instance method paths

# File railties/lib/rails/engine/configuration.rb, line 71
      def paths
        @paths ||= begin
          paths = Rails::Paths::Root.new(@root)

          paths.add "app",                 eager_load: true,
                                           glob: "{*,*/concerns}",
                                           exclude: ["assets", javascript_path]
          paths.add "app/assets",          glob: "*"
          paths.add "app/controllers",     eager_load: true
          paths.add "app/channels",        eager_load: true
          paths.add "app/helpers",         eager_load: true
          paths.add "app/models",          eager_load: true
          paths.add "app/mailers",         eager_load: true
          paths.add "app/views"

          # If you add more lib subdirectories here that should not be managed
          # by the main autoloader, please update the config.autoload_lib call
          # in the template that generates config/application.rb accordingly.
          paths.add "lib",                 load_path: true
          paths.add "lib/assets",          glob: "*"
          paths.add "lib/tasks",           glob: "**/*.rake"

          paths.add "config"
          paths.add "config/environments", glob: -"#{Rails.env}.rb"
          paths.add "config/initializers", glob: "**/*.rb"
          paths.add "config/locales",      glob: "**/*.{rb,yml}"
          paths.add "config/routes.rb"
          paths.add "config/routes",       glob: "**/*.rb"

          paths.add "db"
          paths.add "db/migrate"
          paths.add "db/seeds.rb"

          paths.add "vendor",              load_path: true
          paths.add "vendor/assets",       glob: "*"

          paths.add "test/mailers/previews", autoload: true

          paths
        end
      end