How to type polymorphic / dynamic attributes?

[P-James]

I've got a class Stage data where $type is a model from a polymorphic relationship.

class StageData extends Data
{
    public function __construct(
        public string $type_type,
        public int $index,
        public $type
    ) {
    }
}

I'm stuck trying to type this in the proper way. I've managed to implement it like below, but because of the missing type hint in the constructor, I get any in my typescript type.

class StageData extends Data
{
    public function __construct(
        public string $type_type,
        public int $index,
        public $type
    ) {
    }

    public static function fromModel($stage): static
    {
        $type = null;
        switch ($stage->type_type) {
            case TypeOne::MORPH_TYPE:
                $type = TypeOneData::from($stage->type);
                break;
            case TypeTwo::MORPH_TYPE:
                $type = TypeTwoData::from($stage->type);
                break;
        }

        return new self(
            type_type: $stage->type_type,
            index: $stage->index,
            type: $type
        );
    }
}

Is it possible to get the typescript type while keeping the dynamic property?

[rubenvanassche]

Take a look at this: https://spatie.be/docs/typescript-transformer/v2/usage/annotations#content-using-php-types-to-write-typescript

[P-James]

Can't believe I missed that. Thanks for your quick response!