From fe7da419562108b1da4226cf9107f63d697996b1 Mon Sep 17 00:00:00 2001
From: moonformeli <mgyang95@gmail.com>
Date: Tue, 12 Feb 2019 15:50:11 +0900
Subject: [PATCH] Cancel old timer, editing pr #4139 (#4187)

* Cancel old timer, editing pr for $4139
---
 debounce.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/debounce.js b/debounce.js
index 581a4c259..e48e8ffaa 100644
--- a/debounce.js
+++ b/debounce.js
@@ -78,7 +78,7 @@ function debounce(func, wait, options) {
   // Bypass `requestAnimationFrame` by explicitly setting `wait=0`.
   const useRAF = (!wait && wait !== 0 && typeof root.requestAnimationFrame === 'function')
 
-  if (typeof func != 'function') {
+  if (typeof func !== 'function') {
     throw new TypeError('Expected a function')
   }
   wait = +wait || 0
@@ -101,6 +101,7 @@ function debounce(func, wait, options) {
 
   function startTimer(pendingFunc, wait) {
     if (useRAF) {
+      root.cancelAnimationFrame(timerId);
       return root.requestAnimationFrame(pendingFunc)
     }
     return setTimeout(pendingFunc, wait)