NTLM Authentication with node-fetch

ntlm.js

/* eslint-disable no-console */

const https = require('https');
const fetch = require('node-fetch');
const ntlm = require('httpntlm').ntlm;

const keepAlive = new https.Agent({ keepAlive: true });

const handleErrors = (response) => {
  if (!response.ok) {
    throw Error(response.statusText);
  }

  return response;
};

const handshake = (url, authOpts) => fetch(url, {
  headers: {
    Connection: 'keep-alive',
    Authorization: ntlm.createType1Message(authOpts),
  },
  agent: keepAlive,
})
.then(response => response.headers.get('www-authenticate'))
.then((auth) => {
  if (!auth) {
    throw new Error('Stage 1 NTLM handshake failed.');
  }

  const type2 = ntlm.parseType2Message(auth);
  return ntlm.createType3Message(type2, authOpts);
});

const url = 'http://my-ntlm-auth-endpoint.com/abc';

const authOpts = {
  username: 'AD_USERNAME',
  password: 'AD_PASSWORD',
  domain: 'AD_DOMAIN',
  workstation: '',
};

handshake(url, authOpts).then(auth =>
  fetch(url, {
    headers: {
      Authorization: auth,
      'Content-Type': 'application/zip',
    },
    agent: keepAlive,
    body: deploymentPkg,
  }))
.then(handleErrors)
.then(() => console.log(`Done`))
.catch(e => console.error('Failed', e));

what is deplymentpkg at line 50 ?