React useMeasure Hook Simplifies DOM Element Sizing via ResizeObserver

A new React hook called useMeasure, available from the @reactuses/core library, wraps the browser's ResizeObserver API into a single reusable line of code. Developers pass a ref to the hook and receive a live rect object that updates automatically whenever the target element changes size, whether due to window resizes, flexbox reflows, font swaps, or content changes. The hook handles observer setup and cleanup internally, disconnecting automatically on component unmount and eliminating common pitfalls like stale closures and manual disconnect calls. An optional stop function lets developers halt observations after capturing a one-time measurement, useful for entry animations or initial layout calculations. One key caveat noted is that the returned rect coordinates are relative to the element's own content box, not the viewport, so developers needing on-screen position data should use getBoundingClientRect instead.