Angular - “tidak memiliki anggota yang diekspor 'Dapat diamati'”
Kode skrip: import { Injectable } from '@angular/core'; import { Observable } from 'rxjs/Observable'; import { of } from 'rxjs/observable/of'; import { Hero } from './hero'; import { HEROES } from './mock-heroes'; @Injectable({ providedIn: 'root' }) export class HeroService { constructor()...