class Opal::Nodes::UndefNode

def compile
  children.each do |child|
    value = child[1]
    statements = []
    if child[0] == :js_return
       value = value[1]
       statements << expr(s(:js_return))
    end
    statements << "Opal.udef(self, '$#{value.to_s}');"
    if children.length > 1 && child != children.first
      line *statements
    else
      push *statements
    end
  end
end