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

Reactive primitives for observing resizing of HTML elements.

Detect if web fonts are available

An Implementation of ES Observables

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

Define a lazily evaluated property on an object

This plugin transforms checks for a private property in an object

A polyfill for the Resize Observer API

Allow parsing of '#foo in obj' brand checks

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

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

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

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

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

Resize observer for React

React MutateObserver Component

Symbol.observable ponyfill

Delete nested properties from an object using dot notation.

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