class RuboCop::Cop::Style::MapCompactWithConditionalBlock

def on_send(node)
  map_and_compact?(node) do |block_argument_node, condition_node, return_value_node|
    return unless returns_block_argument?(block_argument_node, return_value_node)
    return if condition_node.parent.elsif?
    method = truthy_branch?(return_value_node) ? 'select' : 'reject'
    range = range(node)
    add_offense(range, message: format(MSG, method: method)) do |corrector|
      corrector.replace(
        range,
        "#{method} { |#{block_argument_node.source}| #{condition_node.source} }"
      )
    end
  end
end