import { DayFormatType, DropdownData, FreqType, RecurrenceItems, RecurrenceState } from './types';
/**
 * Generates a default iCalendar recurrence rule (RFC 5545) string for a given frequency and reference date.
 *
 * @param {FreqType} freq - Recurrence frequency.
 * @param {Date} date - Reference `Date` used to derive day/month parts. If falsy or invalid, the current date is used.
 * @returns {string} A recurrence rule string (for example: 'FREQ=WEEKLY;INTERVAL=1;BYDAY=MO;').
 */
export declare function getDefaultRule(freq: FreqType, date: Date): string;
/**
 * Gets the two-letter weekday code for a given date.
 *
 * @param {Date} date The input Date object to extract the weekday from.
 * @returns {Date} The corresponding two-letter weekday code from WEEKDAY_CODES (e.g. 'MO', 'TU'). Defaults to 'SU' if index is out of range.
 */
export declare function getByDayFromDate(date: Date): string;
/**
 * Calculates the set position (week index) of the provided date within its month
 * for recurrence rule generation. If the date falls into the final overflow week
 * of the month, this method returns -1 to indicate the "last" week.
 *
 * @param {Date} date The date to evaluate.
 * @returns {number} The 1-based week index within the month, or -1 to indicate the last week.
 */
export declare function getBySetPosFromDate(date: Date): number;
export declare const getMonthData: (locale: string, calendarMode: string) => DropdownData[];
export declare const getDayData: (locale: string, calendarMode: string, firstDayOfWeek: number, format: DayFormatType) => RecurrenceItems[];
/**
 * Get the recurrence states from rule
 *
 * @param {string} rule - Recurrence rule string
 * @param {RecurrenceState} state - Initial recurrence states
 * @returns {RecurrenceState} processed recurrence rule states
 */
export declare function getRecurrenceStateFromRule(rule: string, state: RecurrenceState): RecurrenceState;
/**
 * Method to generate string from date
 *
 * @param {Date} date Accepts the date value
 * @returns {string} Returns the string value
 */
export declare function getRecurrenceStringFromDate(date: Date): string;