Extremely simple zero-dependencies ES6 LRU (you probably want lru-cache instead)

browser-side require() the node way

JavaScript Standard Style

simpler faster substitute for LRU

Convert millisecond durations to English and many other languages.

A lightweight library that provides tools for organizing asynchronous code

complete type checking for node

data structures with idiomatic JavaScript collection interfaces

fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as recursive mkdir, copy, and remove.