Doing what you suggested worked, I've also added hepipe.js, and then added a config.js with
var config = {
  hep_config: {
    debug: true,
    HEP_SERVER: 'xxxxxxx',
    HEP_PORT: xxxxx
  },
  esl_config: {
    debug: true,
    ESL_SERVER: '127.0.0.1',
    ESL_PORT: 8021,
    ESL_PASS...