/**
 * SPDX-FileCopyrightText: © 2019 Liferay, Inc. <https://liferay.com>
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * Utility function for substituting variables into language keys.
 */
export declare const sub: (langKey: string, args: Array<React.ReactText>) => string;