Using Sinatra Asset Snack

gistfile1.rb

require 'sinatra/asset_snack'

class App < Sinatra::Base
  register Sinatra::AssetSnack
  asset_map '/javascript/application.js', ['assets/js/**/*.js', 'assets/js/**/*.coffee']
  asset_map '/stylesheets/application.css', ['assets/stylesheets/**/*.css', 'assets/stylesheets/**/*.scss']

  get '/' do
    erb :index
  end
end