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How is the Bun Rewrite in Rust going?

https://lockwood.dev/ai/2026/07/27/how-is-the-bun-rewrite-in-rust-going.html
50•tomlockwood•59m ago

Comments

brap•22m ago
If you’ve ever worked at a tech company you already know the answer without reading any further
raincole•19m ago
Yeah, the answer is that it's gonna working fine for most users.
tomlockwood•20m ago
Author here: An apology on the graphs, they just count rust files touched in commits, not total commits. So if there were two commits and one touched 3 .rs files and another touched 2, it'd be counted as 5 for the purposes of the graphs. I may fix this later but, yeah.
alienbaby•14m ago
what kind of difference from the actual numbers does it result in?
tomlockwood•11m ago
Not sure! I cludged together a counter using git log. I could go back and redo it but I think the number would serve my point either way.
abalashov•19m ago
I did suspect that the triumphalist pronouncements, and even the seemingly honest and forthright deep dive, were a little premature.

This is a key problem with LLM exuberance: it's very tempting to trade on decades of experience in software using LLMs, because one is tired of typing and manual figuring-out, it seems to work if you're competent, and the payoff is essentially immediate. The real bill comes in the mail much later.

reliabilityguy•16m ago
Many repeat the point of “$165k is cheaper than team of multiple engineers working on the rewrite for a year”, which I think is flawed — the team of engineers would have produced idiomatic rust, and it would take probably 100k+ of tokens more to make the bun in rust idiomatic rust.
Tinkeringz•3m ago
I feel your estimate of tokens is a few orders of magnitude off, it’s on the low side.

I use more (albeit cached) when centering a div.

muglug•16m ago
This post doesn’t make sense. It was rewritten in Rust. The rewrite itself is complete (no more Zig).

Various people have claimed that Bun in Zig had a lot of tech debt. If they’re to be believed, it seems natural to assume the rewrite does, too. Perhaps all this activity is paying down some of that debt.

abalashov•13m ago
> Perhaps all this activity is paying down some of that debt.

Perhaps. But were that the case, one would think they'd be quite eager to say so.

muglug•6m ago
Maybe they will!

Are you expecting them to live-tweet their work or something?

rk06•9m ago
bun in zig was used by many companies. some were using it in prod. how many of those are using it in prod? none, because bun in rust is not released yet.

Hence, the author concludes that rust rewrite is not complete as bun in rust is not released yet.

I agree with author's POV.

virajk_31•8m ago
Author kept "going" in title because there has been no minor/major release in last two months which unusual for this project if you review the older releases.
cowl•5m ago
vortegne•13m ago
I didn't follow the thing too closely when it happened. Sure, I was aware of the big picture. But wow, I didn't expect that after all this noise there still hasn't been a release? That's just crazy to me.

I shouldn't be surprised though, of course. Giving any credit or slack to a high-valuation LLM company is a silly endeavor.

yearesadpeople•11m ago
> _"...Canny..."_

What a time to be alive

rob74•3m ago
Yeah, I noticed that too and kept wondering who this Canny was? Felt a bit un-Canny...
tech dept is not a problem. to paraphrase captain Jack sparrow. "even if it were the most indepted working software project, IT WORKED". On the other side of the medal we have a rewritten software that although it's trumpeted for it's rewrite speed, it is not showing the same Release speed as the manualy written, "tech dept ridden" old one.

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