/**
 * Returns a CSS `min()` expression that caps dropdown height to the smaller of:
 * - the available viewport space (`availableHeight`)
 * - a configurable number of items (via `--bm-combobox-dropdown-max-items`, default 8)
 *
 * Consumers can set `--bm-combobox-dropdown-max-items` on an ancestor element to override.
 */
export declare const getDropdownMaxHeight: (availableHeight: number) => string;