From 4a42cae8db04ebd5b526fe45b03a51a24a0e5863 Mon Sep 17 00:00:00 2001
From: sapphi-red <49056869+sapphi-red@users.noreply.github.com>
Date: Tue, 20 Jan 2026 17:26:42 +0900
Subject: [PATCH] fix(optimizer): skip `rolldownCjsExternalPlugin` for
 `platform: neutral`

---
 packages/vite/src/node/optimizer/rolldownDepPlugin.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/vite/src/node/optimizer/rolldownDepPlugin.ts b/packages/vite/src/node/optimizer/rolldownDepPlugin.ts
index 9aad39c9939898..48b2f4f00f6d8a 100644
--- a/packages/vite/src/node/optimizer/rolldownDepPlugin.ts
+++ b/packages/vite/src/node/optimizer/rolldownDepPlugin.ts
@@ -315,10 +315,14 @@ export function rolldownCjsExternalPlugin(
   if (platform === 'node') {
     return undefined
   }
+  // Skip this plugin for `platform: 'neutral'` as we are not sure whether `require` is available
+  if (platform === 'neutral') {
+    return undefined
+  }
 
   // Apply this plugin for `platform: 'browser'` as `require` is not available in browser and
   // converting to `import` would be necessary to make the code work
-  platform satisfies 'browser' | 'neutral'
+  platform satisfies 'browser'
 
   const filter = new RegExp(externals.map(matchesEntireLine).join('|'))