test: launch QA standalone server as CommonJS

scripts/release-v2-qa/runtime.mts

@@ -90,7 +90,8 @@ export const createCandidateBuildPaths = (candidateSha: string) => {
     buildDir,
     standaloneRoot,
     standaloneAppDir,
-    serverPath: path.join(standaloneAppDir, "server.js"),
+    generatedServerPath: path.join(standaloneAppDir, "server.js"),
+    serverPath: path.join(standaloneAppDir, "server.cjs"),
     markerPath: path.join(buildDir, "qa-build-manifest.json"),
   };
 };
@@ -431,6 +432,9 @@ const ensureCandidateBuild = async (runRoot: string, candidateSha: string) => {
     await mkdir(path.dirname(staticTarget), { recursive: true });
     await cp(path.join(buildPaths.buildDir, "static"), staticTarget, { recursive: true, force: true });
     await cp(path.join(buildPaths.appRoot, "public"), publicTarget, { recursive: true, force: true });
+    // The app package is ESM, while Next emits a CommonJS standalone launcher.
+    // Give the generated launcher an explicit CommonJS extension before executing it.
+    await rename(buildPaths.generatedServerPath, buildPaths.serverPath);
     const serverStats = await stat(buildPaths.serverPath);
     if (!serverStats.isFile()) throw new Error(`Standalone server is missing after build: ${buildPaths.serverPath}`);
     await writeJsonAtomic(buildPaths.markerPath, {

scripts/release-v2-qa/runtime.spec.ts

@@ -139,7 +139,8 @@ describe("release-v2 QA app execution contract", () => {
     const paths = createCandidateBuildPaths("0123456789abcdef0123456789abcdef01234567");
 
     expect(paths.distDirName).toBe(".next-qa/release-v2-0123456789abcdef0123456789abcdef01234567");
-    expect(paths.serverPath).toBe(`${paths.buildDir}/standalone/apps/nextjs/server.js`);
+    expect(paths.generatedServerPath).toBe(`${paths.buildDir}/standalone/apps/nextjs/server.js`);
+    expect(paths.serverPath).toBe(`${paths.buildDir}/standalone/apps/nextjs/server.cjs`);
     expect(paths.standaloneRoot).toBe(`${paths.buildDir}/standalone`);
     expect(() => createCandidateBuildPaths("not-a-commit")).toThrow(/40-character lowercase commit SHA/u);
   });