### What?
This fixes an issue where the `nonce` attribute isn't set on
`next/script` elements that has the `afterInteractive` (the default)
strategy resulting in `<link rel="preload" as="script"/>` tags without a
nonce.
### Why?
For apps that uses 3rd party scripts (or any script) with a nonce loaded
via `next/script` this is necessary unless you want them all to use
`beforeInteractive` which isn't super nice for performance.
---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
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Fixes#63871
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### What?
Adds safe traversal to rewrite `has` items in a certain new
(`isInterceptionRouteRewrite()` added in the v14.2.0 canaries) check to
the rewrite routes.
### Why?
The new check assumed that all `has` arrays had at least one item, when
previously Next.js accepted rewrites with empty `has`. Adding safe
traversal doesn't negatively impact the check, as the check only needs
rewrites with the first item.
Fixes#63871
---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
## Description
Refactor the [Next.js
CLI](https://nextjs.org/docs/app/api-reference/next-cli) to use
[commander](https://github.com/tj/commander.js) instead of
[arg](https://github.com/vercel/arg).
## Why?
- Auto-generated, properly formatted help command + output. With `arg`,
much of the help commands were manually added via a single
`console.log`, causing deviations over time.
- Ergonomic, ease of adding new subcommands and rules
## Breaking Changes
- Update the experimental `next experimental-compile` and `next
experimental-generate` build commands in favor of `next build
--experimental-build-mode=compile/generate`
---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
To ensure that we properly cache data for routes that change based on `Next-URL` (which is used for route interception), this adjusts how we set the `Vary` header to conditionally include `Next-URL`.
The `Next-URL` request header only impacts the response for routes that are intercepted. When we detect that path we're handling could be intercepted, we add `Next-URL` to the vary. This signals in #61235 to prefix these cache entries with `nextUrl` if the response might vary based on it.
Closes NEXT-2398
### What
#### Core
This PR respect the error's digest when recieves new error occurred from
server side, and it will be logged into client on production with the
same `digest` property.
If we discover the original RSC error in SSR error handler, retrieve the
original error
#### Tests
* Move the errors related tests from `test/e2e/app-dir/app` to a
separate test suite `test/e2e/app-dir/errors`
* Add a new test case for logging the original RSC error
* Add a new test case for logging the original Server Action error
### Why
This will help associate the `digest` property of the errors logged from
client with the actual generated server errors. Previously they're
different as we might re-compute the digest proper in handler that react
server renderer thinks it's a new error, which causes we have 2
different errors logged on server side, and 1 logged on client side. The
one on client side can associate to the server errors but it's from
react renderer which is not the original error.
Closes NEXT-2094
Fixes#60684
Refining the message that uses "use with caution" instead of "use at
your own risk" as some experimental features was functionally stable but
we can't bring them as default for now and need to test as experiments
Closes NEXT-2286
### 🧐 What's in there?
`config.analyticsId` is a rarely-used mechanism, initially intended to
Next.js users hosting their application themselves and willing to report
Core Web Vitals to Vercel Speed Insights.
This platform specific mechanism can be replaced with the built-in
[`useReportWebVitals`](https://nextjs.org/docs/app/api-reference/functions/use-report-web-vitals).
### 🧪 How to test?
1. make a new Next.js app
1. define env variable `VERCEL_ANALYTICS_ID` to a dummy value
1. start your application in dev mode:
```shell
⚠ config.analyticsId is deprecated and will be removed in next major
version. Read more:
https://nextjs.org/docs/messages/deprecated-analyticsid
▲ Next.js 14.0.5-canary.58
- Local: http://localhost:3000
✓ Ready in 917ms
```
1. build your application:
```shell
▲ Next.js 14.0.5-canary.58
Creating an optimized production build ...
✓ Compiled successfully
Linting and checking validity of types .
⚠ The Next.js plugin was not detected in your ESLint configuration. See
https://nextjs.org/docs/basic-features/eslint#migrating-existing-config
✓ Linting and checking validity of types
✓ Collecting page data
✓ Generating static pages (4/4)
⚠ `config.analyticsId` is deprecated and will be removed in next major
version. Read more:
https://nextjs.org/docs/messages/deprecated-analyticsid
```
1. remove the env variable, add a `next.config.js` file with a dummy
`analyticsId` variable:
```js
module.exports = { analyticsId: "UA-12345678-9" };
```
1. start your application in dev mode: it'll issue the same warning.
1. build your application: it'll issue the same warning.
---------
Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
This PR introduces 2 experimental options for doing more work in the
webpack build in parallel instead of in serial. These options may
improve the performance of builds at the cost of more memory.
`parallelServerAndEdgeCompiles`: This option kicks off the builds for
both `server` and `edge-server` at the same time instead of waiting for
each to complete before the next one. In applications that have many
server and edge functions, this can increase performance by doing that
work in parallel. This can be used with `next build` or `next
experimental-compile`.
`parallelServerBuildTraces`: This option starts the server build traces
as soon as the server compile completes and runs it in the background
while the other compilations are happening. With this option enabled,
some unnecessary work may be done since ordinarily the client
compilation provides information that can reduce the amount of tracing
necessary. However, since it is in parallel with the other work, it may
still result in a faster build in total at the cost of more memory. This
option is already the default when using `next experimental-compile` but
can now be used when `next build` is used also.
---------
Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>
Co-authored-by: JJ Kasper <jj@jjsweb.site>
In #59725 I skipped this test in PPR prod mode, but not dev because CI
wasn't failing for dev. The idea was to investigate the failure
post-merge because it wasn't block-worthy.
But the test did fail in dev mode when CI ran on canary. So this updates
the guard to skip in dev, too.
Will follow up with a PR to fix the test itself.
Closes NEXT-1913
For a more detailed explanation of the algorithm, refer to the comments
in ppr-navigations.ts. Below is a high-level overview.
### Step 1: Render the prefetched data immediately
Immediately upon navigation, we construct a new Cache Node tree (i.e.
copy-on-write) that represents the optimistic result of a navigation,
using both the current Cache Node tree and data that was prefetched
prior to navigation.
At this point, we haven't yet received the navigation response from the
server. It could send back something completely different from the tree
that was prefetched — due to rewrites, default routes, parallel routes,
etc.
But in most cases, it will return the same tree that we prefetched, just
with the dynamic holes filled in. So we optimistically assume this will
happen, and accept that the real result could be arbitrarily different.
We'll reuse anything that was already in the previous tree, since that's
what the server does.
New segments (ones that don't appear in the old tree) are assigned an
unresolved promise. The data for these promises will be fulfilled later,
when the navigation response is received.
The tree can be rendered immediately after it is created. Any new trees
that do not have prefetch data will suspend during rendering, until the
dynamic data streams in.
### Step 2: Fill in the dynamic data as it streams in
When the dynamic data is received from the server, we can start filling
in the unresolved promises in the tree. All the pending promises that
were spawned by the navigation will be resolved, either with dynamic
data from the server, or `null` to indicate that the data is missing.
A `null` value will trigger a lazy fetch during render, which will then
patch up the tree using the same mechanism as the non-PPR implementation
(serverPatchReducer).
Usually, the server will respond with exactly the subset of data that
we're waiting for — everything below the nearest shared layout. But
technically, the server can return anything it wants.
This does _not_ create a new tree; it modifies the existing one in
place. Which means it must follow the Suspense rules of cache safety.
## To Do
Not all necessarily PR-blocking, since the status quo is that
navigations don't work at all when PPR is enabled
- [x] Figure out how to handle dynamic metadata. Need to switch from
prefetched metadata to final.
- [x] Some mistake related to parallel routes, need to look into failing
tests
Closes NEXT-1894
Before PPR, the way instant navigations work in Next.js is we prefetch
everything up to the first route segment that defines a loading.js
boundary. The rest of the tree is defered until the actual navigation.
It does not take into account whether the data is dynamic — even if the
tree is completely static, it will still defer everything inside the
loading boundary.
The approach with PPR is different — we prefetch as deeply as possible,
and only defer when dynamic data is accessed. If so, we only defer the
nearest parent Suspense boundary of the dynamic data access, regardless
of whether the boundary is defined by loading.js or a normal <Suspense>
component in userspace.
This PR removes the partial behavior of loading.js when the PPR flag is
enabled. In effect, loading.js now acts like a regular Suspense boundary
with no additional special behavior.
Note that in practice this usually means we'll end up prefetching more
than we were before PPR, which may or may not be considered a
performance regression by some apps. The plan is to address this before
General Availability of PPR by introducing granular per-segment
fetching, so we can reuse as much of the tree as possible during both
prefetches and dynamic navigations. But during the beta period, we
should be clear about this trade off in our communications.
## Testing strategy
While I was writing a test, I noticed that it's currently pretty
difficult to test all the scenarios that PPR is designed to handle, so I
gave special attention to setting up a testing strategy that I hope will
make this easier going forward. The overall pattern is based on how
we've been testing concurrent rendering features in the React repo for
many years:
- In the e2e test, spin up an HTTP server for responding to requests
sent by the test app. This simulates the data service that would be used
in a real Next.js application, whether it's direct db access, an ORM, or
a higher-level data access layer. The e2e test can observe when
individual requests are received, and control the timing of when the
data is fulfilled, without needing to mock any lower level I/O. (We're
already using a similar pattern to [test fetch
deduping](a3616d33ed/test/e2e/app-dir/app-fetch-deduping/app-fetch-deduping.test.ts (L8-L29)).)
- Each time a request is received, write to an event log. Then assert on
the result of the log at different points throughout the test. This
helps catch subtle mistakes where the order of events is not expected,
or the same event happens more than it should.
(I wrote some test helpers, but to avoid early abstraction, I've
intentionally not moved them into a separate module.)
Closes NEXT-1779
### What?
When a layout segment forces dynamic rendering (such as with
`force-dynamic` or `revalidate: 0`), navigating to sub-pages of that
layout will attempt to re-render the layout, also resulting in side
effects re-running. This means if your layout relies on a data fetch and
you render the result of that data in the layout, it will unexpectedly
change when navigating between sub-paths, as described in #57326.
As a separate issue (but caused by the same underlying mechanism), when
using `searchParams` on a dynamic page, changes to those search params
will be erroneously ignored when navigating, as described in #57075
### Why?
As a performance optimization we generate static prefetch files for
dynamic segments ([original
PR](https://github.com/vercel/next.js/pull/54403)). This makes it so
that when prefetching is turned on, the prefetch can be served quickly
from the edge without needing to invoke unnecessarily. We're able to
eagerly serve things that can be safely prefetched. This is nice for
cases where a path has a `loading.js` that we can eagerly render while
waiting for the dynamic data to be loaded.
This causes a problem with layouts that opt into dynamic rendering: when
the page loads and a prefetch is kicked off for the sub-page, it'll load
the static prefetch, which won't be generated with the same router state
as the dynamically rendered page. This causes a mismatch between the two
trees, and when navigating within the same segment, a refetch will be
added to the router because it thinks that it's navigating to a new
layout.
This also causes issues for dynamic pages that use `searchParams`. The
static prefetch will be generated without any knowledge of search
params, and when the prefetch occurs, we still match to the prefetch
generated without search params. This will make the router think that no
change occurs, and the UI will not update to reflect the change.
### How?
There's ongoing work by @acdlite to refactor the client router.
Hopefully it will be easier to re-land this once that work is finished.
For now, I've reverted the behavior as it doesn't seem to be worth the
bugs it currently causes. I've also added tests so that when we do
re-land this behavior, we can catch these subtleties.
Fixes#57326Fixes#57075
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
This removes the ignores for dev react bundles which was added as an
optimization but causes issues when react is imported from an ESM module
since all requires are being analyzed for named exports.
Fixes#57582
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### Why?
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This PR therefore introduces to always set response status code to 500
unless it is a `NotFoundError` or `RedirectError`. This PR would fix
issue #56235. See also:
https://codesandbox.io/p/sandbox/nice-panini-2z3mcp .
**Current Behavior**
At the moment, when an unexpected error occurs during app server
rendering, a 200 ok is returned as status code. This seems to be
undesirable because of the success status CDNs will cache the error
pages and crawlers will index the page considering the error content as
the actual content.
**Desired Behavior**
This issue is related to discussion
https://github.com/vercel/next.js/discussions/53225. Even though I
understand that the response status code cannot be set if streaming has
started, in my view it would be best to set the response status to 500
whenever it can (so before the streaming has started) for SEO and (CDN)
http caching. This would also be consistent with how 404s currently
work; that is, response status code is set to 404 if `NotFoundError`
occurred before streaming (related
[issue](https://github.com/vercel/next.js/issues/43831) &
[PR](https://github.com/vercel/next.js/pull/55542)).
Ideally, when a runtime error happens after streaming, a `<meta
name="robots" content="noindex" />` would also be added. But I didn't
want to make the PR too complex before receiving feedback.
---------
Co-authored-by: Vũ Văn Dũng <me@joulev.dev>
Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>
Since Turbopack doesn't use eval-source-map the CSP nonce will pass correctly, nice improvement over the current state where you can't check CSP in dev.
Fixes a bunch of the Turbopack test failures for `test/e2e/app-dir/app/index.test.ts`. Not sure how this passed with webpack before as the dep was indeed missing.
When the function name is omitted webpack generates a name from the loader config which can be really long un-necessarily. Providing a name for the default function alleviates this. cc @shuding who found this
Today when we hydrate an SSR'd RSC response on the client we encounter import chunks which initiate code loading for client components. However we only start fetching these chunks after hydration has begun which is necessarily after the initial chunks for the entrypoint have loaded.
React has upstream changes that need to land which will preinitialize the rendered chunks for all client components used during the SSR pass. This will cause a `<script async="" src... />` tag to be emitted in the head for each chunk we need to load during hydration which allows the browser to start fetching these resources even before the entrypoint has started to execute.
Additionally the implementation for webpack and turbopack is different enough that there will be a new `react-server-dom-turbopack` package in the React repo which should be used when using Turbopack with Next.
This PR also removes a number of patches to React src that proxy loading (`__next_chunk_load__`) and bundler requires (`__next_require__`) through the `globalThis` object. Now the react packages can be fully responsible for implementing chunk loading and all Next needs to do is supply the necessary information such as chunk prefix and crossOrigin attributes necessary for this loading. This information is produced as part of the client-manifest by either a Webpack plugin or Turbopack.
Additionally any modifications to the chunk filename that were previously done at runtime need to be made in the manifest itself now. This means we need to encode the deployment id for skew protection and encode the filename to make it match our static path matching (and resolutions on s3) when using `[` and `]` segment characters.
There are a few followup items to consider in later PRs
1. we currently bundle a node and edge version of react-server-dom-webpack/client. The node version has an implementation for busboy whereas the edge version does not. Next is currently configured to use busboy when handling a fetch action sent as multipart with a node runtime. Ideally we'd only bundle the one platform we are buliding for but some additional refactoring to support better forking is possibly required here
This PR also updates react from 09285d5a7 to d900fadbf.
### React upstream changes
- https://github.com/facebook/react/pull/27439
- https://github.com/facebook/react/pull/26763
- https://github.com/facebook/react/pull/27434
- https://github.com/facebook/react/pull/27433
- https://github.com/facebook/react/pull/27424
- https://github.com/facebook/react/pull/27428
- https://github.com/facebook/react/pull/27427
- https://github.com/facebook/react/pull/27315
- https://github.com/facebook/react/pull/27314
- https://github.com/facebook/react/pull/27400
- https://github.com/facebook/react/pull/27421
- https://github.com/facebook/react/pull/27419
- https://github.com/facebook/react/pull/27418
Reland #54403
Also modifies the implementation of #55950 to not change the prefetch behavior when there is flight router state - we should only check the entire loader tree in the static prefetch case, otherwise we're inadvertently rendering the component tree for prefetches that match the current flight router state segment. ([slack x-ref](https://vercel.slack.com/archives/C03S8ED1DKM/p1695862974745849))
This includes a few other misc fixes for static prefetch generation:
- `next start` was not serving them (which also meant tests weren't catching a few small bugs)
- the router cache key casing can differ between build and runtime, resulting in a bad cache lookup which results suspending indefinitely during navigation
- We cannot generate static prefetches for pages that opt into `searchParams`, as the prefetch response won't have the right cache key in the RSC payload
- Layouts that use headers/cookies shouldn't use a static prefetch because it can result in unexpected behavior (ie, being redirected to a login page, if the prefetch contains redirect logic for unauthed users)
Closes NEXT-1665
Closes NEXT-1643
This ensures we properly set the `isReady` flag when building with `experimental-compile` and enables our main app dir test suite to ensure we don't regress on it.
Investigating problems this is causing where incorrect flight data is being generated (potentially not correctly bailing on non-static data) causing navigation issues.
Reverts #54403
in #54059 the nonce attribute was added to preinitialized scripts to when using this CSP directive. The test added asserts there is at least one script that has the nonce attribute. I've changed this to 2 because currently our builds produce at least two "main" scripts, the main chunk and the webpack runtime. The way we bootstrap there is always exactly one bootstrap script which means if we only assert that there is one script with a nonce we might not be asserting anything about the preinit script path. If we ever update our webpack config to produce a single main script this test will fail but we should never do that (it's bad for caching) and so it shouldn't happen and if it does it will hopefully force us to consider if we're making a mistake
Additionally I've added another test that is more e2e. it asserts that the page bootstraps even when using CSP (in prod). In Dev it asserts the CSP attributes but it expects the bootstrap to fail because our dev mode violates the CSP directive with eval.
Fixes#54055.
A bug recently introduced in https://github.com/vercel/next.js/pull/53705 made it so that we were now preinitializing some of our scripts slightly better, but in doing so, we failed to pass in a nonce. This broke nonce-based CSP usage. The fix was to add the `nonce` to our `ReactDOM.preinit` calls.
Manual testing shows that this change fixes the error and the nonce is now passed in as expected.
Co-authored-by: Dan Ott <360261+danieltott@users.noreply.github.com>
### What?
This PR makes it easier to use Next.js with IPv6 hostnames such as `::1` and `::`.
### How?
It does so by removing rewrites from `localhost` to `127.0.0.1` introduced in #52492. It also fixes the issue where Next.js tries to fetch something like `http://::1:3000` when `--hostname` is `::1` as it is not a valid URL (browsers' `URL` class throws an error when constructed with such hosts). It also fixes `NextURL` so that it doesn't accept `http://::1:3000` but refuse `http://[::1]:3000`. It also changes `next/src/server/lib/setup-server-worker.ts` so that it uses the server's `address` method to retrieve the host instead of our provided `opts.hostname`, ensuring that no matter what `opts.hostname` is we will always get the correct one.
### Note
I've verified that `next dev`, `next start` and `node .next/standalone/server.js` work with IPv6 hostnames (such as `::` and `::1`), IPv4 hostnames (such as `127.0.0.1`, `0.0.0.0`) and `localhost` - and with any of these hostnames fetching to `localhost` also works. Server Actions and middleware have no problems as well.
This also removes `.next/standalone/server.js`'s logging as we now use `start-server`'s logging to avoid duplicates. `start-server`'s logging has also been updated to report the actual hostname.
The above pictures also demonstrate using Server Actions with Next.js after this PR.
Fixes#53171Fixes#49578
Closes NEXT-1510
Co-authored-by: Tim Neutkens <6324199+timneutkens@users.noreply.github.com>
Co-authored-by: Zack Tanner <1939140+ztanner@users.noreply.github.com>
Currently all scripts that are required for every page are loaded as
part of the bootstrap scripts API in React. Unfortunately this loads
them all as sync scripts and thus requires preloading which increases
their priority higher than they might otherwise be causing things like
images to load later than desired, blocking paint. We can improve this
by only using one script for bootstrapping and having the rest
pre-initialized. This only works because all of these scripts are
webpack runtime or chunks and can be loaded in any order asynchronously.
With this change we should see improvements in LCP and other metrics as
preloads for images are favored over loading scripts
Co-authored-by: Steven <steven@ceriously.com>
### Why
We calculate the “next url” depending on the router state and the previous router state so that when you navigate to a route, the proxy matches with that header and returns you the intercepted route if matching
### What
- Fixes#52745
Co-authored-by: Jiachi Liu <4800338+huozhi@users.noreply.github.com>
We show the "Application error: a client-side exception has occurred (see the browser console for more information)" error incorrectly when a server-side error occurs (a digest is present) when we should be showing an error saying it is in fact a server side error and should check the logs there. This change will make the error message more accurate for users to look up
Fixes NEXT-1263
### What?
Fixes https://github.com/vercel/next.js/issues/50129
### Why?
The current denormalization of app dir paths doesnt account for the
normalization done in `normalizeAppPath`, causing build log outputs for
certain paths such as anything under a route groups to be incorrect
### How?
There's 2 ways this could be fixed:
1.) Denormalize the app dir paths by reading the
`app-path-routes-manifest.json` and mapping back to the original file
path
2.) (what I chose to do) Normalize the keys of `appBuildManifest`
### Result
App dir paths, including route groups, now have their correct output
size
<img width="494" alt="image"
src="https://github.com/vercel/next.js/assets/93682696/0eee79b8-7d60-4c88-b07a-dfb750aa9592">
---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
