export declare enum AggregationTypes {
    COUNT = "count",
    AVG = "avg",
    MIN = "min",
    MAX = "max",
    SUM = "sum"
}
type AggregationFunction = (values: number[] | Record<string, unknown>[], keys?: string | string[], joinOperation?: AggregationTypes) => number;
type AggregationFunctions = Record<AggregationTypes, AggregationFunction>;
/**
 * 聚合函数
 * @example
 * const values = [{ m: 1 }, { m: 2 }, { m: 3 }, { m: 4 }, { m: 5 }];
 * const avgFn = aggregationFunctions[AggregationTypes.AVG];
 * console.log(avgFn(values, "m")); // 3
 */
export declare const aggregationFunctions: AggregationFunctions;
export {};