Higher-order functions and common patterns for asynchronous code
Full featured Promises/A+ implementation with exceptionally good performance
The semantic version parser used by npm.
Tiny millisecond conversion utility
A logger for just about everything.
parse argument options
Promise based HTTP client for the browser and node.js
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as mkdir -p, cp -r, and rm -rf.