class RuboCop::Formatter::JSONFormatter

def metadata_hash
  {
    rubocop_version: RuboCop::Version::STRING,
    ruby_engine:     RUBY_ENGINE,
    ruby_version:    RUBY_VERSION,
    ruby_patchlevel: RUBY_PATCHLEVEL.to_s,
    ruby_platform:   RUBY_PLATFORM
  }
end