feat: add css files to server bundle for optimizeCss feature to work

packages/open-next/src/build/copyTracedFiles.ts

@@ -2,6 +2,7 @@ import url from "node:url";
 
 import {
   copyFileSync,
+  cpSync,
   existsSync,
   mkdirSync,
   readFileSync,
@@ -331,17 +332,17 @@ File ${serverPath} does not exist
       );
     }
   };
+
+  const manifests = getManifests(standaloneNextDir);
+  const { config, prerenderManifest, pagesManifest } = manifests;
+
   // Get all the static files - Should be only for pages dir
   // Ideally we would filter only those that might get accessed in this specific functions
   // Maybe even move this to s3 directly
   if (hasPageDir) {
     // First we get truly static files - i.e. pages without getStaticProps
-    const staticFiles: Array<string> = Object.values(
-      loadPagesManifest(standaloneNextDir),
-    );
+    const staticFiles: Array<string> = Object.values(pagesManifest);
     // Then we need to get all fallback: true dynamic routes html
-    const prerenderManifest = loadPrerenderManifest(standaloneNextDir);
-    const config = loadConfig(standaloneNextDir);
     const locales = config.i18n?.locales;
     Object.values(prerenderManifest.dynamicRoutes).forEach((route) => {
       if (typeof route.fallback === "string") {
@@ -360,11 +361,21 @@ 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
+  if (config.experimental.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,
   };
 }

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;