getISOWeekYear
import { getISOWeekYear } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";
@example
// Which ISO-week numbering year is 2 January 2005?
const result = getISOWeekYear(new Date(2005, 0, 2))
//=> 2004
function getISOWeekYear<DateType extends Date>(date: DateType | number | string): number;