interface ServiceProviderInterface

interface ServiceProviderInterface extends ContainerInterface {
    
    /**
     * @return T
     */
    public function get(string $id) : mixed;
    public function has(string $id) : bool;
    
    /**
     * Returns an associative array of service types keyed by the identifiers provided by the current container.
     *
     * Examples:
     *
     *  * ['logger' => 'Psr\Log\LoggerInterface'] means the object provides a service named "logger" that implements Psr\Log\LoggerInterface
     *  * ['foo' => '?'] means the container provides service name "foo" of unspecified type
     *  * ['bar' => '?Bar\Baz'] means the container provides a service "bar" of type Bar\Baz|null
     *
     * @return array<string, string> The provided service types, keyed by service names
     */
    public function getProvidedServices() : array;

}