import { GridStatusBarAggregates } from '../models';
export type AggregateFunction = 'sum' | 'avg' | 'count' | 'min' | 'max';
/** Compute a single aggregate across a numeric field */
export declare function computeAggregate<T extends Record<string, unknown>>(data: T[], field: string, fn: AggregateFunction): number | string;
/** Compute all aggregates for a set of values (for status bar) */
export declare function computeStatusBarAggregates(values: unknown[]): GridStatusBarAggregates;
/** Compute group-level aggregates for all aggregatable columns */
export declare function computeGroupAggregates<T extends Record<string, unknown>>(items: T[], aggregateDefs: {
    field: string;
    fn: AggregateFunction;
}[]): Record<string, number | string>;
/** Format aggregate value for display (respects locale) */
export declare function formatAggregateValue(value: number | string, fn: AggregateFunction): string;