title: How to make Istanbul generate coverage for all of my source code?
body: <p>Currently Istanbul is only generating coverage for files that are used in my tests, which is okay, but seems to defeat the purpose of having coverage somewhat.</p>
  
  <p>I have no Istanbul configuration, and am invoking it via <code>npm test</code> with the following script string:</p>
  
  <p><code>$ istanbul cover _mocha -- -R dot --check-leaks --recursive test/</code></p>
  
  <p>Is there a way to generate coverage for all of my source code?</p>