how to fix 'parsing error: Unexpected token =>' in node?

Question

I am using firebase functions for stripe payment integration. This particular function used for register customer with stripe.

Node version 10.15.3 ,

npm version 6.9.0 ,

"ecmaVersion": 6 in .eslintrc.json

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

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

const stripe = require('stripe')(functions.config().stripe.testkey)

exports.createStripeCustomer = functions.auth.user()

          .onCreate(async (user) => {
             const customer = await
             stripe.customers.create({email: user.email});
             await admin.firestore()
               .collection('stripe_customers')
               .doc(user.uid)
               .set({customer_id: customer.id});

           });

The code is same as the firebase platform provide on github example https://github.com/firebase/functions-samples/blob/master/stripe/functions/index.js

Parsing error: Unexpected token =>

and if I change the "ecmaVersion": 6 to "ecmaVersion": 8 in .eslintrc.json

then error is .onCreate(async (user) => {

                            ^

SyntaxError: Unexpected token (

I want to deploy function properly so that user can register on stripe and date store in firebase storage

Answer 1

Make sure you are running in your local machine node >= 8. For deployment, you should have in your package.json.

{
    //...
    "engines": {
        "node": "8"
    },
    //...  
}

For eslint, to enable parsing for async functions, you should include this in your config:

{
    "parserOptions": {
        "ecmaVersion": 2017
    }
}