Could not use Observable.of in RxJs 6 and Angular 6

Question

 import { Observable, of } from \"rxjs\";

// And if I try to return like this
  return Observable.of(this.purposes);

I am getting an error stating

Answer 1

rxjs 6

import { PreloadingStrategy, Route } from '@angular/router';
import { Observable, of } from 'rxjs';

export class SelectivePreloadingStrategy implements PreloadingStrategy {
    preload(route: Route, load: Function): Observable {
       return route.data && route.data.preload === false ? of(null) : load();
    }

 }