Vercel: “Error: Command "npm run build" exited with 1”

What it means

The production build hits an error that dev mode tolerated (type errors, lint, missing env vars).

How to fix it

Run npm run build locally, fix the first error, and add env vars in Vercel settings.

Paste this into Vercel

Stop retrying previous fixes. I'm getting this error: "Error: Command "npm run build" exited with 1". Likely cause: The production build hits an error that dev mode tolerated (type errors, lint, missing env vars). Before editing, show me the relevant files and confirm the root cause. Then: Run npm run build locally, fix the first error, and add env vars in Vercel settings. Change only what's necessary, don't delete working code, don't add new libraries unless required, and tell me exactly what you changed and how to verify it.