An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.
ES2017 spec-compliant Object.values shim.
Simple and complete DOM testing utilities that encourage good testing practices.
TypeScript-first schema declaration and validation library with static type inference
Fast, disk space efficient package manager
ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.
Improved typeof detection for node.js and the browser.
Is this value negative zero? === will lie to you
Simple and complete React DOM testing utilities that encourage good testing practices.
An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.
Helper functions for V8 coverage files.
Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Pure random number generator written in TypeScript
Unbox a boxed JS primitive value.
An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.
ES2017 spec-compliant Object.entries shim.
Syntax highlighting with language autodetection.
Determine if a value is an ES6 Symbol or not.
Helper package to shim a method into `Array.prototype[Symbol.unscopables]`
ECMAScript spec-compliant polyfill/shim for `globalThis`
A collection of essential TypeScript types
Property based testing framework for JavaScript (like QuickCheck)
Is this value an ES BigInt?
Accessibility engine for automated Web UI testing