/**
 * checks if an element is visible with `Element.checkVisibility`
 * @param  {HTMLElement} elem    element to check
 * @param  {object}      params  the options of `Element.checkVisibility`
 * @return {Boolean|null}        the visibility, or `null` when the browser has no `checkVisibility`
 */
export default function checkVisibility(elem: HTMLElement, params: CheckVisibilityOptions): boolean | null;
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