How to request a token for a class?

Question

Angular

Banal class:

@Injectable()
export class SearchFilter {
    constructor(
        @Inject(SEARCH_CONFIG) private searchConfig: SearchConfig) {}
}

How to provide a token SEARCH_CONFIGfor a class SearchFilter in a module?

Should I use useFactory or are there other approaches?

Answer 1

Not for the class. The token will be passed into the injector.
Injectors are created per platform, per root, per module, per directive (there is a node injector).
useFactory, useValue are already details, i.e. an indication to the injector where to get the value for this token.

Answer 2

Why is useClass not suitable?