upgrade_status_test_library.module in Upgrade Status 8.3
File
tests/modules/upgrade_status_test_library/upgrade_status_test_library.module
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<?php
function upgrade_status_test_library_preprocess_html(&$variables) {
$variables['#attach']['libraries'] = [
'upgrade_status_test_library/deprecated_library',
];
$variables['#attach']['libraries'][] = 'upgrade_status_test_twig/deprecated_library';
$library = 'deprecated_library';
$variables['#attach']['libraries'][] = "upgrade_status_test_library/{$library}";
}