yargs the modern, pirate-themed, successor to optimist.

parse argument options

the complete solution for node.js command-line programs

option parsing and help generation

Option parser with generated usage and commands

Command line options parser

Standard input/output manager for Node.js

Option parsing for Node, supporting types, shorthands, etc. Used by npm.

Build cross platform desktop apps with JavaScript, HTML, and CSS

Command-line option parser

borderless text tables with alignment

simple, flexible, fun test framework

Parser generator for JavaScript

Power Assert feature instrumentor based on the ECMAScript AST

The most popular front-end framework for developing responsive, mobile first projects on the web.

Babel preset for TypeScript.