next.js

fa32daad - Add `unstable_catchError()` API for custom error boundary (#89688)

Add `unstable_catchError()` API for custom error boundary (#89688) This PR adds `unstable_catchError()` API for a granular custom error boundary. The error component generated by this API is not a true component format, as the wrapper provides additional args. Therefore, the API is a function call by design rather than a boundary component to avoid merging the `errorInfo` with the user-provided props from the wrapper. This API works for both the App/Pages Router. However, `retry()` is not allowed in Pages Router as it depends on `router.refresh()`, and will throw. Also, it's exported from `next/error` as there was already an `Error` component for the [Pages Router](https://nextjs.org/docs/pages/building-your-application/routing/custom-error#reusing-the-built-in-error-page). ### DevTools <img width="508" height="90" alt="CleanShot 2026-03-13 at 03 02 46@2x" src="https://github.com/user-attachments/assets/8b79b1f6-877d-4901-99f7-6a2b4d3e34fe" /> Docs to follow up: https://github.com/vercel/next.js/pull/89847 Closes NAR-768 --------- Co-authored-by: Josh Story <story@hey.com>