firebase-functions: Error occurred while parsing your function triggers.

node --version
v8.9.4

npm --version
5.6.0

firebase --version
3.17.4

firebase deploy --only functions

=== Deploying to ‘xxxxxx’…

i deploying functions Running command: npm --prefix $RESOURCE_DIR run lint

functions@ lint /Users/xx/Documents/Drive/AppDev/firebase/xxxx/functions eslint .

✔ functions: Finished running predeploy script. i functions: ensuring necessary APIs are enabled… ✔ functions: all necessary APIs are enabled i functions: preparing functions directory for uploading…

Error: Error occurred while parsing your function triggers.

ReferenceError: firebase is not defined at Object.<anonymous> (/Users/xxxxx/Documents/Drive/AppDev/firebase/xxxxx/functions/index.js:12:3) at Module._compile (module.js:570:32) at Object.Module._extensions…js (module.js:579:10) at Module.load (module.js:487:32) at tryModuleLoad (module.js:446:12) at Function.Module._load (module.js:438:3) at Module.require (module.js:497:17) at require (internal/module.js:20:19) at /usr/local/lib/node_modules/firebase-tools/lib/triggerParser.js:18:11 at Object.<anonymous> (/usr/local/lib/node_modules/firebase-tools/lib/triggerParser.js:38:3)

Content of my index.js index.js

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

  var config = {
    apiKey: "Alxxxxxxxxxxxxxxxx",
    authDomain: "xxxxxx.firebaseapp.com",
    databaseURL: "https://xxxxx.firebaseio.com"
  };


  firebase.initializeApp(config);

 exports.queryDb = functions.https.onRequest((req,res) =>
 {
   const text = req.query.text;

   console.log('Value of the text >' + text);
   res.send("Return value " + text  );
 });

The error is at this line firebase.initializeApp(config); If I comment that line , then the func deploys fine. I saw a similar thread, but whatever was listed there did not fix my problem. Any pointers would be much appreciated. I am on a mac.

Note: I xxxxx’d out the project and user details in the description above.