How to use the @ngrx/data.EntityCacheAction.SAVE_ENTITIES_ERROR function in @ngrx/data

ea.payload.entityOp.endsWith(OP_ERROR)
        )
      )
      // this service never dies so no need to unsubscribe
      .subscribe(action =>
        toast.openSnackBar(
          `${action.payload.entityName} action`,
          action.payload.entityOp
        )
      );

    actions$
      .pipe(
        ofType(
          EntityCacheAction.SAVE_ENTITIES_SUCCESS,
          EntityCacheAction.SAVE_ENTITIES_ERROR
        )
      )
      .subscribe((action: any) =>
        toast.openSnackBar(
          `${action.type} - url: ${action.payload.url}`,
          'SaveEntities'
        )
      );
  }
}