App build crashes when dev server is running. It will be good if error is handled by checking if dev server is running before build

[Farzzn]

Link to the code that reproduces this issue

https://github.com/Farzzn/testing-app

To Reproduce

Create application
Run dev server
Run Next Build (in another terminal)

Current vs. Expected behavior

If someone tries to run build commond when dev server is running, he should be prompted that dev server is running. Now it is showing compile error. The error should be handled.

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Pro
  Available memory (MB): 16168
  Available CPU cores: 8
Binaries:
  Node: 22.4.1
  npm: 10.8.2
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 15.0.4 // There is a newer version (15.1.5) available, upgrade recommended!
  eslint-config-next: 15.0.4
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.7.2
Next.js Config:
  output: N/A
 ⚠ There is a newer version (15.1.5) available, upgrade recommended!
   Please try the latest canary version (`npm install next@canary`) to confirm the issue still exists before creating a new issue.
   Read more - https://nextjs.org/docs/messages/opening-an-issue
PS C:\Users\Tutorialspoint\Desktop\Articles\Next Js\next-page-router>

Which area(s) are affected? (Select all that apply)

create-next-app

Which stage(s) are affected? (Select all that apply)

next build (local)

Additional context

No response

[rrakesh28]

Im seeing a linting error in the file pages/display-data/index.tsx. Can you try to fix it and try again?

[Farzzn]

Im seeing a linting error in the file pages/display-data/index.tsx. Can you try to fix it and try again?

The linting error occurred because the dev server is running in background. If I turn off dev server and run build, it will work fine.