diff --git a/nextjs-app/__tests__/app/nextConfig.test.ts b/nextjs-app/__tests__/app/nextConfig.test.ts
new file mode 100644
index 0000000..a378151
--- /dev/null
+++ b/nextjs-app/__tests__/app/nextConfig.test.ts
@@ -0,0 +1,49 @@
+/**
+ * next.config.mjs carries the staging noindex rule. Breaking it turns
+ * stx.schoolcompare.co.uk into a fully crawlable duplicate of production,
+ * and nothing else in the suite would notice.
+ *
+ * The non-null assertions are deliberate: every key asserted here is optional
+ * on NextConfig, and a missing one is precisely the regression under test, so
+ * the assertion below should fail the test rather than the compile.
+ */
+import nextConfig from '@/next.config.mjs';
+
+async function headerRules() {
+  return nextConfig.headers!();
+}
+
+describe('next.config.mjs', () => {
+  it('keeps the staging host out of the index', async () => {
+    const headers = await headerRules();
+    const stagingRule = headers.find((rule) =>
+      rule.has?.some(
+        (cond) => cond.type === 'host' && cond.value === 'stx.schoolcompare.co.uk',
+      ),
+    );
+    expect(stagingRule).toBeDefined();
+    expect(stagingRule!.headers).toContainEqual({
+      key: 'X-Robots-Tag',
+      value: 'noindex, nofollow',
+    });
+  });
+
+  it('still emits standalone output for the Docker runner', () => {
+    expect(nextConfig.output).toBe('standalone');
+  });
+
+  it('still traces the share-card fonts into the standalone bundle', () => {
+    expect(nextConfig.outputFileTracingIncludes!['/opengraph-image']).toEqual([
+      './assets/**',
+    ]);
+  });
+
+  it('still allows the analytics subdomain to frame the site', async () => {
+    const headers = await headerRules();
+    const csp = headers
+      .flatMap((rule) => rule.headers)
+      .find((header) => header.key === 'Content-Security-Policy');
+    expect(csp).toBeDefined();
+    expect(csp!.value).toContain('https://analytics.schoolcompare.co.uk');
+  });
+});
diff --git a/nextjs-app/next.config.js b/nextjs-app/next.config.mjs
similarity index 99%
rename from nextjs-app/next.config.js
rename to nextjs-app/next.config.mjs
index c282b97..d35e4be 100644
--- a/nextjs-app/next.config.js
+++ b/nextjs-app/next.config.mjs
@@ -127,4 +127,4 @@ const nextConfig = {
   },
 };
 
-module.exports = nextConfig;
+export default nextConfig;