Angular - Type 'IUser | null' is not assignable to type 'IUser'-CodePudding

In my Angular-13, I have this code:

export class AuthService {
  baseUrl = environment.apiUrl;
  private currentUserSource = new ReplaySubject<IUser | null>(1);
  currentUser$ = this.currentUserSource.asObservable();

...
}

export class JwtInterceptor implements HttpInterceptor {
  constructor(private authService: AuthService) {}

  intercept(request: HttpRequest<unknown>, next: HttpHandler): Observable<HttpEvent<unknown>> 
 {
    let currentUser: IUser;
    this.authService.currentUser$.pipe(take(1)).subscribe(user => currentUser = user);
    if(currentUser!){
      request = request.clone({
        setHeaders:{
          Authorization: `Bearer ${currentUser.token}`
        }
      });
    }
    return next.handle(request);
  }
}

I got this error:

Type 'IUser | null' is not assignable to type 'IUser'

currentUser is highlighted in user => currentUser = user)

How do I resolve this?

Thanks

CodePudding user response：

The issue is that the type of your variable currentUser is IUser and it is been assined the value from currentUser$, which I believe has the type Observable<IUser | null>

To fix it replace line

let currentUser: IUser;

with

let currentUser: IUser | null;

or make sure the type of currentUser$ is Observable<IUser>