Babel-plugin-istanbul how to ignore files?

Im using babel-plugin-istanbul and would like to ignore some files, I followed the instructions from the repository https://github.com/istanbuljs/babel-plugin-istanbul, but seems meteor doesn’t take them, I noticed on my terminal logs that it takes a .coverage.json, I also tried adding exclude there but still those files are taken on the coverage, could it be Im missing something?

Thanks a lot!