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docs: add Next.js 14 to 16 migration discussion document
Create comprehensive discussion document outlining the proposed migration from Next.js 14 to 16, including breaking changes, risk assessment, and migration strategy for team review and feedback.
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‎MIGRATION_DISCUSSION.md‎

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# Discussion: Migration from Next.js 14 to Next.js 16
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## Overview
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This document outlines the proposed migration of our Mantine Analytics Dashboard from **Next.js 14.2.26** to **Next.js 16** (stable release, October 2025). This is a significant upgrade that requires careful planning and team discussion.
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## Current Stack
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| Package | Current Version |
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|---------|-----------------|
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| Next.js | 14.2.26 |
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| React | 18.2.0 |
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| React DOM | 18.2.0 |
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| TypeScript | 5.1.6 |
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| Node.js | 20.x |
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## What's New in Next.js 16
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### Performance Improvements
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- **Turbopack (Stable & Default)** - 2-5x faster production builds, up to 10x faster Fast Refresh
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- **React Compiler (Stable)** - Automatic memoization of components, reducing unnecessary re-renders
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- **Layout Deduplication** - Shared layouts downloaded once instead of per-link (major prefetching optimization)
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### New Features
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- **React 19.2 Support** - View Transitions, `useEffectEvent`, Activity API
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- **Cache Components** - Stable `cacheLife` and `cacheTag` APIs (no more `unstable_` prefix)
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- **Next.js DevTools MCP** - AI-assisted debugging integration
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- **Partial Pre-Rendering (PPR)** - Enhanced with `use cache` for instant navigation
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### Architecture Changes
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- **Proxy replaces Middleware** - New `proxy.ts` file for network boundary operations
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- Edge runtime NOT supported in proxy
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- Runtime is Node.js only (not configurable)
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## Breaking Changes & Migration Requirements
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### 1. React 18 → React 19 Migration (High Impact)
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This is the most significant change. React 19 introduces:
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- New hooks and APIs
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- Stricter hydration requirements
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- Changes to ref handling
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- Potential breaking changes in third-party libraries
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**Action Required:** Update all React dependencies and audit component compatibility.
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### 2. Middleware → Proxy Migration (High Impact)
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Our current `middleware.ts` handles:
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- Route protection
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- Authentication redirects
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- Session validation
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**Action Required:** Convert `middleware.ts` to `proxy.ts` with Node.js runtime constraints.
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### 3. Dependency Compatibility Audit (Medium Impact)
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Libraries requiring verification:
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| Package | Concern |
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|---------|---------|
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| `@mantine/next` (6.0.16) | May need updates for Next.js 16 |
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| `next-auth` (4.24.12) | React 19 / Next.js 16 compatibility |
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| `@storybook/nextjs` (7.5.3) | React 19 compatibility |
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| `mantine-datatable` (7.1.7) | React 19 compatibility |
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| `react-apexcharts` (1.4.1) | React 19 compatibility |
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| `@tiptap/*` packages | React 19 compatibility |
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### 4. TypeScript & Node.js Requirements
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- **Node.js 20.9+** required (we currently meet this)
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- **TypeScript 5+** required (we currently meet this)
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## Risk Assessment
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### High Risk
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- React 19 migration may break third-party component libraries
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- Middleware to proxy conversion could affect authentication flow
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- Storybook may require significant updates for React 19
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### Medium Risk
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- Mantine components may have undocumented React 19 issues
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- Build configuration changes with Turbopack default
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- NextAuth session handling changes
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### Low Risk
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- TypeScript compatibility (already on 5.x)
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- Node.js compatibility (already on 20.x)
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- Basic routing (App Router unchanged)
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## Proposed Migration Strategy
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### Phase 1: Preparation
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1. Create feature branch for migration
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2. Audit all dependencies for React 19 / Next.js 16 compatibility
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3. Document current middleware functionality
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4. Set up comprehensive testing plan
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### Phase 2: Core Migration
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1. Update React to 19.2
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2. Update Next.js to 16.x
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3. Convert `middleware.ts` to `proxy.ts`
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4. Fix TypeScript errors and breaking changes
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### Phase 3: Dependency Updates
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1. Update Mantine packages (if new versions available)
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2. Update or replace incompatible libraries
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3. Update Storybook for React 19
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### Phase 4: Testing & Validation
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1. Test all authentication flows
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2. Test all dashboard pages and components
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3. Verify Storybook builds
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4. Performance benchmarking
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## Benefits of Migration
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1. **Performance** - Significantly faster builds and development experience
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2. **Future-proofing** - Access to latest React features and optimizations
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3. **Developer Experience** - React Compiler eliminates manual memoization
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4. **AI Tooling** - DevTools MCP for enhanced debugging
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## Questions for Discussion
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1. **Timeline**: When should we target this migration? Is there urgency?
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2. **Testing**: Do we need to establish a test suite before migration?
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3. **Fallback Plan**: Should we maintain a Next.js 14 branch during transition?
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4. **Dependencies**: Are there alternative libraries we should consider for incompatible packages?
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5. **Incremental vs Big Bang**: Should we attempt Next.js 15 first, or jump directly to 16?
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## Resources
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- [Next.js 16 Release Blog](https://nextjs.org/blog/next-16)
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- [Next.js 16 Upgrade Guide](https://nextjs.org/docs/app/guides/upgrading/version-16)
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- [React 19 Migration Guide](https://react.dev/blog/2024/04/25/react-19-upgrade-guide)
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## Next Steps
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Please review this proposal and share your thoughts:
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- [ ] Approve migration approach
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- [ ] Identify critical dependencies to audit first
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- [ ] Establish timeline
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- [ ] Assign migration tasks
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---
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**Created**: November 2025
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**Status**: Open for Discussion
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**Branch**: `claude/migrate-nextjs-14-to-16-018AEf4kj5QQZmkK3amqwrLm`

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