title: nativescript fails to run with an exit code of 0
body: <p>I've started having problems getting nativescript to run, and the error message is truly confusing, since it is exit code 0.</p>
  
  <pre><code>tns run android
  Searching for devices...
  NativeScript Environment:  tns run &lt;platform&gt; --env not provided.
  NativeScript Environment:  Environment vars not changed
  Preparing project...
  File change detected. Starting incremental webpack compilation...
  
  webpack is watching the files…
  
  Executing webpack failed with exit code 0.
  </code></pre>
  
  <p>I've tried the usual suspect list of remedies: uninstall/reinstall nativescript, platforms, etc.  <code>tns doctor</code> gives me a full green-checkmark bill of clean health.
  This just started happening today. I've been using it without this problem for over a year of development prior.<br>
  What should I try next?</p>