开个玩笑，我无法访问我导出的模块

Question

For example, I can't access to this module, why?

let nodeCacheClient;

module.exports = {
    initNodeCache: () => {
        const NodeCache = require("node-cache");
        nodeCacheClient = new NodeCache();
        return nodeCacheClient;
    },
    insertToCacheWithTtl: (key, obj, ttl) => {
        return nodeCacheClient.set(key, obj, ttl);
    },
    getCache: (key) => {
        return nodeCacheClient.get(key);
    },
    deleteKey: (key) => {
        return nodeCacheClient.del(key);
    },
};

when I run this test I get this: TypeError: Cannot read property 'get' of undefined Error

test("login a user", async () => {
        try {
            const response = await axiosInstance.post("users/login", {
                email: "test@gmail.com",
                password: "144847120",
                otpCode: getCacheClient.getCache("test@gmail.com")
            });
            console.log(response.data);
            expect(response.data.status).toBe("success");
        } catch (error) {
            console.log(error + " Error");
            expect(error);
        }
 });

Answer 1

It's totally normal!

Actually you got access to your module, and the error is coming into your module where the “ nodeCacheClient ” is undefined since it was not defined!

Your error is coming from your “ getCache() ” function, in this syntax:

return nodeCacheClient.get(key);

Where in your test you didnt call for the “ initNodeCache() ” method which will do

nodeCacheClient = new NodeCache();

So, for your test scope, the nodeCacheClient is undefined , and that's why

nodeCacheClient.get(key);

Will return the

typeError: Cannot read property 'get' of undefined Error