src/Routing/FastRouteRouter.php
public function routes()
    {
        $routes = array_merge($this->routes, $this->collector->getData());

        return function (RouteCollector $collector) use ($routes) {
            foreach (array_filter($routes) as $route) {
                list($method, $uri, $handler) = (array) $route;

                $collector->addRoute($method, $uri, $handler);
            }
        };
    }
public function routes()
    {
        $routes = array_merge($this->routes, $this->collector->getData());

        return function (RouteCollector $collector) use ($routes) {
            foreach (array_filter($routes) as $route) {
                list($method, $uri, $handler) = (array) $route;

                $collector->addRoute($method, $uri, $handler);
            }
        };
    }
Returns a listing of routes available.

@return callable