import type { Script } from './Script';
import type { Migration } from './Migration';
export declare class PgMigration implements Migration {
    private readonly client;
    constructor(connectionString: string);
    connect(): Promise<void>;
    disconnect(): Promise<void>;
    initializeMetaTable(): Promise<void>;
    fetchAppliedMigrations(): Promise<Script[]>;
    executeSql(sql: string): Promise<void>;
    updateVersion(fileName: string, checksum: string): Promise<void>;
}