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

[Rajat Kumar Gupta]

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?