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CSS Object Model implementation and CSS parser
Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc
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smart-buffer is a Buffer wrapper that adds automatic read & write offset tracking, string operations, data insertions, and more.
Open stuff like URLs, files, executables. Cross-platform.
Support for import attributes in acorn
Full BCP 47 language subtag data from the official IANA repository, in JSON format with multiple indices.
Fast CSS Selectors API Engine
Runtime typescript and ESM support for Node.js
Fast Color Parsing and Manipulation
Simple check to see if current app is running in browser
Encodings that map abstract data to visual representation.
The `util.is*` functions introduced in Node v0.12.
ECMAScript scope analyzer for ESLint
Streaming http in the browser
Create your own toolbar items that control story rendering
A collection of utility libraries used by other Facebook JS projects
Native Abstractions for Node.js: C++ header for Node 0.8 -> 23 compatibility
Persistent ordered mapping from strings
A React helper hook for storing latest value in ref object (updated in useEffect's callback).
micromark extension to support MDX or MDX JS expressions