Prevent errors with layerable textnodes. Fixes #5720

src/navigator/index.ts

@@ -367,7 +367,7 @@ export default class LayerManager extends Module<LayerManagerConfig> {
   __isLayerable(cmp: Component): boolean {
     const tag = cmp.get('tagName');
     const hideText = this.config.hideTextnode;
-    const isValid = !hideText || (!cmp.is('textnode') && tag !== 'br');
+    const isValid = !hideText || (!cmp.isInstanceOf('textnode') && tag !== 'br');
 
     return isValid && cmp.get('layerable')!;
   }

src/navigator/view/ItemView.ts

@@ -4,7 +4,6 @@ import Component from '../../dom_components/model/Component';
 import ComponentView from '../../dom_components/view/ComponentView';
 import EditorModel from '../../editor/model/Editor';
 import { isEnterKey, isEscKey } from '../../utils/dom';
-import { getModel } from '../../utils/mixins';
 import LayerManager from '../index';
 import ItemsView from './ItemsView';
 import { getOnComponentDrag, getOnComponentDragEnd, getOnComponentDragStart } from '../../commands';
@@ -96,8 +95,8 @@ export default class ItemView extends View {
     return this.config.stylePrefix;
   }
 
-  opt: any;
+  opt: ItemViewProps;
-  module: any;
+  module: LayerManager;
   config: any;
   sorter: any;
   /** @ts-ignore */
@@ -357,7 +356,7 @@ export default class ItemView extends View {
     const countEl = itemEl.find('[data-count]');
 
     title[count ? 'removeClass' : 'addClass'](clsNoChild);
-    countEl.html(count || '');
+    countEl.html(`${count || ''}`);
     !count && module.setOpen(model, false);
   }
 

src/utils/dom.ts

@@ -37,7 +37,7 @@ export const attrUp = (el?: HTMLElement, attrs: ObjectAny = {}) =>
   el && el.setAttribute && each(attrs, (value, key) => el.setAttribute(key, value));
 
 export const isVisible = (el?: HTMLElement) => {
-  return el && !!(el.offsetWidth || el.offsetHeight || el.getClientRects().length);
+  return el && !!(el.offsetWidth || el.offsetHeight || el.getClientRects?.().length);
 };
 
 export const empty = (node: HTMLElement) => {