Connect to open server while not in a Browser environment

[EniacMlezi]

In browser environment I can do:

import FHIR from 'fhirclient';
const client = FHIR.client(fhirUrl);

To connect to an open server.

Now I'm writing a little nodejs tool and would like to retrieve some resources from an open server. Doing the above will give me a TypeError: FHIR.client is not a function. What got imported was the smart(req, res, storage) function, but my little tool is not an http server, I do not have request or response objects.

I would like to be able to start a client to an open server, the same as in a browser environment, but from a nodejs tool application.