Report Claims Bun JavaScript Runtime Is Being Rewritten in Rust

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A report published on July 8, 2026, by Simon Willison discusses the rewriting of Bun, a popular JavaScript runtime, in the Rust programming language. Bun was originally built using the Zig programming language, making this a significant architectural shift. The move to Rust may be driven by factors such as ecosystem maturity, tooling, or performance considerations. The story gained attention on Hacker News, though it attracted limited discussion at the time of publication. Further details about the timeline and scope of the rewrite were not specified in the available content.

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