Developer voices concern that Anthropic’s ownership of Bun could undermine the JavaScript runtime despite strong technical foundations

The author praises Bun as fast, practical software that improves TypeScript, testing, bundling, and tooling workflows. But after Anthropic acquired Bun in December 2025, they worry that Anthropic’s weak product execution around Claude Code may signal poor stewardship despite promises to keep Bun open source and focused on Node.js compatibility.

The concern reflects a broader tension when critical developer infrastructure becomes tied to an AI company’s product strategy. Even if Bun remains MIT-licensed, trust may depend on whether Anthropic can maintain developer confidence through reliable tooling, transparent governance, and continued investment beyond its own AI coding needs.

I am worried about Bun