A simple and powerful JavaScript animation library

A utility-first CSS framework for rapidly building custom user interfaces.

A lightweight cache for file metadata, ideal for processes that work on a specific set of files and only need to reprocess files that have changed since the last run

Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Deeply merge 2 or more objects respecting type information.

Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Load node modules according to tsconfig paths, in run-time or via API.

`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadable

micromark utility to decode numeric character references

webpack Validation Utils

Give a regex, get a robust predicate function that tests it against a string.

HTTP content negotiation

Map of URL attributes in HTML

Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

mdast extension to parse and serialize MDX.js ESM (import/exports)

A helper to optimistically set Symbol.toStringTag, when possible.

Push an array of items into an array, while being robust against prototype modification

Fill in a range of numbers or letters, optionally passing an increment or `step` to use, or create a regex-compatible range with `options.toRegex`

Store information about any JS value in a side channel. Uses WeakMap if available.

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