/**
 * Invokes `callback` when focus moves outside the given element's DOM
 * subtree.
 *
 * Returns a function that can optionally be called to remove the
 * event listener.
 */
export declare const onFocusOutsideOf: (container: any, callback: any) => () => void;
/**
 * Utility function which returns whether a given DOM element
 * has another DOM element as a descendant.
 */
export declare const isDescendantOf: (ancestor: Element, potentialDescendant: Element) => boolean;
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