You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rack.rb
    path of file: ./repos/heroku-buildpack-ruby/lib/language_pack
    
    the code of the file until where you have to start completion: require "language_pack"
require "language_pack/ruby"

# Rack Language Pack. Thi
    
  def default_process_types
    # let's special case thin here if we detect it
    web_process = bundler.has_gem?("thin") ?
      "bundle exec thin start -R config.ru -e $RACK_ENV -p ${PORT:-5000}" :
      "bundle exec rackup config.ru -p ${PORT:-5000}"

    super.merge({
      "web" => web_process
    })
  end