useResizeObserver

See source on Github 

Registers a ResizeObserver on ref and executes callback when the observed element is resized.

• @param ref - A RefObject of the element to observe.
• @param callback - A function to execute when the observed element is resized.
• @param options - Configurable options
• @returns void

Example

const ref = useRef<HTMLElement>(null);
const [size, setSize] = useState({ width: 0, height: 0 });
 
useResizeObserver(ref, (entry) => setSize({
  width: entry.contentRect.width,
  height: entry.contentRect.height,
}));