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Bun is tackling stability and performance on two fronts: a recent patch fixes native-code memory leaks, stopping persistent native memory growth that hurt long-running services and making Bun more viable for production use. At the same time, an experimental Rust rewrite has reached 99.8% test compatibility on Linux x64 glibc, signaling major progress toward a more robust, memory-safe core. Together these developments reduce native resource risk today and point to long-term benefits from Rust’s safety guarantees, positioning Bun as a stronger competitor to Node.js and Deno for server and tooling workloads.
Memory stability and a Rust-based core directly affect runtime reliability and operational costs for long-running services. Tech professionals should reassess Bun for production use and consider migration, tooling, and security implications as the project shifts languages.
Dossier last updated: 2026-05-23 13:42:00
Electrobun 2.0 will be decoupled from Bun due to the rust rewrite
Electrobun 2.0 will be decoupled from Bun due to the rust rewrite
A contributor submitted a fix to Bun that addresses native-code memory leaks, aiming to eliminate persistent native memory growth in the JavaScript runtime. The pull request (oven-sh/bun#30875) and a Reddit discussion by user tuyen-at-work show the change targets Bun’s native allocations rather than JS-managed memory, improving stability and reducing memory usage for long-running processes. This matters for developers and companies using Bun in production—especially servers and tooling—because memory leaks in native modules can cause crashes, degraded performance, and higher infrastructure costs. The patch helps Bun compete as a reliable, high-performance alternative to Node.js and Deno by tightening native resource management.
Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc
Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc