Rspack

Rstack is a lightning-fast JavaScript toolchain that includes Rspack, Rsbuild, Rslib, Rspress, Rsdoctor, Rstest and Rslint.

[Rspack @rspack_dev]

🦀 Rsdoctor 2.0 is here!

⚡ 40–60% faster analysis
📦 56% smaller install size
🤖 Agent-driven build analysis
🧩 One report for multi-compiler builds

Explore what’s new 👇
https://t.co/gLEVvAXfVl

[Dennis Cual @denCual]

After migration to @rspack_dev Rsbuild, then try Rstest as a replacement for Jest. This reuse your Rsbuild config making your test runner behavior closer to your build and has single source. You can delegate the task to the agent. Meaning the annoying works when doing migration like replacing jest references to rs, changing the mocks, rewriting snapshots, etc majority of these will be handled by your agent. Just make sure you install Rstest skills and the agent is doing loop.

Our average shard with jest in CI is around 11mins. Down to 2 mins with rstest. Its just fast!

[Jiahan Chen @jiahan_c]

Fun fact:

ChatGPT’s web app uses Rsbuild rather than using Rspack directly 👀

[Zack Jackson @ScriptedAlchemy]

Please don’t use rspack, use rsbuild.
Only ever use rspack directly if you are porting off webpack.

[Jiahan Chen @jiahan_c]

Some real-world gains from migrating to Rspack 👇

[James @James_Elicx]

rsbuild-plugin-cloudflare v0.0.1

An experimental prototype that lets you run an rsbuild dev server inside workerd, and build apps that can be deployed with the cf cli. Built on the Vite plugin's internals

Try it out with your TanStack Start apps today

https://t.co/IcVgc46gaD

[Jiahan Chen @jiahan_c]

Excited to see a Cloudflare plugin for Rsbuild! Give it a try with TanStack Start and share your feedback

[Jiahan Chen @jiahan_c]

In the next release, Rspack will support `codeFilter` for loaders ⚡

Run a loader only on modules containing specific code, such as a "use foo" directive.

Skip unnecessary transforms and speed up your builds

[Néstor @nstlopez]

We moved the Zephyr Cloud dashboard (1 host + 7 Module Federation remotes) from Rspack to Rsbuild 2 by @rspack_dev, then let Rsdoctor 2 drive the cleanup.

First load: 1,045 → 729 KB gzip (−30%)
Build: 112s → 90s (−20%)
15-route journey: 1,294 → 788 KB (−39%)

Numbers 🧵

[Edouard Bozon @edbzn]

In 2025, I wrote about Rspack in Angular. 2026 update:
🔹 Now @nx/angular-rspack
🔹 i18n, SSG, HMR, SSR app engine supported
🔹 Rspack 2.0 ready
🔹 8× faster than Webpack, on par with esbuild
On Webpack with Module Federation? Look at it. On esbuild? Stay.
https://t.co/XOA51ByhL8

[Jiahan Chen @jiahan_c]

You can now select TanStack Start in create-rsbuild too

[Zack Jackson @ScriptedAlchemy]

We also see an extremely high correlation in the adoption of module federation and a product teams adoption of ai. Even pre-ai, teams who adopt federation average 3x increase in product output.

[Jiahan Chen @jiahan_c]

Rspack now powers massive codebases at some of the world’s largest companies, and feedback from these teams keeps making it better.

Engineers at Microsoft and OpenAI have contributed over 100 PRs and issues. Thank you for all the contributions!

[Oskar Lebuda @OskarLebuda]

@jiahan_c Since then, our app has grown significantly, but with every new Rspack release, our build times have gone down.

Every release brought performance improvements, and now our production build takes just ~40 seconds.

We save a lot of time thanks to it!

[Jiahan Chen @jiahan_c]

Rspack 1.0 is only two years old, but these numbers make it feel a generation behind 🫢

I hope we’ll say the same about 2.x when 3.0 ships

[Jiahan Chen @jiahan_c]

Rspack 1.0 is only two years old, but these numbers make it feel a generation behind 🫢

I hope we’ll say the same about 2.x when 3.0 ships

[Jiahan Chen @jiahan_c]

Congrats to the TanStack Start team on 1.0! 🎉

TanStack Start has the best Rsbuild support among full-stack frameworks. Looking forward to making it even better together.

[Jiahan Chen @jiahan_c]

Looks like Bun uses its own Rust type checker for type-aware linting.

We built Rslint on typescript-go for fewer type-checking surprises. That’s why Rslint is mostly written in Go.

I wish TypeScript native were written in Rust. It’d make the tooling ecosystem more unified

[Rspack @rspack_dev]

Child chunks can now reuse more modules already available from their parents, while preserving loading behavior.

👇PR details
https://t.co/fcFSvNO3vh

[Rspack @rspack_dev]

Less duplicate code. Smaller bundles. 📦

We've improved Rspack's chunking algorithm to reduce duplicate modules across chunks.

In a large production project, this change resulted in:
• -2.53% less raw JS size
• -1.51% fewer chunks