From 0418a47148f4f2562099cc6eb55ca7040ecaad27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A5=BD=E5=A4=9A=E5=A4=A7=E7=B1=B3?= <lost1q84@gmail.com>
Date: Thu, 8 Apr 2021 17:13:39 +0800
Subject: [PATCH] fix: update isFunction (#20912)

---
 src/utils/types.js | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/utils/types.js b/src/utils/types.js
index bfcceed5f..7f6bdeb56 100644
--- a/src/utils/types.js
+++ b/src/utils/types.js
@@ -1,3 +1,5 @@
+import Vue from 'vue';
+
 export function isString(obj) {
   return Object.prototype.toString.call(obj) === '[object String]';
 }
@@ -10,11 +12,25 @@ export function isHtmlElement(node) {
   return node && node.nodeType === Node.ELEMENT_NODE;
 }
 
-export const isFunction = (functionToCheck) => {
+/**
+ *  - Inspired:
+ *    https://github.com/jashkenas/underscore/blob/master/modules/isFunction.js
+ */
+let isFunction = (functionToCheck) => {
   var getType = {};
   return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
 };
 
+if (typeof /./ !== 'function' && typeof Int8Array !== 'object' && (Vue.prototype.$isServer || typeof document.childNodes !== 'function')) {
+  isFunction = function(obj) {
+    return typeof obj === 'function' || false;
+  };
+}
+
+export {
+  isFunction
+};
+
 export const isUndefined = (val)=> {
   return val === void 0;
 };