isMonday
import { isMonday } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// Is 22 September 2014 Monday?
const result = isMonday(new Date(2014, 8, 22))
//=> true
function isMonday<DateType extends Date>(date: DateType | number | string): boolean;