dependency injection

use Drupal\Core\Render\RendererInterface;

/**
 * Defines an interface for turning a render array into a string.
 */
protected RendererInterface $renderer;

/**
 * The form constructor.
 *
 * @param \Drupal\Core\Render\RendererInterface $renderer
 *   The renderer.
 */

use Drupal\Core\Cache\CacheTagsInvalidator;

...

/**
 * The cache tags invalidator.
 */
protected CacheTagsInvalidator $cacheTagsInvalidator;

/**
 * Constructs a form object.
 *
 * @param \Drupal\Core\Cache\CacheTagsInvalidator $cache_tags_invalidator
 *   The cache 

Before:

$moderators = \Drupal::entityQuery('user')
 ->condition('status', 1)
 ->condition('roles', $moderator_role)
 ->execute();

After:

use Drupal\Core\Mail\MailManagerInterface;

...

use Drupal\Core\Config\ConfigFactoryInterface;

...

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * The current route match.
 *
 * @var \Drupal\Core\Routing\RouteMatchInterface
 */
protected $routeMatch;

/**
 * Constructs a PrivatemsgMessageForm object.
 *
 * @param \Drupal\Core\En

use Drupal\Core\Logger\LoggerChannelFactoryInterface;

/**
 * Logger Factory.
 *
 * @var \Drupal\Core\Logger\LoggerChannelFactoryInterface
 */
protected $logger;

/**
 * Constructor.
 */
public 

use Drupal\Core\State\StateInterface;
  /**
  * The state store.
  *
  * @var \Drupal\Core\State\StateInterface
  */
 protected $state;
  /**
  * Drush command constructor.
  *
  * @param \Drupal\Core\State\StateInterface $state
  *   T

use Drupal\Core\Messenger\MessengerInterface;
/**
 * The messenger service.
 *
 * @var \Drupal\Core\Messenger\MessengerInterface
 */
protected $messenger;
/**
 * The form constructor.
 *
 * @param \Drupal\Core\Messenger\MessengerInterfa

use GuzzleHttp\ClientInterface;
/**
 * An http client.
 *
 * @var \GuzzleHttp\ClientInterface
 */
protected $httpClient;
 /**
 * The form constructor.
 *
 * @param \GuzzleHttp\ClientInterface $http_client
 *   Guzzle client interface.
 */
public