import { Grouping } from '../compiler/grouping.js';
import { Context, GroupByCallback, OperatorCallback } from './types.js';
/**
 * Group keys for `query.groupBy(...)` when the query has no aggregate.
 * Aggregates such as `count` bring the grouping compiler themselves.
 */
export interface GroupKeys<TContext extends Context> {
    callback: GroupByCallback<TContext>;
    grouping: Grouping;
}
export declare function groupKeys<TContext extends Context = any>(callback: OperatorCallback<TContext, GroupByCallback<TContext>>): GroupKeys<TContext>;