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: delta.rb
    path of file: ./repos/coverband/lib/coverband/collectors
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Coverband
  module Collectors
    class Delta
      @@previous_coverage = {}
      @@stubs = {}

      attr_reader :current_coverage

      def initialize(current_coverage)
        @current_coverage = current_coverage
      end

      class RubyCoverage
       
    
      def transform_oneshot_lines_results(results)
        results.each_with_object({}) do |(file, coverage), new_results|
          ###
          # Eager filter:
          # Normally I would break this out into additional methods
          # and improve the readability but this is in a tight loop
          # on the critical performance path, and any refactoring I come up with
          # would slow down the performance.
          ###
          next unless @@ignore_patterns.none? { |pattern| file.match(pattern) } &&
            file.start_with?(@@project_directory)

          @@stubs[file] ||= ::Coverage.line_stub(file)
          transformed_line_counts = coverage[:oneshot_lines].each_with_object(@@stubs[file].dup) { |line_number, line_counts|
            line_counts[line_number - 1] = 1
          }
          new_results[file] = transformed_line_counts
        end
      end
    end