Summary & Key Takeaways ​

• Bun 1.4 has been rewritten in Rust, enhancing its core performance and stability.
• It introduces built-in headless browser automation via Bun.WebView.
• New APIs for image manipulation (Bun.Image), Markdown parsing (Bun.markdown), JSON5, JSONL, Terminal, and cron are now available.
• Node.js 26.3.0 compatibility has been significantly improved with 1,517 new passing tests.
• The release includes parallel test and run capabilities.
• Windows ARM64 is now supported.
• An opt-in global virtual store can lead to up to 7x faster package installs.

Our Commentary ​

Okay, Bun 1.4 is just wild. A full rewrite in Rust? That's a massive undertaking. We're talking about a fundamental shift here. And then they just casually drop "built-in headless browser automation." That's a game-changer for testing and scraping, potentially cutting out a whole dependency layer. The speed claims are always impressive with Bun, but 7x faster installs with a global virtual store? I'm genuinely curious how that plays out in real-world dev workflows. It feels like Bun is trying to be everything for JavaScript developers, and honestly, I'm here for it. The ambition is palpable.