vercel.json

{
  "version": 2,
  "buildCommand": "npm run build",
  "installCommand": "npm install",
  "framework": "nextjs",
  "regions": ["sin1"],
  "env": {
    "NEXTAUTH_URL": "https://${VERCEL_URL}",
    "NEXTAUTH_SECRET": "${NEXTAUTH_SECRET}"
  },
  "build": {
    "env": {
      "PRISMA_GENERATE": "true"
    }
  }
}