From 1675b6d723829d1f61e697735e3da7b16aa1362d Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 25 Jun 2021 16:18:21 -0400
Subject: [PATCH] fix: defineExpose type definition and runtime warning

---
 packages/runtime-core/src/apiSetupHelpers.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/runtime-core/src/apiSetupHelpers.ts b/packages/runtime-core/src/apiSetupHelpers.ts
index 4679df90193..c1703f22333 100644
--- a/packages/runtime-core/src/apiSetupHelpers.ts
+++ b/packages/runtime-core/src/apiSetupHelpers.ts
@@ -61,6 +61,16 @@ export function defineEmits() {
  */
 export const defineEmit = defineEmits
 
+export function defineExpose(exposed?: Record<string, any>) {
+  if (__DEV__) {
+    warn(
+      `defineExpose() is a compiler-hint helper that is only usable inside ` +
+        `<script setup> of a single file component. Its usage should be ` +
+        `compiled away and calling it at runtime has no effect.`
+    )
+  }
+}
+
 /**
  * @deprecated use `useSlots` and `useAttrs` instead.
  */