/*
BIP39: Mnemonic code for generating deterministic keys , BIP39 - used to manage your recovery seed and recovery words. Abstract. This BIP describes the implementation of a mnemonic code or mnemonic sentence – a group of easy to remember words – for the generation of deterministic wallets. It consists of two parts: generating the mnemonic, and converting it into a binary seed
*/
let bip39 = require("bip39");

/*
A lightweight wallet implementation. At the moment it supports key creation and conversion between various formats.
To use BIP32 HD wallets, first include the hdkey submodule,
For the seed i suggest to use bip39.
*/
let hdkey = require('ethereumjs-wallet');

/*
bitcoinjs is a proven library and ecosystem for Bitcoin development using javascript.
*/
let bitcoin = require('bitcoinjs-lib');

let wallet_hdpath = "m/44'/0'/0'/0/0";
hdwallet =  bitcoin.HDNode.fromSeedBuffer(bip39.mnemonicToSeed(seed));
let wallet = hdwallet.derivePath(wallet_hdpath + index)

Now from wallet you can get privatekey and address both