Where is fs hidden in Nodejs?

Question

Node.js

Good afternoon! I can't figure out where to put fs from npm? And in general, how to work with files at the moment?
npm -v // --3.10.10
node -v // -- v6.10.2
Thanks in advance!

Answer 1

https://nodejs.org/api/fs.html
There is an opinion that it is built into Node.

Answer 2

I hid it in yarn. Look there.