title: Code Coverage for Typescript
body: <p>We've just started a project in Typescript and we need to get code coverage figures.</p>
  
  <p>Our existing JavaScript projects use Instanbul in Grunt for coverage. We are unsure how to replicate this for TypeScript.</p>
  
  <p>Are there any tools for generating code coverage from the TypeScript code itself?
  Or do we run the Istanbul (or similar) tool against the generated JavaScript code.</p>