Checkstyle is a more verbose report format structured for style checkers (eslint, jshint, etc). While these tools have junit outputters, junit treats warnings as failures. Checkstyle allows passing a build with warnings and only failing it on errors.
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Hello,
Thank you for your suggestion!
Our product team will take a look at this, although it’s unlikely we will change the report format as that would have a huge impact on our existing customers.
I think it would be great if our users could specify their own formatter! +1 to that 
Yes, please support checkstyle xml! much appreciated!