Add a package as a git submodule
npm submodule <pkg>If the specified package has a git repository url in its package.json
description, then this command will add it as a git submodule at
node_modules/<pkg name>.
This is a convenience only. From then on, it's up to you to manage
updates by using the appropriate git commands. npm will stubbornly
refuse to update, modify, or remove anything with a .git subfolder
in it.
This command also does not install missing dependencies, if the package
does not include them in its git repository. If npm ls reports that
things are missing, you can either install, link, or submodule them yourself,
or you can do npm explore <pkgname> -- npm install to install the
dependencies into the submodule folder.