I totally agree with Steven
does work but
does not (result is FileNotFoundException because of a 'null' value is prepended to each file path).
So that's a bug (Took me hours to find the solution - so I am a bit annoyed.)
Also I found another issue (which fortunately did not take hours):
In the JSON config it is necessary to append trailing slashes to each path, otherwise the files are not found. So
does work for js/bar/foo.js, but
So the tool is great but it should be less error-prone.