# File lib/generators/ember/bootstrap_generator.rb, line 17
      def inject_ember
        begin
          if javascript_engine == 'es6'
            inject_into_application_file('es6') # Don't use `.module.es6`.
          else
            inject_into_application_file(engine_extension)
          end
        rescue Exception
          inject_into_application_file('js')
        end
      end