/**
 * Minimal iCalendar (RFC 5545) codec for the calendar demo — pure data, no
 * I/O. Parses the common real-world subset honestly and marks what it can't
 * expand rather than inventing dates:
 *
 *   • line unfolding / folding, text escaping
 *   • VEVENT: UID, SUMMARY, LOCATION, DESCRIPTION, DTSTART/DTEND
 *     (date-time, all-day VALUE=DATE, UTC "Z", TZID via Intl best-effort,
 *     floating = local), DURATION fallback
 *   • RRULE: simple FREQ=DAILY/WEEKLY/MONTHLY with INTERVAL/COUNT/UNTIL and
 *     WEEKLY BYDAY, expanded inside a caller-given horizon (cap 500
 *     instances); anything gnarlier keeps the first instance flagged
 *     `recurring` instead of silently-wrong dates
 *   • EXDATE (exact-instant removal)
 */
export interface IcsEvent {
    uid: string;
    summary: string;
    location?: string;
    description?: string;
    startMs: number;
    endMs: number;
    allDay: boolean;
    /** RRULE was present but too complex to expand — first instance only */
    recurring?: boolean;
}
export interface IcsCalendar {
    /** X-WR-CALNAME when present */
    name?: string;
    events: IcsEvent[];
}
/** RFC 5545 §3.1 — a CRLF followed by space/tab continues the line */
export declare function unfoldLines(text: string): string[];
/** UTC offset (ms) of an IANA zone at a given instant, via Intl */
export declare function zoneOffsetMs(ms: number, tz: string): number;
/** parse an ICS date/date-time value to Unix ms; allDay for VALUE=DATE */
export declare function parseIcsDate(value: string, params?: Record<string, string>): {
    ms: number;
    allDay: boolean;
} | null;
/** basic ISO-8601 duration (PnW / PnDTnHnMnS subset) → ms */
export declare function parseIcsDuration(value: string): number | null;
/**
 * Expand a simple RRULE within [fromMs, toMs]. Returns null when the rule is
 * beyond the supported subset (caller keeps the first instance + a flag).
 */
export declare function expandRrule(rule: string, startMs: number, fromMs: number, toMs: number, cap?: number): number[] | null;
export declare function parseIcs(text: string, opts?: {
    fromMs?: number;
    toMs?: number;
}): IcsCalendar;
export declare function serializeIcs(events: readonly IcsEvent[], name?: string): string;
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