class RuboCop::Cop::Style::StringHashKeys

def on_pair(node)
  return unless string_hash_key?(node)
  return if receive_environments_method?(node)
  add_offense(node.key) do |corrector|
    symbol_content = node.key.str_content.to_sym.inspect
    corrector.replace(node.key, symbol_content)
  end
end