Since example

new JsonField('main_module', 'mainModule'),
            new ListField('cookies', 'cookies', JsonField::class),
            (new BoolField('allow_disable', 'allowDisable'))->addFlags(new Required()),
            new StringField('base_app_url', 'baseAppUrl', 1024),
            new ListField('allowed_hosts', 'allowedHosts', StringField::class),
            new IntField('template_load_priority', 'templateLoadPriority'),

            (new TranslationsAssociationField(AppTranslationDefinition::class, 'app_id'))->addFlags(new Required(), new CascadeDelete()),
            new TranslatedField('label'),
            new TranslatedField('description'),
            new TranslatedField('privacyPolicyExtensions'),
            (new TranslatedField('customFields'))->addFlags(new Since('6.4.1.0')),

            (new FkField('integration_id', 'integrationId', IntegrationDefinition::class))->addFlags(new Required()),
            new OneToOneAssociationField('integration', 'integration_id', 'id', IntegrationDefinition::class),

            (new FkField('acl_role_id', 'aclRoleId', AclRoleDefinition::class))->addFlags(new Required()),
            new OneToOneAssociationField('aclRole', 'acl_role_id', 'id', AclRoleDefinition::class),

            (new OneToManyAssociationField('customFieldSets', CustomFieldSetDefinition::class, 'app_id'))->addFlags(new CascadeDelete()),
            (new OneToManyAssociationField('actionButtons', ActionButtonDefinition::class, 'app_id'))->addFlags(new CascadeDelete()),
            (new OneToManyAssociationField('templates', TemplateDefinition::class, 'app_id'))->addFlags(new CascadeDelete()),
            (new OneToManyAssociationField('scripts', ScriptDefinition::class, 'app_id'))->addFlags(new CascadeDelete())->removeFlag(ApiAware::class),
            (

    protected function defineFields(): FieldCollection
    {
        return new FieldCollection(
            [
                (new StringField('string_field', 'stringField'))->addFlags(new ApiAware()),
                (new IntField('int_field', 'intField'))->addFlags(new ApiAware()),
                (new FloatField('float_field', 'floatField'))->addFlags(new ApiAware()),
                (new BoolField('bool_field', 'boolField'))->addFlags(new ApiAware()),
                (new IdField('id_field', 'idField'))->addFlags(new ApiAware()),
                (new StringField('i_am_a_new_field', 'i_am_a_new_field'))->addFlags(new ApiAware(), new Since('6.3.9.9')),
                (new ChildCountField())->addFlags(new ApiAware()),

                (new StringField('required_field', 'requiredField'))->addFlags(new ApiAware(), new Required()),
                (new StringField('read_only_field', 'readOnlyField'))->addFlags(new ApiAware(), new WriteProtected()),
                (new StringField('runtime_field', 'runtimeField'))->addFlags(new ApiAware(), new Runtime()),
            ]
        );
    }
}

    protected function defineFields(): FieldCollection
    {
        return new FieldCollection(
            [
                (new StringField('string_field', 'stringField'))->addFlags(new ApiAware()),
                (new IntField('int_field', 'intField'))->addFlags(new ApiAware()),
                (new FloatField('float_field', 'floatField'))->addFlags(new ApiAware()),
                (new BoolField('bool_field', 'boolField'))->addFlags(new ApiAware()),
                (new IdField('id_field', 'idField'))->addFlags(new ApiAware()),
                (new StringField('i_am_a_new_field', 'i_am_a_new_field'))->addFlags(new ApiAware(), new Since('6.3.9.9')),
                (new ChildCountField())->addFlags(new ApiAware()),

                (new StringField('required_field', 'requiredField'))->addFlags(new ApiAware(), new Required()),
                (new StringField('read_only_field', 'readOnlyField'))->addFlags(new ApiAware(), new WriteProtected()),
            ]
        );
    }
}

return [
            'position' => 0,
        ];
    }

    protected function defineFields(): FieldCollection
    {
        return new FieldCollection([
            (new IdField('id', 'id'))->addFlags(new ApiAware(), new PrimaryKey(), new Required()),
            (new FloatField('tax_rate', 'taxRate'))->addFlags(new ApiAware(), new Required(), new SearchRanking(SearchRanking::HIGH_SEARCH_RANKING)),
            (new StringField('name', 'name'))->addFlags(new ApiAware(), new Required(), new SearchRanking(SearchRanking::HIGH_SEARCH_RANKING)),
            (new IntField('position', 'position'))->addFlags(new Required(), new Since('6.4.0.0'), new ApiAware()),
            (new CustomFields())->addFlags(new ApiAware()),
            (new OneToManyAssociationField('products', ProductDefinition::class, 'tax_id', 'id'))->addFlags(new RestrictDelete(), new ReverseInherited('tax')),
            (new OneToManyAssociationField('rules', TaxRuleDefinition::class, 'tax_id', 'id'))->addFlags(new RestrictDelete()),
            (new OneToManyAssociationField('shippingMethods', ShippingMethodDefinition::class, 'tax_id', 'id'))->addFlags(new RestrictDelete()),
        ]);
    }
}

protected function getParentDefinitionClass(): string
    {
        return AppDefinition::class;
    }

    protected function defineFields(): FieldCollection
    {
        return new FieldCollection([
            (new StringField('label', 'label'))->addFlags(new Required()),
            new LongTextField('description', 'description'),
            new LongTextField('privacy_policy_extensions', 'privacyPolicyExtensions'),
            (new CustomFields())->addFlags(new Since('6.4.1.0')),
        ]);
    }
}

new OneToManyAssociationField('conditions', RuleConditionDefinition::class, 'rule_id', 'id'))->addFlags(new CascadeDelete()),

            // Reverse Associations not available in sales-channel-api             (new OneToManyAssociationField('productPrices', ProductPriceDefinition::class, 'rule_id', 'id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PRODUCT_AREA)),
            (new OneToManyAssociationField('shippingMethodPrices', ShippingMethodPriceDefinition::class, 'rule_id', 'id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::SHIPPING_AREA)),
            (new OneToManyAssociationField('shippingMethodPriceCalculations', ShippingMethodPriceDefinition::class, 'calculation_rule_id', 'id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::SHIPPING_AREA)),
            (new OneToManyAssociationField('shippingMethods', ShippingMethodDefinition::class, 'availability_rule_id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::SHIPPING_AREA)),
            (new OneToManyAssociationField('paymentMethods', PaymentMethodDefinition::class, 'availability_rule_id', 'id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PAYMENT_AREA)),
            (new OneToManyAssociationField('personaPromotions', PromotionDefinition::class, 'persona_rule_id', 'id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PROMOTION_AREA)),
            (new OneToManyAssociationField('flowSequences', FlowSequenceDefinition::class, 'rule_id', 'id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::FLOW_AREA)),
            (new OneToManyAssociationField('taxProviders', TaxProviderDefinition::class, 'availability_rule_id', 'id'))->addFlags(new RestrictDelete(), new Since('6.5.0.0')),

            new ManyToManyAssociationField('tags', TagDefinition::class, RuleTagDefinition::class, 'rule_id', 'tag_id'),

            // Promotion References             (new ManyToManyAssociationField('personaPromotions', PromotionDefinition::class, PromotionPersonaRuleDefinition::class, 'rule_id', 'promotion_id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PROMOTION_AREA)),
            (new ManyToManyAssociationField('orderPromotions', PromotionDefinition::class, PromotionOrderRuleDefinition::class, 'rule_id', 'promotion_id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PROMOTION_AREA)),
            (new ManyToManyAssociationField('cartPromotions', PromotionDefinition::class, PromotionCartRuleDefinition::class, 'rule_id', 'promotion_id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PROMOTION_AREA)),
            (new ManyToManyAssociationField('promotionDiscounts', PromotionDiscountDefinition::class, PromotionDiscountRuleDefinition::class, 'rule_id', 'discount_id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PROMOTION_AREA)),
            (new ManyToManyAssociationField('promotionSetGroups', PromotionSetGroupDefinition::class, PromotionSetGroupRuleDefinition::class, 'rule_id', 'setgroup_id'))->addFlags(new RestrictDelete(), new RuleAreas(RuleAreas::PROMOTION_AREA)),
        ]);
    }
}