@ngrx/data - Adding a partial entity

[duxnp]

I've got a question about @ngrx/data which I'm not sure would be considered a bug or working as intended. The issue relates to adding a new entity to the backend.

You can create an entity collection service a couple different ways:

• Inject EntityServices and use it to grab one of the default entity collection services from its registry like so...

constructor(entityServices: EntityServices) {
  this.defautHeroesService = entityServices.getEntityCollectionService('Hero');
  this.heroes$ = this.defautHeroesService.entities$;
}

• Or, create a custom entity collection service by extending EntityCollectionServiceBase then inject that service like so...

constructor(public customHeroesService: HeroesService) {
  this.heroes$ = this.customHeroesService.entities$;
}

I've noticed the add method of default vs custom entity collection services behaves differently. The custom service will let you supply a partial type. However, with the add method of the default service TypeScript will complain if you try supplying a partial. I would of course like to avoid creating a custom service for every single entity type.

Here is a stackblitz project demonstrating this. Could someone let me know?
https://stackblitz.com/edit/angular-ivy-xbuvcn?file=src%2Fapp%2Fapp.component.ts