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Tooltip and Popover Positioning Engine

There is a newer version: 2.11.8

// @flow
import getComputedStyle from './getComputedStyle';

export default function isScrollParent(element: HTMLElement): boolean {
  // Firefox wants us to check `-x` and `-y` variations as well
  const { overflow, overflowX, overflowY } = getComputedStyle(element);
  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);
}