ECMAScript extensions and shims

Lightweight debugging utility for Node.js and the browser

Tiny millisecond conversion utility

Array#isArray for older browsers

A querystring parser that supports nesting and arrays, with a depth limit

Runtime for Regenerator-compiled generator and async functions.

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

Implementation of Function.prototype.bind

Robustly `.call.bind()` a function

string representations of objects in node and the browser

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

Store information about any JS value in a side channel. Uses WeakMap if available.

ECMAScript spec abstract operations.

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

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

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

Determine if an object is a Buffer

An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim

ES6 spec-compliant RegExp.prototype.flags shim.

Standard library

Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag

ES spec-like internal slots

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

Determine if a value is an ES6 Symbol or not.

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

ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.

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

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

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

ES2017 spec-compliant Object.values shim.

An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.

ECMAScript spec-compliant polyfill/shim for `globalThis`

Object.prototype.hasOwnProperty.call shortcut

An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.

Is this an arguments object? It's a harder question than you think.

process information for node.js and browsers

ES proposal-spec-compliant Object.fromEntries shim.

ES2017 spec-compliant Object.entries shim.

The lodash method `_.debounce` exported as a module.

Implements performance.now (based on process.hrtime).

Modern JavaScript date utility library

Spec-compliant polyfill for String.prototype.matchAll

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

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

Get an iterator for any JS language value. Works robustly across all environments, all versions.

A window.fetch polyfill.

ES2017 spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.

Utility package to determine if an `Array.prototype` method properly boxes the callback's receiver and third argument.

A simple, lightweight JavaScript API for handling cookies

requestAnimationFrame polyfill for node and the browser

The lodash method `_.throttle` exported as a module.

ES2017 spec-compliant String.prototype.padEnd shim.

The most popular front-end framework for developing responsive, mobile first projects on the web.

Simple HTML5 charts using the canvas element.

Configuration and scripts for Create React App.

> - This is the repository for Vue Router 4 (for Vue 3) > - For Vue Router 3 (for Vue 2) see [vuejs/vue-router](https://github.com/vuejs/vue-router).

An ES5 spec-compliant `Array.prototype.map` shim/polyfill/replacement that works as far down as ES3.

Iterate any JS iterator. Works robustly in all environments, all versions.

ES Proposal spec-compliant shim for Promise.allSettled

> webpack loader for Vue Single-File Components

Functional programming in TypeScript

ES Proposal spec-compliant shim for Promise.prototype.finally

ES2017 spec-compliant String.prototype.padStart shim.

Provides polyfills necessary for a full ES2015+ environment

A polyfill for IntersectionObserver

state management for Vue.js

Dynamic script loading for browser

Polyfill for :focus-visible pseudo-selector

Smooth Scroll behavior polyfill

a simple polyfill for javascript URLSearchParams

Polyfill/shim for `document.contains`

Browser console polyfill. Makes it safe to do console.log()-s etc always.

lil' event emitter

Event manager.

YouTube IFrame Player API abstraction.

measures element size

Cross-browser JavaScript shim that fully implements element.classList (referenced on MDN)

UI utilities

matches/matchesSelector helper

the brains and guts of a layout library

Cascading grid layout library

Return the closest element matching a selector up the DOM tree

Polyfill object-fit and object-position on images on IE9, IE10, IE11, Edge, Safari, ...

Glide.js is a dependency-free JavaScript ES6 slider and carousel. It’s lightweight, flexible and fast. Designed to slide. No less, no more

Use external SVG spritemaps in any browser

A responsive image polyfill.

matchMedia polyfill for testing media queries in JS

Polyfill for CSS `position: sticky`

MDN polyfills

Give your page some headroom. Hide your header until you need it