IntlFormatLocale
import type { IntlFormatLocale } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";The locale string (see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl#locales_argument).
type IntlFormatLocale = Intl.ResolvedDateTimeFormatOptions["locale"];