Functions like `output` are partial with no documentation

When I try to write to a file where the directory doesn’t exist it crashes at runtime.

It would be nice if
a) either the possible IOExceptions are documented or
b) it returned a `Maybe` or `Either` or even
c) it can be type-checked whether the system knows if this folder can exist (which probably is a silly idea)

The issue names no file or test; start by locating the implementation and documentation for `output`, then reproduce the failure when its directory is missing. Review existing error-handling conventions before determining whether to document the possible IOException or change the API, and confirm the chosen behavior with relevant checks.

Written by the indexing model from the issue text.