无法调用可能“未定义”的对象：导入和使用带有包含异步函数作为属性的返回对象的函数-解网

问：

这是我文件中导出的函数：adapter.ts

import type { Adapter } from "@lib/core/adapters";

export default function MyAdapter (): Adapter {
  return {
    async createUser (user: User) {
      ...
    },
    async findUserByEmail (email) {
      ...
    }
  }
}

我正在导入上述内容并尝试在处理程序函数中使用它：route.ts

import MyAdapter from "./adapter";

const adapter = MyAdapter();

export default async function handler(
  req: Request,
  res: Response
) {
  try {
    const profile = await adapter.findUserByEmail("[email protected]");
    ...
  } catch (e) {}
}

当我执行时，我收到此 TypeScript 错误：tsc

src/app/api/auth/signup/route.ts:22:37 - error TS2722: Cannot invoke an object which is possibly 'undefined'.

22         const profile = await adapter.findUserByEmail("[email protected]");
                                 ~~~~~~~~~~~~~~~~~~~~~~~

我可以通过初始化常量来“修复”这个问题，如下所示：adapter

const adapter = new (MyAdapter as any)();

但这似乎很骇人听闻，我也不明白发生了什么。函数应该是一个类吗？如果不需要，我不想创建新的实例化。MyAdapter

JavaScript 节点.js 打字稿 ecmascript-6 承诺

import type { Adapter } from "@lib/core/adapters";

export interface IMyAdapter extends Adapter {
  createUser: (user: User) => any; // replace any with your Return Type
  findUserByEmail: (email: string) => any;
}

export default function MyAdapter (): IMyAdapter {
  return {
    async createUser (user: User) {
      ...
    },
    async findUserByEmail (email) {
      ...
    }
  }
}

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无法调用可能“未定义”的对象：导入和使用带有包含异步函数作为属性的返回对象的函数

Cannot invoke an object which is possibly 'undefined': Importing and using function with return object containing async functions as properties

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