import type { CronYearValue } from "../types/CronYearValue.js";
import type { StringValueParser } from "../types/StringValueParser.js";
/**
 * Parses a string into a `CronYearValue`.
 *
 * @category Parsers
 * @example
 * ```typescript
 * parseStringYearValue("1989"); // 1989
 * parseStringYearValue("3000"); // undefined
 * ```
 * @param source string to be parsed.
 * @returns A `CronYearValue` or `undefined` if invalid.
 */
export declare const parseStringYearValue: StringValueParser<CronYearValue>;