How to use the @zilliqa-js/account.TxStatus.Pending function in @zilliqa-js/account

async prepare(tx: Transaction): Promise {
    const response = await this.provider.send(
      RPCMethod.CreateTransaction,
      { ...tx.txParams, priority: tx.toDS },
    );

    if (response.error || !response.result) {
      this.address = undefined;
      this.error = response.error;
      tx.setStatus(TxStatus.Rejected);
    } else {
      tx.id = response.result.TranID;
      tx.setStatus(TxStatus.Pending);
      return response.result.ContractAddress;
    }
  }