YAML 1.2 parser and serializer
a data frame library inspired by R and Python Pandas
MCP Orchestrator - Discover and install MCPs with automatic OAuth support. Uses Claude CLI for OAuth MCPs (Canva, Asana, etc). 34 trusted MCPs from Claude Partners.
Public API for OpenTelemetry
Light ECMAScript (JavaScript) Value Notation - human written, concise, typed, flexible
type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.
Browser-friendly inheritance fully compatible with standard node.js inherits()
High-priority task queue for Node.js and browsers
Lexes CommonJS modules, returning their named exports metadata
Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment
Allows users to use generators in order to write common functions that can be both sync or async.
PostCSS for CSS-in-JS and styles in JS objects
Apache Arrow columnar in-memory format
A small polyfill for Object.setprototypeof
Iterate over the own and inherited enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js
A simple, lightweight JavaScript API for handling cookies
The FinTech utility collections of simple, cumulative, and exponential moving averages.
safely create multiple ReadStream or WriteStream objects from the same file descriptor
Port of jQuery.extend for node.js and the browser
Apache Arrow columnar in-memory format
Immutable Data Collections
OpenTelemetry Tracing
An arbitrary-precision Decimal type for JavaScript.
Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.