import type {
ContextOptions,
DateArg,
FirstWeekContainsDateOptions,
LocalizedOptions,
WeekOptions,
} from "./types.js";
/**
* The {@link setWeek} function options.
*/
export interface SetWeekOptions<DateType extends Date = Date>
extends LocalizedOptions<"options">,
WeekOptions,
FirstWeekContainsDateOptions,
ContextOptions<DateType> {}
/**
* @name setWeek
* @category Week Helpers
* @summary Set the local week to the given date.
*
* @description
* Set the local week to the given date, saving the weekday number.
* The exact calculation depends on the values of
* `options.weekStartsOn` (which is the index of the first day of the week)
* and `options.firstWeekContainsDate` (which is the day of January, which is always in
* the first week of the week-numbering year)
*
* Week numbering: https://en.wikipedia.org/wiki/Week#The_ISO_week_date_system
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
* @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
*
* @param date - The date to be changed
* @param week - The week of the new date
* @param options - An object with options
*
* @returns The new date with the local week set
*
* @example
* // Set the 1st week to 2 January 2005 with default options:
* const result = setWeek(new Date(2005, 0, 2), 1)
* //=> Sun Dec 26 2004 00:00:00
*
* @example
* // Set the 1st week to 2 January 2005,
* // if Monday is the first day of the week,
* // and the first week of the year always contains 4 January:
* const result = setWeek(new Date(2005, 0, 2), 1, {
* weekStartsOn: 1,
* firstWeekContainsDate: 4
* })
* //=> Sun Jan 4 2004 00:00:00
*/
export declare function setWeek<
DateType extends Date,
ResultDate extends Date = DateType,
>(
date: DateArg<DateType>,
week: number,
options?: SetWeekOptions<ResultDate>,
): ResultDate;