From ebe27295dfee4fee0610563efe3c7fefca0a5d67 Mon Sep 17 00:00:00 2001
From: Alexander Sheboltaev <a.sheboltaev@gmail.com>
Date: Sat, 11 Feb 2017 18:25:17 +0700
Subject: [PATCH] typings: type-checking WatchHandler -- refining

---
 types/test/vue-test.ts | 4 +++-
 types/vue.d.ts         | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/types/test/vue-test.ts b/types/test/vue-test.ts
index 3955a0c15..e2f6f38c3 100644
--- a/types/test/vue-test.ts
+++ b/types/test/vue-test.ts
@@ -1,6 +1,8 @@
 import Vue = require("../index");
 
 class Test extends Vue {
+  a: number;
+
   testProperties() {
     this.$data;
     this.$el;
@@ -37,7 +39,7 @@ class Test extends Vue {
       immediate: true,
       deep: false
     })();
-    this.$watch(() => {}, (val: number) => {});
+    this.$watch(() => this.a, (val: number) => {});
     this.$on("", () => {});
     this.$once("", () => {});
     this.$off("", () => {});
diff --git a/types/vue.d.ts b/types/vue.d.ts
index 0b96830d0..b8e32dd35 100644
--- a/types/vue.d.ts
+++ b/types/vue.d.ts
@@ -55,7 +55,7 @@ export declare class Vue {
     options?: WatchOptions
   ): (() => void);
   $watch<T>(
-    expOrFn: () => T,
+    expOrFn: (this: this) => T,
     callback: WatchHandler<this, T>,
     options?: WatchOptions
   ): (() => void);