Improve response parser and retry logic

[MattCCC]

This pull request introduces several updates to enhance response handling, improve retry logic, and add comprehensive React integration tests for POST body cache key updates. The most important changes include refining response parsing, optimizing retry behavior, and adding new test cases to ensure robust functionality.

Improvements to response handling:

• Updated the parseResponseData function in src/response-parser.ts to simplify the null-check logic, ensuring early bail-out if the response is null or undefined. ([src/response-parser.tsL36-R37](https://github.com/MattCCC/fetchff/pull/96/files#diff-97e3cd5bba7d4c11711764da1f6ef23ac92ddb501c128d56a6cb8ef9fbadf3c2L36-R37))

Enhancements to retry logic:

• Modified the withRetry function in src/retry-handler.ts to optimize performance by passing the correct stale revalidation flag based on the current attempt number. ([src/retry-handler.tsL143-R146](https://github.com/MattCCC/fetchff/pull/96/files#diff-04bf635c85ebe8501d4c9012c897b82735c289e4c6acea39d00495363a1a19d4L143-R146))

Additions to React integration tests:

• Added a new test case in test/react/integration/hook.spec.tsx to verify that the cache key is regenerated and the updated POST body is used when refetching. This ensures that changes in the request body are correctly reflected in subsequent API calls. ([test/react/integration/hook.spec.tsxR1665-R1740](https://github.com/MattCCC/fetchff/pull/96/files#diff-c0a889a6a01eb10df459bfee63587049bef683dd842fff4337882ef396b18fdbR1665-R1740))
• Introduced a dedicated test file, test/react/integration/post-body-cache-key.spec.tsx, to validate POST body updates and their effect on cache keys, UI state, and refetch behavior. This test ensures consistent behavior with static cache keys and dynamic request bodies. ([test/react/integration/post-body-cache-key.spec.tsxR1-R67](https://github.com/MattCCC/fetchff/pull/96/files#diff-cfd4cbca98162d0e540d8f83e5c54b5d003a0c279914549e5db77189d0cb53b2R1-R67))

[github-actions]

size-limit report 📦

Path	Size
dist/browser/index.mjs	5.38 KB (-0.08% 🔽)
dist/browser/index.global.js	5.54 KB (-0.2% 🔽)
dist/node/index.js	5.45 KB (-0.11% 🔽)
dist/react/index.mjs	8.41 KB (-0.09% 🔽)
dist/react/index.js	9.13 KB (-0.08% 🔽)

[devdgna]

+1