import { ClientBase, Pool, PoolClient } from 'pg';
import { IsolationLevel, TxnClient } from 'zapatos/db';
export type DbClient = Pool | TxnClient<IsolationLevel>;
/**
 * Iterates through pgSettings properties, composes and runs a single SELECT
 * query to execute set_config for each property.
 */
export declare const setPgSettingsConfig: (pgSettings: {
    [key: string]: string;
} | undefined, txn: Pool | TxnClient<IsolationLevel> | PoolClient | ClientBase) => Promise<void>;
/**
 * Creates a transaction and sets pg settings before executing queries.
 * The applied pgSettings are added to the field "_debugPgSettings" in the transaction object for debug purposes.
 * @param pool - DB pool instance or PG/Zapatos client.
 * @param isolationLevel - Transaction isolation level.
 * @param pgSettings - Settings to be set before queries are executed.
 * @param callback - Callback where queries are executed.
 */
export declare const transactionWithContext: <T>(pool: DbClient, isolationLevel: IsolationLevel, pgSettings: {
    [key: string]: string;
} | undefined, callback: (client: TxnClient<IsolationLevel>) => Promise<T>) => Promise<T>;
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