An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.
ES2017 spec-compliant Object.values shim.
Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag
Improved typeof detection for node.js and the browser.
TypeScript-first schema declaration and validation library with static type inference
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value negative zero? === will lie to you
Simple and complete React DOM testing utilities that encourage good testing practices.
ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.
An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.
Helper functions for V8 coverage files.
Determine if the JS environment has BigInt support.
ECMAScript spec-compliant polyfill/shim for `globalThis`
Unbox a boxed JS primitive value.
Determine if a value is an ES6 Symbol or not.
ES2017 spec-compliant Object.entries shim.
An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.
Helper package to shim a method into `Array.prototype[Symbol.unscopables]`
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
A collection of essential TypeScript types
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
This plugin adds `TypeScript` support to `eslint-plugin-import`
ES proposal-spec-compliant Object.fromEntries shim.
Is this value an ES BigInt?