/**
 * Pure, dependency-free cron helpers: friendly preset (hourly / daily / weekly /
 * monthly) ↔ 5-field cron expression round-tripping, human-readable descriptions,
 * and a lightweight plausibility check. Originally built for the User Routines
 * editor; general-purpose for any schedule-editing UI.
 *
 * NOT a cron engine: for real validation, is-due checks, and next-occurrence math
 * use `CronExpressionHelper` in `@memberjunction/scheduling-engine` (parser-backed;
 * it can't live here without pulling cron-parser + core into MJGlobal).
 * {@link IsPlausibleCronExpression} is only a UI pre-filter, not validation.
 */
/** Which schedule preset a cron expression corresponds to (or 'advanced' when none). */
export type CronPresetKind = 'hourly' | 'daily' | 'weekly' | 'monthly' | 'advanced';
/** Structured schedule the editor binds to; converted to/from a cron expression. */
export interface CronSchedule {
    /** The preset in effect. 'advanced' means Raw is authoritative. */
    Kind: CronPresetKind;
    /** Minute (0-59). Hourly: minute past each hour. Other presets: minute of the run time. */
    Minute: number;
    /** Hour (0-23) for daily / weekly / monthly presets. */
    Hour: number;
    /** Day of week (0-6, 0 = Sunday) for the weekly preset. */
    DayOfWeek: number;
    /** Day of month (1-31) for the monthly preset. */
    DayOfMonth: number;
    /** Raw cron expression — authoritative when Kind === 'advanced'. */
    Raw: string;
}
/** Weekday display names indexed by cron day-of-week value (0 = Sunday). */
export declare const CRON_DAY_NAMES: readonly string[];
/** A fresh default schedule: daily at 9:00 AM. */
export declare function DefaultCronSchedule(): CronSchedule;
/** Builds the cron expression for a structured schedule. */
export declare function BuildCronExpression(schedule: CronSchedule): string;
/**
 * Parses a cron expression back into a structured schedule, detecting the friendly
 * presets the editor can render. Anything that doesn't match a preset shape comes
 * back as 'advanced' with Raw preserved (never lossy).
 */
export declare function ParseCronExpression(cron: string | null | undefined): CronSchedule;
/**
 * Human-friendly description of a cron expression. Covers the editor presets plus a
 * couple of common step shapes; anything else falls back to the raw expression so the
 * UI never shows a wrong description.
 */
export declare function DescribeCronExpression(cron: string | null | undefined): string;
/** Formats an hour/minute pair as a 12-hour clock time (e.g. "9:05 AM"). */
export declare function FormatTimeOfDay(hour: number, minute: number): string;
/** English ordinal for a day-of-month (1 → "1st", 22 → "22nd"). */
export declare function Ordinal(n: number): string;
/** Loose sanity check for a raw (advanced) cron expression: 5 or 6 whitespace-separated fields. */
export declare function IsPlausibleCronExpression(raw: string): boolean;
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