The config factory.
Subclasses should use the self::config() method, which may be overridden to address specific needs when loading config, rather than this property directly. See \Drupal\Core\Form\ConfigFormBase::config() for an example of this.
Type: \Drupal\Core\Config\ConfigFactoryInterface
protected $configFactory;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormBase.php/property/FormBase::configFactory/8.1.x