From 21b685ad9d9d0e6060fc7d07b719bf35f2d9ae1f Mon Sep 17 00:00:00 2001
From: =?utf8?q?=E5=B1=B1=E5=90=B9=E8=89=B2=E5=BE=A1=E5=AE=88?=
 <85992002+KazariEX@users.noreply.github.com>
Date: Fri, 18 Jul 2025 01:22:56 -0700
Subject: [PATCH] fix(compiler-core): avoid self updates of `v-pre` (#12556)

---
 packages/compiler-core/src/parser.ts | 5 +++--
 packages/compiler-core/src/utils.ts  | 4 ++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/packages/compiler-core/src/parser.ts b/packages/compiler-core/src/parser.ts
index 3eb3a976f4..a6e25681d7 100644
--- a/packages/compiler-core/src/parser.ts
+++ b/packages/compiler-core/src/parser.ts
@@ -43,6 +43,7 @@ import {
   isCoreComponent,
   isSimpleIdentifier,
   isStaticArgOf,
+  isVPre,
 } from './utils'
 import { decodeHTML } from 'entities/lib/decode.js'
 import {
@@ -246,7 +247,7 @@ const tokenizer = new Tokenizer(stack, {
   ondirarg(start, end) {
     if (start === end) return
     const arg = getSlice(start, end)
-    if (inVPre) {
+    if (inVPre && !isVPre(currentProp!)) {
       ;(currentProp as AttributeNode).name += arg
       setLocEnd((currentProp as AttributeNode).nameLoc, end)
     } else {
@@ -262,7 +263,7 @@ const tokenizer = new Tokenizer(stack, {
 
   ondirmodifier(start, end) {
     const mod = getSlice(start, end)
-    if (inVPre) {
+    if (inVPre && !isVPre(currentProp!)) {
       ;(currentProp as AttributeNode).name += '.' + mod
       setLocEnd((currentProp as AttributeNode).nameLoc, end)
     } else if ((currentProp as DirectiveNode).name === 'slot') {
diff --git a/packages/compiler-core/src/utils.ts b/packages/compiler-core/src/utils.ts
index 113096cef2..ab851ed6f6 100644
--- a/packages/compiler-core/src/utils.ts
+++ b/packages/compiler-core/src/utils.ts
@@ -343,6 +343,10 @@ export function isText(
   return node.type === NodeTypes.INTERPOLATION || node.type === NodeTypes.TEXT
 }
 
+export function isVPre(p: ElementNode['props'][0]): p is DirectiveNode {
+  return p.type === NodeTypes.DIRECTIVE && p.name === 'pre'
+}
+
 export function isVSlot(p: ElementNode['props'][0]): p is DirectiveNode {
   return p.type === NodeTypes.DIRECTIVE && p.name === 'slot'
 }
-- 
2.47.2