People say a lot of things, especially when they have a vested interest in a positive outcome. Bun has been fully vibe coded into another language. There’s no way in hell it’s maintainable. Go read any analysis of the Claude Code leak for proof.
Sure, reasonably well at first glance, but to quote the article:
> I rewrote Bun in Rust using about 50 dynamic workflows in Claude Code run continuously over the course of 11 days.
> Excluding comments, Bun is 535,496 lines of Zig.
> How do you review a PR with +1 million lines added? How do you start to build the confidence needed to responsibly merge large quantities of LLM-authored code? A language-independent test suite with a million assertions, adversarial code review and when something does go wrong, fixing the process that generates the code instead of hand-fixing the code.
That’s vibe coding. This blog post is an ad for Claude, nothing more.
It's a direct translation without changing the overall code structure or data structures. I do think this process deserves a distinct name from blind whole-of-project vibe coding.
Translation does seem to be a strength of LLMs, and as they said in the post, the code at the function-level all still feels familiar to the team. They've also already moved users to the codebase without anyone noticing; that's a better result than typical vibe coding.
What would be the consequence to them if they did screw it up? Screwing up the maintainability of a project, especially a big one, doesn't necessarily have immediate consequences. The fallout could be delayed by a year or more. Also, they have effectively limitless tokens to burn on keeping everything looking OK, and a vested interest in doing so.
I'm not trying to spin up some kind of conspiracy theory here, but I'm not sure to what extent Anthropic does have any vested interest in this project (in fiscal terms at least) because the reputational fallout could be significantly delayed and might just not be big enough to matter.
Bun powers Claude Code. If the rewrite introduced catastrophic bugs, it would cause catastrophic bugs in Claude Code and therefore without exaggeration could cause $billions of lost revenue.
There clearly aren't catastrophic bugs. The question is whether the artifact is maintainable over time, since clearly there's a massive amount of net new code that was not thoroughly reviewed. Give it a year or so and we'll know. I claim either way, it doesn't really matter to Anthropic--if it's a disaster they might be able to keep it limping along well enough by just throwing tons of tokens at it. The value in this is not the lasting software artifact, it's the marketing of the rewrite. If over time it turns out to be a great success, all the better!
I use it all day every day and haven’t noticed any bugs.
And the fact is that they are maintaining it and it is one of the most successful software products of all time and is earning them mountains of cash. By any metric it is a successful product. So obviously whatever they are doing is working.
Powertop tells me claude-cli creates an inordinate amount of wakeups, halving my laptops battery life if I leave it open. For a tui that should be doing nothing when I'm not interacting with it...
You and the parent are arguing over different, orthogonal things. I believe the parent argues over "efficiency"(=being able to achieve a goal for given amount of ressources) while you are replying over "efficacy" (=being able to achieve a goal). Both could be called 'maintainability' and nobody explicitely tells what definition they use, so all the long pointless discussions could be avoided if people agreed on terms
There are different definitions of "maintainable". It seems the prevailing culture at Anthropic is to not touch code manually anymore. So for them "maintainable" means the LLM can fix it.
