import { AggregatedItemGroup, AggregateItem, AggregationMode } from '../cluster/models/aggregation.models';
import { Config } from '../dimension/models/config.models';
import { ViewRequirements } from './models/view-requirements.models';
/**
 * Groups coloured fact sheets by their view index (colour bucket) for rollup display.
 * Each group corresponds to one legend entry and contains all items assigned to that colour.
 * Currently only `{ type: 'rollup' }` aggregation is implemented.
 *
 * @param items - Fact sheets paired with their cluster membership (used to apply view-per-cluster logic)
 * @param config - Configuration with `clustering` and `view` settings
 * @param viewRequirements - Legend and aggregation from {@link computeLegendAndViewAggregation}
 * @param aggregationMode - The grouping strategy; only `{ type: 'rollup' }` is supported
 * @returns One `AggregatedItemGroup` per legend entry, each containing its matched items
 */
export declare function aggregateItems(items: AggregateItem[], config: Config, viewRequirements: ViewRequirements, aggregationMode: AggregationMode): AggregatedItemGroup[];