Claude Code now uses a Rust port of Bun, resulting in a 10% faster startup on Linux, with the exact version being v1.4.0, which is a preview of an unreleased version from the original Bun repository. The use of the Rust port is confirmed by finding Rust source files in the Claude Code installation, and a recent commit to the package.json file also supports this version. This change is not yet reflected in a tagged release outside of the canary channel. AI summary
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In Rewriting Bun in Rust Jarred Sumner made the following claim: Claude Code v2.1.181 (released June 17th) and later use the Rust port of Bun. Startup got 10% faster on Linux but otherwise, barely anyone noticed. Boring is good. I decided t…
To a sceptic, spending $165K to migrate Bun from Zig to Rust sounds very expensive. But to a realist, shortening a 1-2 year migration down to 11 days opens amazing new opportunities for devs. However, a thoroughly-tested project is required…