import type { AppliedStorageMigration, SchemaMigrationStorage, StorageMigration, StorageMigrationResult } from "./contract.js";
export interface PostgresQueryExecutor {
    query<T extends Record<string, unknown>>(sql: string, params?: readonly unknown[]): Promise<T[]>;
    execute(sql: string, params?: readonly unknown[]): Promise<void>;
    transaction?<T>(fn: (executor: PostgresQueryExecutor) => Promise<T>): Promise<T>;
    close?(): Promise<void> | void;
}
export declare class PostgresStorage implements SchemaMigrationStorage {
    private readonly executor;
    readonly backend = "postgresql";
    readonly migrations: readonly StorageMigration[];
    constructor(executor: PostgresQueryExecutor, migrations?: readonly StorageMigration[]);
    listAppliedMigrations(): Promise<AppliedStorageMigration[]>;
    migrate(opts?: {
        dryRun?: boolean;
        through?: string;
    }): Promise<StorageMigrationResult>;
    close(): Promise<void>;
    private ensureLedger;
    private readAppliedMigrations;
    private tryReadAppliedMigrations;
    private buildPlan;
}
export declare function createPostgresStorage(executor: PostgresQueryExecutor): PostgresStorage;