import { Weekday } from "./Weekday.enum";
/**
 * Determines the first day of week of the current or specified date
 * @param {Date|null} [date] Optional date from which the first day of the week should be determined. If no date is specified, the current date is used.
 * @param {Weekday} [startDay] Optional specification on which day a week starts. The enum can be used or the values 0-6 (0 = Sunday, 1 = Monday... 6 = Saturday). Monday is used by default
 * @return {Date} Returns the first day/date of week of current or specified date
 * @since 1.2.0
 */
export default function firstDayOfWeek(date?: Date | null, startDay?: Weekday): Date;
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