The solution to your problem is very simple.
Just assign a value to your name variable.

```ts
let name: string = "";
```

const name = (function() {
    switch(index) {
        case 0:
            return "cat";
        case 1:
            return "dog";
        default:
            return "idk";
    }
})()

**More on JS IIFE:** https://stackoverflow.com/a/8228308/21962459