diff --git a/packages/components/cascader-panel/src/utils.ts b/packages/components/cascader-panel/src/utils.ts
index db11cf5a1c..83f59ecdc3 100644
--- a/packages/components/cascader-panel/src/utils.ts
+++ b/packages/components/cascader-panel/src/utils.ts
@@ -1,4 +1,3 @@
-// @ts-nocheck
 import { isLeaf } from '@element-plus/utils'
 import type { default as CascaderNode } from './node'
 
@@ -8,7 +7,7 @@ export const getMenuIndex = (el: HTMLElement) => {
   return Number(pieces[pieces.length - 2])
 }
 
-export const checkNode = (el) => {
+export const checkNode = (el: HTMLElement) => {
   if (!el) return
 
   const input = el.querySelector('input')