class RuboCop::Cop::Style::EmptyLiteral

def offense_message(node)
  if offense_array_node?(node)
    format(ARR_MSG, current: node.source)
  elsif offense_hash_node?(node)
    format(HASH_MSG, current: node.source)
  elsif str_node(node) && !frozen_strings?
    format(STR_MSG, prefer: preferred_string_literal)
  end
end