NgxStoreDecorators for Angular

NgxStoreDecorators is a set of useful decorators and classes for quickly create NgRx store facades, assigning values, observables or observables values to class properties.

This package introduce:

@StoreSelect(), @StoreSubscribe(), @StoreDispatch() decorators and StoreFacade abstract class for NgRx store maintaining,

@Select(), @Subscribe() decorators and WithSubscriptions abstract class to assign observables or observables values and handle subscriptions,

also @Get() to assign values from injected classes method or properties.

Example

Sample store facade service:

@Injectable()
export class CounterFacadeService extends StoreFacade {
  @StoreSelect(selectors.getCount) 
  public count$: Observable<number>;

  @StoreSelect(selectors.getCountMutliplyBy) 
  public countMultiplyBy$: (multiplyBy: number) => Observable<number>;

  @StoreSubscribe(selectors.getCount) 
  public count: number;

  public constructor(protected store: Store<State>) {
    super();
  }

  @StoreDispatch(actions.CounterSet)
  public counterSet(payload: number) {}
}

without Store decorators and StoreFacade abstract class:

@Injectable()
export class CounterFacadeService {

  public count$: Observable<number>;
  
  public countMultiplyBy$: (multiplyBy: number) => Observable<number>;
  
  public count: number;

  public readonly subscriptions = new Subscription();
  
  public constructor(protected store: Store<State>) {
    this.count$ = this.store.pipe(select(selectors.getCount));
    
    this.countMultiplyBy$ = (multiplyBy: number) => this.store.pipe(select(selectors.getCountMutliplyBy(multiplyBy)));
    
    this.subscriptions.add(
      this.store.pipe(select(selectors.getCount))
      .subscribe(value => this.count = value));
  }

  public counterSet(payload: number): void {
    this.store.dispatch(new actions.CounterSet(payload))
  }
  
  public unsubscribeAll(): void {
    this.subscriptions.unsubscribe();
  }
}

Sample usage in component or service:

@Component({
  selector: 'app-basic-usage',
  templateUrl: './basic-usage.component.html',
  styleUrls: ['./basic-usage.component.scss']
})
export class BasicUsageComponent extends WithSubscriptions implements OnDestroy {
  @Select(CounterFacadeService, 'count$')
  public count$: Observable<number>;

  @Subscribe(CounterFacadeService, 'count$')
  public count: number;
  
  @Get(CounterFacadeService, 'count')
  public getCount: number;
  
  @Get(CounterFacadeService, 'countFunction')
  public getCountFunction: number;

  public constructor(public counterFacadeService: CounterFacadeService) {
    super();
  }

  public ngOnDestroy(): void {
    this.unsubscribeAll();
  }
}

without decorators and WithSubscriptions abstract class:

@Component({
  selector: 'app-basic-usage',
  templateUrl: './basic-usage.component.html',
  styleUrls: ['./basic-usage.component.scss']
})
export class BasicUsageComponent implements OnInit, OnDestroy {
  public count$: Observable<number>;

  public count: number;
  
  public getCount: number;
  
  public getCountFunction: number;
  
  public readonly subscriptions = new Subscription();

  public constructor(public counterFacadeService: CounterFacadeService) {}

  public ngOnInit(): void {
    this.count$ = this.counterFacadeService.count$
    
    this.subscriptions.add(
      this.counterFacadeService.count$
      .subscribe(value => this.count = value)
    )
    
    this.getCount = this.counterFacadeService.count;
    
    this.getCountFunction = this.counterFacadeService.countFunction();
  }
  
  public ngOnDestroy(): void {
    this.unsubscribeAll();
  }
  
  public unsubscribeAll(): void {
    this.subscriptions.unsubscribe();
  }
}

Decorators configuration (optional)

log - [?boolean]

Default is set to false. Set to true if you want to console.log all new values from an observable. Optional for @StoreSelect(), @StoreSubscribe(), @Select(), @Subscribe()

pipe - [?OperatorFunction<any, any>[]]

Here you can pass some RxJs operators. Optional for @StoreSelect(), @StoreSubscribe(), @Select(), @Subscribe()

subscriptionsCollector - [?string]

Default is set to subscriptions witch should be an RxJs Subscription instance. You can extend component or service with StoreFacade or WithSubscriptions abstract classes to automatically add this property to class. Optional for @StoreSubscribe(), @Subscribe()

takeUntil - [?string]

You can handle subscriptions by takeUntil operator. Here you just pass a name of the class property witch should be Subject instance. Optional for @StoreSubscribe(), @Subscribe()

args - [?any[]]

You can resolve injection method with given arguments. Optional for @Select(), @Subscribe(), @get()

Demo

To see decorators and classes usage in real app check DEMO or download git repository then type

 npm install // OR
 yarn
 
 ng serve

Then navigate to http://localhost:4200/.