Nakamura is a structureless*, "cache what you want" library. If you are interested in a version with more utility and features, check out the featured forks section.
*Nakamura doesn't provide classes for different data types (such as users, channels, messages, etc.), instead it let's you handle the data yourself.
Currently, the documentation is not hosted. However, if you want to view it, install dev dependencies and run npm run doc, then open out/index.html, or spin up a local webserver with python -m http.server and navigate to http://localhost:8000/out (or just start the webserver in the out/ directory)