printError function Null safety
Prints the appName
, path
and error message
to stderr.
Implementation
Future<int> printError(String message,
{String appName = libName, String path = ''}) async {
if (path.isNotEmpty) {
stderr.writeln('$libName: $path: $message');
} else {
stderr.write('$libName: $message');
}
return exitFailure;
}