Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Claude Code uses Bun written in Rust now

simonwillison.net

Post reply on HN
Print view View original

531–540 of 920 posts

Re: Claude Code uses Bun written in Rust now

#531

Post by frollogaston »

abc42 wrote: post #506
weakfish wrote: post #212

Maybe I’m taking crazy pills, but I’m still stuck on “why the hell does a TUI need to run in terminal React by way of JavaScript” The fact that Anthropic felt the need to buy a runtime so they could make their TUI better speaks more to the quality of engineering than anything else IMO. If rewrites are so easy, why not rewrite CC in a native language? Would’ve been a hell of a lot cheaper.

>If rewrites are so easy, why not rewrite CC in a native language? Would’ve been a hell of a lot cheaper. Yeah, good question. OpenAI decided to rewrite Codex in Rust about a year ago[0]. In fact, since rewrites are that easy, what do we need Bun for? Why doesn't everybody just port all of their Javascript code into Rust? [0] https://github.com/openai/codex/discussions/1174

Code verbosity and complexity still matter with LLM coding

Re: Claude Code uses Bun written in Rust now

#532

Post by hahahaa »

vmg12 wrote: post #491
wild_egg wrote: post #462

Earlier quoted context omitted.

There are two different arguments here. > These apps are doing real work taking text that is streaming in and doing syntax highlighting, calculating diffs, and rendering markdown. The first argument is that these are expensive operations. They are not. And the second argument is the assumption that these are desirable things for an agent system to be doing. That's a personal preference but, personally, I don't want t…

The argument is that doing it all on a single thread will result in high cpu utilization and that is what makes the power usage spike and the pc feel hot. Thats it. A lot of people go “js is bad” reflexively and they are right for the wrong reasons. Its not because js (specifically v8) is slow. I have many websites and web based apps open and none fuck up my laptop as hard as claude code.

Yeah I don't get it we had terminals on single core machines. In early 2000s I am sure they could handle the UI of Claude (probably IO too).

Re: Claude Code uses Bun written in Rust now

#534

Post by hahahaa »

mixmastamyk wrote: post #479
vmg12 wrote: post #412

Earlier quoted context omitted.

Drawing to the terminal / rendering / whatever, this is all arguing semantics and very uninteresting and not insightful. > they need a high powered game engine rendering loop Don't believe the bs on twitter. Claude code source was leaked, there is no high powered game engine rendering loop. > It needs to stream text to stdout These apps are doing real work taking text that is streaming in and doing syntax highlightin…

Stuff doable on a pentium 90, and before that, just slowly.

I wonder if those were fast enough nostalgia says yes but I bet it was dog slow if we tried today with 2026 lens.

Re: Claude Code uses Bun written in Rust now

#535

Post by bmitc »

pronik wrote: post #477
bmitc wrote: post #220

Earlier quoted context omitted.

The outrage was more how the rewrite was communicated and defended, which was objectively poor.

Which was completely bonkers -- it happened completely in the open, people were just outraged that something like this happens without asking them and not on a schedule they perceive as adequate. Most of them haven't really grasped what was happening and why. Many still don't.

It wasn't out in the open. It was never announced or discussed ahead of time. It was just done because the company who purchased Bun wanted it done, and they only communicated it was happening once they started.

I don't consider the following comment to be good, honest, and open communication:

https://news.ycombinator.com/item?id=48016880#48019226

Re: Claude Code uses Bun written in Rust now

#537

Post by csb6 »

bitwize wrote: post #201
petcat wrote: post #12

Earlier quoted context omitted.

I think the Zig people are really just worried that maybe Zig itself is a DOA language before it has even reached 1.0 because it doesn't offer enough over C for any serious use and their flagship project has now abandoned it.

Zig is a DOA language for other reasons though. The reason why Rust enthusiasts act so morally superior is because they are: > Rob Pike, an unsafe guy, may insist that a small language and garbage collection are enough. But the typesafe visionary Grzegorz Wielbodłąński understands the deeper truth: every invalid state permitted by a compiler is a tiny act of civilizational sabotage. https://x.com/typememetics/status/…

The post you linked to seems to jump to conclusions, to say the least. For example:

> One probable outcome of an unsafe-language-dominant world is full Andrew communism, which is precisely what Andrew “Smelley” Kelley proposes: abolish ICE and replace the market economy with a globally distributed network of community-maintained allocators.

> Rather than a commercial product, software becomes a “public good,” ultimately provided by the Zig Software Foundation as manually managed digital infrastructure.

Calling him "smelley"? Really? Pulling in the political views of the founder of a language and claiming that they inform his language design as part of a grand conspiracy against Rust/capitalism? Where are they getting all of this? Free, open-source compilers and related tooling (both of which Rust and Zig have) are already public goods managed by global communities of mostly volunteers

> This future strikes me as a dystopian hellscape, but I have never met an unsafe-language advocate who could explain how this ecosystem is supposed to sustain itself without unpaid maintainers, ideological volunteers, subsidized infrastructure, and endless donations to compiler projects that still cannot protect users from basic memory errors.

How is Rust any different than Zig in this respect? Both are projects largely run by nonprofits relying on communities to promote, maintain, and improve them.

Frankly, that entire "Institute for Type Safe Memetic Research" seems like either an elaborate satire or an account run by genuinely insane people who think type and memory safety are paramount societal issues.

Re: Claude Code uses Bun written in Rust now

#538

Post by frollogaston »

vips7L wrote: post #426
cromka wrote: post #44

Earlier quoted context omitted.

I am getting into the frontend dev and one thing that I don't understand is why people use bun in the first place? It's not much better preforming, it's not much safer, it's still not 100% compliant. Some tests show it's actually slower than node. Why bother switching, then?

I don’t think you would use Bun for front end.

That's what Claude Code does at least

Re: Claude Code uses Bun written in Rust now

#539

Post by frollogaston »

cromka wrote: post #44
reddalo wrote: post #29

Damn, I should have not migrated to Bun. Should I revert back to Npm?

I am getting into the frontend dev and one thing that I don't understand is why people use bun in the first place? It's not much better preforming, it's not much safer, it's still not 100% compliant. Some tests show it's actually slower than node. Why bother switching, then?

So much of JS dev is just saying no to random new stuff, Bun included

Re: Claude Code uses Bun written in Rust now

#540

Post by dundarious »

harrisi wrote: post #483

Maybe I'm taking crazy pills, but I swore there have been very similar comments I've seen as the current top post by weakfish: > Maybe I’m taking crazy pills, but I’m still stuck on “why the hell does a TUI need to run in terminal React by way of JavaScript” > The fact that Anthropic felt the need to buy a runtime so they could make their TUI better speaks more to the quality of engineering than anything else IMO. >…

What's the implication or inference based upon this? So you're seeing comments sharing a general attitude. And?

As it is now, your post is meaningless to me.

Post reply on HN