Form/Items/TextItem.php
public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        $builder->add('placeholder', TextType::class, [
            'label' => 'Placeholder',
            'required' => false,
        ]);

        $builder->add('min', NumberType::class, [
            'label' => 'Min Length',
            'required' => false,
        ]);

        $builder->add('max', NumberType::class, [
            'label' => 'Max Length',
            'required' => false,
        ]);

        $builder->add('isSubject', CheckboxType::class, [
            'label' => 'Is Subject',
            'required' => false,
        ]);

        $builder->add('isFirstname', CheckboxType::class, [
            'label' => 'Is Firstname',
            'required' => false,
        ]);

        $builder->add('isName', CheckboxType::class, [
            'label' => 'Is Name',
            'required' => false,
        ]);
    }
public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        $builder->add('placeholder', TextType::class, [
            'label' => 'Placeholder',
            'required' => false,
        ]);

        $builder->add('min', NumberType::class, [
            'label' => 'Min Length',
            'required' => false,
        ]);

        $builder->add('max', NumberType::class, [
            'label' => 'Max Length',
            'required' => false,
        ]);

        $builder->add('isSubject', CheckboxType::class, [
            'label' => 'Is Subject',
            'required' => false,
        ]);

        $builder->add('isFirstname', CheckboxType::class, [
            'label' => 'Is Firstname',
            'required' => false,
        ]);

        $builder->add('isName', CheckboxType::class, [
            'label' => 'Is Name',
            'required' => false,
        ]);
    }
{@inheritdoc}