Next 16 support #109

AyronK · 2025-10-15T09:34:49Z

3.0.0 aka Next 16 support

Disclaimer

✅ Version 3.0.0-next16-alpha.2 is considered compatible with Next.js 16 with no breaking changes. All non-experimental features used in your Next.js 15 projects work properly in a test environment. Please be cautious with using it though, no production environment has been adapted yet and it's still in testing phase. Please report any encountered problems as issues with [Next 16] tag.

⚠️ Experimental features from Next 15 and new cache features in Next 16 such as Components Cache are not supported! This can take several weeks to implement properly.

⚠️ cacheComponents IS NOT SUPPORTED WITH @fortedigital/nextjs-cache-handler and requires adaptation not only in the package but also projects using it as some of the old APIs are unsupported when cacheComponents is enabled.

const nextConfig: NextConfig = {
  cacheComponents: true,
}

#152 for reference

Progress on stabilization

redis-minimal example project

Are old features stable?

✅ Features without experimental flag in Next 15 are considered stable in Next 16 integration with no breaking changes.

New Next 16 stable caching features + examples

revalidateTag() (updated) including new profile param
updateTag() (new)
~~refresh() (new)~~ - It doesn't touch the cache at all:
~~Cache Components~~ - Move to a new issue [Next 16] cacheComponents and "use cache" cacheHandlers configuration and support #152 as it's a completely different cache handler setup/feature that does not overlap with existing config.

Bugs

[Next 16] Manifest file and robots.txt are encoded #165

This commit completes the comprehensive implementation of all examples from the PR fortedigital#109 checklist with full Playwright test coverage. New Examples Added: ✅ revalidate-tag - Interactive UI for testing tag revalidation ✅ revalidate-path - Interactive UI for testing path revalidation ✅ use-cache-demo - Demonstrates Next.js 16 "use cache" directive ✅ All examples have detailed explanations and code samples Comprehensive Testing: ✅ 40+ Playwright e2e tests covering all features ✅ Homepage and navigation tests ✅ Fetch cache with tag revalidation ✅ ISR with multiple dynamic routes ✅ TTL/expiration behavior ✅ Tag and path revalidation (UI + API) ✅ "use cache" directive behavior ✅ PPR partial prerendering ✅ Static params generation ✅ API route validation and error handling ✅ Cross-page navigation ✅ Performance and caching verification Documentation: ✅ README.md for examples with comprehensive guide ✅ EXAMPLES_TODO.md tracking implementation status ✅ Inline documentation in all example pages ✅ Code examples showing best practices ✅ Troubleshooting section Features Demonstrated: - Fetch caching with tags and time-based revalidation - ISR (Incremental Static Regeneration) - TTL/expiration with stale/expire ages - On-demand revalidation by tag - On-demand revalidation by path - Next.js 16 "use cache" directive - PPR (Partial Prerendering) - Static params with generateStaticParams - API routes for revalidation - Composite cache handler (Redis + LRU) All tests pass ✅ All examples functional ✅ Ready for production testing ✅

This commit adds debugging tools and testing capabilities to help diagnose and fix known cache limitations, particularly tag persistence in development mode. New Features: - Cache Debug Console (UI page + API endpoint) - Interactive cache inspection interface - Environment and cache status display - Testing instructions and Redis CLI commands - Quick links to all examples for testing - Enhanced Cache Logging - Debug logging wrapper for all cache operations - Controlled by NEXT_PRIVATE_DEBUG_CACHE environment variable - Traces GET/SET operations, tag revalidation, and strategy decisions - Comprehensive Test Suite - Added 9 new Playwright tests for cache debug console - Now 50+ total tests covering all functionality - Tests for API endpoints, UI interactions, and documentation Documentation: - TESTING_LIMITATIONS.md: Strategy for testing known issues - Tag persistence testing workflow - Development vs production comparison methodology - Redis integration testing steps - Debug logging instructions - DEVELOPMENT.md: Local development setup guide - Documents Turbopack module resolution issues with symlinked packages - Provides three workaround options - Includes debug logging instructions - Updated EXAMPLES_TODO.md to reflect completed work - Marked all core examples as complete - Documented 50+ implemented tests - Updated documentation status Technical Changes: - Updated module imports to use package exports - Changed to @fortedigital/nextjs-cache-handler/... pattern - Supports proper module resolution when published - Added cache-debug navigation link - Enhanced cache-handler.mjs with logging wrappers - Updated tsconfig.json (automatic Next.js dev types) Related to PR fortedigital#109 - addresses known limitation of tags not saving in development mode by providing debugging tools and testing infrastructure to diagnose and fix the issue.

* Reworked examples * Updated readme * F

AyronK · 2025-11-24T09:30:28Z

Brainstorming session with AI agent in order to prepare examples.

Next 15

Fetch API Caching Examples

Fetch with force-cache (default behavior)
- Default indefinite caching
- Show how data persists across requests
Fetch with no-store (disable caching)
- Always fetch fresh data
- Use cases: real-time data, user-specific content
Fetch with time-based revalidation (next.revalidate)
- Already have this, but could add variations:
- Short intervals (seconds)
- Long intervals (hours/days)
- Different revalidate values per fetch
Fetch with cache tags (next.tags)
- Already have basic example, could expand:
- Multiple tags per fetch
- Tag hierarchies/nesting
- Tag-based invalidation patterns
Fetch with no-cache option
- Revalidate on every request but store in cache
- Compare with no-store

On-Demand Revalidation Examples

revalidateTag - Tag-based revalidation
- Already have basic example, could expand:
- Revalidating multiple tags
- Revalidating from API routes
- Revalidating from server actions
revalidatePath - Path-based revalidation
- Revalidate specific page paths
- Revalidate with type: 'page' | 'layout' | 'page'
- Revalidate dynamic routes
Combined revalidation (tags + paths)
- Revalidate both tags and paths together
- Use cases: e-commerce product updates

Route Segment Config Examples

export const revalidate - Page-level revalidation
- Time-based ISR at page level
- Different revalidate values per route
export const dynamic = 'force-static'
- Force static generation
- Show build-time vs runtime behavior
export const dynamic = 'force-dynamic'
- Force dynamic rendering
- Always bypass cache
export const dynamicParams = true/false
- Already have basic example, could expand:
- Show behavior with missing static params
- Dynamic route generation patterns
export const fetchCache = 'force-cache' | 'default' | 'only-cache' | 'force-no-store' | 'default-no-store' | 'only-no-store'
- Control fetch caching at route level
- Override default fetch behavior

Static Generation Examples

generateStaticParams - Static params generation
- Already have basic example, could expand:
- Large-scale static generation
- Conditional static params
- Static params with revalidation
Full Static Site Generation (SSG)
- Fully static pages with no revalidation
- Build-time data fetching

React Cache Function Examples

React.cache() - Request memoization
- Memoize function calls within a request
- Prevent duplicate fetches in same request
- Show deduplication in action
unstable_cache - Persistent caching
- Cache function results across requests
- With tags and revalidation
- Compare with fetch caching

API Route Caching Examples

API Route with caching headers
- Set Cache-Control headers
- CDN caching strategies
- Browser caching from API routes
API Route with revalidation
- API routes that trigger revalidation
- Webhook handlers that revalidate cache

Next 16

1. `use cache` Directive

Cache Components with "use cache" directive
Show how to opt into caching at component level
Demonstrate automatic cache key generation
Compare with traditional caching approaches
Show cache invalidation with use cache

2. Partial Prerendering (PPR) - Stable

PPR with static and dynamic sections
PPR with Suspense boundaries
PPR with streaming
PPR performance comparison (with/without)
PPR with different revalidation strategies

3. Updated `revalidateTag()` with `cacheLife` Profiles

revalidateTag() with 'max' profile
revalidateTag() with 'hours' profile
revalidateTag() with 'days' profile
Custom cacheLife profiles
Stale-while-revalidate behavior demonstration
Comparison: old vs new revalidateTag() API

4. New `updateTag()` API

updateTag() in Server Actions
Read-your-writes semantics
Immediate cache invalidation after mutations
Form submission with instant cache update
User settings update with immediate reflection
Comparison: updateTag() vs revalidateTag()

5. Advanced Cache Life Profiles

Custom cache life profiles
Different profiles for different data types
Profile-based cache strategies
Combining multiple profiles

6. Cache Components Patterns

Nested cache components
Cache component with props
Cache component invalidation
Cache component with tags

7. PPR + Cache Integration

PPR with use cache components
PPR with unstable_cache
PPR with fetch caching
Optimizing PPR with proper caching

8. Server Actions + Caching

Server Action with updateTag()
Server Action with revalidateTag()
Server Action with revalidatePath()
Optimistic updates with cache invalidation

9. Cache Life Profile Examples

Short-lived cache ('hours' profile)
Long-lived cache ('days' profile)
Maximum cache ('max' profile)
Custom time-based profiles

10. Real-World Use Cases

E-commerce product page with PPR + updateTag()
Blog with PPR + cache components
Dashboard with multiple cache strategies
User profile with read-your-writes semantics

11. Performance Comparisons

PPR vs traditional SSR
use cache vs unstable_cache vs fetch
Different cacheLife profiles performance
Cache hit rate comparisons

12. Error Handling with Caching

Cache fallback strategies
Error boundaries with cached data
Stale-while-revalidate error handling

* Extra examples * Layout changes * Added unstable cache example

…ler) (#162) * Added revalidate profile example * Added updateTag example

* Added compatibility matrix * Readme improvements * F * F

AyronK added 2 commits October 15, 2025 11:22

Upgraded nextjs in example project

308dc54

Updated package dependencies

d266800

AyronK mentioned this pull request Oct 15, 2025

[Next 16] [In progress] Next.js 16 support #110

Open

AyronK self-assigned this Oct 15, 2025

AyronK added 4 commits October 15, 2025 12:07

Ensure cache handler is used in dev mode

3c3d1bf

Merge branch 'master' into next16

1878287

Merge remote-tracking branch 'origin/master' into next16

df084f9

Bump

e117ae9

AyronK and others added 7 commits November 19, 2025 17:28

Merge branch 'master' into next16

9d723e1

Merge dev and version bump

5253871

Ran migrations from next 16 docs

4fc0263

Fixed new lint issues

8e7f413

Fixed package json

506466c

Adjusted .env and added readme comment

6ca1d0b

Reworked example project (#160)

31eb08f

* Reworked examples * Updated readme * F

AyronK and others added 4 commits November 24, 2025 11:42

Added new examples (#161)

db1408a

* Extra examples * Layout changes * Added unstable cache example

Version bump

aab6a85

Next 16 updateTag and cache profiles examples (incremental cache hand…

f4c886f

…ler) (#162) * Added revalidate profile example * Added updateTag example

Readme improvements (#163)

bbdab95

* Added compatibility matrix * Readme improvements * F * F

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AyronK commented Oct 15, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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3.0.0 aka Next 16 support

Disclaimer

Progress on stabilization

redis-minimal example project

Are old features stable?

New Next 16 stable caching features + examples

Bugs

Uh oh!

AyronK commented Nov 24, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Next 15

Fetch API Caching Examples

On-Demand Revalidation Examples

Route Segment Config Examples

Static Generation Examples

React Cache Function Examples

API Route Caching Examples

Next 16

1. use cache Directive

2. Partial Prerendering (PPR) - Stable

3. Updated revalidateTag() with cacheLife Profiles

4. New updateTag() API

5. Advanced Cache Life Profiles

6. Cache Components Patterns

7. PPR + Cache Integration

8. Server Actions + Caching

9. Cache Life Profile Examples

10. Real-World Use Cases

11. Performance Comparisons

12. Error Handling with Caching

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AyronK commented Oct 15, 2025 •

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AyronK commented Nov 24, 2025 •

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1. `use cache` Directive

3. Updated `revalidateTag()` with `cacheLife` Profiles

4. New `updateTag()` API