Vercel Launches ƒun: A Local Serverless Function Runtime

2024-12-15

Vercel has released ƒun, a local development runtime for serverless functions, enabling developers to emulate the AWS Lambda environment locally. Supporting various runtimes like Node.js and Python, ƒun allows for quick testing and debugging of serverless functions without cloud deployment. While striving for a close approximation of the real Lambda environment, ƒun has some key differences, notably in process sandboxing and user permissions.