/**
 * Checks if `test` is string.
 *
 * @param {*} test The value to check.
 * @returns {boolean} Returns `true` if `value` is string, else `false`.
 * @example
 *
 *      isString('test');             //=> true
 *      isString(new String('test')); //=> true
 *      isString(null);               //=> false
 */
export declare const isString: (test: any) => test is string;
export default isString;