import { Pool, PoolConfig } from "pg";
import { SessionStore } from "./types";
interface NewPoolOpts {
    host?: string | undefined;
    port?: number | undefined;
    database?: string | undefined;
    user?: string | undefined;
    password?: string | (() => string | Promise<string>) | undefined;
    /**
     * Postgres Pool config.
     *
     * Remember to install the db driver `'pg'`.
     *
     * @see {@link https://node-postgres.com/apis/pool node-postgres | Pool Options}
     * */
    config?: Omit<PoolConfig, "host" | "port" | "database" | "user" | "password">;
    /** Table name to use for sessions. Defaults to "telegraf-sessions". */
    table?: string;
    /** Called on fatal connection or setup errors */
    onInitError?: (err: unknown) => void;
}
interface ExistingPoolOpts {
    /** If passed, we'll reuse this instance of pg Pool instead of creating our own. */
    pool: Pool;
    /** Table name to use for sessions. Defaults to "telegraf-sessions". */
    table?: string;
    /** Called on fatal connection or setup errors */
    onInitError?: (err: unknown) => void;
}
/** @unstable */
export declare function Postgres<Session>(opts: NewPoolOpts): SessionStore<Session>;
export declare function Postgres<Session>(opts: ExistingPoolOpts): SessionStore<Session>;
export {};