update

src/base/single/bar/bar.loading.js

@@ -2,7 +2,7 @@ import { shortcut, emptyFn } from "@/core";
 import { Single } from "../0.single";
 
 @shortcut()
-class LoadingBar extends Single {
+export class LoadingBar extends Single {
     static xtype = "bi.loading_bar";
 
     _defaultConfig() {

src/case/button/treeitem/treeitem.js

@@ -51,7 +51,7 @@ export class BasicTreeItem extends NodeButton {
             width: 24,
         } : null;
 
-        const indent = layer === 0 ? null : {
+        const indent = {
             el: {
                 type: Layout.xtype,
                 height,

src/widget/singletree/singletree.popup.js

@@ -31,7 +31,7 @@ export class SingleTreePopup extends Pane {
             o = this.options;
 
         this.tree = createWidget({
-            type: "bi.level_tree",
+            type: LevelTree.xtype,
             expander: {
                 isDefaultInit: true,
             },