I was finally able to get primeNG working with angular-cli. In `.angular-cli.json I have:

  "styles": [
          "../node_modules/primeng/resources/themes/omega/theme.css",
          "../node_modules/primeng/resources/primeng.css",
        "styles.css"
      ],

I am trying to use the CalendarModule like so:

import {CalendarModule} from "primeng/primeng";

@NgModule({
    imports: [
        CalendarModule
    ],

In the HTML I have the following:

<p-calendar styleClass="test" [(ngModel)]="validationDate" 
inputStyleClass="test" [showIcon]="true" dateFormat="dd.mm.yy"></pcalendar>

In the component css

@Component({
    selector: 'user-validation',
    templateUrl: 'user-validation.component.html',
    styleUrls: ['user-validation.component.css']
})

user-validation.component.css

.test{
    width: 25px;
}