export interface CalendarDayLike {
    readonly year: number;
    readonly month: number;
    readonly day: number;
}
export declare function isoWeekNumber(date: CalendarDayLike): number;
/** ISO weekday (1 = Monday … 7 = Sunday) of a calendar date, zone-independent. */
export declare function isoWeekday(date: CalendarDayLike): number;
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