Type 'ConnectionState' is not assignable to type 'boolean'

import { Component } from '@angular/core';
import { ConnectionService, ConnectionState } from 'ng-connection-service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  title = 'finalProject';
  status = 'ONLINE'; //initializing as online by default
  isConnected: ConnectionState = false;

  constructor(private connectionService: ConnectionService) {
    this.connectionService.monitor().subscribe((isConnected) => {
      this.isConnected = isConnected;
      if (this.isConnected) {
        this.status = 'ONLINE';
      } else {
        this.status = 'OFFLINE';
      }
      alert(this.status);
    });
  }
}