### Why?
Should come up with better solution that does not block PRs with git
conflict
x-ref:
https://vercel.slack.com/archives/C02CDC2ALJH/p1785263902728189?thread_ts=1785263687.502649&cid=C02CDC2ALJH
### How?
- Delete `errors.json`, the error-code SWC plugin, generated WASM, merge
driver, and validation/build tooling.
- Stop attaching error codes to server-rendering digests, redboxes, and
telemetry; native `Error.code` and `Error.name` remain available where
applicable.
- Remove the development-overlay error feedback UI, middleware, and
telemetry event that depended on stable codes.
- Update fixtures, snapshots, and guidance for code-free errors and
numeric-only digests.
<!-- NEXT_JS_LLM -->
This PR removes the deprecated sync access to Dynamic APIs.
- Removed UnsafeUnwrapped* types.
- Replaced `as unknown as UnsafeUnwrapped ` type casts to `as any` for
dev warning.
- Removed tests that expected sync access to not error.
- Removed `UntrackedExotic` functions.
- Modified tests that were accidentally doing sync access.
- Updated warnings to emphasize that it is a Promise and must be
awaited.
- Removed paragraph that states access is allowed from
`errors/sync-dynamic-apis.mdx`.
---------
Co-authored-by: Josh Story <story@hey.com>
The `legacyBehavior` prop of the `Link` component has been deprecated
since #77473. For Next.js 16, we're finally removing support for it.
Consequently, we're also removing support for the `passHref` prop, which
was only useful in conjunction with the `legacyBehavior` prop.
A [codemod is
available](https://nextjs.org/docs/app/guides/upgrading/codemods#new-link)
to help you automatically upgrade your codebase.
reverts #77473
---------
Co-authored-by: Sebastian Sebbie Silbermann <sebastian.silbermann@vercel.com>
Fix font loading from a non-root URL:
Repro:
```
pnpm next dev test/development/app-dir/owner-stack/
```
and Visit http://localhost:3000/browser/uncaught
Shows
```
GET /browser/__nextjs_font/geist-latin.woff2 404 in 330ms
```
I forgot to exclude `.test.` files from the next error code plugin. This
caused a bunch of errors codes from test files to pollute `errors.json`.
I added a filter to exclude the test files and then reset `errors.json`.
This update introduces a custom `swc-plugin` for Next.js that appends a
non-enumerable `__NEXT_ERROR_CODE` property to all `Error` instances,
enabling anonymous telemetry while keeping error codes hidden from
console logs. The plugin manages error codes through an append-only
`/packages/next/errors.json` file, which is automatically updated during
the `pnpm build` process using a two-pass system to ensure consistent
error mapping, even during concurrent builds.
Jiwon Choi