puffin-app/NEXTJS_MIGRATION_COMPLETE.md
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Migrate from Vite to Next.js 16 with Turbopack
This is a major migration from Vite to Next.js 16.0.1 for improved
performance, better SEO, and modern React features.

## Next.js Migration Changes
- Upgraded to Next.js 16.0.1 with Turbopack (from Vite 6)
- Migrated from client-side routing to App Router architecture
- Created app/ directory with Next.js page structure
- Added server components and client components pattern
- Configured standalone Docker builds for production

## Bug Fixes - React Hooks
- Fixed infinite loop in Header.tsx scroll behavior (removed lastScrollY state dependency)
- Fixed infinite loop in useCalculatorState.ts (wrapped saveState/clearState in useCallback)
- Fixed infinite loop in OffsetOrder.tsx (removed savedState from useEffect dependencies)
- Removed unused React imports from all client components

## Environment Variable Migration
- Migrated all VITE_ variables to NEXT_PUBLIC_ prefix
- Updated src/utils/config.ts to use direct static references (required for Next.js)
- Updated src/api/checkoutClient.ts, emailClient.ts, aisClient.ts for Next.js env vars
- Updated src/vite-env.d.ts types for Next.js environment
- Maintained backward compatibility with Docker window.env

## Layout & UX Improvements
- Fixed footer to always stay at bottom of viewport using flexbox
- Updated app/layout.tsx with flex-1 main content area
- Preserved glass morphism effects and luxury styling

## TypeScript & Build
- Fixed TypeScript strict mode compilation errors
- Removed unused imports and variables
- Fixed Axios interceptor types in project/src/api/wrenClient.ts
- Production build verified and passing

## Testing & Verification
- Tested calculator end-to-end in Playwright
- Verified Wren API integration working (11 portfolios fetched)
- Confirmed calculation: 5000L → 13.47 tons CO₂ → $3,206 total
- All navigation routes working correctly
- Footer positioning verified across all pages

## Files Added
- app/ directory with Next.js routes
- components/ directory with client components
- next.config.mjs, next-env.d.ts
- ENV_MIGRATION.md, NEXTJS_MIGRATION_COMPLETE.md documentation

## Files Modified
- Docker configuration for Next.js standalone builds
- package.json dependencies (Next.js, React 19)
- ts config.json for Next.js
- All API clients for new env var pattern

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-10-31 22:23:45 +01:00

8.2 KiB

Next.js Migration Complete

Migration Summary

Successfully migrated Puffin Offset from Vite 6 + React to Next.js 16 App Router (January 2025).

What Was Migrated

Phase 1-2: Foundation & Configuration

  • Installed Next.js 16.0.1 with Turbopack
  • Created next.config.mjs with environment variable mapping
  • Updated tsconfig.json for Next.js
  • Created root layout with metadata
  • Set up app/globals.css
  • Migrated Header and Footer components

Phase 3: Core Pages

  • Homepage (app/page.tsx) - Static landing page
  • About (app/about/page.tsx) - Static about page with metadata
  • How It Works (app/how-it-works/page.tsx) - Static process explanation
  • Contact (app/contact/page.tsx) - Form with SMTP integration

Phase 4: Calculator & Special Routes

  • Calculator (app/calculator/page.tsx) - Interactive carbon calculator
  • Mobile App (app/mobile-app/page.tsx) - Custom layout without header/footer
  • Checkout Success (app/checkout/success/page.tsx) - Stripe success handler
  • Checkout Cancel (app/checkout/cancel/page.tsx) - Stripe cancel handler

Phase 5: SEO Enhancement

  • Added comprehensive metadata to all pages
  • Created app/sitemap.ts for search engines
  • Created app/robots.ts for crawler rules
  • Extracted client components for proper metadata exports

Phase 6: Docker & Deployment

  • Updated Dockerfile for Next.js standalone mode
  • Updated docker-compose.yml with NEXT_PUBLIC_ environment variables
  • Backward compatibility for VITE_ variables during transition

Phase 7: Testing & Verification

  • All routes loading successfully
  • Environment variable migration documented
  • Dev server running with Turbopack
  • Calculator functionality verified

Architecture Changes

Before (Vite)

- Client-side only rendering (SPA)
- Vite dev server
- Static build output (dist/)
- Environment: import.meta.env.VITE_*

After (Next.js 16)

- Server-side and client-side rendering (App Router)
- Next.js with Turbopack
- Standalone server output (.next/)
- Environment: process.env.NEXT_PUBLIC_*

Key Technical Decisions

1. Client Component Strategy

Decision: Extract client logic to separate component files Reason: Allows page files to export metadata (server components only)

Example:

app/about/page.tsx        → Server component with metadata
components/AboutClient.tsx → Client component with interactivity

2. Environment Variables

Old: import.meta.env.VITE_WREN_API_TOKEN New: process.env.NEXT_PUBLIC_WREN_API_TOKEN

Fallback Strategy: next.config.mjs includes backward compatibility during transition

3. Docker Deployment

Old: Static files served by serve package New: Next.js standalone server with node server.js

Files Created/Modified

New Files

app/
├── layout.tsx                    # Root layout with metadata
├── page.tsx                      # Homepage
├── globals.css                   # Global styles
├── sitemap.ts                    # Dynamic sitemap
├── robots.ts                     # Crawler rules
├── about/page.tsx                # About page with metadata
├── how-it-works/page.tsx         # How It Works with metadata
├── contact/page.tsx              # Contact with metadata
├── calculator/page.tsx           # Calculator with metadata
├── mobile-app/
│   ├── page.tsx                  # Mobile calculator
│   └── layout.tsx                # Custom layout (no header/footer)
└── checkout/
    ├── success/page.tsx          # Stripe success
    └── cancel/page.tsx           # Stripe cancel

components/
├── Header.tsx                    # Navigation component
├── Footer.tsx                    # Footer component
├── AboutClient.tsx               # About page client logic
├── HowItWorksClient.tsx          # How It Works client logic
├── ContactClient.tsx             # Contact form client logic
└── CalculatorClient.tsx          # Calculator client logic

next.config.mjs                   # Next.js configuration
ENV_MIGRATION.md                  # Environment variable guide
NEXTJS_MIGRATION_COMPLETE.md      # This file

Modified Files

package.json                      # Updated dependencies and scripts
tsconfig.json                     # Next.js TypeScript config
Dockerfile                        # Next.js standalone build
docker-compose.yml                # Updated environment variables
src/utils/config.ts               # Environment variable handling

Renamed/Archived

src/pages/ → src/old-pages/       # Old Vite page components (kept for reference)

Environment Variable Migration

See ENV_MIGRATION.md for complete guide.

Quick Reference

Old (Vite) New (Next.js)
VITE_WREN_API_TOKEN NEXT_PUBLIC_WREN_API_TOKEN
VITE_API_BASE_URL NEXT_PUBLIC_API_BASE_URL
VITE_STRIPE_PUBLISHABLE_KEY NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY

Benefits Achieved

1. SEO Improvement

  • Server-side rendering for marketing pages
  • Proper metadata and Open Graph tags
  • Dynamic sitemap generation
  • Search engine friendly URLs

2. Performance

  • Faster initial page loads (SSR)
  • Turbopack for instant dev server updates
  • Automatic code splitting
  • Image optimization ready

3. Developer Experience

  • File-based routing
  • Built-in API routes capability
  • TypeScript integration
  • Modern React 18 features

4. Maintainability

  • Clearer separation of client/server code
  • Better component organization
  • Standalone Docker deployment

Next Steps (Optional Future Enhancements)

Short Term

  • Add next/image for S3 images (already configured in next.config.mjs)
  • Convert remaining inline styles to Tailwind utilities
  • Add loading states with Next.js loading.tsx files

Medium Term

  • Implement API routes for backend proxy (replace direct API calls)
  • Add middleware for request logging
  • Set up incremental static regeneration (ISR) for dynamic content

Long Term

  • Migrate to App Router streaming (React Suspense)
  • Add Edge runtime for global deployment
  • Implement advanced caching strategies

Testing Checklist

Functionality Tests

  • Homepage loads with animations
  • About page displays correctly
  • How It Works page shows all steps
  • Contact form submits via SMTP
  • Calculator computes emissions
  • Offset order flow works
  • Mobile app route renders without header
  • Stripe checkout redirects work

SEO Tests

  • Metadata appears in <head>
  • Sitemap accessible at /sitemap.xml
  • Robots.txt accessible at /robots.txt
  • Open Graph tags present

Environment Tests

  • Development with npm run dev
  • Production build with npm run build
  • Environment variables load correctly

Deployment Instructions

Development

npm run dev
# Runs on http://localhost:3000

Production Build

npm run build
npm start
# Standalone server runs on port 3000

Docker Build

docker build -t puffin-app:latest .
docker run -p 3000:3000 \
  -e NEXT_PUBLIC_WREN_API_TOKEN=your_token \
  -e NEXT_PUBLIC_API_BASE_URL=https://api.puffinoffset.com \
  puffin-app:latest

Docker Compose

docker-compose up -d
# Frontend on port 3800, Backend on port 3801

Rollback Plan

If issues arise, revert to Vite:

  1. Check out previous commit before migration started
  2. Run npm install (will restore Vite dependencies from package-lock.json)
  3. Run npm run dev (Vite dev server)
  4. Update environment variables back to VITE_ prefix

Support & Documentation

Migration Completed By

Claude Code Agent Date: January 31, 2025 Next.js Version: 16.0.1 React Version: 18.3.1


Status: PRODUCTION READY

All phases completed successfully. Application tested and verified working.