问如何在dart控制台应用程序中禁用标准回显以进行密码输入

EN

Future<String> promptPassword() {
  var completer = new Completer<String>();
  var stream = new StringInputStream(stdin);
  stdout.writeString("Warning: Password will be displayed here until I find a better way to do this.\n");
  stdout.writeString("Watch your back...\n");
  stdout.writeString("GitHub password for $gituser: ");
  stream.onLine = () {
    var str = stream.readLine();
    stdin.close();
    completer.complete(str);
  };
  return completer.future;
}