From 9722d1be3fed0a697a296c48cdb76c758dcc3fe2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <carter.li@eoitek.com>
Date: Tue, 1 Sep 2020 15:24:18 +0800
Subject: [PATCH] fix(runtime-core): fix `this` type of
 ComponentPublicInstance#$watch

Type `this` of ComponentPublicInstance#watch should be `ComponentPublicInstance`,
instead of `ComponentInternalInstance` which declared by `instanceWatch`
---
 packages/runtime-core/src/componentPublicInstance.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/componentPublicInstance.ts b/packages/runtime-core/src/componentPublicInstance.ts
index 35125ac819a..c47941fc568 100644
--- a/packages/runtime-core/src/componentPublicInstance.ts
+++ b/packages/runtime-core/src/componentPublicInstance.ts
@@ -1,6 +1,6 @@
 import { ComponentInternalInstance, Data } from './component'
 import { nextTick, queueJob } from './scheduler'
-import { instanceWatch } from './apiWatch'
+import { instanceWatch, WatchOptions, WatchStopHandle } from './apiWatch'
 import {
   EMPTY_OBJ,
   hasOwn,
@@ -162,7 +162,11 @@ export type ComponentPublicInstance<
   $options: Options
   $forceUpdate: ReactiveEffect
   $nextTick: typeof nextTick
-  $watch: typeof instanceWatch
+  $watch(
+    source: string | Function,
+    cb: Function,
+    options?: WatchOptions
+  ): WatchStopHandle
 } & P &
   ShallowUnwrapRef<B> &
   D &