slip-0010 hdkey ed25519 derivation from seed in javascript

index.js

var ehdKey = require("@hawkingnetwork/ed25519-hd-key-rn")
var EdDSA = require('elliptic').eddsa

// test vector from https://github.com/satoshilabs/slips/blob/master/slip-0010.md
var seed = new Buffer('fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542', 'hex')
var ed25519 = new EdDSA('ed25519')
var derived = ehdKey.derivePath("m/0'/2147483647'", seed.toString('hex'))
var keys = ed25519.keyFromSecret(derived.key)

// expected test vector outputs
// 138f0b2551bcafeca6ff2aa88ba8ed0ed8de070841f0c4ef0165df8181eaad7f
// ea4f5bfe8694d8bb74b7b59404632fd5968b774ed545e810de9c32a4fb4192f4
// 005ba3b9ac6e90e83effcd25ac4e58a1365a9e35a3d3ae5eb07b9e4d90bcf7506d

console.log(derived.chainCode.toString('hex'))
console.log(derived.key.toString('hex'))
console.log('00' + new Buffer(keys.getPublic()).toString('hex'))