generatePassphrase.js

function generateSeedWallet() {
  const bip39 = require('bip39')
  const hdkey = require('ethereumjs-wallet/hdkey')
  const mnemonic = bip39.generateMnemonic() //generates string
  const seed = bip39.mnemonicToSeedSync(mnemonic).toString('hex')
  const hdwallet = hdkey.fromMasterSeed(bip39.mnemonicToSeed(seed))
  const wallet_hdpath = "m/44'/60'/0'/0/"
  const wallet = hdwallet.derivePath(wallet_hdpath + 0).getWallet()
  const address = '0x' + wallet.getAddress().toString('hex')
  const privateKey = wallet.getPrivateKey().toString('hex')
  return {mnemonic, address, privateKey}
}