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How is the Bun rewrite in Rust going?

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Re: How is the Bun rewrite in Rust going?

#231

Post by simonw »

tomlockwood wrote: post #207
simonw wrote: post #204

Earlier quoted context omitted.

Why are you resistant to adding a sentence to the article that notes that Claude Code uses the rewrite? Do you think it would weaken the article? When I said it would improve the credibility I did mean it. My instinct on reading the article this morning was "this person doesn't know that Claude Code runs on Bun, which weakens their credibility in presenting the argument they are making here."

Please feel free to write an article that corrects my mistakes.

I try not to publish articles that call out mistakes by other people just for the sake of it. I've written a fair amount about the Bun rewrite already - https://simonwillison.net/search/?q=bun%20rust

Re: How is the Bun rewrite in Rust going?

#232

Post by simonw »

root_axis wrote: post #209
simonw wrote: post #195

Earlier quoted context omitted.

In this sentence, sure: > Anthropic is dogfooding this, the machine is still ticking along, and Anthropic employees are directly involved. The problem is that your article's central claim is that there hasn't been a Bun release since the Rust rewrite - which can be read as implying that the rewrite hasn't been used in production. But it's been used in production on millions of machines running Claude Code for over a…

> which can be read as implying that the rewrite hasn't been used in production. Well it hasn't. "Production" for a language runtime means being generally available for arbitrary use. The engineers that built the runtime using it to release one closed source binary to the public is, at best, an extremely narrow beta test.

It's available for arbitrary use if you run the canary release.

Re: How is the Bun rewrite in Rust going?

#234

Post by tptacek »

wesselbindt wrote: post #219
Jarred wrote: post #148

Bun’s Rust rewrite shipped in Claude Code over a month ago and barely anyone noticed. Claude Code is widely used. The Rust rewrite is going well overall. In the Bun v1.4 video, I promised a certain number of newly passing Node.js tests were added to force us to improve compatibility, and that number is not true yet. The release is delayed until it is true. The PRs to make it true are up but not merged yet. Most likel…

In Dutch there's a saying, "wij van wc eend adviseren wc eend", and it fits perfectly.

I don't see how it does. Claude Code is an extremely widely used product; the preceding comment offered an objective evaluation target, not a "trust me it's good" argument.

Re: How is the Bun rewrite in Rust going?

#235

Post by da02 »

tomlockwood wrote: post #196
inglor wrote: post #179

Earlier quoted context omitted.

Take as long as you need to ensure software quality. A month without a release isn't a big deal and whomever needs a specific feature can offer to contribute or build themselves. Node has 4-6 weeks without a meaningful release (other than security stuff) pretty much every December. I think the criticism in the article is unfounded and whomever needed/wanted a release should have asked first instead of writing an "ang…

Author here: I don't need or want another Bun release or an NPM release or anything like that. Like I very clearly say in the article I just got chatting with a peer about the Bun rewrite and I decided to take a look. I'm consistently skeptical about new tech whether it is NoSQL or Blockchain or Serverless. Some of the things I'm skeptical about fail and some succeed.

What are some of your favorite tools or services that you adopted in the past few years?

Re: How is the Bun rewrite in Rust going?

#237

Post by Banditoz »

giancarlostoro wrote: post #135
Aurornis wrote: post #122

Earlier quoted context omitted.

Claude Code has a huge userbase. This is an impressive result so soon after the rewrite. This is an impressive milestone for their rewrite. There are a lot of comments trying to downplay this as being unimpressive for some reason, but I can’t see them as anything other than sour grapes because the rewrite hasn’t crashed and burned like they were hoping.

It's just blind AI hate for no rhyme or reason. I've ported projects from one language to the next using Claude Code long before Bun even did this, it's very trivial for an LLM. In the case of Bun though, they have a test suite to run the entire codebase against, and so long as all of those tests pass, there's and drastically more likely chance that its correct.

Seems to be more level skepticism to me. Not "blind hate".

Re: How is the Bun rewrite in Rust going?

#238

Post by bendmorris »

As a comparison point, someone decided to try to fix the issues in the Zig original and is now claiming sub-second build times, plus fixed bugs, by modernizing the codebase and sticking with best practices - indicating that all of the issues that justified the rewrite were self-inflicted and addressable.

https://ziggit.dev/t/buz-a-drop-in-replacement-for-bun-using...

I have no skin in this game, and the Zig version is also using LLMs if that helps take the culture war out of it. But, it has always been true in my experience that someone who really understands a problem space can outcompete someone who just throws resources (in hundreds of thousands of dollars of token spend) at it.

Re: How is the Bun rewrite in Rust going?

#239

Post by wonnage »

SquareWheel wrote: post #20

I'm not sure how much insight we can glean from looking at the number of commits and release cadence here. In the aftermath of such a major refactor/rewrite, I would expect it to take some time to get back up to their usual development speed. Jared and the other developers are new to the Rust codebase, even if the structure is largely familiar. They're also likely focusing on other priorities right now such as tracki…

The CI/CD costs are an interesting take, most of the rebuttals to AI ROI are something like “more code doesn’t mean more value!” but if you are charging per CI run then it actually does! Particularly with CI and extra testing being the main way to prevent the loops the AI companies are shilling from going off the rails

Re: How is the Bun rewrite in Rust going?

#240

Post by philipwhiuk »

simonw wrote: post #232
root_axis wrote: post #209

Earlier quoted context omitted.

> which can be read as implying that the rewrite hasn't been used in production. Well it hasn't. "Production" for a language runtime means being generally available for arbitrary use. The engineers that built the runtime using it to release one closed source binary to the public is, at best, an extremely narrow beta test.

It's available for arbitrary use if you run the canary release.

In no world does "New iOS released" mean "there's a developer preview" which is what you're proposing.
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