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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.
Full BCP 47 language subtag data from the official IANA repository, in JSON format with multiple indices.
Open stuff like URLs, files, executables. Cross-platform.
Fast CSS Selectors API Engine
Support for import attributes in acorn
Runtime typescript and ESM support for Node.js
Simple check to see if current app is running in browser
ECMAScript scope analyzer for ESLint
Encodings that map abstract data to visual representation.
Create your own toolbar items that control story rendering
Fast Color Parsing and Manipulation
Streaming http in the browser
The `util.is*` functions introduced in Node v0.12.
Native Abstractions for Node.js: C++ header for Node 0.8 -> 23 compatibility
A collection of utility libraries used by other Facebook JS projects
Compare items in two sequences to find a longest common subsequence
Persistent ordered mapping from strings
Polyfills for various browsers including commonly used language features