Ext import in Wasp file doesn't support importing from a folder via index.js and error message is bad

[Martinsos]

Related discord convo: https://discord.com/channels/686873244791210014/1291549944859066421/1293109502584815627 .

Our extension should have told you - hey this is not possible but it didn't. We are using a specific module resolution strategy called NodeNext which only allows explicit imports of the index.ts file and won't work for folder imports like the above.

So we don't support imports like

query getCourseTopics {
  fn: import { getCourseTopics } from "@src/server/queries",
  ...
}

but instead it has to be

query getCourseTopics {
  fn: import { getCourseTopics } from "@src/server/queries/index",
  ...
}

Question is, are happy with this? We might be, but in that case, we should make it clearer to the user that this is not allowed. User above had hard time figuring out this was the cause of the error he was getting is allegedly the error is this : Property 'topics' does not exist on type '{}' on the frontend which is far away from the real cause.

[sodic]

Closely related to #2222 and #2224