From e59152c550e90e4f0e2600a09eaa81c976619864 Mon Sep 17 00:00:00 2001
From: Pooya Parsa <pooya@pi0.ir>
Date: Mon, 19 Mar 2018 02:44:27 +0330
Subject: [PATCH] fix(utils): use typeof for function check

---
 lib/common/utils.mjs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/common/utils.mjs b/lib/common/utils.mjs
index 96730ab8c3..2559e79b16 100644
--- a/lib/common/utils.mjs
+++ b/lib/common/utils.mjs
@@ -133,8 +133,8 @@ export const parallel = function parallel(tasks, fn) {
 
 export const chainFn = function chainFn(base, fn) {
   /* istanbul ignore if */
-  if (!(fn instanceof Function)) {
-    return
+  if (typeof fn !== 'function') {
+    return base
   }
   return function () {
     if (typeof base !== 'function') {