BUN'S RUST REWRITE REACHES 99.8% TEST COMPATIBILITY

DEV DESK■ 1 MIN READ

SAT, MAY 9, 2026

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Bun's experimental Rust rewrite has achieved 99.8% test compatibility on Linux x64 glibc systems. The milestone marks significant progress in the JavaScript runtime's ongoing port from Zig to Rust.

The Bun team announced that their Rust-based implementation now passes nearly all compatibility tests on Linux x64 with glibc. This follows the project's earlier transition away from Zig, driven by performance improvements and developer familiarity with Rust. The nearly complete test coverage on this primary target platform suggests the rewrite is nearing a functional parity with the original codebase. Support for additional platforms and architectures remains in progress. Bun aims to maintain its positioning as a fast, all-in-one JavaScript toolkit. The Rust rewrite represents a significant engineering effort to improve performance and maintainability while preserving compatibility with existing code. Full deployment timelines and additional platform support details remain unclear.

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BUN'S RUST REWRITE REACHES 99.8% TEST COMPATIBILITY

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