gistfile1.txt

@Injectable({
  providedIn: 'root',
  useClass: ServiceClientImpl,
})
class AbstractService {
  static ngInjectableDef = {
    factory: () => new ServiceClientImpl(inject(Dep)),
    providedIn: 'root',
  };
}

@Injectable()
class ServiceClientImpl implements AbstractService {
  ...
}

// other module

@Injectable()
class ServiceServerImpl implements AbstractService {
  ...
}

@NgModule({
  providers: [{provide: AbstractService, useClass: ServiceServerImpl}],
})
class ServiceServerModule {}