Individual skill
react-query-pro
Manage server state with TanStack Query: queries, mutations, caching, invalidation, optimistic updates, and pagination. Use when fetching/mutating remote data in React.
skills/react-query-pro/SKILL.md
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# React Query Pro
A practical guide to TanStack Query (React Query): treating **server state** as a cache with declarative fetching — queries, mutations, invalidation, optimistic updates, and pagination — instead of hand-rolled `useEffect` fetching.
## Overview
Server state (data from an API) is fundamentally different from client state (UI toggles): it's async, shared, potentially stale, and needs syncing. TanStack Query manages it as a **normalized cache keyed by query keys**, with background refetching, retries, and deduping built in. The payoff: delete most data-fetching `useEffect`s and get loading/error/retry/polling behavior for free.
## When to use
- Fetching REST/GraphQL data in React (queries).
- Mutations with cache invalidation or optimistic updates.
- Pagination, infinite scroll.
- Dependent/parallel queries, polling, prefetching.