'twig_extension_test_filter', '#message' => 'Every animal is not a mineral.', '#safe_join_items' => [ 'will be escaped', $this->t('will be markup'), ['#markup' => 'will be rendered'], ], ]; } /** * Menu callback for testing Twig functions in a Twig template. */ public function testFunctionRender() { return ['#theme' => 'twig_extension_test_function']; } }