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

{
				isOverflowScroll,
				horizontal,
				container: this._renderer.container,
				resize: () => setTimeout(() => { this.setState({ layout: true }); }),
				check: param => this._onCheck(param),
			});
		this._infinite = new Infinite(this._items, {
			horizontal,
			threshold,
			useRecycle: true,
			append: param => this._requestAppend(param),
			prepend: param => this._requestPrepend(param),
			recycle: param => this._recycle(param),
		});
		this._manager = new LayoutManager(this._items, this._renderer, {
			isEqualSize,
			isConstantSize,
		});

		this._manager.setLayout(this._layout);
		this._updateLayout();
		this._setSize(this._renderer.getViewportSize());
		this._updateGroups();
		this._watcher.setScrollPos();

		const items = this._getVisibleItems();
		const status = this.props.status;
		const length = items.length;

		if (!length) {
			this.state.isFirstRender = false;