@base-ui-components/react/esm/utils/getCssDimensions.js

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

import { round } from '@floating-ui/utils';
import { getComputedStyle, isHTMLElement } from '@floating-ui/utils/dom';
export function getCssDimensions(element) {
  const css = getComputedStyle(element);
  // In testing environments, the `width` and `height` properties are empty
  // strings for SVG elements, returning NaN. Fallback to `0` in this case.
  let width = parseFloat(css.width) || 0;
  let height = parseFloat(css.height) || 0;
  const hasOffset = isHTMLElement(element);
  const offsetWidth = hasOffset ? element.offsetWidth : width;
  const offsetHeight = hasOffset ? element.offsetHeight : height;
  const shouldFallback = round(width) !== offsetWidth || round(height) !== offsetHeight;
  if (shouldFallback) {
    width = offsetWidth;
    height = offsetHeight;
  }
  return {
    width,
    height
  };
}