How to use the angular-cesium.CesiumEvent.MOUSE_MOVE function in angular-cesium

ngOnInit() {
    const mouseOverObservable = this.mapEventsManager.register({
      entityType: Track,
      event: CesiumEvent.MOUSE_MOVE,
      pick: PickOptions.PICK_FIRST,
      priority: 2,
    });

    // Change color on hover
    mouseOverObservable.subscribe((event) => {
      const track = event.entities !== null ? event.entities[0] : null;
      if (this.lastPickTrack && (!track || track.id !== this.lastPickTrack.id)) {
        this.lastPickTrack.picked = false;
        this.layer.update(this.lastPickTrack, this.lastPickTrack.id);
      }
      if (track && (!this.lastPickTrack || track.id !== this.lastPickTrack.id)) {
        track.picked = true;
        this.layer.update(track, track.id);
      }
      this.lastPickTrack = track;

ngOnInit() {
    this.tracks$ = this.dataProvider.getDataSteam$().pipe(map(entity => ({
      id: entity.id,
      actionType: ActionType.ADD_UPDATE,
      entity: entity,
    })));

    const mouseOverObservable = this.mapEventsManager.register({
      event: CesiumEvent.MOUSE_MOVE,
      pick: PickOptions.PICK_FIRST,
      priority: 2,
    });

    // Change color on hover
    mouseOverObservable.subscribe((event) => {
      const track = event.entities !== null ? event.entities[0] : null;
      if (this.lastPickTrack && (!track || track.id !== this.lastPickTrack.id)) {
        this.lastPickTrack.picked = false;
        this.layer.update(this.lastPickTrack, this.lastPickTrack.id);
      }
      if (track && (!this.lastPickTrack || track.id !== this.lastPickTrack.id)) {
        track.picked = true;
        this.layer.update(track, track.id);
      }
      this.lastPickTrack = track;