How to remove unused npm packages?

Question

ubuntu

I recently started learning Grunt.
And here's the crux of the matter:
Let's say I install package
npm install SomePack --save-dev
A, a bunch of other plugins are installed in place with it.
A little later I removed SomePack:
npm uninstall SomePack
Are all dependency plugins removed too? Or stay?
And how can I "clean" from unused plugins?
For example, I only use SomePack1and SomePack2. Accordingly, I only need them and their dependencies. How to remove everything else?
Maybe there is some command "Delete everything" or "Delete everything except ..."?

Answer 1

See how the directories are organized all in node_modules
All SomePack1 dependencies are in its directory
Dependencies are not rummaged

Answer 2

Remove unused packages from the cache
$ sudo apt-get autoclean
Cleaning the cache in Ubuntu, apt utilities:
$ sudo apt-get clean
Remove unnecessary dependencies:
$ sudo apt-get autoremove