export type TriangleData = {
    itemRect: DOMRect;
    parentElementWidth: number;
    subNavigationHeight: number;
    padding: number;
    outsideVX: 'left' | 'right' | undefined;
    outsideVY: 'top' | 'bottom' | undefined;
};
export declare const isEventTargetNavigationItem: (event: unknown) => boolean;
export declare class NavigationItemSafeTriangle {
    private readonly element;
    private readonly subNavigation;
    private readonly parentSubNavigation;
    private triangleData?;
    private initialized;
    private mouseX;
    private mouseY;
    constructor(element: HTMLElement | null, subNavigation: Element | null);
    private init;
    enableFollow(): void;
    disableFollow(): void;
    private getTriangleTipX;
    private getTriangleTipY;
    private hasMouseEnteredSubNavigation;
    private getTriangleCoordinates;
    followByMouseEvent(event: MouseEvent): void;
}
declare const _default: {
    isEventTargetNavigationItem: (event: unknown) => boolean;
    NavigationItemSafeTriangle: typeof NavigationItemSafeTriangle;
};
export default _default;