sendFunds_accountSign.js

const Dash = require('dash');

const clientOpts = {
  network: 'testnet',
  wallet: {
    mnemonic: 'mnemonic with funds',
  }
};
const client = new Dash.Client(clientOpts);

async function sendFunds() {
  const account = await client.wallet.getAccount();
  await account.isReady();
  
  try {
    const transaction = account.createTransaction({
      recipient: 'yNPbcFfabtNmmxKdGwhHomdYfVs6gikbPf', // Evonet faucet
      satoshis: 1000000, // 1 Dash
    });
    // transaction.addData('correct horse battery staple')
    const signedTransaction = account.sign(transaction)
    const result = await account.broadcastTransaction(transaction);
    console.log('Transaction broadcast!\nTransaction ID:', result);
  } catch (e) {
    console.error('Something went wrong:', e);
  } finally {
    client.disconnect();
  }
}

sendFunds();

throws error:

Something went wrong: Error: Require one or multiple privateKeys to sign
    at KeyChain.sign (node_modules/@dashevo/wallet-lib/src/types/KeyChain/methods/sign.js:13:27)
    at Account.sign (node_modules/@dashevo/wallet-lib/src/types/Account/methods/sign.js:8:24)
    at sendFunds (sendFunds.js:21:39)
    at process._tickCallback (internal/process/next_tick.js:68:7)