fs-extra
fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as recursive mkdir, copy, and remove.
chokidar
Minimal and efficient cross-platform file watching library
globby
User-friendly glob matching
braces
Bash-like brace expansion, implemented in JavaScript. Safer than other brace expansion libs, with complete support for the Bash 4.3 braces specification, without sacrificing speed.
readdirp
Recursive version of fs.readdir with streaming API.