From 023f4ef7f41a8e52fa59c813f1a47582aa8aba84 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 18 Oct 2018 18:21:14 -0400
Subject: [PATCH] fix: watcher oldValue

---
 packages/core/src/componentWatch.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/src/componentWatch.ts b/packages/core/src/componentWatch.ts
index 33ceb025..183c230b 100644
--- a/packages/core/src/componentWatch.ts
+++ b/packages/core/src/componentWatch.ts
@@ -61,12 +61,12 @@ export function setupWatcher(
   const applyCb = () => {
     const newValue = runner()
     if (options.deep || newValue !== oldValue) {
-      oldValue = newValue
       try {
         cb.call(instance.$proxy, newValue, oldValue)
       } catch (e) {
         handleError(e, instance, ErrorTypes.WATCH_CALLBACK)
       }
+      oldValue = newValue
     }
   }