export declare const isLeaf: (el: any) => boolean;
export declare const getSibling: (el: any, distance: any) => any;
export declare const getMenuIndex: (el: any) => number;
export declare const focusNode: (el: any) => void;
export declare const checkNode: (el: any) => void;
export declare const sortByOriginalOrder: (oldNodes: any, newNodes: any) => any;
export declare const PANEL_INJECTION_KEY: unique symbol;