From ac80ea2c1920982b336e76e837e2a4fc8b1d0075 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Sat, 21 Nov 2020 16:06:50 -0500
Subject: [PATCH] chore: warning for outdated hmr api usage

---
 packages/runtime-core/src/hmr.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/runtime-core/src/hmr.ts b/packages/runtime-core/src/hmr.ts
index 9a2d20def..7f28b2c7a 100644
--- a/packages/runtime-core/src/hmr.ts
+++ b/packages/runtime-core/src/hmr.ts
@@ -9,6 +9,7 @@ import {
 } from './component'
 import { queueJob, queuePostFlushCb } from './scheduler'
 import { extend } from '@vue/shared'
+import { warn } from './warning'
 
 export let isHmrUpdating = false
 
@@ -67,6 +68,14 @@ function createRecord(
   id: string,
   component: ComponentOptions | ClassComponent
 ): boolean {
+  if (!component) {
+    warn(
+      `HMR API usage is out of date.\n` +
+        `Please upgrade vue-loader/vite/rollup-plugin-vue or other relevant ` +
+        `depdendency that handles Vue SFC compilation.`
+    )
+    component = {}
+  }
   if (map.has(id)) {
     return false
   }