Hi Marek!

Not sure if I get it but in general, I put reusable services in /core directory (and sub directories based on feature eg /core/auth or /core/user ) and I use providedIn: 'root' . So they are not in providers: [ ] of the CoreModule …

Then they can be injected in any component or service in the whole app as they are application wide singletons.

Hope that makes sense!