max-mapper

var KeyEncoder = require('key-encoder')
var VirgilCrypto = require('virgil-crypto').VirgilCrypto
var HDKey = require('hdkey')
const secp256k1 = require('secp256k1')

var keyEncoder = new KeyEncoder('secp256k1')

var hdKey = HDKey.fromMasterSeed(Buffer.from(SEED, 'hex'))
var childKey = hdKey.derive(PATH)

slavafomin

Here's how you could create custom error classes in Node.js using latest ES6 / ES2015 syntax.

I've tried to make it as lean and unobtrusive as possible.

Defining our own base class for errors

errors/AppError.js