According to the homepage:

Fresh routes are dynamically server-rendered Preact components

I can't find anything in the docs that lets you render to static files on disk, and the deployment documentation requires Docker or some other way to run a web server. Fresh looks really neat for building a web server, but does not support the pre-rendering that's core to the Jamstack architecture.

(Have I gravely misunderstood what "pre-rendering" means? Is Jamstack using it to mean "rendering HTML on the server, rather than the client"?)