import { Comparator } from '../types';
/**
 *
 *
 * @export
 * @param {string} str
 * @return {*}  {string}
 */
export declare function escapeSpecialChars(str: string): string;
/**
 *
 *
 * @export
 * @param {(string | RegExp)} arg
 * @return {*}  {RegExp}
 */
export declare function toRegExp(arg: string | RegExp): RegExp;
export declare const isAtLeast: Comparator;
export declare const strictEqual: Comparator;