/**
 * Is the given argument of type String
 *
 * @param x - Argument to test
 *
 * @returns Whether the argument is a string or not
 *
 * @example
 * ```ts
 * isString('string'); // --> true
 * isString(123); // --> false
 * ```
 */
export declare const isString: (x: unknown) => x is string;
export default isString;