extend in shoes.rb

#main.rb:
require 'helper'
Shoes.app do
  extend Helper
  @stack = stack do
    para 'I am the first!'
  end
  helper_method(@stack,10)
end

#helper.rb:
module Helper
  def helper_method(target,how_many)
    how_many.times do |i|
      target.append { para 'odelay' }
    end
  end
end