private function getStandardTypes(): array
    {
        $standard = [
            // Scalars
            BooleanType::class,
            FloatType::class,
            IDType::class,
            IntType::class,
            StringType::class,
            AnyType::class,
            DateTimeType::class,

            // Directives
            Deprecation::class,
        ];

        return \array_merge($standard, $this->additionalTypes);
    }