src/Viserio/Component/Routing/Provider/RoutingServiceProvider.php
public static function createUrlGenerator(ContainerInterface $container): ?UrlGeneratorContract
    {
        if (! $container->has(UriFactoryInterface::class)) {
            return null;
        }

        return new UrlGenerator(
            $container->get(RouterContract::class)->getRoutes(),
            $container->get(ServerRequestInterface::class),
            $container->get(UriFactoryInterface::class)
        );
    }
public static function createUrlGenerator(ContainerInterface $container): ?UrlGeneratorContract
    {
        if (! $container->has(UriFactoryInterface::class)) {
            return null;
        }

        return new UrlGenerator(
            $container->get(RouterContract::class)->getRoutes(),
            $container->get(ServerRequestInterface::class),
            $container->get(UriFactoryInterface::class)
        );
    }
Create a url generator instance.

@param \Psr\Container\ContainerInterface $container

@return null|\Viserio\Component\Contract\Routing\UrlGenerator