How to use the @egjs/infinitegrid.categorize function in @egjs/infinitegrid

const nativeIG = this.$_nativeInfiniteGrid;
		const items = this.$_toItems();

		let visibleChildren: VNode[] = [];
		if (nativeIG) {
			const result = nativeIG.beforeSync(items.filter(val => !val.isLoading));
			this.$_layout = result === "relayout"
				? result
				: (this.$_layout || result);

			visibleChildren = nativeIG.getRenderingItems().map(item => item.vnode);
			if (this.$slots.loading && nativeIG.isLoading()) {
				visibleChildren.push(...this.$slots.loading);
			}
		} else {
			const groups = categorize(items);
			if (this.status) {
				const { startCursor, endCursor } = this.status._infinite;

				visibleChildren = ItemManager.pluck(
					groups.slice(startCursor, endCursor + 1),
					"items",
				).map((item: IItem) => item.vnode);
			} else if (this.useFirstRender && groups[0]) {
				visibleChildren = groups[0].items.map((item: IItem) => item.vnode);
			}
		}

		// To bypass
		// [Vue warn]: Avoid using observed data object as vnode data: {}
		const wrapperData = {};
		for (const key in this.wrapperData) {