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: determine_outdatedness.rb
    path of file: ./repos/nanoc/nanoc-core/lib/nanoc/core/compilation_stages
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Nanoc
  module Core
    module CompilationStages
      class DetermineOutdatedness <
    
        def run
          outdated_items = select_outdated_items
          outdated_reps = reps_of_items(outdated_items)

          store_outdated_reps(outdated_reps)

          outdated_items
        end