Deployment & Infrastructure

When to use this skill

• Deploying the portfolio to Vercel or Cloudflare
• Troubleshooting failed builds or deployments
• Managing environment variables across environments
• Rolling back to a previous deployment
• Configuring domains, SSL, or edge functions
• Debugging build-time vs runtime errors

Workflow

1. Pre-deployment checks

Run the full verification suite before any deployment:

npx tsc --noEmit          # TypeScript must pass
npm run lint               # ESLint must pass
npm run test -- --run      # Tests must pass
npm run doctor             # React-doctor must be 100/100
npm run build              # Build must succeed

If any step fails, fix it before deploying. Never deploy broken code.

2. Vercel deployment

Local preview (production-like):

npm run build && npm run start

Vercel CLI deploy:

npx vercel --prod          # Production deployment
npx vercel                 # Preview deployment (branch)

Vercel environment variables:

Variable	Environment	Required
NEXT_PUBLIC_SANITY_PROJECT_ID	All	Yes
NEXT_PUBLIC_SANITY_DATASET	All	Yes
SANITY_API_READ_TOKEN	All	Yes
SANITY_REVALIDATE_SECRET	All	Yes
NEXT_PUBLIC_UMAMI_WEBSITE_ID	Production	No
NEXT_PUBLIC_UMAMI_SCRIPT_URL	Production	No
NEXT_PUBLIC_UMAMI_HOST_URL	Production	No

Check env vars are set:

npx vercel env ls

3. Cloudflare deployment

The repo uses opennextjs-cloudflare for Cloudflare compatibility:

npm run cloudflare:build     # Build for Cloudflare
npm run cloudflare:dev       # Local Cloudflare dev
npm run cloudflare:deploy    # Deploy to Cloudflare

Cloudflare-specific notes:

• output: 'standalone' is disabled on Windows (isWindows check in next.config.js)
• Edge runtime is NOT used -- the repo uses Node.js runtime for API routes
• wrangler.toml configures Workers bindings

4. Build troubleshooting

Common build errors:

Error	Cause	Fix
Module not found	Missing dependency	npm install
Type error	TypeScript strict mode	Fix the type error in the source
Hydration mismatch	Server/client HTML differ	Check useEffect guards, mounted state
Circular dependency	Import cycle	Refactor to break the cycle
ENOMEM	Out of memory	Increase Node memory: NODE_OPTIONS="--max-old-space-size=4096"

Build analysis:

ANALYZE=true npm run build   # Bundle analyzer (if configured)

5. Rollback procedure

Vercel rollback:

npx vercel rollback          # Roll back to previous deployment
npx vercel rollback <url>    # Roll back to specific deployment

Git rollback:

git log --oneline -10        # Find the commit to roll back to
git revert <commit-hash>     # Create a revert commit
git push                     # Trigger redeployment

Emergency: force deploy last known good:

git checkout <good-commit> -- .
git commit -m "chore: emergency rollback to <good-commit>"
git push

6. Domain and SSL

Vercel manages SSL automatically. For custom domains:

npx vercel domains add <domain>

Verify DNS records point to Vercel's nameservers or use CNAME to cname.vercel-dns.com.

Common mistakes

• Deploying without running npm run build locally first
• Forgetting to set environment variables in the Vercel dashboard
• Using console.log in production code (use reportWebVitals instead)
• Not testing the production build locally before pushing

Delivery checks

• npm run build succeeds locally
• All environment variables are set in the target environment
• Production URL loads correctly
• No console errors in browser DevTools
• Service worker registers correctly (if applicable)
• Sanity data loads and revalidation works
• OG images and meta tags render correctly