import { Calendar } from '../calendar';
export declare const ARROW_UP = "ArrowUp";
export declare const ARROW_RIGHT = "ArrowRight";
export declare const ARROW_DOWN = "ArrowDown";
export declare const ARROW_LEFT = "ArrowLeft";
export type PredefindKeys = typeof ARROW_UP | typeof ARROW_RIGHT | typeof ARROW_DOWN | typeof ARROW_LEFT;
export declare function isCellOrHeader(el: unknown): el is HTMLElement;
export declare function getNextFocusableGridElement(this: Calendar, key: PredefindKeys, activeElement: HTMLElement): Element | null | undefined;
export declare function getHeaderDescendantGridCell(this: Calendar, key: PredefindKeys, activeElement: HTMLElement): Element | null | undefined;