export declare const VIRTUAL_MIN_VIEWPORT = 120;
export declare const VIRTUAL_DEFAULT_VIEWPORT = 340;
/**
 * Base viewport height for virtualized menus/lists.
 * Ensures a reasonable minimum height even when maxHeight is small.
 */
export declare const getBaseVirtualViewportHeight: (maxHeight?: number) => number;
/**
 * Adjusted viewport height when some vertical space is reserved
 * (e.g. search header, footer). Always enforces a minimum.
 */
export declare const getAdjustedVirtualViewportHeight: (maxHeight: number | undefined, reserved: number) => number;