Get piped in stdin if available

get_piped_stdin_only_if_available.dart

import 'dart:io' show stdin;
import 'dart:convert' show utf8;

main() async {
  try {
    String input = await stdin.timeout(Duration.zero).transform(utf8.decoder).first;
    print(input);
  } on TimeoutException {
    print('No input was piped into stdin');
  }
}