user.query.ts

@Injectable({ providedIn: 'root' })
export class UserQuery extends Query<UserState> {

  constructor(protected store: UserStore) {
    super(store);
  }

  hasFlags(flags: string | string[]): boolean {
    const userFlags = this.getValue().featureFlags;
    return coerceArray(flags).every(current => userFlags[current]);
  }
}

user.store.ts

@Injectable({ providedIn: 'root' })
@StoreConfig({ name: 'user' })
export class UserStore extends Store<UserState> {

  constructor() {
    super(createInitialState());
  }

}