### What
This PR exposes new experimental configuration for next.js,
`experimental.reactCompiler`. Under the hood, this option configures to
use new experimental react compiler
(https://react.dev/learn/react-compiler#). `reactCompiler` value can be
either boolean or an object contains partial set of compiler itself's
configuration option.
For the webpack and turbopack both it is enabled by adding a babel
plugin for the react compiler. If user have an existing .babelrc, plugin
will be appended to the config. Otherwise, swc will still kicks in (for
webpack) or turbopack for the general transform but only compiler babel
plugin will run via babel.
---------
Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
Bumped acorn to latest version to let it parse class properties.
Class properties and private properties support was landed in 8.6.0,
bumping acorn parser to latest version then we can parse all the
syntaxes.
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Hi everyone, this is my first PR to such a large project so please be
gentle. 😄 I'm also new to publishing packages so I'm not sure if I'm
missing any steps.
ESLint 9.0.0 came out a few days ago and unfortunately,
`eslint-plugin-next` is not compatible as it uses deprecated (and with
ESLint 9.0.0 removed) functions.
In this PR, I replaced the deprecated functions with the suggested
replacements ([check this
out](https://eslint.org/blog/2023/09/preparing-custom-rules-eslint-v9/)).
Regarding backwards compatibility, everything I used is available since
ESLint 8.40 (released May 2023). I'm not sure how far back Next.js
support goes but it feels fine to me.
I successfully tested some rules locally with ESLint 9.0.0 and this
`eslint.config.js` (flat config format):
```js
import js from '@eslint/js';
import nextPlugin from '@next/eslint-plugin-next';
import prettierRecommended from 'eslint-plugin-prettier/recommended';
import importSortPlugin from 'eslint-plugin-simple-import-sort';
import globals from 'globals';
import tseslint from 'typescript-eslint';
/**
* TypeScript config with strict type checking and no type checking for JS files.
*/
const typeScriptConfig = [
...tseslint.configs.strictTypeChecked,
{
plugins: {
'@typescript-eslint': tseslint.plugin,
},
languageOptions: {
parser: tseslint.parser,
parserOptions: {
project: true,
},
},
},
{
// disable type-aware linting on JS files
files: ['**/*.js', '**/*.mjs', '**/*.cjs'],
...tseslint.configs.disableTypeChecked,
},
];
/**
* Next.js config with recommended and core web vitals rules.
*/
const nextConfig = {
plugins: {
'@next/next': nextPlugin,
},
rules: {
...nextPlugin.configs.recommended.rules,
...nextPlugin.configs['core-web-vitals'].rules,
},
};
/**
* Import sort config with simple-import-sort plugin.
*/
const importSortConfig = {
plugins: {
'simple-import-sort': importSortPlugin,
},
rules: {
'simple-import-sort/imports': 'error',
'simple-import-sort/exports': 'error',
},
};
/**
* The final ESLint config wrapped with the tseslint.config helper for type hinting.
*/
export default tseslint.config(
{
ignores: ['.next', '.yarn', '**/*.d.ts', 'node_modules'],
},
{
languageOptions: {
globals: {
...globals.browser,
...globals.node,
},
},
},
js.configs.recommended,
...typeScriptConfig,
nextConfig,
prettierRecommended,
importSortConfig,
);
```
It has a few more configs but I'm sure you can remove most of them. The
important one is the `nextConfig`. Also important: Run `eslint` and not
`next lint`, it's currently not compatible with the new flat config
format.
Related discussion: https://github.com/vercel/next.js/discussions/54238
---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
## What?
Implements support for running the Turbopack trace server, which is the
websocket server that powers https://turbo-trace-viewer.vercel.app/ when
using `NEXT_TURBOPACK_TRACING=1 NEXT_TURBOPACK_TRACE_SERVER=1`.
Currently you have to manually run the server through the Turbo
repository which in practice means that only people working on Turbopack
are able to run it.
With the bindings implemented anyone should be able to run the trace
server.
Note that the traces that come out of Turbopack are very low level,
they're meant for optimizing Turbopack like finding slowdowns / large
memory usage / optimizing performance.
However, it's useful for people that want to peek into why their
application is slow to compile. I.e. we've used
https://turbo-trace-viewer.vercel.app to investigate reports in #48748.
This PR adds support for `trace.log` by default, so if you add
`NEXT_TURBOPACK_TRACING=1 NEXT_TURBOPACK_TRACE_SERVER=1` it will
automatically select the `trace.log` for the current instance of
Next.js. You can only have one trace server running at the same time.
### `next internal`
In order to support running the trace server standalone, which is useful
for investigating trace files other people have shared, I've added a new
subcommand `internal` that is not covered by semver / use at your own
risk. It's meant for internal tools that are useful to be bound to the
version of Next.js, the turbo-trace-server is a great example of that as
it has an internal binary format for storing data that needs to match
the trace.log file.
If you want to take a look at `.next/trace` instead the new `next
internal` subcommand can be used for that:
```sh
# Replace [path] with a path to a file.
next internal turbo-trace-server [path]
```
For example:
```sh
next internal turbo-trace-server ~/Downloads/trace
```
Currently the trace server does not support loading multiple files, just
hasn't been implemented yet. Once we can load two or more files we can
load both `.next/trace` and `trace.log` when
`NEXT_TURBOPACK_TRACE_SERVER=1` and support multiple paths passed to
`next internal turbo-trace-server`.
### Turbopack upgrade
PR includes a Turbopack upgrade:
* https://github.com/vercel/turbo/pull/8073 <!-- OJ Kwon -
feat(webpack-loaders): support dummy span interface -->
* https://github.com/vercel/turbo/pull/8083 <!-- OJ Kwon - fix(webpack):
print resource, project path when relative calc fails -->
* https://github.com/vercel/turbo/pull/8094 <!-- Tim Neutkens -
Implement bindings for Turbopack trace server -->
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### Why?
### How?
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Fixes #
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Closes NEXT-3328
