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

require "sorbet-runtime"
require "dependabot/file_fetchers"
require "dependabot/file_fetchers/base"
require "dependabot/devcontainers/utils"

module Dependabot
  module Devcontainers
    class FileFetcher < Dependabot::FileFetchers::Base
      extend T::Sig

      sig { override.params(filenames: T::Array[String]).returns(T::Boolean) }
      def self.required_files_in?(filenames)
        # There's
    
      def fetch_config_and_lockfile_from(directory)
        files = []

        config_name = Utils.expected_config_basename(directory)
        config_file = fetch_file_if_present(File.join(directory, config_name))
        return files unless config_file

        files << config_file

        lockfile_name = Utils.expected_lockfile_name(File.basename(config_file.name))
        lockfile = fetch_support_file(File.join(directory, lockfile_name))
        files << lockfile if lockfile

        files
      end