import { Logger as PgMigrateLogger, MigrationDirection } from 'node-pg-migrate/dist/types';
import { PgConnectionArgs } from './connection';
export interface MigrationOptions {
    /** Bypass the NODE_ENV check when performing a "down" migration which irreversibly drops data. */
    dangerousAllowDataLoss?: boolean;
    /** Log all applied migrations */
    logMigrations?: boolean;
    /** Name of the table used for migrations. Defaults to `pgmigrations`. */
    migrationsTable?: string;
    /** Custom logging configuration */
    logger?: PgMigrateLogger;
}
/**
 * Run migrations in one direction.
 * @param dir - Migrations directory
 * @param direction - Migration direction (`'down'` or `'up'`)
 * @param connectionArgs - Postgres connection args
 * @param opts - Migration options
 */
export declare function runMigrations(dir: string, direction: MigrationDirection, connectionArgs?: PgConnectionArgs, opts?: MigrationOptions): Promise<void>;
/**
 * Cycle migrations down and up.
 * @param dir - Migrations directory
 * @param connectionArgs - Postgres connection args
 * @param opts - Migration options
 */
export declare function cycleMigrations(dir: string, connectionArgs?: PgConnectionArgs, opts?: MigrationOptions & {
    /** Validates if the database was cleared completely after all `down` migrations are done */
    checkForEmptyData?: boolean;
}): Promise<void>;
/**
 * Check the `pg_class` table for any data structures contained in the database. We will consider
 * any and all results here as "data" contained in the DB, since anything that is not a completely
 * empty DB could lead to strange errors when running the API. See:
 * https://www.postgresql.org/docs/current/catalog-pg-class.html
 * @returns `boolean` if the DB has data
 */
export declare function databaseHasData(connectionArgs?: PgConnectionArgs, opts?: {
    ignoreMigrationTables?: boolean;
    migrationsTable?: string;
}): Promise<boolean>;
/**
 * Drops all tables from the Postgres DB. DANGEROUS!!!
 */
export declare function dangerousDropAllTables(connectionArgs?: PgConnectionArgs, opts?: {
    acknowledgePotentialCatastrophicConsequences?: 'yes';
}): Promise<void>;