You're missing injecting the Service in providers

With this you should be fine

@Component({ 
  selector: 'app',
  template: `<h1>Hello World</h1>
<li *ngFor="#customer of customers">
  <span>{{customer.firstName}}</span> 
</li>
`,
 providers : [DataService] // << You missed this
})
export class AppComponent {
    public dataService: DataService;
    public customers: any[];


    constructor(dataService: DataService) {  // << And this 
        this.dataService = dataService;
    }

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