@material-ui/popper.js/src/utils/isFixed.js

A fork of popper.js to avoid the deprecation warnings: https://github.com/mui-org/material-ui/issues/19358.

import getStyleComputedProperty from './getStyleComputedProperty';
import getParentNode from './getParentNode';

/**
 * Check if the given element is fixed or is inside a fixed parent
 * @method
 * @memberof Popper.Utils
 * @argument {Element} element
 * @argument {Element} customContainer
 * @returns {Boolean} answer to "isFixed?"
 */
export default function isFixed(element) {
  const nodeName = element.nodeName;
  if (nodeName === 'BODY' || nodeName === 'HTML') {
    return false;
  }
  if (getStyleComputedProperty(element, 'position') === 'fixed') {
    return true;
  }
  const parentNode = getParentNode(element);
  if (!parentNode) {
    return false;
  }
  return isFixed(parentNode);
}