/**
 * Checks if input value is a string
 * @param {any} str String value
 * @returns {boolean}
 */
export function isString(str: any): boolean;
/**
 * Safely trims string
 * @param {string} str String
 */
export function trim(str: string): string;
/**
 * Checks if given route is valid
 * @private
 * @param {string} route Route string
 */
export function isValidRoute(route: string): boolean;