import { Knex } from 'knex';
/**
 * Interface for SSH Tunnel options
 */
export interface TunnelSSHOptions {
    privateKey: string;
    passphrase?: string;
    username: string;
    host: string;
    port: number;
    localhost?: string;
}
/**
 * Interface for additional knex connection config
 */
export interface KnexInstanceOptions {
    host?: string;
    user?: string;
    password?: string;
    database?: string;
    tunnel?: boolean | TunnelSSHOptions;
    knexConfig?: Partial<Knex.Config>;
    knexConnection?: Partial<Knex.MySqlConnectionConfig>;
}
/**
 * Interface for extends knex object
 */
export interface RefDblDB {
    current: Knex<any, any[]>;
}
/**
 * Generate knex instance with optional SSH tunneling
 * @param host DB Host
 * @param user DB User
 * @param password DB Password
 * @param database DB Name
 * @param conf Additional config including tunnel, knexConfig and connection
 * @returns Object with `.current` knex instance or false
 */
declare function knexInstances({ host, user, password, database, ...conf }?: KnexInstanceOptions): Promise<RefDblDB | false>;
export default knexInstances;