Industry · 3 hours ago
Bun migrates core components to Rust
The JavaScript runtime Bun is undergoing a significant transition by rewriting its internal codebase from Zig to Rust. This architectural shift aims to improve long-term maintainability and performance across the runtime's core subsystems. The transition marks a major departure from the project's original implementation language.
First reported by simonwillison.net · developing for 3 hours · simonwillison.net
Why it matters
Changing the foundational language of a major runtime signals a shift in the project's technical strategy and development priorities.
Context
Bun previously relied on Zig for its low-level system programming and memory management capabilities.