OffCanvasTestHooks.php

<?php

declare (strict_types=1);
namespace Drupal\off_canvas_test\Hook;

use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for off_canvas_test.
 */
class OffCanvasTestHooks {
    
    /**
     * Implements hook_page_attachments().
     */
    public function pageAttachments(array &$attachments) : void {
        // This library wraps around the Drupal.offCanvas.resetSize() method and
        // adds a special data-resize-done attribute to help functional JavaScript
        // tests use the off-canvas area when it is fully loaded and ready to be
        // interacted with. @see
        // \Drupal\Tests\system\Traits\OffCanvasTestTrait::waitForOffCanvasArea()
        $attachments['#attached']['library'][] = 'off_canvas_test/resize_helper';
    }

}