    # File lib/action_view/helpers/asset_tag_helper.rb, line 243
          def javascript_include_tag(*sources)
            options = sources.extract_options!.stringify_keys
            cache   = options.delete("cache")
            recursive = options.delete("recursive")

            if ActionController::Base.perform_caching && cache
              joined_javascript_name = (cache == true ? "all" : cache) + ".js"
              joined_javascript_path = File.join(JAVASCRIPTS_DIR, joined_javascript_name)

              unless File.exists?(joined_javascript_path)
                JavaScriptSources.create(self, @controller, sources, recursive).write_asset_file_contents(joined_javascript_path)
              end
              javascript_src_tag(joined_javascript_name, options)
            else
              JavaScriptSources.create(self, @controller, sources, recursive).expand_sources.collect { |source|
                javascript_src_tag(source, options)
              }.join("\n")
            end
          end