Firebase云函数警告:“箭头函数预期无返回值一致返回”

出于某种原因,当我部署我从未见过的云功能时,我在终端上得到了输出。

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

> functions@ lint /Users/xxxxx/Desktop/cloud_functions/cloud_functions_live/functions
> eslint .


/Users/xxxxx/Desktop/cloud_functions/cloud_functions_live/functions/index.js
  38:5  warning  Arrow function expected no return value  consistent-return

✖ 1 problem (0 errors, 1 warning)

index.js中的第38行也是返回值 return docRef.doc("/payments/${payment}").get()

exports.stripeCharge = functions.firestore.document('/payments/{payment}').onCreate((snap, context) => {

    console.log("payment data", snap);

    const payment = snap.data();

    console.log("payment data2", payment.token);
        //console.log("payment data2", payment.token.idempotency_key);


    if (!payment || payment.charge) return;


    var docRef = admin.firestore()
    const idempotency_key = payment.idempotency_key;  // prevent duplicate charges

    //.document(`/payments/${payment}`);
    //var docRef = 

    return docRef.doc(`/payments/${payment}`).get()
            .then(snapshot => {
            console.log("augu", snapshot);
            return snapshot;
            })
            .then(customer => {
                 const amount = payment.amount;
                 const source = payment.token;
                 const currency = payment.currency;
                 const charge = {amount, currency, source};

                 console.log("brett", charge);
                 return stripe.charges.create(charge, { idempotency_key });

            })
            .then(charge => {
                console.log("set charge back");
                return docRef.doc(`/charges/${idempotency_key}`).set(charge);
            })

})