import type { GridRowId, GridRowMeta } from '../types';
import type { Collection } from './types';
export declare function flatten(collection: Collection, expanded: Set<GridRowId>, sortFn: null | ((ids: GridRowId[], entities: Map<GridRowId, any>, meta: Map<GridRowId, GridRowMeta>) => GridRowId[]), matchedIds?: Set<GridRowId> | null): {
    ids: GridRowId[];
    indexes: Map<GridRowId, number>;
    setDetails: Map<GridRowId, {
        setSize: number;
        posInset: number;
    }>;
};
export declare function precalculateCollections(collection: Collection): {
    rowCount: number;
    levels: Map<GridRowId, number>;
};
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