This error usually happens when the module you're trying to import is not returning the expected class or object.

Make sure that your `redis-test.ts` is exporting a **valid object or function**, not `undefined`.

Also, if you're using CommonJS modules (`require`) and trying to import them using ES Modules (`import`), there can be a mismatch.

Try changing your `redis-test.ts` file like this:

```ts

import * as redis from 'redis';

const client = redis.createClient();

client.connect();

export default client;