TransformationFailureListener example

public function __construct(TranslatorInterface $translator = null)
    {
        $this->translator = $translator;
    }

    /** * @return void */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        if (!isset($options['constraints'])) {
            $builder->addEventSubscriber(new TransformationFailureListener($this->translator));
        }
    }

    public static function getExtendedTypes(): iterable
    {
        return [FormType::class];
    }
}