class ChefCLI::PolicyfileCompiler

def remote_artifacts_graph
  @merged_graph ||=
    begin
      conflicting_cb_names = []
      merged = {}
      default_source.each do |source|
        merged.merge!(source.universe_graph) do |conflicting_cb_name, _old, _new|
          if (preference = preferred_source_for_cookbook(conflicting_cb_name))
            preference.universe_graph[conflicting_cb_name]
          elsif cookbook_could_appear_in_solution?(conflicting_cb_name)
            conflicting_cb_names << conflicting_cb_name
            {} # return empty set of versions
          else
            {} # return empty set of versions
          end
        end
      end
      handle_conflicting_cookbooks(conflicting_cb_names)
      merged
    end
end