Fix generated type for nullable custom scalars

[11k]

Nullable shorthand (?Type) is only valid for a single type. When no mapping is defined for a custom scalar, it resolves to multiple native scalar types, so nullable output must be represented as an explicit union that includes null.

Schema

type Video {
  createdAt: Time
}

Before

final class Video
{
    // Syntax error
    public ?int|string|float|bool $createdAt {
        get => $this->createdAt ??= $this->data['createdAt'] !== null ? $this->data['createdAt'] : null;
    }

    // ...
}

After

final class Video
{
    public null|int|string|float|bool $createdAt {
        get => $this->createdAt ??= $this->data['createdAt'] !== null ? $this->data['createdAt'] : null;
    }

    // ...
}

[ruudk]

Good one, thanks!

Keep them coming!