Bun's Rust rewrite has been merged
Summary
Bun, the JavaScript runtime and package manager, has merged a rewrite of its core from Zig to Rust, potentially improving performance and maintainability.
Similar Articles
Rewrite Bun in Rust has been merged
The Bun JavaScript runtime and toolkit has been rewritten in Rust, marking a major change from its original Zig implementation.
I cant decide if Bun's AI-heavy Zig-to-Rust rewrite is the future, or a giant warning sign
Anthropic acquired Bun and used AI agents to rewrite its codebase from Zig to Rust, a massive 1M-line change that passed 99.8% of tests, raising both excitement about AI's potential for infrastructure rewrites and concerns about reviewability, unsafe Rust, and hidden bugs.
@seclink: Bun is a high-performance JavaScript runtime released in 2022, designed as an alternative to Node.js. Despite its strong performance, its Zig-based codebase faces stability challenges. Sumner used Anthropic's Claude…
Sumner successfully ported 960,000 lines of Bun runtime code from Zig to Rust using Anthropic's Claude AI, demonstrating the significant efficiency potential of AI in code rewriting.
@trq212: Jarred tried rewriting Bun in Rust and it passes 99.8% of the existing test suite we're not being ambitious enough
A developer named Jarred successfully rewrote parts of the Bun runtime in Rust, achieving a 99.8% pass rate on the existing test suite, highlighting a discussion on engineering ambition.
Quoting Mitchell Hashimoto
Mitchell Hashimoto comments on the increasing fungibility of programming languages, using Bun's rewrite from Zig to Rust as an example, suggesting that languages are no longer a source of lock-in.