GraphQL custom scalar types should be type hint mixed in PHP

[vuongxuongminh]

Is your feature request related to a problem? Please describe.

My GraphQL server define custom scalar type json's an array like an example at https://graphql.org/learn/schema/#scalar-types but currently generator generate executor method args with PHP type hint's string so I can not pass an array arg to executor.

Example with graphql operation:

query CheckPermissions($userId: Int!, $permissions: json!) {
    permissions_check(permissions: $permissions, user_id: $userId)
}

Will generate an executor method:

    public static function execute(int $userId, string $permissions): CheckPermissions\CheckPermissionsResult
    {
        return self::executeOperation(...func_get_args());
    }

Describe the solution you'd like

In my case above, $permissions should be type hint with mixed type so I can pass an array to it.

For custom scalar types, I think Spawnia\Sailor\Codegen\PhpType::forScalar method should be return mixed type for PHP8 and above and return empty string (mixed too) for lower PHP versions.

[spawnia]

Custom scalars are supported in the latest version, see https://github.com/spawnia/sailor#custom-types

[vuongxuongminh]

Good news! Thank you.