How to use the @igo2/common.EntityStoreWatcher function in @igo2/common

ngOnInit() {
    const currentItems = this.map.layers.map((layer: Layer) => {
      return {
        id: layer.options.source.id,
        title: layer.title,
        type: CatalogItemType.Layer
      };
    });
    this.store.state.updateMany(currentItems, { added: true }, true);
    if (this.catalog && this.catalog.sortDirection !== undefined) {
      this.store.view.sort({
        direction: this.catalog.sortDirection,
        valueAccessor: (item: CatalogItem) => item.title
      });
    }
    this.watcher = new EntityStoreWatcher(this.store, this.cdRef);

  }

ngOnInit() {
    this.watcher = new EntityStoreWatcher(this.store, this.cdRef);
  }