How to use the @igo2/utils.SubjectStatus.Waiting function in @igo2/utils

unwatchLayer(layer: Layer) {
    const index = this.layers.indexOf(layer);
    if (index >= 0) {
      const status = (layer as any).watcher.status;
      if ([SubjectStatus.Working, SubjectStatus.Waiting].includes(status)) {
        this.loaded += 1;
      }
      this.subscriptions[index].unsubscribe();
      this.subscriptions.splice(index, 1);
      this.layers.splice(index, 1);
    }
  }
}

unwatchLayer(layer: Layer) {
    layer.status$.next(SubjectStatus.Done);
    const index = this.layers.indexOf(layer);
    if (index >= 0) {
      const status = (layer as any).watcher.status;
      if (
        [SubjectStatus.Working, SubjectStatus.Waiting].indexOf(status) !== -1
      ) {
        this.loaded += 1;
      }
      this.subscriptions[index].unsubscribe();
      this.subscriptions.splice(index, 1);
      this.layers.splice(index, 1);
      (layer as any).watcher.unwatch();
    }
  }
}