Safely Generate Electrum-valid P2PKH Addresses From Your HD Wallet's XPUB key

p2pkhFromXpub.js

'use strict'

const { HDPublicKey, PublicKey, Address, Networks } = require('bitcore-lib')
const xpubkey = 'xpub...'
const hdPublicKey = HDPublicKey(xpubkey);

// We'll generate the first 20 addresses (default number of addresses that Electrum shows you)
for (let i = 0; i < 20; i++) {
  
  const orderPublicKey = hdPublicKey.deriveChild(`m/0/${i}`)
  // or
  // const orderPublicKey = hdPublicKey.deriveChild(0).deriveChild(i)
  
  var pubkey = PublicKey(orderPublicKey.publicKey)
  var address = Address.fromPublicKey(pubkey/* , Networks.testnet */)
  console.log("address", address)
}

how to get the private key