Rspack

A new RFC for Rspack's barrel file optimization 👀
github.com/web-infra-de...

Spent the day migrating all Rsbuild npm packages to npm's new trusted publishing feature. Simple setup, no more long-lived tokens needed. Love it! 🥰

GitHub - rspack-contrib/rspack-repl: Rspack REPL Rspack REPL. Contribute to rspack-contrib/rspack-repl development by creating an account on GitHub.

The REPL is still in its early stages, but you can already try it out: repl.rspack.rs

GitHub repo: github.com/rspack-contr...

We're building an Rspack REPL powered by @rspack/browser. Try out Rspack builds in your browser and easily share results with the community.

feat: lazy make for reexport in side effects free barrel file by ahabhgk · Pull Request #11117 · web-infra-dev/rspack Summary Lazy make for reexport (export { a, b as c } from "./x", export * as d from "./x", export * from "./x") in side effects free ("sideEffects": false in...

PR: github.com/web-infra-de...

What is a barrel file: vercel.com/blog/how-we-...

Rspack v1.5 will introduce an experimental optimization that skips building unused reexports in side-effect-free barrel files.

This reduces the build time of `import { Button } from 'antd'` from 528ms to 82ms.

Release v1.4.11 · web-infra-dev/rspack What's Changed Performance Improvements ⚡ perf: parallelize analyze module graph by @LingyuCoder in #11153 perf: enhance native watcher with customizable ignore patterns by @GiveMe-A-Name in #1114...

Full changelog: github.com/web-infra-de...

Rspack v1.4.11 is out:

⚡️ 12 perf improvements
🐞 14 bug fixes

We're starting work on v1.5.0 — stay tuned 👀

One of our community partners replaced webpack with Rspack in a popular web framework in China. Here are the benefits reported by users:

- 5x faster dev, build, and HMR
- 1.1MB smaller bundles

feat(wasm): support `@rspack/browser` by CPunisher · Pull Request #10870 · web-infra-dev/rspack Summary In Rspack 1.4, we successfully compiled @rspack/binding to wasm32-wasip1-threads and enabled support for WebContainers. The goal of this PR is to remove the reliance on WebContainers by pro...

PR: github.com/web-infra-de...

@rspack/browser is cooking 🍳🧑‍🍳

Rsbuild's next release will reduce startup time by ~25ms 🥳

Release v1.4.10 · web-infra-dev/rspack Highlights 💡 ✨ 30% smaller Wasm bundle (38.9MB → 27.2MB) ⚡ 4x faster tree shaking analysis in large projects What's Changed Performance Improvements ⚡ perf: parallelize flag usage plugin by @Li...

Release note: github.com/web-infra-de...

Rspack v1.4.10 is here:

✨ 30% smaller Wasm bundle (38.9MB → 27.2MB)
⚡ 4x faster tree shaking analysis in large projects

Respect for everything the Rspack team has been doing the past year and a half. If you're interested in the Rspack/Rsbuild ecosystem, check out the Awesome Rspack repo for links to great resources courtesy of @rspack.dev.

github.com/web-infra-de...

Rspack v1.4.9 is out: 🎉

We optimized Rust dependencies and build flags, reducing install size across all platforms. More size improvements are coming soon. 🍀

In the next release, Rspack will be able to emit errors for duplicate ESM exports:

🚀 Rspack v1.4.8 is out!

We've implemented a Rust watcher to replace the original watchpack package, making HMR ~10% faster.

Combined with lazy compilation for lightning-fast dev experience ⚡

perf: memorize exclude function in webpack config by SyMind · Pull Request #81525 · vercel/next.js During JavaScript profiling, I identified repeated calls to the exclude function in the webpack configuration and implemented caching to optimize it. I tested the performance using the chakra-ui-d...

While investigating @rspack.dev performance in Next.js, SyMind found a simple opportunity to add caching that speeds up webpack >6%! github.com/vercel/next....

An awesome contribution for those still stuck on webpack.

Run comparison - swc-project/swc - CodSpeed CodSpeed integrates into dev and CI workflows to measure performance, detect regressions, and enable actionable optimizations.

Details: codspeed.io/swc-project/...

And in other cases we saw even bigger gains: 📈

🚀 SWC parser just got 12-14% faster in the past 2 weeks! Our team contributed 30+ PRs and we're just getting started 💪

We wrote a blog sharing some findings from our binary size optimization journey - exploring efficient ways to embed large string HashMaps statically in programs: github.com/orgs/web-inf...

Browserslist-rs Gets Major Refactor, Cutting Binary Size by ... Browserslist-rs now uses static data to reduce binary size by over 1MB, improving memory use and performance for Rust-based frontend tools.

🦀 Rust continues to reshape #JavaScript frontend tooling. Browserslist-rs just got a major performance optimization: internal data is now mostly static, cutting over 1MB from WASM builds and lowering memory usage.
✨ Full story → socket.dev/blog/browser... h/t @rspack.dev

Make vendor data more static by quininer · Pull Request #32 · browserslist/browserslist-rs This PR is not yet completed. Its goal is to make browserslist-rs data completely static to reduce resident memory and binary size. This is a big refactor, so I opened a draft to get early feedback...

We'll have a blog post covering this optimization soon. 🚀

You can also check out the PR to learn more:

github.com/browserslist...

Our team member contributed to browserslist-rs, making data static to reduce memory usage and binary size.

This benefits all dependent tools like Rspack, SWC, Turbopack, and LightningCSS. Rspack's binary size was reduced by 1.64MB. 🚀

Rspack Fast Rust-based web bundler

Rspack & Rsbuild 1.4 is out! 🎉

🍀 Running in the browser
⚡️ Smaller bundles
⚡️ Incremental build by default
🪚 New CssChunkingPlugin
🦀 Lots of Rstack progress

rspack.dev/blog/announc...

refactor(es/parser): Remove token contexts by bvanjoi · Pull Request #10547 · swc-project/swc Fixes #10619 Fixes #10618 Fixes #10607 Fixes #10601

Related PR: github.com/swc-project/...

Our team member just contributed a PR to SWC with 3-8% parser perf gains 🚀

SWC parser is now 30% faster than a few months ago 📈