A JavaScript text diff implementation.

Brand checking of React Elements.

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

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

Implementation of Function.prototype.bind

JavaScript sprintf implementation

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.

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

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

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

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

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

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

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

ES2017 spec-compliant Object.values shim.

Object.prototype.hasOwnProperty.call shortcut

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

Lodash exported as ES modules.

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

Parse and display moments in any timezone.

Custom React PropType validators that we use at Airbnb.

Manage multiple event handlers using few event listeners

Polyfill/shim for `document.contains`

A React component for dealing with clicks outside its subtree

React proptype for moment module

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

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