A Function Should Know Where It Runs

There is an obvious appeal to a server function you can call from anywhere. The old version of the same idea was not pleasant. You wrote an endpoint, then a client helper for that endpoint, then some shared schema to keep the two sides honest, then error handling in both places, and eventually a small pile of files whose main job was to move one value from the browser to the server and another value back again. So when a framework lets you write the server part as a normal function and call it a