From 5002ab53d6bf379da6ae4aadc89bbbed31318c6c Mon Sep 17 00:00:00 2001
From: Aurelius333 <22969541+Aurelius333@users.noreply.github.com>
Date: Fri, 14 Aug 2020 17:36:26 -0400
Subject: [PATCH] types(runtime-core): make `this` void in emits validator
 (#1842)

---
 packages/runtime-core/src/componentOptions.ts |  2 +-
 test-dts/defineComponent.test-d.tsx           | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/packages/runtime-core/src/componentOptions.ts b/packages/runtime-core/src/componentOptions.ts
index 72fffe241e..816a49c608 100644
--- a/packages/runtime-core/src/componentOptions.ts
+++ b/packages/runtime-core/src/componentOptions.ts
@@ -106,7 +106,7 @@ export interface ComponentOptionsBase<
   components?: Record<string, PublicAPIComponent>
   directives?: Record<string, Directive>
   inheritAttrs?: boolean
-  emits?: E | EE[]
+  emits?: (E | EE[]) & ThisType<void>
 
   // Internal ------------------------------------------------------------------
 
diff --git a/test-dts/defineComponent.test-d.tsx b/test-dts/defineComponent.test-d.tsx
index f7dacfcbe2..94669213ed 100644
--- a/test-dts/defineComponent.test-d.tsx
+++ b/test-dts/defineComponent.test-d.tsx
@@ -710,6 +710,17 @@ describe('emits', () => {
   const instance = {} as ComponentPublicInstance
   instance.$emit('test', 1)
   instance.$emit('test')
+
+  // `this` should be void inside of emits validators
+  defineComponent({
+    props: ['bar'],
+    emits: {
+      foo(): boolean {
+        // @ts-expect-error
+        return this.bar === 3
+      }
+    }
+  })
 })
 
 describe('componentOptions setup should be `SetupContext`', () => {
-- 
2.47.2