From d65235df389697740b33c07b20cd764eb0f30323 Mon Sep 17 00:00:00 2001
From: sapphi-red <49056869+sapphi-red@users.noreply.github.com>
Date: Tue, 11 Nov 2025 18:55:42 +0900
Subject: [PATCH] fix: don't set `ssr.optimizeDeps.rollupOptions` compat if
 `ssr` option is not set

---
 packages/vite/src/node/config.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/packages/vite/src/node/config.ts b/packages/vite/src/node/config.ts
index 6abf1a975dd849..3e3ef91ec2b618 100644
--- a/packages/vite/src/node/config.ts
+++ b/packages/vite/src/node/config.ts
@@ -1301,9 +1301,10 @@ export async function resolveConfig(
   setupRollupOptionCompat(config.worker)
   config.optimizeDeps ??= {}
   setupRollupOptionCompat(config.optimizeDeps)
-  config.ssr ??= {}
-  config.ssr.optimizeDeps ??= {}
-  setupRollupOptionCompat(config.ssr.optimizeDeps)
+  if (config.ssr) {
+    config.ssr.optimizeDeps ??= {}
+    setupRollupOptionCompat(config.ssr.optimizeDeps)
+  }
 
   let configFileDependencies: string[] = []
   let mode = inlineConfig.mode || defaultMode