React is a JavaScript library for building user interfaces.

ECMAScript extensions and shims

RFC4122 (v1, v4, and v5) UUIDs

Array#isArray for older browsers

Brand checking of React Elements.

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

babel's modular runtime helpers

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

Implementation of Function.prototype.bind

Express style path to RegExp utility

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.

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

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.

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

A better forEach

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

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.

ES5 spec-compliant shim for String.prototype.trim

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.

Runtime type checking for React props and similar objects.

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

ES proposal-spec-compliant Object.fromEntries shim.

ES2017 spec-compliant Object.entries shim.

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

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.

Copies non-react specific statics from a child component to a parent component

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

A window.fetch polyfill.

tiny modular DOM lib for ie9+

A tiny invariant function

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

Utilities for all Sentry JavaScript SDKs

Declarative routing for React

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

Lodash exported as ES modules.

Declarative routing for React web applications

A mirror of Facebook's Warning

implementation of crypto for the browser

babel selfContained runtime

Manage session history with JavaScript

requestAnimationFrame polyfill for node and the browser

Tiny 200b functional Event Emitter / pubsub.

ES2017 spec-compliant String.prototype.padEnd shim.

Resolve URL pathnames using JavaScript

Are these two JavaScript values equal?

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

React Hook Form validation resolvers: Yup, Joi, Superstruct, Zod, Vest, Class Validator, io-ts, Nope, computed-types, TypeBox, arktype and Typanion

Build forms in React, without the tears

A lib for generating Style Sheets with JavaScript.

fast string hashing function

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

ES2017 spec-compliant String.prototype.padStart shim.

React notification made easy

Legacy API for creating React components.

Beautiful and accessible drag and drop for lists with React

A polyfill for IntersectionObserver

Custom React PropType validators that we use at Airbnb.

Manage multiple event handlers using few event listeners

Test if you can use dom in the current environment

Polyfill for :focus-visible pseudo-selector

Tiny data broadcaster with 0 dependencies

Smooth Scroll behavior polyfill

Polyfill/shim for `document.contains`

Components to provide and consume RTL or LTR direction in React

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A responsive and accessible date range picker component built with React

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

React Native for Web

Sometimes you have to do horrible things, like use the global object to share a singleton. Abstract that away, with this!

Blazing fast modern site generator for React

An enhanced Link component for Gatsby sites with support for resource prefetching

React Router scroll management forked from https://github.com/ytase/react-router-scroll for Gatsby

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

Stand alone shallowCompare for use in libraries that support shouldComponentUpdate

modern domready

Return the closest element matching a selector up the DOM tree

Give your JavaScript the ability to speak many languages.

Pluggable browser scroll management

Framework-agnostic CSS-in-JS with support for server-side rendering, browser prefixing, and minimum CSS generation

matchMedia polyfill for testing media queries in JS

Gatsby plugin to add google analytics onto a site

A variant of sweetalert for use with React and Bootstrap