JS: Bun 1.4, with Rust

Bun 1.4 | Bun Blog

Bun is the complete toolkit for building and testing full-stack JavaScript and TypeScript applications.

Bun 1.4 adds +1,517 tests from the Node.js test suite - our biggest jump in Node.js compatibility since Bun 1.0. Bun v1.4 also fixes over 2,900 issues. It reduces idle CPU usage by 5x, reduces memory usage by up to 35%, and starts 50% faster on Linux. It adds Bun.Image, Bun.WebView, Bun.markdown, Bun.cron(), Bun.Terminal, bun run --parallel, bun test --parallel, bun audit fix, bun dedupe, and bun prune. And it rewrites Bun from Zig to Rust.

"Everything that can be rewritten in Rust will be rewritten in Rust" is the modern software industry's playful variation of Zawinski's Law (which originally stated that every program attempts to expand until it can read mail). Often referred to by the acronym RIIR (Rewrite It In Rust), this meme has transitioned from an internet joke into a massive, industry-wide reality for infrastructure, security, and foundational developer tools. [1, 2]

🚀 Why the Hype is Real

The relentless push to rewrite software in Rust stems from three main advantages:

Memory Safety without a Garbage Collector: Rust eliminates entire classes of vulnerabilities (like use-after-free or buffer overflows) at compile-time without sacrificing performance. [1, 2]
Fearless Concurrency: The ownership model makes multithreading safe by catching data races before the code ever runs. [1]
Massive Performance Gains: Replacing older, fragmented, or interpreted stacks with Rust frequently yields dramatic speedups and cost reductions. [1, 2]