portalHostDirective.ts

@Component({
    selector: 'app-test',
    template: `
        <ng-content [cdkPortalHost]="_portalInstance"></ng-content>
    `
})
export class TestComponent implements OnInit {
    _portalInstance: Portal<any>;
    
    constructor() { }
    
    ngOnInit() {
      this._portalInstance = new ComponentPortal(HeaderComponent);
    }
}