import type { DeleteResult, Document, InsertOneResult, Collection as MongoCollection, UpdateResult } from "mongodb";
import pg from "pg";
import type { App, Config } from "../main.js";
import Datastore from "./datastore-abstract.js";
import type { OutputOptions } from "./datastore.js";
import PostgresClient from "./postgres-client.js";
import type { QueryStage } from "./query-stage.js";
export type PostgresConfig = Config["datastore_postgres"];
export default class PostgresDatastore extends Datastore {
    client: PostgresClient;
    start(): Promise<void>;
    stop(): Promise<void>;
    getClient(): PostgresClient;
    find(collection_name: string, query: Record<string, unknown>, options: Parameters<MongoCollection["find"]>[1], output_options: OutputOptions): Promise<Record<string, unknown>[]>;
    aggregate(collection_name: string, pipeline: QueryStage[], _: unknown, output_options: OutputOptions): Promise<Record<string, unknown>[]>;
    insert(collection_name: string, to_insert: Record<string, unknown>, options?: Parameters<MongoCollection["insertOne"]>[1]): Promise<InsertOneResult<Document>>;
    update(collection_name: string, query: unknown, new_value: unknown): Promise<UpdateResult<Document>>;
    remove(collection_name: string, query: unknown, just_one: boolean): Promise<DeleteResult>;
    private postStart;
    /**
     * Method is meant for testing when you need to execute single quick query
     * to check state of the database or clean database afetr
     * @param config config to connect to postgress (database name will be skipped)
     * @param query SQL formatted string
     */
    static executePlainQuery(app: App, config: PostgresConfig, query: string): Promise<pg.QueryResult<any>>;
    private checkForDatabase;
}