import type { GridFeatureModule, GridHost } from 'apex-grid/internal';
import type { ReactiveController } from 'lit';
/** Supported aggregation functions. */
export type AggregationFn = 'sum' | 'avg' | 'min' | 'max' | 'count';
/** Per-column aggregation request, keyed by column key. */
export type AggregationConfig = Record<string, AggregationFn[]>;
/** Computed aggregation values, keyed by column key then function. */
export type AggregationResults = Record<string, Partial<Record<AggregationFn, number>>>;
export declare const AGGREGATION_MODULE_ID = "aggregation";
/**
 * Compute the requested aggregations for a set of rows. Pure and reusable —
 * shared by the {@link AggregationController} and the row-grouping feature,
 * which calls it per group over the (filtered) leaf rows.
 */
export declare function computeAggregations<T extends object>(data: readonly T[], config: AggregationConfig): AggregationResults;
/**
 * Enterprise feature: computes column aggregations (sum/avg/min/max/count) over
 * a dataset. Implemented as a {@link GridFeatureModule} controller so it is
 * wired through the core extension seam and only ships in the enterprise grid.
 */
export declare class AggregationController<T extends object> implements ReactiveController {
    constructor(host: GridHost<T>);
    hostConnected(): void;
    /** Compute the requested aggregations for the given rows. */
    compute(data: readonly T[], config: AggregationConfig): AggregationResults;
}
/** Feature module registered on the enterprise grid. */
export declare const aggregationModule: GridFeatureModule;