Claude Code most likely only uses a tiny fraction of Bun/Node features, so Claude Code switching to the Rust rewrite doesn't mean all that much.

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klausa 2 hours ago | parent | next [-]

Look, I understand being skeptical of the whole process; the discourse about this has been extremely tiring.

But at some point if “moving one of the biggest actively maintained and used codebases to it without anyone noticing” is dismissed as “it doesn’t mean all that much”, then we’ve lost the plot a little bit somewhere.

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flohofwoe 2 hours ago | parent | next [-]

It's the equivalent of porting Unreal Engine 5 to another language and then using it exclusively to run a 2D Tetris clone. Let's wait for the next Bun release when more real-world code is hammering it before declaring victory.

(also, fwiw, a manual rewrite would be under the same scrunity and suffer from the same skepticism, at least when obviously rushed).

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klausa 2 hours ago | parent | next [-]

If you ported UE5 to, idfk, Malbolge and ran Tetris on it and someone would dismiss it as “not impressive”, I would think they lost the plot too!

	▲	chuckadams 22 minutes ago \| parent \| next [-]
		If you could successfully write Tetris in Malbolge, I would call that impressive indeed. Just writing Hello World was a major effort IIRC. The nature of the malbolge interpreter makes it more of a cryptography exercise than a coding one.
	▲	miroljub 2 hours ago \| parent \| prev [-]
		You just compared Rust to Malbolge :)

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Klonoar an hour ago | parent | prev | next [-]

You have absolutely no way to know this though.

Like, come on already.

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someguyiguess 2 hours ago | parent | prev [-]

Is it though? What’s your source for that data?

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windexh8er 2 hours ago | parent | prev | next [-]

This is akin to saying "we replaced the tires on the car and the average user didn't notice". If the entire car was replaced, then maybe we get a bit more excited.

However if "replacing small sections of code" is heralded as "the most amazing achievement in software development" then we've all lost the plot a little bit somewhere.

It makes sense both ways, no?

The reality is, of course, most people aren't going to notice. If the functionality and performance is 1:1 why would they? Is it impressive? A bit, but not how you're positioning it. People seem to forget LLMs are good at what they've learned from training data. And the LLM is good at compressing time. The only notable thing about these types of marketing spins is that a rewrite was accomplished in a small time frame that was hard to pull off before LLMs. The actual act of the move is less so.

Did the codebase improve? Is it more performant? I've seen nothing to really stake those claims with any objectiveness. Lastly: what was gained?

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SoftTalker 27 minutes ago | parent | prev [-]

Why is porting a program from one language to another seen as some great achievement? We had f2c in the 1990s.

https://en.wikipedia.org/wiki/F2c

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NiloCK 2 hours ago | parent | prev | next [-]

I'll bite.

Claude code interacts with many system processes, files, etc, as well as external APIs. Processes audio via built in dictation. Manages a bunch of nasty auth. Etc etc.

What are the categories of features that wouldn't be exercised by this class of software?

	▲	BearOso 2 hours ago \| parent [-]
		Yeah, but a lot of hard work is done by those libraries. Interaction with external interfaces would go through the tools API, which I imagine would all use the same type of code that they could focus on fixing quickly.

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Jarred an hour ago | parent | prev | next [-]

Claude Code is a large codebase and uses tons of Node’s features either directly or indirectly through dependencies. fetch(), node:http, node:tls, node:os, node:net, node:fs, AbortSignal, node:child_process, node:tty, node:process, node:http2, etc.

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aureate 2 hours ago | parent | prev | next [-]

A bigger factor is that Claude Code is owned by Anthropic. They can view issues in the combined CC+Bun as issues in one overall thing that they own. They can reproduce and test them and "Claude Code works" can be used as a target for agentic iteration on Bun.

To release this to the world and not have it be a catastrophe, they need to have confidence that Bun itself satisfies the promises that it has made, both explicitly and implicitly (bearing in mind Hyrum's law!) to all those projects out there using it, none of which are owned by Anthropic and many of which are not source visible to them. It's a much, much higher bar.

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a2800276 2 hours ago | parent | prev | next [-]

You didn't seriously expect Anthropic to seriously maintain bun as a general purpose plattform? It's clearly the Claude Code Runtime that you're graciously allowed to continue to use for your toy projects.

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2 hours ago | parent | prev [-]

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