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react-fetch-cache-patterns

React data-fetching patterns at scale — recommender carousels, infinite feeds, pages with many parallel fetches, dashboards. Covers request orchestration (parallelism, batching, deduplication), cache strategy (keys, normalization, staleTime, SWR), backend protection (concurrency caps, debounce/throttle, jittered retries, circuit breakers), prefetching (route loaders, hover/intent, idle, server hydration), failure resilience (AbortController, timeouts, error boundaries, stale fallback, idempotent mutations), and feed/carousel patterns (virtualization, cursor pagination, summary/detail split). Includes 5 ready-to-use scaffolding templates (resource query hook, carousel data loader, infinite feed, hover-prefetch link, request collapser). Trigger when building, reviewing, or refactoring React components that fetch data — even if the user doesn't explicitly mention "performance" or "scale".

skills/.experimental/react-fetch-cache-patterns/SKILL.md

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# Experimental React Data Fetching & Caching Best Practices

Implementation patterns for React applications that fetch and cache many API requests without overwhelming the backend. **48 rules across 8 categories**, ordered by execution lifecycle impact — earlier categories cascade through everything downstream. Templates show both library-based (TanStack Query, SWR) **and library-free** (pure React + AbortController) implementations so the patterns are usable regardless of stack constraints.

## When to Apply

- Writing or reviewing a React component that calls `fetch`, `useQuery`, `useSWR`, or any data-fetching hook
- Designing a list, feed, or carousel that displays many items each requiring data
- Investigating "the backend is getting hammered" or "the page loads slowly" symptoms
- Choosing between client-side fetching, route loaders, server components, or SSR
- Implementing prefetch, retry, optimistic updates, or any failure-handling logic
- Refactoring code that already does data fetching but with waterfalls, no cache strategy, or no concurrency limits

## Rule Categories by Priority