gistfile1.txt

const doABRegister = function( connectAPI, { appGuid, serialNumber, email }, data, logger ) {

  const deviceIdPromise = doABRegisterDevice( connectAPI, appGuid, serialNumber );
  const accountIdPromise = deviceIdPromise
    .then( deviceId => doABCreateAccount( connectAPI, appGuid, deviceId, email, data );
  const vhIdPromise = Promise.all([deviceIdPromise, accountIdPromise])
    .then( ([deviceId, accountId]) => doABFetchVh( connectAPI, { appGuid, deviceId, accountId }, data, logger );
  return Promise.all([deviceIdPromise, accountIdPromise, vhIdPromise])
    .then( ([deviceId, accountId, vhId]) => ( { deviceId, accountId, vhId } );
};