What is the alternative to the deprecated 'combineLatest' method in rxJs and how can it be replaced?

Recently, I came across a situation where I had implemented a method using the combinlatest rsjx/operator. It was working perfectly fine. However, Sonar flagged it as deprecated and now I need to update it to the latest version. When I tried to simply replace the import, I encountered an error. I'm looking for some expert guidance on how to properly convert it to the latest version.

gX$ = createEffect(() => this.actions$.pipe(
    ofType(ActionType.A),
    combineLatest(this.service.getoc()),
    mergeMap(([, oc]) => this.reviewService.findBy(oc.id,
      new Date(),
      new Date(new Date().setDate(new Date().getDate() + 1)))
      .pipe(
        mergeMap(d => {
          return of(reviewLoadSuccess({ reviews: getReviews(d) }));
        }
        ),
        catchError(error => {
          return of(reviewLoadFailure({ error: error }));
        })
      )
    )));
typescriptrxjsrxjs6ngrx-effectscombinelatest

Answer №1

To correctly implement this functionality, make sure to import from rxjs instead of rxjs/oeprators. Here's how you can use it:

import { combineLatest } from 'rxjs';

combineLatest([
  this.actions$.pipe(ofType(ActionType.A)),
  this.service.getoc()
]).pipe(mergeMap(...));

Answer №2

If you only need the value returned by this.service.getoc(), consider using the switchMapTo operator instead, as shown in the example below:

 gX$ = createEffect(() => this.actions$.pipe(
   ofType(ActionType.A),
   switchMapTo(this.service.getoc()),
   mergeMap(oc => this.reviewService.findBy(oc.id,
     new Date(),
     new Date(new Date().setDate(new Date().getDate() + 1)))
     .pipe(
       mergeMap(d => {
         return of(reviewLoadSuccess({ reviews: getReviews(d) }));
       }
       ),
       catchError(error => {
         return of(reviewLoadFailure({ error: error }));
       })
     )
   )));

In case you also want to use the action, you can make the following changes:

gX$ = createEffect(() => this.actions$
  .pipe(
    ofType(ActionType.A),
    switchMap(action => this.service.getoc().pipe(
      switchMap(oc => {
        //  You now have access to both the action and oc
        // ... continue with your code here
      })
    ))
  )
)

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