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fec-data-fetching

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Use when implementing or reviewing frontend server-state flows: typed queries, request caching, invalidation, mutations, optimistic updates, infinite queries, prefetch, SSR hydration, or API-layer integration. Do not use for local UI state or Service Worker caching; Chinese triggers include data fetch, cache, optimistic updates.

skills/fec-data-fetching/SKILL.md

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Nov 8, 2026
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# Server State data acquisition

## Purpose

Establish clear data acquisition, caching, invalidation and submission boundaries for front-end server state to avoid request state being scattered among page components.

## Procedure

1. Determine the source of the state: use the request caching scheme when it comes from the server and needs caching, deduplication, refreshing, paging or mutation; use component state or store for purely local UI state.
2. First use the existing data acquisition library of the project; when adding dependencies, you can consider TanStack Query for React/Vue/Solid/Svelte, or you can also use SWR, Nuxt/Nitro data acquisition or project encapsulation.
3. Stable design cache key/query key: The structure contains entities, actions and all parameters that affect the results.
4. The API function remains a pure request function, and the data hook/composable is responsible for cache, select, loading/error/empty status.
5. Invalidation after mutation succeeds; use optimistic update when immediate feedback is needed and rollback when failure occurs.
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