Looks pretty cool, but it supports a very limited set of styles. It's not really comparable to rubocop, nor is it able to enforce conformance to any of the popular style guides in full. In fact, at a glance it appears to make decisions about your code that fly in the face of many of the popular style guides (double spaces for indentation and no freaking semicolons [seriously?]).

The auto-formatting option does not clarify which of these it enforces, and one of these isn't even a style rule (always handle the err parameter in node.js).

To really rub it in, it also makes it very clear that there is no configuration! Deal with it in a way that strikes me as uncomfortably smug.

I appreciate you sharing, and I could see this being useful for running over a codebase. I might use it to convert all tabs to double spaces (since that's my preference anyway) and check to make sure there are no unused declared variables, but that might be the extent of it. But to be honest, reading the documentation here has made me really want to see a community-developed tool inspired by Rubocop.