In the following tutorial https://doc.wikimedia.org/oojs-ui/master/demos/tutorials/collection/basics1/contents.html, in "Add the project" section, the demo utilizes a bunch of ooui libraries oojs.jquery.min.js, oojs-ui.min.js, oojs-ui-wikimediaui.min.js. They seemed to sitting in node_modules folder and it is unclear where to get them.
It might be useful to provide a link to these libraries in the demo tutorial.