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: configuration.rb
    path of file: ./repos/pages-gem/lib/github-pages
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "securerandom"

module GitHubPages
  # Sets and manages Jekyll configuration defaults and overrides
  class Configuration
    # Backward compatability of constants
    DEFAULT_PLUGINS     = GitHubPages::Plugins::DEFAULT_PLUGINS
    PLUGIN_WHITELIST    = GitHubPages::Plugins::PLUGIN_WHITELIST
    DEVELOPMENT_PLUGINS = Git
    
      def configure_plugins(config)
        # Ensure we have those gems we want.
        config["plugins"] = Array(config["plugins"]) | DEFAULT_PLUGINS

        # To minimize errors, lazy-require jekyll-remote-theme if requested by the user
        config["plugins"].push("jekyll-remote-theme") if config.key? "remote_theme"

        return unless development?

        if disable_whitelist?
          config["whitelist"] = config["whitelist"] | config["plugins"]
        end