I keep getting this error " 26:7 error Parsing error: Unexpected token function" in my command line whenever i try to deploy firebase cloud function using the "firebase deploy" command, please help this is my index.js code

'use strict'

const functions = require('firebase-functions');
const nodemailer = require('nodemailer');

const gmailEmail = functions.config().gmail.email;
const gmailPassword = functions.config().gmail.password;

const mailTransport = nodemailer.createTransport({
    service : 'gmail', 
    auth : {
        user: gmailEmail,
        pass: gmailPassword
    },
});

const APP_NAME = 'Instagram Clone'

exports.sendWelcomeEmail = functions.auth.user().onCreate((user)=>{
    const email = user.email;
    const displayName= user.displayName;

    return sendWelcomeEmail(email, displayName);
});

async function sendWelcomeEmail(email, displayName){
    const mailOptions = {
        from : `${APP_NAME} <noreply@firebase.com`, 
        to : email,
    };

    mailOptions.subject = `Welcome to ${APP_NAME}!`;
    mailOptions.text = `Hey ${displayName || ''}! Welcome to ${APP_NAME}, shit stressing me out`;

    await mailTransport.sendMail(mailOptions);
    console.log("Email sent to", email);

    return null;


    
}