Dunqing
b60f8a7c14
monitor-oxc's Test262 job fails on every run because `cargo coverage
runtime` no longer matches `runtime.snap`. The runtime suite skips the
cases V8's `test262.status` lists as failing, and it fetches that file
from V8's `main` branch at run time. On 2026-10-09 V8 landed
`03af3c3548` ("[scopes] Reject var arguments in parameter eval") and
removed the 88 `language/eval-code/direct/*declare-arguments*` entries.
Node 26.5 bundles V8 14.6.202, which predates that fix, so those 88
cases now run and fail with `Expected a SyntaxError to be thrown`.
The skip list exists to hide bugs of the engine that executes the cases,
and that engine is Node's V8, not V8 `main`. `main` is wrong in both
directions: it un-skips cases V8 fixed after Node's branch cut, and it
skips 236 entries for test262 files newer than the pinned checkout.
The list is now fetched at the V8 version reported by `node -p
process.versions.v8` (`14.6.202.34`, which V8 tags on GitHub), falling
back to `main` only when that tag does not exist. The gitignored cache
file carries the version in its name so a Node bump cannot serve a stale
list.
With the pinned list the snapshot only changes when the test262 pin or
`.node-version` moves. Regenerated against Node 26.5.0 it adds nothing
and drops: four `delete/super-property-uninitialized-this` cases that V8
fixed upstream after 14.6, the `typeof/symbol.js` timeout, and the two
`bigint-and-number-extremes` minify cases that #27656 fixed (the regular
CI does not run the runtime suite, so that PR could not update the
snapshot):
| skip list | cases | passed | new failures |
| --- | --- | --- | --- |
| V8 `main` today | 18369 | 17307 | 88 |
| V8 `14.6.202.34` | 18277 | 17306 | 0 |
Written with Claude Code; reviewed and tested by me.
⚓ Oxc
/oʊ ɛks siː/
The Oxidation Compiler is a collection of high-performance tools for JavaScript and TypeScript written in Rust.
Oxc is part of VoidZero's vision for a unified, high-performance toolchain for JavaScript. It powers Rolldown (Vite's bundler) and enables the next generation of ultra-fast development tools that work seamlessly together.
For more information, check out our website at oxc.rs.
* Oxidation is the chemical process that creates rust
🙋 Who's using Oxc?
Rolldown and Nuxt use Oxc for parsing. Rolldown also uses Oxc for transformation and minification. Nova, swc-node, and knip use oxc_resolver for module resolution. Preact, Shopify, ByteDance, and Shopee use oxlint for linting.
🔧 Lint or Format a Codebase
🧰 Build Tooling on Top of Oxc
- Parse JavaScript and TypeScript: Parser
- Transform TypeScript, JSX, and modern JavaScript: Transformer
- Minify JavaScript for production builds: Minifier
- Resolve modules for JavaScript and TypeScript: Resolver
✍️ Contribute
Check out some of the good first issues or ask us on Discord.
See CONTRIBUTING.md for guidance, or read the complete contributing guide on our website →
If you are unable to contribute by code, you can still participate by:
- Add a GitHub Star to the project
- Join us on Discord
- Follow me on X and post about this project
📚 Other Resources
Sponsored By
📖 License
Oxc is free and open-source software licensed under the MIT License.
Thank you to namespace.so for powering our CI/CD pipelines with fast, free macOS and Linux runners.
Oxc ports or copies code from other open source projects, their licenses are listed in Third-party library licenses.