How to run vercel deployment environment locally and test your Vercel Project in particular with file system

[phipsae]

I'm trying to implement a route that uses fs, and I was looking for a way to test it locally without having to deploy to Vercel every time. It works fine when running yarn start, but fails on Vercel due to the serverless environment limitations.

I came across the vercel dev command (which Vercel doesn’t officially recommend 😅), but it doesn’t work with SE2.

Has anyone found an alternative way to test such routes locally?

Thank you 🙏