next.js/test/e2e/app-dir/preferred-region

preferredRegion Test

This test demonstrates the successful implementation of preferredRegion configuration support for Node.js runtime in Next.js App Router.

Test Structure

• app/api/test/route.ts - Node.js runtime route handler with preferredRegion = "iad1" and maxDuration = 100
• app/api/test-edge/route.ts - Edge runtime route handler with preferredRegion = "iad1" and maxDuration = 100

What the Test Shows

✅ Node.js Runtime (NOW WORKS!)

• Route handler exports preferredRegion = "iad1" and maxDuration = 100
• Gets processed and stored in functions-config-manifest.json as:

  {
    "/api/test": {
      "maxDuration": 100,
      "regions": ["iad1"]
    }
  }
  

• Deployment platforms can now read regions for Node.js runtime

✅ Edge Runtime (CONTINUES TO WORK)

• Route handler exports preferredRegion = "iad1" and maxDuration = 100
• Gets processed and stored in both manifests:
  • functions-config-manifest.json under functions["/api/test-edge"]
  • middleware-manifest.json under functions["/api/test-edge/route"]