Simple and complete DOM testing utilities that encourage good testing practices.

AI-native Excel (.xlsx) generation, parsing, and patching from plain JSON — fully typed TypeScript, 100% OOXML coverage, no Microsoft Office required

Object value retrieval given a string path

A querystring parser that supports nesting and arrays, with a depth limit

Get and robustly cache all JS language-level intrinsics at first require time

DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. It runs as JavaScript and works in all modern browsers, as well as in Node.js (via jsdom). DOMPurify is written by security people who have vast background in web a

ECL Grid

Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.

Perform async work synchronously in Node.js using `worker_threads` with first-class TypeScript support.

Determine if the current node version supports the `--preserve-symlinks` flag.

Centralized report column presentation configuration for SkyTab Analytics

Web framework built on Web Standards

Extract design systems from any website -- colors, typography, spacing, components, and layout patterns

Fire events the same way the user does

Client/server side PDF printing in pure JavaScript

Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.

Hooks for managing, caching and syncing asynchronous and remote data in React

Custom jest matchers to test the state of the DOM

Lightweight (<10KB) XLSX file creator for Browser and Node.js

An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.