Version 5 of angularfie2 is encountering an issue where the type 'Observable<{}[]>' cannot be assigned to the type 'Observable<any[]>'

Encountering an error while using angularfire2 version 5:

The error reads: "Type 'Observable<{}[]>' is not assignable to type Observable < any [] >."

Code snippet:

  exercisesList$: Observable <any[]>;

  ionViewDidLoad() {
    this.exercisesList$ = this.workoutProvider.getExercises();
  }

getExercises()

 getExercises(){
    return this.db.list(`Exercises/${localStorage.getItem('workoutName')}`).valueChanges();
  }

HTML

  <ion-list>
    <ion-item *ngFor="let exercise of exercisesList$ | async">{{exercise.name}}</ion-item>
  </ion-list>

Screenshot

https://i.stack.imgur.com/6ZL0p.png

Seeking clarification on the type of valueChanges and solution for the issue.

Thank you.

Answer №1

There is an unresolved issue related to this matter:

https://github.com/angular/angularfire2/issues/1299

You have a couple of options to address it:

  • To resolve the issue, you can update the exercisesList$ type to Observable <{}[]> as per the transpiler suggestion.

  • An alternative approach is to explicitly cast the return type:

this.exercisesList$ = this.workoutProvider.getExercises() as Observable<any[]>
this.exercisesList$ = (Observable<any[]>) this.workoutProvider.getExercises()

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