The Bun transpiler has been rewritten in Rust after its acquisition by Anthropic in December 2025. This transition aims to enhance stability and performance, addressing existing bugs and challenges in the Bun ecosystem.
Bun initially began as a line-for-line port of esbuild's JavaScript & TypeScript transpiler from Go to Zig, developed by a single engineer within a year. Its comprehensive feature set includes a transpiler, package manager, and various API implementations.
Currently, Bun's command line interface (CLI) is experiencing significant usage, accumulating over 22 million monthly downloads. Several popular tools rely on Bun as their runtime, with support from major platforms like Vercel and DigitalOcean.
Despite its success, Bun has faced stability challenges, evidenced by bugs fixed in version 1.3.14, including significant use-after-free crashes and memory leaks.
The decision to rewrite Bun in Rust was influenced by the need to address stability concerns while leveraging Rust's performance capabilities. This rewriting signifies a commitment to the growth and robustness of the Bun ecosystem.
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The Bun transpiler has been rewritten in Rust after its acquisition by Anthropic in December 2025. This transition aims to enhance stability and performance, addressing existing bugs and challenges in the Bun ecosystem.