Logging in libraries is pretty common across different languages. It's not invasive as long as libraries do not explicitly configure loggers to create files and so on. The application is at the root of a hierarchy of loggers and can set verbosity and backends for all imported libraries.
(shameless plug: I'm maintaining [https://github.com/FedericoCeratto/nim-morelogging](https://github.com/FedericoCeratto/nim-morelogging) )
