export declare const getAt: <T>(array: readonly T[], index: number) => T | undefined;
export declare const getFirst: <T>(array: readonly T[]) => T | undefined;
export declare const getLast: <T>(array: readonly T[]) => T | undefined;
export declare const getChildElement: (parent: Element | null, index: number) => HTMLElement | null;
type NavigableItemLike = {
    separator?: boolean;
    disabled?: boolean;
};
export declare const getFirstEnabledIndex: <T extends NavigableItemLike>(items: readonly T[]) => number;
export declare const getLastEnabledIndex: <T extends NavigableItemLike>(items: readonly T[]) => number;
export declare const getNextEnabledIndex: <T extends NavigableItemLike>(items: readonly T[], startIndex: number, delta: number) => number;
export declare const isRootContainer: (container?: HTMLElement) => boolean;
export declare const getCollisionBoundary: (container?: HTMLElement) => HTMLElement;
export declare const getBoundedHorizontalPosition: (left: number, menuElement: HTMLElement, boundary: HTMLElement) => number;
export declare const getBoundedVerticalPosition: (top: number, menuElement: HTMLElement, boundary: HTMLElement) => number;
export declare const getContainerPosition: (x: number, y: number, container?: HTMLElement) => {
    x: number;
    y: number;
};
export {};