molarmanful/lin

A mature, feature-complete library to parse command-line options.

Generates command-line usage information

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with different data types like numbers, big numbers, complex numbers, fractions, units, and matrices.

Bindings for RE2: fast, safe alternative to backtracking regular expression engines.

quote and parse shell commands

Portable Unix shell commands for Node.js

Polyfill for Tc39 Stage 3 proposal Temporal (https://github.com/tc39/proposal-temporal)

The iterable toolbox

Rust bindings for lin.

Simple combinatorics like power set, combination, and permutation in JavaScript

Lens-like functionality with a lodash-style interface.

The ultimate JavaScript string library