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: go_mod.rb
    path of file: ./repos/gitlabhq/app/models/blob_viewer
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module BlobViewer
  class GoM
    
    def package_name
      strong_memoize(:package_name) do
        next if blob.name != 'go.mod'
        next unless match = MODULE_REGEX.match(blob.data)

        match[:name]
      end
    end