I've had a pretty bad time trying to get code coverage with my cli tests. I've ended up using spawn() in my test cases due to most libraries using process.exit() / process.stdout.write() and console.log() (instead of picking one and sticking with it).

How are globals used in the vorpal codebase? Is it going to be easier to write my tests (and actually get code coverage with istanbul working)?

I like the site, and the API overview. The library looks nice!