Config

Solo\Application\Config is an immutable DTO with the application's configuration. See Configuration for the files it points to.

final readonly class Config

__construct()

public function __construct(
    string $basePath,
    string $routesPath,
    array $providers,
    array $middleware,
    ?string $routesCachePath = null,
)

Every parameter is promoted to a public readonly property of the same name:

Property	Type	Description
$basePath	string	Application root. Not used by the kernel; available to your services through Config in the container
$routesPath	string	PHP file that returns a callable receiving a Solo\Router\RouteCollector and the container. Found the way require finds files
$providers	array<class-string>	Classes with a public register(WritableContainerInterface $container) method, run in order
$middleware	array<MiddlewareInterface|callable|string>	Global middleware, outermost first: middleware instances, callables or container IDs
$routesCachePath	?string	Absolute path of a PHP file that keeps the built router, or null to build it on every boot. Delete the file whenever routes change

The constructor does not check the values: a missing routes file or an invalid provider makes the Application constructor throw.

use Solo\Application\Config;
use Solo\Application\RoutingErrorMiddleware;
use Solo\Application\RoutingMiddleware;

$config = new Config(
    basePath: __DIR__,
    routesPath: __DIR__ . '/app/routes.php',
    providers: [HttpServiceProvider::class],
    middleware: [RoutingErrorMiddleware::class, RoutingMiddleware::class],
    routesCachePath: __DIR__ . '/var/cache/routes.php',
);

$config->routesCachePath; // '/…/var/cache/routes.php'

Application registers the instance in the container as Solo\Application\Config.