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: lockfile_parser.rb
    path of file: ./repos/dependabot-core/npm_and_yarn/lib/dependabot/npm_and_yarn/file_parser
    
    the code of the file until where you have to start completion: # typed: true
# frozen_string_literal: true

require "dependabot/dependency_file"
require "dependabot/npm_and_yarn/file_parser"
require "dependabot/npm_and_yarn/helpers"

module Dependabot
  module NpmAndYarn
    class FileParser < Dependabot::FileParsers::Base
      class LockfileParser
        require "dependabot/npm_and_yarn/file_parser/yarn_lock"
        require "dependabot/npm_and_yarn/file_parser/pnpm_lock"
        require "dependabot/npm_and_yarn/file_parser/json_lock"

        def initialize(dependency_files:)
          @dependency_files = dependency_files
        end

        d
    
        def potential_lockfiles_for_manifest(manifest_filename)
          dir_name = File.dirname(manifest_filename)
          possible_lockfile_names =
            %w(package-lock.json npm-shrinkwrap.json pnpm-lock.yaml yarn.lock).map do |f|
              Pathname.new(File.join(dir_name, f)).cleanpath.to_path
            end +
            %w(yarn.lock pnpm-lock.yaml package-lock.json npm-shrinkwrap.json)

          possible_lockfile_names.uniq
                                 .filter_map { |nm| dependency_files.find { |f| f.name == nm } }
        end

        def parsed_lockfile(file)
          lockfile_for(file).parsed
        end

        def lockfile_for(file)
          @lockfiles ||= {}
          @lockfiles[file.name] ||= if [*package_locks, *shrinkwraps].include?(file)
                                      JsonLock.new(file)
                                    elsif yarn_locks.include?(file)
                                      YarnLock.new(file)
                                    else
                                      PnpmLock.new(file)
                                    end
        end