/**
 * calc max length of strs.
 * @param strs
 * @returns {number}
 * @private
 */
export declare function maxLength(strs: string[]): number;
/**
 * padding string with pad.
 * @param str
 * @param length
 * @param pad
 * @returns {string}
 * @private
 */
export declare function pad(str: string, length: number, pad?: string): string;
/**
 * convert foo-bar to fooBar.
 * @param str
 * @returns {string}
 * @private
 */
export declare function kebabToLowerCamelCase(str: string): string;