Bun creator Jarred Sumner has officially merged a massive pull request rewriting the runtime in Rust. Leveraging Anthropic’s Claude to assist with the port, the transition aims to solve persistent memory leaks that have historically challenged the project. Despite the total architectural shift, Sumner confirmed that the new Rust-based implementation passes all existing tests across every supported platform with zero performance regressions.
This milestone follows Anthropic's acquisition of Bun late last year, signaling a deeper integration between the high-performance runtime and AI development tools. Moving forward, the team plans to implement this port internally within Claude Code. This move highlights a growing trend of using LLMs to execute complex, large-scale systems engineering tasks while maintaining the strict performance benchmarks required by a tool designed to be faster than Node.js.
