initializeMessages function
User programs should call this before using localeName
for messages.
Implementation
Future<bool> initializeMessages(String localeName) async {
LibraryLoader? lib = _deferredLibraries[Intl.canonicalizedLocale(localeName)];
await (lib == null ? Future.value(false) : lib());
initializeInternalMessageLookup(() => CompositeMessageLookup());
messageLookup.addLocale(localeName, _findGeneratedMessagesFor);
return true;
}