Missing documentation on how to handle refcursors

[maarre]

I have a stored function returning a refcursor. I am able to retrieve the "<unnamed portal 1>" from the call. But I cannot figure out how to retrieve the rows of the refcursor.

            logger.debug(`refcursor=${refcursor}`)
            const cursor = conn`FETCH ALL IN "${refcursor}";`.cursor()

Further down there is a catch clause logging the error.

[12:36:10.198] ▶ DEBUG refcursor=<unnamed portal 1> src=dogwrapper
[12:36:10.200] ▶ ERROR fn_dogs_aggregate_v1: "Caught PostgresError: could not determine data type of parameter $1, rethrowing.