Angular @Injectable() - there is no 'providers' key, so how to implement the Dependency...

Usually I used the providers array key in a@Component or @ngModule in order to provide a dependency object to implement the DI principle. For example:

providers: [
{provide: BaseDataService, useClass: UsersDataService} // where BaseDataService is an abstraction with methods to be implemented
]


While Angular developers recommend using @Injectable ({provideIn: 'root' }) due to 'tree-shaking' possibility. But as I told earlier there's no providers array key among the parameters, useFactory only. So the question is - how do I? Or should I use the "classic" way with the providers array within a @Component()?

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