import { MongoConnection } from '../MongoConnection';
export interface MapFunction {
    (): void;
}
export interface ReduceFunction<ITEM, RESULT> {
    (total: RESULT, list: Array<ITEM>): RESULT;
}
export declare function mapReduce<ITEM, RESULT>(client: MongoConnection, db: string, collection: string, map: MapFunction, reduce: ReduceFunction<ITEM, RESULT>, filter?: any, options?: any): Promise<Array<any>>;