/**
 * Cron parser and scheduling helpers.
 *
 * Five-field POSIX-style cron (minute hour day-of-month month day-of-week).
 * Supports wildcards (*), lists (a,b,c), ranges (a-b), steps (*\/n), and
 * Sunday-as-7 normalization. Minute granularity only.
 *
 * Extracted from daemon/server.ts so it can be shared with the boot loader
 * and exercised by focused tests.
 */
export declare function parseCronField(field: string, min: number, max: number): number[] | null;
/**
 * Compute the next cron occurrence strictly after `fromTime` (defaults to
 * now). Returns `{isValid: false, nextRun: 0}` on malformed cron or if no
 * occurrence is found within four years.
 */
export declare function parseCron(cron: string, fromTime?: number): {
    isValid: boolean;
    nextRun: number;
};
/**
 * Find the most recent cron occurrence strictly after `lastRunAt` and at or
 * before `now`. Returns `null` if no occurrence fits the window, the cron is
 * malformed, or `lastRunAt` is not in the past.
 *
 * Used at daemon boot: if a schedule was supposed to fire while the daemon
 * was down, this identifies the most recent missed occurrence so the caller
 * can trigger one catch-up run. Older missed occurrences are intentionally
 * dropped to avoid a flood of invocations after a long outage.
 *
 * Complexity: iterates backward minute-by-minute from `now` to `lastRunAt`,
 * bounded at 14 days. For typical schedules the first matching minute is
 * found within a few hundred iterations.
 */
export declare function computeMissedRun(cron: string, lastRunAt: number, now: number): number | null;
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