endOfMonth
import { endOfMonth } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";
@example
// The end of a month for 2 September 2014 11:55:00:
const result = endOfMonth(new Date(2014, 8, 2, 11, 55, 0))
//=> Tue Sep 30 2014 23:59:59.999
function endOfMonth<DateType extends Date>(date: DateType | number | string): DateType;