VS Code doesn't show autocomplete for Mongoose MongoDB operators (like $elemMatch, $match,$gte and ...) in JavaScript, while WebStorm does

### Problem

When working with Mongoose in JavaScript (not TypeScript), VS Code does not show autocomplete suggestions for common MongoDB operators like `$inc`, `$eq`, `$ne`, etc.

However, when using WebStorm, these suggestions appear as expected.

### Example

```js
const result = await User.find({
$or: [
{ userName: { $elemMatch: { name: "Mehdi" } } },
{ age: { $gte: 18 } }
]
});
```
In the above example, $or doesn't appear in suggestions while typing in VS Code, but it does in WebStorm.

What I Know
I understand that VS Code relies heavily on TypeScript's language service for JavaScript intelligence.

But since this is a common pattern in many Node.js/Mongoose applications, I'm wondering:

Is there a way to configure VS Code (via jsconfig.json, type acquisition, or something else) to provide better autocomplete for these $ MongoDB operators in plain JavaScript files?

Environment
VS Code: latest

Language mode: JavaScript

Mongoose version: latest

Node.js version: 21

OS: Windows

Thanks for the awesome editor 🙌

まず、issue にある Mongoose クエリを使って、単純な JavaScript ファイルで不足している候補を再現します。言及されている jsconfig.json、型の取得、TypeScript language service の動作を調査します。完了の条件は、設定または language service のサポートによって MongoDB 演算子の補完を提供できるかどうかを明らかにすることです。

索引モデルが issue の本文から書いたものです。