/**
 * scheduler-ical - pure, dependency-free iCalendar (RFC 5545) import / export for
 * the scheduler. Works on a small {@link ICalEvent} shape so it stays data-model
 * agnostic: map your rows to/from it. Handles timed + all-day events, RRULE
 * round-trip (via the shared {@link RecurrenceRule}), STATUS, DESCRIPTION and
 * LOCATION. No `Date.now()` in the core - `toICS` accepts a stamp.
 */
import type { RecurrenceRule } from './recurrence';
export type ICalEvent = {
    uid?: string;
    title: string;
    description?: string;
    location?: string;
    start: Date;
    end: Date;
    allDay?: boolean;
    status?: 'confirmed' | 'tentative' | 'cancelled';
    rrule?: RecurrenceRule | null;
};
/** A {@link RecurrenceRule} -> an iCal `RRULE` value (without the `RRULE:` name). */
export declare function ruleToRRule(rule: RecurrenceRule): string;
/** An iCal `RRULE` value -> a {@link RecurrenceRule}. */
export declare function rruleToRule(value: string): RecurrenceRule | null;
/** Serialize events to an iCalendar string. `stamp` sets DTSTAMP (default epoch). */
export declare function toICS(events: ReadonlyArray<ICalEvent>, opts?: {
    prodId?: string;
    stamp?: Date;
}): string;
/** Parse an iCalendar string into events (unfolds lines, reads VEVENT blocks). */
export declare function fromICS(text: string): ICalEvent[];