src/Application.php
public function registerStackMiddleware($class)
    {
        if (func_num_args() === 0) {
            throw new \InvalidArgumentException("Missing argument(s) when calling registerStackMiddlerware");
        }

        if (! class_exists($class) && ! is_callable($class)) {
            throw new \InvalidArgumentException("{$class} not found or not callable");
        }

        call_user_func_array([$this->builder, "push"], func_get_args());
    }
public function registerStackMiddleware($class)
    {
        if (func_num_args() === 0) {
            throw new \InvalidArgumentException("Missing argument(s) when calling registerStackMiddlerware");
        }

        if (! class_exists($class) && ! is_callable($class)) {
            throw new \InvalidArgumentException("{$class} not found or not callable");
        }

        call_user_func_array([$this->builder, "push"], func_get_args());
    }
register stack middleware
@param string $class