interface CreateFocusableTreeWalkerOptions { acceptElement?: (element: HTMLElement) => boolean; } declare function createFocusableTreeWalker(root: HTMLElement, { acceptElement }?: CreateFocusableTreeWalkerOptions): TreeWalker; interface IsFocusableElementOptions { rootElement?: HTMLElement; } declare function isFocusableElement(element: HTMLElement, { rootElement }?: IsFocusableElementOptions): any; export { type CreateFocusableTreeWalkerOptions, type IsFocusableElementOptions, createFocusableTreeWalker, isFocusableElement };