AppendCommand

class \Drupal\Core\Ajax\InsertCommand implements \Drupal\Core\Ajax\CommandInterface, \Drupal\Core\Ajax\CommandWithAttachedAssetsInterface uses \Drupal\Core\Ajax\CommandWithAttachedAssetsTrait
- class \Drupal\Core\Ajax\AfterCommand extends \Drupal\Core\Ajax\InsertCommand
- class \Drupal\Core\Ajax\AppendCommand extends \Drupal\Core\Ajax\InsertCommand
  - class \Drupal\ajax_test\Ajax\AjaxTestCommandReturnPromise extends \Drupal\Core\Ajax\AppendCommand
- class \Drupal\Core\Ajax\BeforeCommand extends \Drupal\Core\Ajax\InsertCommand
- class \Drupal\Core\Ajax\HtmlCommand extends \Drupal\Core\Ajax\InsertCommand
- class \Drupal\Core\Ajax\PrependCommand extends \Drupal\Core\Ajax\InsertCommand
- class \Drupal\Core\Ajax\ReplaceCommand extends \Drupal\Core\Ajax\InsertCommand

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