JavaScript packages

Determine if a function is a native generator function.

ES spec-like internal slots

process.nextTick but always with args

React is a JavaScript library for building user interfaces.

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

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

Vitest snapshot manager

A library for parsing IPv4 and IPv6 IP addresses in node and the browser.

Which kind of boxed JS primitive is this?

Is this value an ES BigInt?

Is this value a JS SharedArrayBuffer?

A collection of token providers

Determine if the JS environment has BigInt support.

ECMAScript spec-compliant polyfill/shim for `globalThis`

🔎 A simple, tiny and lightweight benchmarking library!

Load the local package.json from either src or dist folder

ES2019 spec-compliant String.prototype.trimStart shim.

Google APIs Authentication Client Library for Node.js

Get the ArrayBuffer out of a TypedArray, robustly.

Elegant terminal spinner

An ES2015 spec-compliant `Function.prototype.name` shim

Resolve package.json exports & imports maps

Get paths for storing things like data, config, cache, etc

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

Tooling which enables you to use TypeScript with ESLint

Unbox a boxed JS primitive value.

A per-spec XML serializer implementation

fast and safe way to escape and unescape &<>'" chars

split a Text Stream into a Line Stream, using Stream 3

An arbitrary-precision Decimal type for JavaScript.

Is this value a JS ArrayBuffer?

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

TypeScript Execute (tsx): Node.js enhanced with esbuild to run TypeScript & ESM files

Core istanbul API for JS code coverage

Node is running but you don't know why? why-is-node-running is here to help you.

Get the metadata from a Google Cloud Platform environment

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

A Long class for representing a 64-bit two's-complement integer value.

TypeScript definitions for chai

[](https://github.com/mmkal/expect-type/actions/workflows/ci.yml)  [](ht

Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?

a CSS selector compiler/engine

return list of CallSite objects from a captured stacktrace

Utility module to print pretty messages on SIGINFO/SIGUSR1

Utilities for determining if characters belong to character classes defined by the XML specs.

Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

ES5 spec-compliant shim for String.prototype.trim

A tiny invariant function

Robustly get the length of a Typed Array

Test whether an object looks like a promises-a+ promise