Remix Cache Skill

Expert guidance for using remix-cache, a production-ready caching library for Remix applications.

When to use this skill

Use this skill when the user asks about:

• Implementing caching in Remix applications
• Redis-backed caching strategies
• Cache invalidation (by key, tag, or pattern)
• Real-time cache synchronization with SSE
• Stale-while-revalidate patterns
• Type-safe cache definitions
• React hooks for automatic revalidation
• Performance optimization with caching
• Server vs serverless caching modes
• Circuit breaker patterns for cache failures

Quick reference

Basic setup

// app/cache.server.ts
import { createCache } from 'remix-cache/server'

export const cache = createCache({
  redis: { host: process.env.REDIS_HOST, port: 6379 },
  prefix: 'myapp',
})

export const userCache = cache.define({
  name: 'user',
  key: (userId: string) => userId,
  fetch: async (userId: string) => db.user.findUnique({ where: { id: userId } }),
  ttl: 300,
})

Use in loaders

export async function loader({ params }: LoaderFunctionArgs) {
  const user = await userCache.get(params.userId)
  return json({ user })
}

Invalidation

// By key
await cache.invalidate({ key: 'myapp:user:123' })

// By tag
await cache.invalidateByTag('product')

// By pattern
await cache.invalidateByPattern('user:*')

Real-time React revalidation

// app/root.tsx
<CacheProvider endpoint="/api/cache-events">
  <Outlet />
</CacheProvider>

// Component
useCache({ tags: ['user'], debounce: 200 })

Detailed documentation

For comprehensive guidance on specific topics, see:

• GETTING_STARTED.md - Installation, setup, and first cache definition
• API_REFERENCE.md - Complete API documentation for all methods and options
• PATTERNS.md - Common caching patterns and best practices
• REACT_INTEGRATION.md - SSE setup and React hooks for real-time invalidation
• EXAMPLES.md - Real-world examples (e-commerce, sessions, API caching)
• TROUBLESHOOTING.md - Common issues and solutions
• TESTING.md - Testing strategies and patterns

Key capabilities

1. Type-safe cache definitions

Perfect TypeScript inference for cache keys and values. See API_REFERENCE.md.

2. Advanced TTL strategies

• Stale-while-revalidate: Serve stale data while fetching fresh
• Sliding window: Reset TTL on each access
• Conditional TTL: Dynamic TTL based on data See PATTERNS.md.

3. Multi-level invalidation

• By key: Invalidate specific entries
• By tag: Invalidate groups of related entries
• By pattern: Invalidate using glob patterns
• Cascading: Automatic dependent invalidation See API_REFERENCE.md.

4. Real-time synchronization

• SSE endpoint: Stream invalidation events to clients
• React hooks: Automatic revalidation on cache changes
• Filtering: Revalidate only for specific keys/tags/patterns See REACT_INTEGRATION.md.

5. Resilience features

• Circuit breaker: Graceful degradation when Redis fails
• Request deduplication: Prevent cache stampede
• Error events: Monitor and track failures See PATTERNS.md.

6. Deployment flexibility

• Server mode: Two-tier caching (local LRU + Redis)
• Serverless mode: Redis-only with versioned keys See API_REFERENCE.md.

File structure in this repository

The remix-cache library is organized as:

src/
├── server/           # Server-side cache implementation
│   ├── cache.ts      # Main cache class
│   ├── definition.ts # Cache definition implementation
│   ├── sse-handler.ts # SSE endpoint generator
│   ├── local-cache.ts # In-memory LRU cache
│   ├── circuit-breaker.ts # Circuit breaker pattern
│   └── deduplicator.ts # Request deduplication
├── react/            # React integration
│   ├── provider.tsx  # CacheProvider component
│   ├── use-cache.ts  # useCache hook
│   └── context.tsx   # React context
├── types/            # TypeScript type definitions
│   ├── cache.ts
│   ├── definition.ts
│   └── events.ts
└── utils/            # Utility functions
    ├── key-builder.ts     # Cache key generation
    ├── pattern-match.ts   # Glob pattern matching
    └── env-detect.ts      # Environment detection

Common workflows

Setting up a new cache

1. Read GETTING_STARTED.md for basic setup
2. Create cache instance in

   app/cache.server.ts

3. Define cache definitions for your data types
4. Use in loaders/actions
5. Set up SSE endpoint for real-time invalidation (see REACT_INTEGRATION.md)
6. Add React hooks to components that need auto-revalidation

Implementing cache invalidation

1. Identify invalidation strategy (key/tag/pattern)
2. Add tags to cache definitions if needed
3. Call invalidation methods in actions
4. Verify invalidation events are fired
5. Test React components revalidate correctly

Debugging cache issues

1. Check TROUBLESHOOTING.md for common issues
2. Enable event listeners to monitor cache behavior
3. Verify Redis connection and configuration
4. Check circuit breaker state
5. Inspect SSE connection in browser DevTools

Writing tests

See TESTING.md for:

• Unit testing cache definitions
• Integration testing with Redis
• Mocking cache in tests
• Testing invalidation logic
• Testing React components with cache

Environment variables

REDIS_HOST=localhost
REDIS_PORT=6379
REDIS_PASSWORD=your-password
CACHE_PREFIX=myapp
CACHE_DEFAULT_TTL=300
NODE_ENV=production

Implementation notes

When helping users implement remix-cache:

1. Always ensure type safety: The library provides perfect TypeScript inference
2. Consider deployment mode: Ask if serverless or server-based
3. Plan invalidation strategy: Tags are more flexible than keys
4. Set appropriate TTLs: Balance freshness with performance
5. Monitor errors: Always set up error event listeners
6. Test thoroughly: Cache bugs can be subtle, see TESTING.md
7. Close connections: Especially important in tests

Getting help

For specific topics:

• New to the library? → GETTING_STARTED.md
• Looking for API details? → API_REFERENCE.md
• Need implementation patterns? → PATTERNS.md and EXAMPLES.md
• Setting up React integration? → REACT_INTEGRATION.md
• Encountering issues? → TROUBLESHOOTING.md
• Writing tests? → TESTING.md

Version

This skill covers remix-cache v0.1.0 with complete implementation of Phases 1-5:

• ✅ Core caching with Redis backend
• ✅ Type-safe cache definitions
• ✅ Stale-while-revalidate
• ✅ Sliding window TTL
• ✅ Pattern & tag-based invalidation
• ✅ Circuit breaker pattern
• ✅ Request deduplication
• ✅ Server/serverless modes
• ✅ SSE real-time invalidation
• ✅ React hooks for auto-revalidation