import { Ref } from './ref';
import { AggregationBuilder } from './aggregation';
export declare const min: (ref: Ref) => AggregationBuilder;
export declare const max: (ref: Ref) => AggregationBuilder;
export declare const sum: (ref: Ref) => AggregationBuilder;
export declare const avg: (ref: Ref) => AggregationBuilder;