import { Predicate } from './Predicate.js';
/**
 * @desc Ensures that the `value` is a  {@link String}.
 *
 * @example
 * import { ensure, isString, TinyType } from 'tiny-types';
 *
 * class FirstName extends TinyType {
 *     constructor(public readonly value: string) {
 *         ensure('FirstName', value, isString());
 *     }
 * }
 *
 * @returns {Predicate<string>}
 */
export declare function isString(): Predicate<string>;
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