Hello,
I just used the TreeView widget and inserted items with the API method 'insertAfter' and 'insertBefore'. Unfortunately the typescript definition of these methods says, it returns void, but actually it returns the new inserted item (which I need at this point). I updated my kendo.all.d.ts file now, but if I will update kendo in the future, it would overwrite these lines. It would be great if you could fix this for the next release.
insertAfter(nodeData: any, referenceNode: JQuery): void;
insertBefore(nodeData: any, referenceNode: JQuery): void;
// to
insertAfter(nodeData: any, referenceNode: JQuery): JQuery;
insertBefore(nodeData: any, referenceNode: JQuery): JQuery;