getISOWeeksInYear
import { getISOWeeksInYear } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// How many weeks are in ISO week-numbering year 2015?
const result = getISOWeeksInYear(new Date(2015, 1, 11))
//=> 53
function getISOWeeksInYear<DateType extends Date>(date: DateType | number | string): number;