## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
## Documentation / Examples
- [ ] Make sure the linting passes
This expands on https://github.com/vercel/next.js/issues/24070 and ensures we show the dev overlay for additional cases like where `_app` or `_document` have syntax errors causing compilation to not be able to complete. This achieves showing the dev overlay even when compilation fails from a syntax error by doing a third minimal compilation in development with the needed client-side assets to render the dev overlay.
## Bug
- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
x-ref: https://github.com/vercel/next.js/issues/24070
* import next-server logic during the time the configuration is loaded
* load minimizer plugins only when used
* load ReactDevOverlay only when used
* load only meta information of tsconfig for validation
* make worker for configuration loading lighter
* only load runTypeCheck when used
* load postcss config only when used
This adds support for returning an object from `rewrites` in `next.config.js` with `beforeFiles`, `afterFiles`, and `fallback` to allow specifying rewrites at different stages of routing. The existing support for returning an array for rewrites is still supported and behaves the same way. The documentation has been updated to include information on these new stages that can be rewritten and removes the outdated note of rewrites not being able to override pages.
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [x] Integration tests added
- [x] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
## Documentation / Examples
- [ ] Make sure the linting passes
This PR upgrades `jest-worker` and `jest-cli` to the latest pre-release version, also removed `jest-circus` which is included in Jest by default. `jest-worker@next` includes a fix for memory leak that we need (https://github.com/facebook/jest/pull/11187).
Fixes#22925. This will also improve the OOM issue for `next dev` #15855.
A number of changes here. I recommend viewing the diff with the <a href="?w=1">whitespace flag enabled</a>.
- OpenTelemetry is replaced with a custom and lightweight tracing solution.
- Three trace targets are currently supported: console, Zipkin, and NextJS.
- Tracing is now governed by environment variables rather than `--require instrument.js`.
+ `TRACE_TARGET`: one of `CONSOLE`, `ZIPKIN`, or `TELEMETRY`; defaults to `TELEMETRY` if unset or invalid.
+ `TRACE_ID`: an 8-byte hex-encoded value used as the Zipkin trace ID; if not provided, this value will be randomly generated and passed down to subprocesses.
Other sundry:
- I'm missing something, probably a setup step, with the Zipkin target. Traces are captured successfully, but you have to manually enter the Trace ID in order to view the trace - it doesn't show up in queries.
- I'm generally unhappy with [this commit](235cedcb3e). It is... untidy to provide a telemetry object via `setGlobal`, but I don't have a ready alternative. Is `distDir` strictly required when creating a new Telemetry object? I didn't dig too deep here.
As noted, there are a lot of changes, so it'd be great if a reviewer could:
- [ ] pull down the branch and try to break it
- [ ] check the Zipkin traces and identify possible regressions in the functionality
Closes#22570Fixes#22574
This updates to output server chunks to a nested folder to prevent bundling the entire folder when tracing. This also fixes the webpack 5 tests not actually using webpack 5 since https://github.com/vercel/next.js/pull/22583 since the webpack 5 enabling check didn't account for the test environment variable used to enable webpack 5. This also clears up some deprecation warnings from webpack 5 in the mini-css-extract-plugin.
Fixes: https://github.com/vercel/next.js/issues/21297
@timneutkens I think this is ready for a review.
I've made some changes to the original design that _seem_ to have paid off. The parenting relationships for traces of normal builds are applied more uniformly, resulting in more intelligible traces:
<img width="900" alt="Screen Shot 2021-01-29 at 12 53 47 AM" src="https://user-images.githubusercontent.com/5016978/106253732-ba321880-61cc-11eb-98fd-d45af5078273.png">
Hot-reloading is surfaced now, too. I will note, however, that we will want to dig in deeper and find out where the large portion of time at the beginning of hot-reload is spent. Example:
<img width="894" alt="Screen Shot 2021-01-29 at 12 53 28 AM" src="https://user-images.githubusercontent.com/5016978/106253828-e057b880-61cc-11eb-967d-46eaff31ecef.png">
Where did those 180 ms go? At the least, we can now track how long a hot-reload takes, and have a place to start with further investigation.
This picks up on the inlining work in https://github.com/vercel/next.js/pull/20598 to also include webpack loader inlining optimizations.
This includes:
* The dependencies of sass-loader
* resolve-url-loader
And for added benefit:
* babel-plugin-transform-define
* babel-plugin-transform-react-remove-prop-types
style-loader and css-loader didn't inline easily. Perhaps we can come back to these ones.
There's currently two bugs with the font optimization, but we'd really like to ship a stable version.
To unblock the stable release, we're **temporarily** reflagging this. It'll be unflagged on canary again!
Solves the following warning:
> (node:1484) [DEP_WEBPACK_MAIN_TEMPLATE_REQUIRE_FN] DeprecationWarning: MainTemplate.requireFn is deprecated (use "__webpack_require__")
This PR removes the modern mode experiment because:
- It does not yield meaningful bundle size wins when compared to other initiatives we've taken
- It's not compatible with webpack 5 (which we're upgrading to)
- It's currently broken and causes most apps to malfunction
- There's no champion currently owning the experiment
We can re-introduce this in the future when we'd like to make it a default for all Next.js apps.
Note: **Next.js still supports Differential Loading (`nomodule`) and does it by default.** This PR strictly removes the experimental modern _syntax_, and does not disable our existing modern/legacy polyfilling.
---
Fixes#19200Fixes#18960Fixes#14707Fixes#14465
We accidentally regressed back in 9.5 and dropped support for inline CSS comments. PostCSS always parses these as pass-through (and not a syntax error), which can cause problems when minifying.
Browsers do a similar thing and ignore the comments.
To ensure we generate valid CSS, this adds support for stripping the CSS comments from the build.
---
Fixes#15589Closes#17130
This upgrades to ncc@0.25.0 and fixes the previous bugs including:
* ncc not referenced correctly in build
* Babel type errors
* node-fetch, etag, chalk and raw-body dependencies not building with ncc - these have been "un-ncc'd" for now. As they are relatively small dependencies, this doesn't seem too much of an issue and we can follow up in the tracking ncc issue at https://github.com/vercel/ncc/issues/612.
* `yarn dev` issues
Took a lot of bisecting, but the overall diff isn't too bad here in the end.
This adds inlining for Babel and the Babel plugins used in next.
This is based to the PR at https://github.com/vercel/next.js/pull/18823.
The approach is to make one large bundle and then separate out the individual packages from that in order to avoid duplications.
In the first attempt the Babel bundle size was 10MB... using "resolutions" in the Yarn workspace to reduce the duplicated packages this was brought down to a 2.8MB bundle for Babel and all the used plugins which is exactly the expected file size here.
This will thus add a 2.8MB download size to the next package, but save downloading any babel dependencies separately, removing a large number of package dependencies from the overall install.
This is a prerequisite to being able to ncc inline the Babel dependencies in next.js.
The removal of preset-modules is based on replacing it with preset-env under `targets: { esmodules: true }`, as per the guidance from the package (https://www.npmjs.com/package/@babel/preset-modules):
> Starting from @babel/preset-env 7.9.0, you can enable the bugfixes: true option to get the same behavior as using @babel/preset-modules, but with support for custom targets. If you need to target browsers with native modules support (like this preset does), you can use targets: { esmodules: true }.
From the above, I'm pretty sure this is entirely a backwards compatible change, apart from the change to the runtime plugin list being visible. Perhaps @developit can confirm this as well.
To prevent FOUC, discussed in #10557 i need to store information about css file dependencies for chunk. Right now current implementation just throws away everything but js.
Can there be more than one css file in chunk? If no - code will be simplified.
closes#10557
