Exporting constants causes karma to crash and fail silently

[ccampbell]

Im not sure this is specifically related to this plugin.

Karma config is similar to the one in your README.

To reproduce

1. Create a test file test/something.js that looks like this:

   import { Something } from '../src/something';
   
   const expect = chai.expect;
   
   describe('Something', () => {
       it('Should exist', () => {
           expect(Something).to.exist;
       });
   });

2. Create module src/something.js that looks like this:

   export function Something() {}
   export const SOME_CONST = 123;

Then run karma with PhantomJS, and you will notice that it fails silently. If you take out this plugin from your karma config, it will work correctly. It also works fine if you comment out this line:

// export const SOME_CONST = 123;

It took me a while to trace it down this far. Let me know if I can help further

[Victorystick]

@ccampbell See this PR gotwarlost/istanbul#507.

[artberri]

Thank you @Victorystick for your help!