference path="modules/react-dom/index.d.ts" /&gt;
  /// &lt;reference path="modules/react/index.d.ts" /&gt;
  /// &lt;reference path="react-sticky.d.ts" /&gt;
  </code></pre>
  
  <p>The error I'm getting is the following</p>
  
  <pre><code>App.tsx(3,41): error TS2307: Cannot find module 'react-sticky'.
  </code></pre>
  
  <p>Now, I'm new to Typescript, there are quite possibly multiple errors here, anyone know what I need to do?</p>