From 41e5258744c12eba3ba0205fbe22207c0ea545ba Mon Sep 17 00:00:00 2001
From: James <james@eli.cx>
Date: Thu, 19 Mar 2026 18:09:59 +0000
Subject: [PATCH 1/2] fix: throw errors when next config parse fails

---
 packages/vinext/src/config/next-config.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/vinext/src/config/next-config.ts b/packages/vinext/src/config/next-config.ts
index cb057a3be..4c59de328 100644
--- a/packages/vinext/src/config/next-config.ts
+++ b/packages/vinext/src/config/next-config.ts
@@ -274,7 +274,9 @@ function warnConfigLoadFailure(filename: string, err: Error): void {
     stack.includes("next-intl/plugin") ||
     stack.includes("next-intl/dist");
 
-  console.warn(`[vinext] Failed to load ${filename}: ${msg}`);
+  console.log();
+  console.error(`[vinext] Failed to load ${filename}: ${msg}`);
+  console.log();
   if (isNextIntlPlugin) {
     console.warn(
       "[vinext] Hint: createNextIntlPlugin() is not needed with vinext. " +
@@ -338,12 +340,12 @@ export async function loadNextConfig(
           return await unwrapConfig({ default: mod }, phase);
         } catch (e2) {
           warnConfigLoadFailure(filename, e2 as Error);
-          return null;
+          throw e2;
         }
       }
 
       warnConfigLoadFailure(filename, e as Error);
-      return null;
+      throw e;
     }
   }
 

From d6fe0228fa2f562663dce1081e12f55ff69e005d Mon Sep 17 00:00:00 2001
From: James <james@eli.cx>
Date: Thu, 19 Mar 2026 18:18:57 +0000
Subject: [PATCH 2/2] add unit test

---
 tests/next-config.test.ts | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/tests/next-config.test.ts b/tests/next-config.test.ts
index 358c96db7..0c381c7f8 100644
--- a/tests/next-config.test.ts
+++ b/tests/next-config.test.ts
@@ -1,4 +1,4 @@
-import { describe, it, expect, afterEach, vi } from "vite-plus/test";
+import { describe, it, expect, afterEach, vi, beforeEach } from "vite-plus/test";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
@@ -18,6 +18,31 @@ function makeTempDir(): string {
   return fs.mkdtempSync(path.join(os.tmpdir(), "vinext-config-test-"));
 }
 
+describe("invalid config files", () => {
+  let tmpDir: string;
+
+  beforeEach(() => {
+    tmpDir = makeTempDir();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+    if (tmpDir) {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  });
+
+  it("should throw an error when loading a config fails", async () => {
+    fs.writeFileSync(path.join(tmpDir, "package.json"), `{ "type": "module" }`);
+    fs.writeFileSync(
+      path.join(tmpDir, "next.config.js"),
+      `const path = require('path');\n module.exports = {};\n`,
+    );
+
+    await expect(loadNextConfig(tmpDir, PHASE_PRODUCTION_BUILD)).rejects.toThrow();
+  });
+});
+
 describe("loadNextConfig phase argument", () => {
   let tmpDir: string;