import * as postgres from 'postgres';
/** Postgres client instance */
export type PgSqlClient = postgres.Sql<any> | postgres.TransactionSql<any>;
/** Postgres pending query or query fragment */
export type PgSqlQuery = postgres.PendingQuery<postgres.Row[]>;
export type PgSslMode = 'require' | 'allow' | 'prefer' | 'verify-full' | boolean | object;
/** Postgres connection URI string */
export type PgConnectionUri = string;
/** Postgres connection values */
export type PgConnectionVars = {
    database?: string;
    user?: string;
    password?: string;
    host?: string;
    port?: number;
    schema?: string;
    ssl?: PgSslMode;
    application_name?: string;
};
/** Postgres connection arguments */
export type PgConnectionArgs = PgConnectionUri | PgConnectionVars;
/** Postgres connection options */
export type PgConnectionOptions = {
    /** Time to wait before automatically closing an idle connection (s) */
    idleTimeout?: number;
    /** Maximum allowed duration of any statement (ms) */
    statementTimeout?: number;
    /** Maximum time a connection can exist (s) */
    maxLifetime?: number;
    /** Max number of connections */
    poolMax?: number;
};
/**
 * Takes in connection arguments provided via an object or a connection string and returns them with
 * a standardized application name format. If no connection args are provided, they are built from
 * standard postgres ENV vars.
 * @param args - Connection arguments
 * @param usage - Usage string
 * @returns PgConnectionVars
 */
export declare function standardizedConnectionArgs(args?: PgConnectionArgs, usage?: string): PgConnectionArgs;
/**
 * Connects to Postgres. This function will also test the connection first to make sure all
 * connection parameters were specified correctly.
 * @param args - Connection options
 * @returns configured `Pool` object
 */
export declare function connectPostgres({ usageName, connectionArgs, connectionConfig, }: {
    usageName: string;
    connectionArgs?: PgConnectionArgs;
    connectionConfig?: PgConnectionOptions;
}): Promise<PgSqlClient>;
/**
 * Creates a Postgres client based on the provided connection arguments.
 * @param args - Connection options
 * @returns PgSqlClient
 */
export declare function getPostgres({ usageName, connectionArgs, connectionConfig, }: {
    usageName: string;
    connectionArgs?: PgConnectionArgs;
    connectionConfig?: PgConnectionOptions;
}): PgSqlClient;