From 9ed684785f868db5b154c4a09642b2b7d33dd6f3 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 15 Jul 2022 17:07:19 +0800
Subject: [PATCH] test: add test for type casting $refs to defineComponent
 instance type

---
 types/test/v3/define-component-test.tsx | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/types/test/v3/define-component-test.tsx b/types/test/v3/define-component-test.tsx
index fde804c400b..42d0f32eb0d 100644
--- a/types/test/v3/define-component-test.tsx
+++ b/types/test/v3/define-component-test.tsx
@@ -1139,6 +1139,14 @@ defineComponent({
   }
 })
 
+const X = defineComponent({
+  methods: {
+    foo() {
+      return 123
+    }
+  }
+})
+
 // Missing / mismatching Vue 2 properties
 // https://github.com/vuejs/vue/issues/12628#issuecomment-1177258223
 defineComponent({
@@ -1149,6 +1157,11 @@ defineComponent({
     this.$ssrContext
     this.$isServer
     this.$children[0].$root.$children
+
+    // type casting refs
+    const foo = this.$refs.foo as InstanceType<typeof X>
+    foo.foo().toExponential()
+
     return h('div', {}, [...this.$slots.default!])
   }
 })