/**
 * Internal implementation of sprintf.
 * @private
 */
export declare function sprintfFormat(parseTree: string | any[], argv: any[]): string;
/**
 * Creates an AST of fmt.
 *
 * @param {String} fmt - The target string.
 * @returns {Array} An AST of fmt.
 * @private
 */
export declare function sprintfParse(fmt: string): any;