如何解决打字稿错误“对象可能是'未定义'"；

问题描述

我正在构建一个云功能，它将使用Stripe API来处理付款.这是在firebase项目中.当我运行firebase deploy时，出现错误对象是可能的'未定义'" const existingSource = customer.sources.data.filter( (s) => s.id === source).pop();我不确定该如何解决.

I'm building a cloud function that will use the Stripe API to process payments. This is within a firebase project. When I run firebase deploy I get the error "Object is possible 'undefined'" const existingSource = customer.sources.data.filter( (s) => s.id === source).pop();I'm not sure how to resolve this.

这是我的xxx.ts，其中存在getorCreateCustomer

Here is my xxx.ts where getorCreateCustomer exists

/** Read the stripe customer ID from firestore, or create a new one if missing */
export const getOrCreateCustomer = async(uid: string) => {
    const user = await getUser(uid);
    const customerId = user && user.stripeCustomerId;

    //if missing customerId, create it
    if (!customerId) {
        return createCustomer(uid);
    }
    else {
        return stripe.customers.retrieve(customerId);
    }
}

推荐答案

7个月后，我找到了最佳解决方案.

7 months later, I figured out the best solution.

我只是在以下if/else语句中包装了Firebase可调用函数的内容.有点多余，但是可以用.

I simply wrapped the the contents of the firebase callable function in the following if/else statement. It's a bit redundant but it works.

if (!context.auth) {
    // Throwing an HttpsError so that the client gets the error details.
    throw new functions.https.HttpsError('failed-precondition', 'The function must be called ' +
        'while authenticated.');
  }
  else{ ...copy function code here }

如果您不关心身份验证项，则可以简单地将上下文类型定义为 any .

If you don't care about the authentication piece you can simply define the type of context as any.

(data, context:any)

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