How is this supposed to be used with Angular?

[duzenko]

import halcyon from 'halcyon-core-jsLegacy';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

    constructor() {
        console.log( halcyon.tigase.halcyon.core.Halcyon())
    }
}

Fail ERROR TypeError: this.eventBus is undefined