https://api.drupal.org/api/drupal/core%21modules%21system%21tests%21modules%21twig_theme_test%21src%21TwigThemeTestController.php/function/TwigThemeTestController%3A%3AattachLibraryRender/8.9.x
function TwigThemeTestController::attachLibraryRender | Drupal API
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