Brand checking of React Elements.

Browser-friendly inheritance fully compatible with standard node.js inherits()

Runtime for Regenerator-compiled generator and async functions.

babel's modular runtime helpers

Express style path to RegExp utility

Implementation of Function.prototype.bind

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

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

Robustly `.call.bind()` a function

ES2015 `Object.assign()` ponyfill

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

ECMAScript spec abstract operations.

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

Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.

A tiny (116 bytes), secure URL-friendly unique string ID generator

Standard library

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

A library for deep (recursive) merging of Javascript objects

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

Node.js's util module for all engines

Object.prototype.hasOwnProperty.call shortcut

Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Returns an array of Typed Array names that are available in the current environment

A better forEach

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

Cooperative scheduler for the browser environment.

Runtime type checking for React props and similar objects.

React is a JavaScript library for building user interfaces.

React package for working with the DOM.

emotion's memoize utility

ES2015-compliant shim for Object.is - differentiates between -0 and +0

Determine if a function is a native generator function.

High-priority task queue for Node.js and browsers

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

An object of css properties that don't accept values with units

A MurmurHash2 implementation

Bare bones Promises/A+ implementation

internal utils for emotion

serialization utils for emotion

emotion's cache

The assert module from Node.js, for the browser.

emotion's stylesheet

A memoization library which only remembers the latest invocation

A Light–weight CSS Preprocessor

A window.fetch polyfill.

Declarative routing for React

Declarative routing for React web applications

A tiny invariant function

ECMAScript extensions and shims

Floating UI for the web

Positioning library for floating elements: tooltips, popovers, dropdowns, and more

Manage session history with JavaScript

A simple, lightweight JavaScript API for handling cookies

> Simple styling in React.

A Select control built with and for ReactJS

Minimal lightweight logging for JavaScript, adding reliable log level methods to any available console.log methods

Resolve URL pathnames using JavaScript

Are these two JavaScript values equal?

A React helper hook for scheduling a layout effect with a fallback to a regular effect for environments where layout effects should not be used (such as server-side rendering).

Check if something is a promise

ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

i18next internationalization framework

Smaller Polyfill for the proposed React context API

Polyfills for various browsers including commonly used language features

Configuration and scripts for Create React App.

ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill

Internationalization for react done right. Using the i18next i18n ecosystem.

i18next-http-backend is a backend layer for i18next using in Node.js, in the browser and for Deno.

Declarative tracking for React apps.