@sanity/ui/src/core/hooks/useElementSize.ts

The Sanity UI components.

import {useEffect, useState} from 'react'

import {_elementSizeObserver, ElementSize} from '../observers/elementSizeObserver'

/**
 * Subscribe to the size of a DOM element.
 * @beta
 */
export function useElementSize(element: HTMLElement | null): ElementSize | null {
  const [size, setSize] = useState<ElementSize | null>(null)

  useEffect(() => {
    if (!element) return undefined

    return _elementSizeObserver.subscribe(element, setSize)
  }, [element])

  return size
}