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Claude Code uses Bun written in Rust now
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Re: Claude Code uses Bun written in Rust now
#72> For me this outputs Bun v1.4.0 (macOS arm64). The most recent release of Bun on GitHub is currently v1.3.14 from May 12th, so that v1.4.0 version number in Claude supports them shipping a preview of a not-yet-released Bun version. And so, the FOSS project "Bun" silently dies in darkness and is now something completely else. I'm glad I still had "Investigate if Bun is worth it" on my TODO list and hadn't yet gotten…
Why does changing to Rust kill the project? I don't understand the point here.
Bun is now mainly the runtime for claude code. All changes will go in to make claude code better.
It's not about making the dev experience better than node, that use-case is now secondary.
Re: Claude Code uses Bun written in Rust now
#73Earlier quoted context omitted.
Why does changing to Rust kill the project? I don't understand the point here.
> Why does changing to Rust kill the project? I don't understand the point here. I'm concerned that the complete rewrite in an entirely different language is not a sound technical decision and instead is a ploy to shed copyright claims from past contributors. Now, based on comments from this thread, the formerly FLOSS project is somehow granting special access to a corporation that apparently is invested in going way…
of course they also gave away their own claim to be the copyright owner, but that's neither here nor there ; )
Re: Claude Code uses Bun written in Rust now
#74Honestly, I initially thought rewriting an entire codebase with AI would be a huge mistake. After reading this, I'm starting to think I was wrong. If projects like Bun can be substantially rewritten and shipped to millions of users, it suggests we're entering a very different phase of software development. Today's AI-generated rewrites may not produce code that humans would consider high quality or maintainable. But…
> But I'm beginning to wonder whether that will even matter in a few months.
At that point, even Bun itself doesn't matter. All intermediate tools don't matter if LLMs can reliably write something large.
The problem is that LLM is not quite there yet. The rewrite was only possible because they mostly stick to 1-to-1 translation resulting in non-idiomatic Rust code. So, what from there? I don't think they can really build up a sane codebase from that state. They only shot themselves with a bigger gun.
Re: Claude Code uses Bun written in Rust now
#75Earlier quoted context omitted.
I don't care about the language, but pre-releases the community don't get access to but released (Anthropic) applications do have access to, feels a bit too on the nose after the acquisition.
The whole point of the outrage was that 1.4 was merged into main. Publicly. So I’m not sure what you mean. Everything is in the open: PR #30412
> The whole point of the outrage
Ok, go ask those people what they think then, I feel no outrage over a project switching language or merging whatever. But when once-semi-transparent projects become more opaque after an acquisition, I'm starting to readjust anything to the project I had in mind.
Re: Claude Code uses Bun written in Rust now
#76Bah. Personally my take on the entire affair is quite negative, whatever Jarred or Simonw says about it. I think Bun owned by Anthropic and the entire rewrite with AI is not the real point (even if it's quite interesting, though). My take is that Jarred, and Bun,didn't demonstrate a serious, adult approach, from "this is my branch, you are overreacting" message to just proceeding with a 1mil+ PR merged in less than m…
Haha TS7 is the next biggest example of, "Let's just do a line by line port to another language instead of seriously examining our architecture"
Re: Claude Code uses Bun written in Rust now
#77Earlier quoted context omitted.
That PR is the rust rewrite. That's some time in the past now. As of this comment, there is no tagged 1.4 release. This is the present. Anthropic is using apparently a version of Bun that is not publicly available. This is orthogonal to it being Rust-based, as all Bun releases now will be.
It's publicly available in the GitHub repository and if you run "bun upgrade --canary" - https://github.com/oven-sh/bun/releases/tag/canary
That commit (and main) still purports to be 1.3.14, the version numbers haven't changed. Does that not still suggest Anthropic is using something else?
Re: Claude Code uses Bun written in Rust now
#78Earlier quoted context omitted.
It's largely just what jarred is willing to accept this week afaik or not, and they did put the bun 1.4.0 version bump in the changelogs for claude code a while ago, over a month almost. Though most will be forgiven to not reading it since well it's all AI anyways. I don't know how I feel about all this yet, maybe someday.. ooof
> they did put the bun 1.4.0 version bump in the changelogs for claude code a while ago, over a month almost. Where? Is see no CHANGELOG in the root. I do see LATEST, last modified 2 months ago, and it says 1.3.14
The Claude Code release notes. Not the Bun release notes: https://github.com/anthropics/claude-code/releases/tag/v2.1....
> Upgraded the bundled Bun runtime to 1.4
(Though that doesn't clarify that this is the Rust rewrite)
Re: Claude Code uses Bun written in Rust now
#79Earlier quoted context omitted.
Why does changing to Rust kill the project? I don't understand the point here.
> Why does changing to Rust kill the project? I don't understand the point here. I'm concerned that the complete rewrite in an entirely different language is not a sound technical decision and instead is a ploy to shed copyright claims from past contributors. Now, based on comments from this thread, the formerly FLOSS project is somehow granting special access to a corporation that apparently is invested in going way…
> I'm concerned that the complete rewrite in an entirely different language is not a sound technical decision…
Even if this was a terrible technical decision, it is a good, maybe even unavoidable, business decision. And I don’t think moving to Rust was a bad technical decision at all, given Zig is unstable and constantly changing, and that it’s not memory safe, which is a big problem for something like a JS runtime!
The reason it’s a necessary business decision is that Bun is owned by an AI company and Zig has a policy to not accept AI assisted contributions, making it impossible for Anthropic to contribute to a language that is still evolving rapidly, not to mention the bad marketing of using a language that basically is hostile to your product.
Re: Claude Code uses Bun written in Rust now
#80Earlier quoted context omitted.
That PR is the rust rewrite. That's some time in the past now. As of this comment, there is no tagged 1.4 release. This is the present. Anthropic is using apparently a version of Bun that is not publicly available. This is orthogonal to it being Rust-based, as all Bun releases now will be.
Come on, "not publicly available"? You know how git works right? Each Claude release probably has the HEAD of main compiled as "1.4.0" until there is a real official release.
I do know how git works and in my experience, while the version number sometimes doesn't get bumped until just before a release is tagged, the version number comes from the codebase. If they're building something that says 1.4.0, then they have a codebase that disagrees with ours.