jellyfin-web/src/hooks/useElementSize.ts

import { MutableRefObject, useLayoutEffect, useRef, useState } from 'react';
import useResizeObserver from '@react-hook/resize-observer';

interface Size {
    width: number;
    height: number;
}

export default function useElementSize<
    T extends HTMLElement = HTMLDivElement
>(): [MutableRefObject<T | null>, Size] {
    const target = useRef<T | null>(null);
    const [size, setSize] = useState<Size>({
        width: 0,
        height: 0
    });

    useLayoutEffect(() => {
        target.current && setSize(target.current.getBoundingClientRect());
    }, [target]);

    useResizeObserver(target, (entry) => setSize(entry.contentRect));

    return [target, size];
}