Resolve "Refactor ServiceModule::checkComponents()"

Closes #20

classes/modules/ServiceModule.php

@@ -35,8 +35,10 @@ final class ServiceModule implements ModuleInterface
      * @param $extension
      * @param $conf
      * @param $lodspk
+     *
+     * @return array
      */
-    private function checkComponents($serviceName, $arguments, $extension, $conf, $lodspk)
+    private function checkComponents($serviceName, $arguments, $extension, $conf, $lodspk): array
     {
 
         if (file_exists(