import { OnlineStatusModule } from 'ngx-online-status';

@NgModule({
  declarations: [
    // ...
  ],
  imports: [
    OnlineStatusModule
  ],
  providers: [
    //...
  ]
})

import { OnlineStatusService, OnlineStatusType } from "ngx-online-status";

export class AppComponent {
  status: OnlineStatusType = this.onlineStatusService.getStatus(); // get initial status

  constructor(private onlineStatusService: OnlineStatusService) {
    this.onlineStatusService.status.subscribe((status: OnlineStatusType) => {
      // use status
      this.status = status;
    });
  }
}