import type { RecurrenceFrequency, WeekdayCode } from "../types";
/**
 * Splits an RRULE string into key/value parts.
 */
export declare function parseRuleParts(rule: string): Record<string, string>;
/**
 * Splits a comma-separated RRULE list value.
 */
export declare function splitCommaList(value: string): string[];
/**
 * Pads a number with leading zeros.
 */
export declare function padZero(value: number, length?: number): string;
/**
 * Returns whether a value is a supported recurrence frequency.
 */
export declare function isRecurrenceFrequency(value: string): value is RecurrenceFrequency;
/**
 * Returns whether a value is a supported weekday code.
 */
export declare function isWeekdayCode(value: string): value is WeekdayCode;