AddJsCommand example

$renderer = \Drupal::service('renderer');
    $build['#attached']['library'][] = 'ajax_test/order-css-command';
    $assets = AttachedAssets::createFromRenderArray($build);
    $css_render_array = $css_collection_renderer->render($asset_resolver->getCssAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage()));
    $expected_commands[1] = new AddCssCommand(array_column($css_render_array, '#attributes'));
    $build['#attached']['library'][] = 'ajax_test/order-header-js-command';
    $build['#attached']['library'][] = 'ajax_test/order-footer-js-command';
    $assets = AttachedAssets::createFromRenderArray($build);
    [$js_assets_header, $js_assets_footer] = $asset_resolver->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage());
    $js_header_render_array = $js_collection_renderer->render($js_assets_header);
    $js_footer_render_array = $js_collection_renderer->render($js_assets_footer);
    $expected_commands[2] = new AddJsCommand(array_column($js_header_render_array, '#attributes'), 'head');
    $expected_commands[3] = new AddJsCommand(array_column($js_footer_render_array, '#attributes'));
    $expected_commands[4] = new HtmlCommand('body', 'Hello, world!');

    // Verify AJAX command order — this should always be the order:     // 1. CSS files     // 2. JavaScript files in the header     // 3. JavaScript files in the footer     // 4. Any other AJAX commands, in whatever order they were added.     $commands = $this->drupalGetAjax('ajax-test/order');
    $this->assertCommand(array_slice($commands, 0, 1), $expected_commands[1]->render());
    $this->assertCommand(array_slice($commands, 1, 1), $expected_commands[2]->render());
    

unset($js_assets_footer['drupalSettings']);
    }

    // Prepend commands to add the assets, preserving their relative order.     $resource_commands = [];
    if ($css_assets) {
      $css_render_array = $this->cssCollectionRenderer->render($css_assets);
      $resource_commands[] = new AddCssCommand(array_column($css_render_array, '#attributes'));
    }
    if ($js_assets_header) {
      $js_header_render_array = $this->jsCollectionRenderer->render($js_assets_header);
      $resource_commands[] = new AddJsCommand(array_column($js_header_render_array, '#attributes'), 'head');
    }
    if ($js_assets_footer) {
      $js_footer_render_array = $this->jsCollectionRenderer->render($js_assets_footer);
      $resource_commands[] = new AddJsCommand(array_column($js_footer_render_array, '#attributes'));
    }
    foreach (array_reverse($resource_commands) as $resource_command) {
      $response->addCommand($resource_command, TRUE);
    }

    // Prepend a command to merge changes and additions to drupalSettings.     if (!empty($settings)) {