https://api.drupal.org/api/drupal/core%21modules%21layout_builder%21src%21Plugin%21Derivative%21FieldBlockDeriver.php/11.x
FieldBlockDeriver.php | Drupal API
phpdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21layout_builder%21src%21Plugin%21Derivative%21FieldBlockDeriver.php/property/FieldBlockDeriver%3A%3AentityTypeRepository/8.9.x
FieldBlockDeriver::$entityTypeRepository | Drupal API
drupalapi