supportedLocalesOf

Returns an array containing those of the provided locales that are supported in display names without having to fall back to the runtime's default locale.

Return

An array of strings representing a subset of the given locale tags that are supported in display names without having to fall back to the runtime's default locale.

MDN Reference.

Parameters

locales

A string with a BCP 47 language tag, or an array of such strings. For the general form and interpretation of the locales argument, see the Intl page.

options

An object with a locale matcher.