import { ComboboxItem } from './Combobox.types';
export interface ComboboxNullOption {
    value: "";
    label: unknown;
    disabled: false;
    __null: true;
}
export declare function buildComboboxId(id: string | undefined, generatedId: string): string;
export declare function buildComboboxListId(generatedId: string): string;
export declare function buildComboboxClassName({ open, disabled, className, }: {
    open: boolean;
    disabled?: boolean;
    className?: string | null;
}): string;
export declare function filterComboboxItems(items: ComboboxItem[], query: string): ComboboxItem[];
export declare function createVisibleItems(filteredItems: ComboboxItem[], allowNull: boolean, nullLabel: unknown): Array<ComboboxItem | ComboboxNullOption>;
export declare function clampActiveIndex(current: number, length: number): number;
export declare function toComboboxStateLabel({ selected, allowNull, }: {
    selected: string | null;
    allowNull: boolean;
}): string;