Summary

This release (v4.12.13) includes a TypeScript typing fix for handler response inference and two new feature additions: a skip option for the trailing-slash middleware and an onCacheNotAvailable callback for caching behavior. No breaking changes are indicated.

Key Points

• fix(types): Type inference for app.on now derives the response type from the last handler in the 9-/10-handler overloads.
  • If you depend on accurate response typings from long handler-chains, you should see improved inference; adjust any manual generics if you previously worked around the issue.
• feat(trailing-slash): Added a skip option to the trailing-slash middleware.
  • Use skip to conditionally bypass trailing-slash handling for specific requests, e.g. trailingSlash({ skip: req => req.url.startsWith('/api') }).
• feat(cache): Added onCacheNotAvailable option.
  • Provide a callback to handle cases where the cache is unavailable: cache({ onCacheNotAvailable: (req, ctx) => { /* fallback logic */ } }).

Upgrade Notes

• These are additive and intended to be backward compatible. Verify TypeScript typings in code paths that rely on long handler overloads and remove any prior manual workarounds if they are now redundant.

Contributors

• yusukebe (release author)
• T4ko0522 (first-time contributor)