class RuboCop::Cop::Rails::UnknownEnv

def message(name)
  name = name.to_s.chomp('?')
  # DidYouMean::SpellChecker is not available in all versions of Ruby,
  # and even on versions where it *is* available (>= 2.3), it is not
  # always required correctly. So we do a feature check first. See:
  # https://github.com/rubocop/rubocop/issues/7979
  similar_names = if defined?(DidYouMean::SpellChecker)
                    spell_checker = DidYouMean::SpellChecker.new(dictionary: environments)
                    spell_checker.correct(name)
                  else
                    []
                  end
  if similar_names.empty?
    format(MSG, name: name)
  else
    format(MSG_SIMILAR, name: name, similar: similar_names.join(', '))
  end
end