diff --git a/typescript/base/tree/ztree/asynctree.ts b/typescript/base/tree/ztree/asynctree.ts
index b0671368e..7a279bb6a 100644
--- a/typescript/base/tree/ztree/asynctree.ts
+++ b/typescript/base/tree/ztree/asynctree.ts
@@ -3,6 +3,8 @@ import { TreeView, TreeValue } from "./treeview";
 export declare class AsyncTree extends TreeView {
     static xtype: string;
 
+    nodes: any;
+
     _beforeExpandNode<T>(treeId: string, treeNode: T): void;
 
     _join(valueA: TreeValue, valueB: TreeValue): TreeValue;
diff --git a/typescript/base/tree/ztree/treeview.ts b/typescript/base/tree/ztree/treeview.ts
index 0bdf2ac30..5ca399581 100644
--- a/typescript/base/tree/ztree/treeview.ts
+++ b/typescript/base/tree/ztree/treeview.ts
@@ -62,7 +62,7 @@ export declare class TreeView extends Pane {
     getValue(): TreeValue;
 
     // @ts-ignore
-    populate(config: {[key: string]: any}): void;
+    populate(config?: {[key: string]: any}): void;
 }
 
 export interface TreeValue {