import { MongoPipelineFacet, MongoPipelineMatch, MongoPipelineSet } from "./MongoPipelineStages";
import { MongoQueryOperation } from "./MongoQueryOperation";
export declare type MongoQueryPipelineStage = MongoPipelineMatch | MongoPipelineFacet | MongoPipelineSet | MongoQueryOperation;
export declare type MongoQueryPipeline = (MongoQueryPipelineStage | MongoQueryUnion)[];
export declare type MongoQueryUnion = {
    $unionWith: {
        coll: string;
        pipeline: (MongoQueryPipelineStage | {
            $group: any & {
                _id: string;
            };
        })[];
    };
};