Reactive primitives for observing resizing of HTML elements.

An Implementation of ES Observables

A cross-browser object property observer uses ES6 proxy underneath and with fallback on dirty-checking

Detect if web fonts are available

`Object.defineProperty`, but not IE 8's broken one.

Define a lazily evaluated property on an object

A polyfill for the Resize Observer API

A React hook for the IntersectionObserver API that uses a polyfill when the native API is not available

Polyfills the ResizeObserver API and supports box size options from the latest spec

Allow parsing of '#foo in obj' brand checks

This plugin transforms checks for a private property in an object

Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.

Monitor if a component is inside the viewport, using IntersectionObserver API

Resize observer for React

Define a data property on an object. Will fall back to assignment in an engine without descriptors.

React MutateObserver Component

Symbol.observable ponyfill

Delete nested properties from an object using dot notation.

Returns an array of all enumerable symbol properties found directly upon a given object

A React hook that allows you to use a ResizeObserver to measure an element's size.