From 41429420172206b3f7e6c790d118077297b2aa16 Mon Sep 17 00:00:00 2001
From: Artem Abramov <Artem_Abramov1@epam.com>
Date: Fri, 13 Jun 2025 09:44:25 +0400
Subject: [PATCH 1/2] feat: add css files to server bundle for optimizeCss
 feature to work

---
 packages/open-next/src/build/copyTracedFiles.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/open-next/src/build/copyTracedFiles.ts b/packages/open-next/src/build/copyTracedFiles.ts
index 0dd2f15a8..445b05eba 100644
--- a/packages/open-next/src/build/copyTracedFiles.ts
+++ b/packages/open-next/src/build/copyTracedFiles.ts
@@ -2,6 +2,7 @@ import url from "node:url";
 
 import {
   copyFileSync,
+  cpSync,
   existsSync,
   mkdirSync,
   readFileSync,
@@ -360,6 +361,14 @@ File ${serverPath} does not exist
       .forEach((file) => copyStaticFile(`server/${file}`));
   }
 
+  // Copy .next/static/css from standalone to output dir
+  // needed for optimizeCss feature to work
+  cpSync(
+    path.join(standaloneNextDir, "static", "css"),
+    path.join(outputNextDir, "static", "css"),
+    { recursive: true },
+  );
+
   logger.debug("copyTracedFiles:", Date.now() - tsStart, "ms");
 
   return {

From a48b3a7bcd68cbe522da4e2e73cf9ceee5097c5c Mon Sep 17 00:00:00 2001
From: Artem Abramov <Artem_Abramov1@epam.com>
Date: Mon, 16 Jun 2025 11:21:20 +0400
Subject: [PATCH 2/2] feat: add css files to server bundle for optimizeCss
 feature to work

- add css files conditionally depending on optimizeCss flag
---
 .../open-next/src/build/copyTracedFiles.ts     | 18 ++++++++++++------
 packages/open-next/src/types/next-types.ts     |  1 +
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/packages/open-next/src/build/copyTracedFiles.ts b/packages/open-next/src/build/copyTracedFiles.ts
index 445b05eba..d38338f7b 100644
--- a/packages/open-next/src/build/copyTracedFiles.ts
+++ b/packages/open-next/src/build/copyTracedFiles.ts
@@ -361,19 +361,25 @@ File ${serverPath} does not exist
       .forEach((file) => copyStaticFile(`server/${file}`));
   }
 
+  const manifests = getManifests(standaloneNextDir);
+
+  const { optimizeCss } = manifests.config.experimental;
+
   // Copy .next/static/css from standalone to output dir
   // needed for optimizeCss feature to work
-  cpSync(
-    path.join(standaloneNextDir, "static", "css"),
-    path.join(outputNextDir, "static", "css"),
-    { recursive: true },
-  );
+  if (optimizeCss) {
+    cpSync(
+      path.join(standaloneNextDir, "static", "css"),
+      path.join(outputNextDir, "static", "css"),
+      { recursive: true },
+    );
+  }
 
   logger.debug("copyTracedFiles:", Date.now() - tsStart, "ms");
 
   return {
     tracedFiles,
     nodePackages,
-    manifests: getManifests(standaloneNextDir),
+    manifests,
   };
 }
diff --git a/packages/open-next/src/types/next-types.ts b/packages/open-next/src/types/next-types.ts
index 83cfb66c5..face7fbaa 100644
--- a/packages/open-next/src/types/next-types.ts
+++ b/packages/open-next/src/types/next-types.ts
@@ -82,6 +82,7 @@ export interface NextConfig {
   experimental: {
     serverActions?: boolean;
     appDir?: boolean;
+    optimizeCss?: boolean;
   };
   images: ImageConfig;
   poweredByHeader?: boolean;