SuperBased Observer — capture, normalize, compress, and analyze AI coding tool activity across Claude Code, Codex, Cursor, Cline/Roo, and Copilot.
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Polyfills the ResizeObserver API and supports box size options from the latest spec
Monitor if a component is inside the viewport, using IntersectionObserver API
Resize observer for React
React MutateObserver Component
A React hook that allows you to use a ResizeObserver to measure an element's size.
Reactive primitives for observing resizing of HTML elements.
A polyfill for the Resize Observer API
Resize observer for React
A React hook for the IntersectionObserver API that uses a polyfill when the native API is not available
A React hook that fires a callback whenever ResizeObserver detects a change to its size
Detect if web fonts are available
🏯 PositionObserver is a JavaScript tool that provides a way to asynchronously observe changes in the position of a target element within its viewport.
Tracks the intersection of a DOM element and its containing element or the viewport.
An implementation and polyfill of the Resize Observer draft.
Observe CSS property changes on any elements
React hook to use IntersectionObserver declaratively.
@vue/reactivity
A React Hooks package for mutation-observer