Failed to load module script: The server responded with a non-JavaScript MIME type of "text/html". 

I just have two lines in my index.js file

```
import Notion from "./node_modules/notion-api-js"
console.log("Hello Notion")
```

and I get this error : 
`Failed to load module script: The server responded with a non-JavaScript MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.`

How do I resolve this?