/// <reference types="@types/bunyan" />
import { DatabaseStorageFacade, DatabaseStorageFacadeOptions } from '../types';
import bunyan = require('bunyan');
import { WriteOpsResults } from '../types/CollectionFacade';
import { Pool } from 'pg';
export declare class SQLDatabaseStorage implements DatabaseStorageFacade<Pool> {
    protected _db: Pool | null;
    protected _log: bunyan;
    protected _loglevel: DatabaseStorageFacadeOptions['logLevel'];
    protected _connectionUrl: string | undefined;
    constructor(options?: DatabaseStorageFacadeOptions);
    connect(hostname?: string, username?: string, password?: string, database?: string, port?: string): Promise<Pool>;
    closeConnection(): Promise<void>;
    query(query: string, params?: string[] | number[] | boolean[]): Promise<WriteOpsResults<{}>>;
}
export default SQLDatabaseStorage;