| import { RefObject, useEffect, useState } from 'react' | |
| import { useIsomorphicLayoutEffect } from './use-isomorphic-layout-effect' | |
| export function useMutationObserver( | |
| node: RefObject<HTMLElement>, | |
| callback: MutationCallback, | |
| options: MutationObserverInit | |
| ) { | |
| const [mutationObserver] = useState(() => new MutationObserver(callback)) | |
| useIsomorphicLayoutEffect(() => { | |
| // Discard mutations caused during render phase. This works due to react calling | |
| // useLayoutEffect synchronously after the render phase before the next tick. | |
| mutationObserver.takeRecords() | |
| }) | |
| useEffect(() => { | |
| if (!node.current) { | |
| throw new Error('Failed to attach MutationObserver, `node` is undefined') | |
| } | |
| mutationObserver.observe(node.current, options) | |
| return () => mutationObserver.disconnect() | |
| }, [mutationObserver, node, options]) | |
| } | |