A scalastyle linter that we have been testing internally for some time.
The implementation doesn't depend on sbt or a wrapper script.

Add a scalastyle linter with a configuration pointing to the scalastyle files and break a scalastyle rule.

Example configuration:

{
  "linters": {
    "scalastyle": {
      "type": "scalastyle",
      "scalastyle.config": "support/scalastyle/scalastyle-config.xml",
      "scalastyle.jar": "support/scalastyle/scalastyle_2.11-0.6.0-batch.jar",
      "include": "(\\.scala$)"
    }
  }
}