From 3e7afc715463088576d6420f115c96dd959b6924 Mon Sep 17 00:00:00 2001
From: Orkhan Alikhanov <orkhan.alikhanov@gmail.com>
Date: Wed, 14 Aug 2019 18:20:50 +0400
Subject: [PATCH 1/3] Allow watch handler to be string as it is supported

---
 types/options.d.ts         | 2 +-
 types/test/options-test.ts | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/types/options.d.ts b/types/options.d.ts
index 3fe7a9b7aaf..f438463e81d 100644
--- a/types/options.d.ts
+++ b/types/options.d.ts
@@ -177,7 +177,7 @@ export interface WatchOptions {
 }
 
 export interface WatchOptionsWithHandler<T> extends WatchOptions {
-  handler: WatchHandler<T>;
+  handler: WatchHandler<T> | string;
 }
 
 export interface DirectiveBinding extends Readonly<VNodeDirective> {
diff --git a/types/test/options-test.ts b/types/test/options-test.ts
index 28060b7c817..d4ef99ae3d0 100644
--- a/types/test/options-test.ts
+++ b/types/test/options-test.ts
@@ -169,6 +169,10 @@ Vue.component('component', {
         this.a = val
       },
       deep: true
+    },
+    d: {
+      handler: 'someMethod',
+      immediate: true
     }
   },
   el: "#app",

From 300b6b5aeae380023978624ca327eb0a1f7c1b9e Mon Sep 17 00:00:00 2001
From: Orkhan Alikhanov <Orkhan.Alikhanov@gmail.com>
Date: Wed, 14 Aug 2019 19:09:17 +0400
Subject: [PATCH 2/3] Move string type to WatchHandler itself

---
 types/options.d.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/types/options.d.ts b/types/options.d.ts
index f438463e81d..d48b1669341 100644
--- a/types/options.d.ts
+++ b/types/options.d.ts
@@ -169,7 +169,7 @@ export interface ComputedOptions<T> {
   cache?: boolean;
 }
 
-export type WatchHandler<T> = (val: T, oldVal: T) => void;
+export type WatchHandler<T> = string | ((val: T, oldVal: T) => void);
 
 export interface WatchOptions {
   deep?: boolean;
@@ -177,7 +177,7 @@ export interface WatchOptions {
 }
 
 export interface WatchOptionsWithHandler<T> extends WatchOptions {
-  handler: WatchHandler<T> | string;
+  handler: WatchHandler<T>;
 }
 
 export interface DirectiveBinding extends Readonly<VNodeDirective> {

From 4003bbeb1e42fe51a5aa365e8244fe83c8d76e2a Mon Sep 17 00:00:00 2001
From: Orkhan Alikhanov <Orkhan.Alikhanov@gmail.com>
Date: Wed, 14 Aug 2019 20:13:32 +0400
Subject: [PATCH 3/3] Removed string type as it moved to WatchHandler

---
 types/options.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/types/options.d.ts b/types/options.d.ts
index d48b1669341..aafe3c54b9e 100644
--- a/types/options.d.ts
+++ b/types/options.d.ts
@@ -76,7 +76,7 @@ export interface ComponentOptions<
   propsData?: object;
   computed?: Accessors<Computed>;
   methods?: Methods;
-  watch?: Record<string, WatchOptionsWithHandler<any> | WatchHandler<any> | string>;
+  watch?: Record<string, WatchOptionsWithHandler<any> | WatchHandler<any>>;
 
   el?: Element | string;
   template?: string;