Firebase Serve: Error occurred while parsing your function triggers

Question

Im trying to use firebase serve in order to get my localhost url I can't seem to move past this issue. Here is my index.js

    const functions = require('firebase-functions');
    const admin = require('firebase-admin');
    admin.initializeApp();
    
    // Database reference
    const dbRef = admin.firestore().doc('tokens/demo');
    
    // Twitter API init
    const TwitterApi = require('twitter-api-v2').default;
    const twitterClient = new TwitterApi({
      clientId: 'YOUR_CLIENT_ID',
      clientSecret: 'YOUR_CLIENT_SECRET',
    });
    
    // STEP 1 - Auth URL
    exports.auth = functions.https.onRequest((request, response) => {});
    
    // STEP 2 - Verify callback code, store access_token 
    exports.callback = functions.https.onRequest((request, response) => {});
    
    // STEP 3 - Refresh tokens and post tweets
    exports.tweet = functions.https.onRequest((request, response) => {});