addRecipient method Null safety

TransactionBuilder addRecipient(
  1. dynamic to
)

Implementation

TransactionBuilder addRecipient(to) {
  if (!(to is Uint8List) && !(to is String)) {
    throw "'to' must be a string or Uint8List";
  }

  if (to is String) {
    if (isHex(to)) {
      to = hexToUint8List(to);
    } else {
      throw "'to' must be an hexadecimal string";
    }
  }
  data!.recipients!.add(to);
  return this;
}