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Make a callback- or promise-based function support both promises and callbacks.

Validate and normalise user choice: array, object or both?

Determine whether none of the points common to both geometries intersect the interiors of both geometries.

Reads / writes floats / doubles from / to buffers in both modern and ancient browsers.

The best of both `JSON.stringify(obj)` and `JSON.stringify(obj, null, indent)`.

Various hash functions that could be run by both browser and node

Stylistic rules for ESLint, works for both JavaScript and TypeScript.

Helps you write code with promise-like chains that can run both synchronously and asynchronously

A 100% compliant, self-hosted javascript parser with high focus on both performance and stability

Keyboard manager which works in identical way on both iOS and Android

PostCSS plugin to replace overflow-wrap with word-wrap or optionally retain both declarations.

Smallest/simplest possible means of using btoa with both Node and browserify

A library of cross-platform tested terminal/console command strings for doing things like color and cursor positioning. This is a subset of both ansi and vt100. All control codes included work on both Windows & Unix-like OSes, except where noted.

Library to help write libraries that accept both promises and callbacks.

Strip or extract comments, strings or both from source code.

QRCode / 2d Barcode api with both server side and client side support using canvas

Allows users to use generators in order to write common functions that can be both sync or async.

Set, Get, Remove cookies on both client and server side with Next.js

Postgres provider for Mastra - includes both vector and db storage capabilities