class Opal::Nodes::Args::ExtractPostArg


required post-argument from $post_args
This node is responsible for extracting a single

def compile 

def compile
  add_temp name
  line "#{name} = $post_args[0];"
  line "$post_args.splice(0, 1);"
  line "if (#{name} == null) {"
  line "  #{name} = nil"
  line "}"
end