Field widget

Let's now create that default license plate widget plugin we referenced in the annotation of the field type, which belongs in the Plugin/Field/FieldWidget namespace of our module:

namespace Drupal\license_plate\Plugin\Field\FieldWidget; 
 
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\Field\WidgetBase; 
 
/** 
 * Plugin implementation of the 'default_license_plate_widget' widget. 
 * 
 * @FieldWidget( 
 *   id = "default_license_plate_widget", 
 *   label = @Translation("Default license plate widget"), 
 *   field_types = { 
 *     "license_plate" 
 *   } 
 * ) 
 */ 
class DefaultLicensePlateWidget extends WidgetBase { 
 
  use StringTranslationTrait; 
} 

Again, we start by examining the annotation and class parents for just a bit. You will notice nothing particularly complicated, except maybe the...