Corrige les défauts trouvés par PHPStan.

src/php/Models/Types/Objects/Property.php

@@ -195,6 +195,6 @@ class Property implements \IteratorAggregate, \JsonSerializable
      */
     public static function createIdentifier(string $name, string $description, Type $type)
     {
-        return new static ($name, $description, $type, true, false, true);
+        return new self($name, $description, $type, true, false, true);
     }
 }

src/php/Models/Types/Reference.php

@@ -22,6 +22,8 @@ declare(strict_types=1);
 
 namespace Irstea\NgModelGeneratorBundle\Models\Types;
 
+use Irstea\NgModelGeneratorBundle\Exceptions\DomainException;
+
 /**
  * Class Ref.
  */
@@ -71,6 +73,8 @@ class Reference extends AbstractType implements Deferred
                 return $this;
             case self::RESOLVED:
                 return $this->target;
+            default:
+                throw new DomainException('invalid reference state: ' . $this->state);
         }
     }