ET9_WebGL_Dev/Packages/cn.etetet.yiuiloopscrollrectasync/Runtime/LoopScrollSizeHelper.cs

using UnityEngine;
using System.Collections;

namespace UnityEngine.UI
{
    // optional class for better scroll support
    public interface LoopScrollSizeHelper
    {
        Vector2 GetItemsSize(int itemsCount);
    }
}