Bun 1.4 Arrives on Vercel Functions
💡Evaluate Bun’s Rust rewrite and improved Node.js compatibility directly in Vercel’s serverless runtime.
⚡ 30-Second TL;DR
What Changed
Bun 1.4 is available as an opt-in runtime for Vercel Functions.
Why It Matters
Teams running serverless JavaScript workloads can evaluate improved Bun compatibility and performance without leaving Vercel. However, the opt-in model and breaking changes make staged testing important before production migration.
What To Do Next
Create a staging deployment with bunVersion set to 1.4.x in vercel.json, then run your Node.js compatibility and WebSocket tests before production rollout.
Key Points
- •Bun 1.4 is available as an opt-in runtime for Vercel Functions.
- •The release rewrites Bun from Zig to Rust and adds over 1,500 Node.js compatibility tests.
- •Developers must set bunVersion to 1.4.x in vercel.json and review breaking changes.
- •Vercel supports Bun.serve(), WebSockets, Fluid compute, and frameworks including Next.js, Elysia, and Hono.
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Original source: Vercel News ↗
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