Web3.js eth_sign vs personal_sign

sign.js

const Web3 = require('web3')
const PrivateKeyProvider = require('truffle-privatekey-provider')

async function main() {
  const address = '0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1'
  const privateKey = '4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d'
  const provider = new PrivateKeyProvider(privateKey, 'https://mainnet.infura.com')
  const web3 = new Web3(provider)
  const message = 'Hello world'
  
  const sig1 = await web3.eth.personal.sign(message, address)
  const sig2 = await web3.eth.sign(message, address)

  console.log(sig1)
  console.log(sig2)
  console.log(sig1 === sig2) // true
}

main()

Great snippet, web3.eth.personal.sign() now requires a password argument as the last argument