From: Evan You <yyx990803@gmail.com>
Date: Wed, 28 Sep 2022 02:24:57 +0000 (+0800)
Subject: fix(ssr): fix dynamic slot regression in ssr
X-Git-Tag: v3.2.40~7
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8963c5508cde3a0c990b2748787ffb582b16f23f;p=thirdparty%2Fvuejs%2Fcore.git

fix(ssr): fix dynamic slot regression in ssr

fix #6651
---

diff --git a/packages/runtime-core/src/helpers/createSlots.ts b/packages/runtime-core/src/helpers/createSlots.ts
index 89ea7ac77c..b44d1f1090 100644
--- a/packages/runtime-core/src/helpers/createSlots.ts
+++ b/packages/runtime-core/src/helpers/createSlots.ts
@@ -33,7 +33,8 @@ export function createSlots(
             const res = slot.fn(...args)
             // attach branch key so each conditional branch is considered a
             // different fragment
-            ;(res as any).key = slot.key
+            // #6651 res can be undefined in SSR in string push mode
+            if (res) (res as any).key = slot.key
             return res
           }
         : slot.fn