format method
Implementation
@override
FutureOr<String> format(Map<String, dynamic> args, {ErrorHandler? onError}) {
var parts = messages.map((v) => v.format(args, onError: onError));
if (parts.every((element) => element is String)) {
return parts.join();
}
return Future.wait(parts.map((v) => Future.value(v))).then((l) => l.join());
}