import { type ReactNode } from 'react';
import type { FilterFieldSuggestion, FlattenedSuggestionItem, GroupMetadata } from '../../suggestions/Suggestion.types.js';
import type { FilterFieldSuggestionGroup } from '../../suggestions/SuggestionGroup.types.js';
/**
 * Flattens a suggestions array so that every suggestion — whether standalone or inside a group — becomes its own entry.
 * Group labels are emitted as separate `group-header` items.
 * Empty groups are omitted entirely.
 * The original array can contain:
 * - Data objects of type FilterFieldSuggestion and FilterFieldSuggestionGroup
 * - FilterField.SuggestionGroup and FilterField.SuggestionGroupLabel elements
 * @internal
 */
export declare function flattenSuggestions(items: (ReactNode | FilterFieldSuggestion | FilterFieldSuggestionGroup)[]): {
    flattenedSuggestionItems: FlattenedSuggestionItem[];
    groupMetadata: GroupMetadata[];
};