A javascript text diff implementation.

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

Brand checking of React Elements.

babel's modular runtime helpers

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

string representations of objects in node and the browser

Standard library

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

ECMAScript spec abstract operations.

Object.prototype.hasOwnProperty.call shortcut

Implementation of Function.prototype.bind

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

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

Robustly `.call.bind()` a function

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

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

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

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

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

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

ES2017 spec-compliant Object.values shim.

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

Runtime type checking for React props and similar objects.

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

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

A simple utility for conditionally joining classNames together

ECMAScript extensions and shims

Parse and display moments in any timezone.

traverse and transform objects by visiting every node on a recursive walk

Lodash exported as ES modules.

Custom React PropType validators that we use at Airbnb.

Modern copy to clipboard. No Flash. Just 2kb

Manage multiple event handlers using few event listeners

An enterprise-class UI design language and React components implementation

A React component for dealing with clicks outside its subtree

Polyfill/shim for `document.contains`

A responsive and accessible date range picker component built with React

React proptype for moment module

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Components to provide and consume RTL or LTR direction in React

Interface for react-with-styles outputting CSS

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

scroll dom node into view automatically

Calculate line-height of an HTML element (IE6 compatible)

Cross-browser currentStyle/getComputedStyle implementation

Unabashedly-barebones memoization library with an aim toward speed