Rolldown

Today, VoidZero joins Cloudflare. Vite remains MIT, vendor-neutral, and stewarded by the same wider team. The same goes for Vitest, Rolldown, and Oxc. Cloudflare is also committing $1M to an OSS fund to support independent development in the Vite ecosystem.

VoidZero is joining Cloudflare. Our mission stays the same: to make JavaScript developers more productive than ever before. Vite, Vitest, Rolldown, Oxc, and Vite+ remain MIT-licensed. Evan and the VoidZero team will continue leading them.

Rolldown v1.0.0-rc.16 is out 🎉 - Support cross-module const enum inlining - Fix empty module namespace in `manualChunks` - Fix wildcard re-exports with transitive top-level await - More bug fixes and improvements github.com/rolldown/rol...

SvelteKit 2 now fully supports Vite 8 SvelteKit 3 will require it - giving additional optimizations and functionality. E.g. SvelteKit 3 will use @rolldown.rs hook filters to spend more compilation time in rust and less in JavaScript. And SvelteKit 3 adapters use only rolldown without esbuild

Rolldown can panic sometimes... but we make sure you never have to! It's rare, but when it happens, you won't be staring at a cryptic stack trace. @rolldown.rs straight up tells you it is not your code. And a link to report it so we can fix it fast. Good error messages => good DX

✨ What's New in ViteLand: January 2026 Recap ◆ Unified redesign across all VoidZero sites ◆ @vite.dev crossed 3 billion npm downloads ◆ @rolldown.rs reached RC status ◆ Lazy Barrel Optimization landed in Rolldown ◆ Oxfmt hit 100% Prettier conformance ◆ ...and more 👀 voidzero.dev/posts/whats-...

The State of JS 2025 results are out! 🏆 Most Adopted Tech → Vitest 🏆 Highest Satisfaction → Vite (98%) & Vitest (97%) 🏆 Highest Interest → Vitest (83%) & Rolldown (80%) But that's not all! A thread 🧵

🚀 Lazy Barrel Optimization in Rolldown Barrel files, files that re-export from other modules, are common in modern JavaScript projects but a nightmare for your build time. Rolldown now has Lazy Barrel Optimization to fix this. Here's how it works 🧵

🔍 @rolldown.rs can now automatically discover your tsconfig, similar to how @vite.dev does it, respecting `references`. The feature was available beforehand but is now enabled by default! Don't want auto discovery? Then provide a path to another config More in the docs rolldown.rs/reference/In...

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In the next version of Rolldown, you can automatically clean up the previous build when rebuilding by setting `output.cleanDir` to true 🧹 Thanks to @aprosail for the contribution! github.com/rolldown/rol...

Watch VoidZero's @thealexlichter.com spill the tea about @rolldown.rs and bundlers. Why bundlers are needed and how come @vite.dev is migrating to Rolldown in Vite 8. Full video in comment 👇

In the next version of Rolldown, bundling will be ~10% faster 🎉 This was achieved by optimizing the semantic scoping process Internal plugins like define and inject now flag when they haven't changed the AST, allowing to skip redundant scope recreation github.com/rolldown/rol...

Building performant tools doesn't happen by accident. They need a strong foundation! @rolldown.rs and @vite.dev 8 are powered by Oxc for that reason We've evaluated all previous PRs that went into the Oxidation compiler, 290 of them improving performance This is what foundational work looks like!

Said no one ever 👀

Another beta - another bunch of improvements 🔥 Also includes changes from the latest Oxc version!

Faster on Windows ✔

Rolldown drops CJS support! From the latest version of @rolldown.rs (1.0.0-beta.36) on, Rolldown will only be released in the ESM format. The required Node version has also been bumped to align with @vite.dev (20.19+ and 22.12+). Node 18 has been dropped due to being EOL since April.

tsup is not actively maintained anymore 👀 With >9M NPM monthly downloads and >10k GitHub stars, tsup is undeniably a popular choice for bundling. Unfortunately, it is not under active maintenance anymore. Thanks to @egoist.dev & contributors for all the work on tsup 🙏🏻

In the latest @rolldown.rs powered @vite.dev version, we've enabled the rust-based resolver plugin by default! This will lead to even faster builds in case you don't use the experimental native plugins yet. Wanna try out more native core plugins? Then enable them and make sure to use rolldown-vite

`oxlint --type-aware`. Mic drop. It's incomplete and have numerous problems, including a noticeable performance issue. BUT, you can finally see your floating promises quickly! Example PR: github.com/rolldown/rol... Problems: t.co/K7ZVnPjOPL

Remember how @gitlab.com got 2.6x faster builds and ~100x less memory consumption when using @rolldown.rs? Now, with all the native plugins enabled, they are down to 22s. That is ~7x faster than Vite, ~half the time compared to using native resolver before and 43x faster than their webpack build 🔥

What's new in ViteLand? Our July 2025 recap is out. 🎉 Announcing 1st in-person @viteconf.org in Amsterdam 📈 @vite.dev surpassing webpack's downloads ⏩ Major performance boosts for @rolldown.rs 🔥 Type-aware linting & custom rules for Oxlint 👀 and more Read the post: voidzero.dev/posts/whats-...

Did you know that @rolldown.rs supports converting your top-level variables to var? It seems weird at first, but is actually helpful - and your output is still ESM and modern code! The transform can improve perf due to avoiding "temporal dead zone" checks of VMs that can cause slowdowns up to 1000%

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Wow! @sapphi.red just made @rolldown.rs Vite's startup time 2x quicker. How? By dealing with PIFEs and optimizing for the v8 engine, also coming to Oxc 👀 Everyone knows IIFEs but PIFEs? 😁 Really impressed by such deep knowledge 👏

✨ Node.js: Now with Rolldown? Yes - to some degree! @rolldown.rs is planned to power the future API documentation generator of @nodejs.org. More info in the linked PR! github.com/nodejs/api-d...

🚨 Speaker Alert 🚨 We're incredibly proud to bring together an exceptional group of speakers who are pushing the boundaries of web development with @vite.dev Over the next few days, we'll be highlighting the incredible speakers who will be on our stage on Oct 9-10! Stay tuned 🚀 viteconf.amsterdam

Did you know that Rolldown-Vite supports tsconfig path resolution out of the box? Use the path resolutions defined in your tsconfig by setting `resolve.tsconfigPaths`. The only requirement? You must use native plugins, either only the resolver or all No extra plugin needed 🙌

The new v0.24 of vite-plugin-node-polyfills now uses more of @rolldown.rs's built-in features, e.g. inject, which improves performance when detecting it is running via the Rolldown-powered @vite.dev! 🙌 More in the PR from @sapphi.red

The @rolldown.rs powered @vite.js version is out for a while, giving 2~16x build speed improvements! If you ever wondered how to switch, then no worries. I show you how in less than 90 seconds! Also, one more goodie for React users (switching to the Oxc-based Vite plugin)

Rolldown won the "Breakthrough of the Year" award at the @jsnation.gitnation.org OSS awards. Thank you to all who voted for the project 🙏🏻 And no worries - more improvements and updates are continuously coming 🔥

SvelteKit now supports Rolldown for faster builds via Rust! See the changelog for more details: github.com/sveltejs/kit... Thanks to Tee Ming and @dominikg.dev for implementing and the @rolldown.rs team for a tremendous amount of support in making this work!

when i think about rolldown.rs and how it advertises a 'Rollup-compatible API' i think about the space shuttle and roman horses' butts astrodigital.org/space/stshor.... happy i got to build the chariot all those years ago

Wonder what @rolldown.rs is exactly? Here is the 37-second explainer you didn't know you needed (Sound on 🔊)!

For the Oxlint 1.0 announcement, I'd like to show more real world performance numbers on large repos. If Oxlint has been satisfactory, would you be keen to send me the numbers Oxlint reports at the end? If you have never tried Oxlint but has a large repo: `npx oxlint@latest`.

What is tsdown? -🤘Library author? Click! 😁 @voidzero.dev www.youtube.com/watch?v=FF1o...

This is exciting! Time to try out Rolldown-Vite and share your feedback with us, while also gaining 3~16x production build time reductions. If you have any questions around it, please let me know! And as usual, more improvements are in the pipeline 🙌🏻

Today we are excited to announce Rolldown-Vite: a technical preview of the version of @vite.dev entirely powered by the Rust stack we built over the past year (Oxc + @rolldown.rs) voidzero.dev/posts/announ...

Happy to see Mercedes Benz adopting modern tooling such as @rolldown.rs and Oxc in their workflow, as well as going the extra mile and sharing their results! Up to 64% CI pipeline time reduction is impressive 👀 And more per improvements are yet to come 🤯 www.mercedes-benz.io/blog/2025-05...

ICYMI: GitLab saw their memory consumption reduced by 100x by using the @rolldown.rs powered @vite.dev version (in addition to a 2.6x speedup) 🤯

I had a blast talking with @tej.as about what @voidzero.dev is, what comes next for @rolldown.rs, Oxc and all tooling around the @vite.dev ecosystem and how they'll benefit you as a developer!

I've been so surprised! Just only by tweaking the npm alias in my day-job project, We were able to build with rolldown-vite. I didn't touch vite.config at all. 🚀 Build performance has been between 4.4x and 8x faster than the existing vite version!

🚀 Bundler Explorer is here (preview)! Quickly create minimal demos for @rolldown.rs, Rollup, esbuild, and (coming soon) @rspack.dev! Perfect for testing, debugging, or just exploring bundler behavior. 👉 Try it now bundler.sxzz.dev

Rolldown's perf never fails to impress 👀 After further improvements, @excalidraw.com now builds 16x faster! From 22.9s down to **1.4s** 🤯 2355 modules - bundling, minifying and emitting source maps. Check out the forked version @sapphi.red trimmed down if you are curious.

The tsdown documentation site is now live! Check it out here: tsdown.dev

Big news! tsdown has officially been adopted by @rolldown.rs as part of their core ecosystem and will become the foundation for Rolldown Vite’s Lib Mode! 🎉 Excited to see it evolve as part of the official ecosystem. Stay tuned for more updates! github.com/rolldown/tsd...

When Remix adopted Vite, there were 2 notable drawbacks: 1. Dev vs. prod differences with bundling 2. Dev only supported Node as first-class runtime @rolldown.rs will solve (1), and now @vite.dev 's Env API has solved (2)! blog.cloudflare.com/introducing-...

We are planning to port this to Rust as well in the future. Meaning you'll be able to build both your JS bundle and bundled dts files in one go with @rolldown.rs when you use isolated declarations!