import type { Pool, PoolClient } from 'pg';
/**
 * Sets up Vitest lifecycle hooks for transactional isolation.
 * - Creates isolated temp env file if TEST_ENV_FILE not set.
 * - Connects a shared pool once.
 * - Opens a fresh transaction before each test and rolls back after.
 * - Optionally seeds the admin core inside each test transaction (idempotent).
 *
 * NOTE: Migrations are expected to be applied externally; this helper only asserts runtime isolation.
 */
export declare function setupDbHooks(options?: {
    seedAdminInEachTest?: boolean;
}): void;
/** Access the active transactional client for the current test. */
export declare function getTestClient(): PoolClient;
/** Access the underlying shared pool. */
export declare function getTestPool(): Pool;