fix: enable using workerd process v2 (#903)

Author: vicb

.changeset/stale-adults-divide.md

@@ -0,0 +1,7 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+fix: enable using workerd process v2
+
+process v2 is an updated version of `node:process` active by default after 2025-09-15

examples/playground15/wrangler.jsonc

@@ -2,7 +2,7 @@
 	"$schema": "node_modules/wrangler/config-schema.json",
 	"main": ".open-next/worker.js",
 	"name": "playground15",
-	"compatibility_date": "2024-12-30",
+	"compatibility_date": "2025-09-15",
 	"compatibility_flags": ["nodejs_compat", "global_fetch_strictly_public", "enable_request_signal"],
 	"assets": {
 		"directory": ".open-next/assets",

packages/cloudflare/src/cli/build/bundle-server.ts

@@ -16,7 +16,7 @@ import { inlineFindDir } from "./patches/plugins/find-dir.js";
 import { patchInstrumentation } from "./patches/plugins/instrumentation.js";
 import { inlineLoadManifest } from "./patches/plugins/load-manifest.js";
 import { patchNextServer } from "./patches/plugins/next-server.js";
-import { patchResolveCache } from "./patches/plugins/open-next.js";
+import { patchResolveCache, patchSetWorkingDirectory } from "./patches/plugins/open-next.js";
 import { handleOptionalDependencies } from "./patches/plugins/optional-deps.js";
 import { patchPagesRouterContext } from "./patches/plugins/pages-router-context.js";
 import { patchDepdDeprecations } from "./patches/plugins/patch-depd-deprecations.js";
@@ -107,6 +107,7 @@ export async function bundleServer(buildOpts: BuildOptions, projectOpts: Project
 			patchRouteModules(updater, buildOpts),
 			patchDepdDeprecations(updater),
 			patchResolveCache(updater, buildOpts),
+			patchSetWorkingDirectory(updater, buildOpts),
 			// Apply updater updates, must be the last plugin
 			updater.plugin,
 		] as Plugin[],

packages/cloudflare/src/cli/build/patches/plugins/open-next.ts

@@ -45,3 +45,32 @@ rule:
 fix: |-
   var composableCacheHandlerPath = "";
 `;
+
+export function patchSetWorkingDirectory(updater: ContentUpdater, buildOpts: BuildOptions): Plugin {
+	const { outputDir } = buildOpts;
+	const packagePath = getPackagePath(buildOpts);
+	const outputPath = path.join(outputDir, "server-functions/default");
+
+	const indexPath = path.relative(
+		buildOpts.appBuildOutputPath,
+		path.join(outputPath, packagePath, `index.mjs`)
+	);
+
+	return updater.updateContent("do-not-set-working-directory", [
+		{
+			filter: getCrossPlatformPathRegex(indexPath),
+			contentFilter: /function setNextjsServerWorkingDirectory\(/,
+			callback: async ({ contents }) => patchCode(contents, workingDirectoryRule),
+		},
+	]);
+}
+
+// `setNextjsServerWorkingDirectory` calls `process.chdir("")` which errors because the directory does not exists
+// See https://github.com/opennextjs/opennextjs-cloudflare/issues/899
+export const workingDirectoryRule = `
+rule:
+  pattern: function setNextjsServerWorkingDirectory() { $$$BODY }
+fix: |-
+    function setNextjsServerWorkingDirectory() {
+    }
+`;