pkg-\*- example of modern packages
consumer-lib-\*- example library consumers of modern packages
consumer-\*- example consumers of modern packages
If you want to experiment and modify package contents, you can use npm run build from root directory to propagate your changes to dependent packages.
It is not a monorepo, each folder is a separate package. Packages are linked as \*.tar.gz files prepared with npm pack. With such approach structure of node_modules is the same as when packages are installed from a registry.