import type { Maybe } from "@vangware/types";
import type { CronUnix } from "../types/CronUnix.js";
/**
 * Parses a string into a `CronUnix`.
 *
 * @category Parsers
 * @example
 * ```typescript
 * parseStringUnix("* * * * *");
 * // {
 * // 	dayOfMonth: "*",
 * // 	dayOfWeek: "*",
 * // 	hours: "*",
 * // 	minutes: "*",
 * // 	month: "*",
 * // }
 *
 * parseStringUnix("* * * * *");
 * // {
 * // 	dayOfMonth: "*",
 * // 	dayOfWeek: "*",
 * // 	hours: "*",
 * // 	minutes: "*",
 * // 	month: "*",
 * // }
 *
 * parseStringUnix("1,2 1,2 1,2 1,2 1,2");
 * // {
 * // 	dayOfMonth: [1, 2],
 * // 	dayOfWeek: [1, 2],
 * // 	hours: [1, 2],
 * // 	minutes: [1, 2],
 * // 	month: [1, 2],
 * // }
 *
 * parseStringUnix("1-2 1-2 1-2 1-2 1-2");
 * // {
 * // 	dayOfMonth: { from: 1, to: 2 },
 * // 	dayOfWeek: { from: 1, to: 2 },
 * // 	hours: { from: 1, to: 2 },
 * // 	minutes: { from: 1, to: 2 },
 * // 	month: { from: 1, to: 2 },
 * // }
 *
 * parseStringUnix("1/2 1/2 1/2 1/2 1/2");
 * // {
 * // 	dayOfMonth: { every: 2, start: 1 },
 * // 	dayOfWeek: { every: 2, start: 1 },
 * // 	hours: { every: 2, start: 1 },
 * // 	minutes: { every: 2, start: 1 },
 * // 	month: { every: 2, start: 1 },
 * // }
 *
 * parseStringUnix("1-2,3,4 * 2W SEP,OCT 1L");
 * // {
 * // 	dayOfMonth: { nearest: 2 },
 * // 	dayOfWeek: { last: 1 },
 * // 	hours: "*",
 * // 	minutes: [{ from: 1, to: 2 }, 3, 4],
 * // 	month: ["SEP", "OCT"],
 * // }
 *
 * parseStringUnix("INVALID"); // undefined
 * ```
 * @param source string to be parsed.
 * @returns A `CronUnix` or `undefined` if invalid.
 */
export declare const parseStringUnix: (source: string) => Maybe<CronUnix>;