Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment

Determine if the JS environment has Symbol support. Supports spec, or shams.

ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim

Implementation of the AG-UI protocol for LangGraph.

Primitives for managing disposable state in React

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

The CoSE layout for Cytoscape.js by Bilkent with enhanced compound node placement

Various graph generators for graphology.

Determine if a function is a native generator function.

Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.

Returns an array of Typed Array names that are available in the current environment

Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.

The headless components for Svelte.

ES proposal-spec-compliant Object.fromEntries shim.

Does this JS environment support the `name` property on functions?

Topological sort of directed ascyclic graphs (like dependecy lists)

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

Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.

Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.