Custom Sitecore JSS Descendants resolver

DescendantsRenderingContentsResolver.cs

    /// <summary>
    /// Builds a tree-like structure of datasource item's descendants
    /// </summary>
    /// <seealso cref="Sitecore.LayoutService.ItemRendering.ContentsResolvers.RenderingContentsResolver" />
    public class DescendantsRenderingContentsResolver : Sitecore.LayoutService.ItemRendering.ContentsResolvers.RenderingContentsResolver
    {
        protected override JObject ProcessItem(Item item, IRenderingConfiguration renderingConfig)
        {
            var jObject = base.ProcessItem(item, renderingConfig);

            if (item.Children.Count == 0)
            {
                return jObject;
            }

            jObject["items"] = ProcessItems(item.Children, renderingConfig);

            return jObject;
        }
    }