- Add optional requestKey parameter to UseFetchDataOptions
- Implement module-level cache (inFlightRequests) to track in-flight requests
- When requestKey is provided, multiple hook instances with same key share in-flight requests
- Prevents duplicate API calls when multiple components fetch same data or rapid refresh calls
- Cache entries are automatically cleared when response arrives (success or error)
- Maintains backward compatibility: without requestKey, behaves as before
- Adds comprehensive tests for deduplication scenarios
This reduces bandwidth waste and prevents race conditions caused by concurrent requests for identical data.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Eliminates ~100 lines of duplicated code across useListData and usePolledData
by creating a composable base hook that handles:
- Abort controller lifecycle and cancellation
- Loading/error state management
- Fetch error handling
- Unmount cleanup
Changes:
- Create hooks/useFetchData.ts with base fetch lifecycle (no effects on consumers)
- Refactor useListData to compose useFetchData, returns items array by default
- Refactor usePolledData to compose useFetchData, adds polling and focus-refetch
- Add comprehensive tests for useFetchData base hook
- Document hook architecture and composition pattern in Web-Development.md
Result: Both hooks now use shared primitives, reducing maintenance burden
and ensuring consistent cancellation/error handling across all data fetches.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
