Issue #3266160 by smustgrave, alex.skrypnyk, tannguyenhn, beatrizrodrigues,...

    // Call any pre-scaffold scripts that may be defined.

    $dispatcher = $this->composer->getEventDispatcher();

    $dispatcher->dispatch(self::PRE_DRUPAL_SCAFFOLD_CMD);

    $dispatcher->dispatchScript(self::PRE_DRUPAL_SCAFFOLD_CMD);

    // Fetch the list of file mappings from each allowed package and normalize

    // them.

    $gitIgnoreManager->manageIgnored($scaffold_results, $scaffold_options);

    // Call post-scaffold scripts.

    $dispatcher->dispatch(self::POST_DRUPAL_SCAFFOLD_CMD);

    $dispatcher->dispatchScript(self::POST_DRUPAL_SCAFFOLD_CMD);

  }

  /**

namespace Drupal\Tests\fixture\Composer\Plugin;

use Composer\EventDispatcher\Event;

use Composer\EventDispatcher\EventSubscriberInterface;

use Composer\Plugin\PluginInterface;

use Composer\Composer;

use Composer\IO\IOInterface;

use Composer\Script\Event;

use Drupal\Composer\Plugin\Scaffold\Handler;

/**

   * Implements pre Drupal scaffold cmd.

   */

  public static function preDrupalScaffoldCmd(Event $event): void {

    print 'Hello preDrupalScaffoldCmd' . PHP_EOL;

    $event->getIO()->write('Hello preDrupalScaffoldCmd');

  }

  /**

   * Implements post Drupal scaffold cmd.

   */

  public static function postDrupalScaffoldCmd(Event $event): void {

    print 'Hello postDrupalScaffoldCmd' . PHP_EOL;

    $event->getIO()->write('Hello postDrupalScaffoldCmd');

  }

  /**