my point is, i can't understand why you would bring VSCode up at all in a discussion about webpack's relationship to "vanilla js" (whatever that is).
(btw i was using the term "preprocessor" loosely - i meant source-transforming tools in general)
Just like using webpack has nothing to do with how you interact with the DOM.
i am a bit biased, based on my recent experience of trying to load a webpacked library's `dist/foobar.js` into a WordPress thing via a normal <script src="..."> and having it barf all over the console, yelling about `window.module` missing and loaders and stuff. i never managed to get the bundled version to load, which reinforces my opinion - it's not "vanilla" if it needs some custom infrastructure and can't just be dropped into an existing plain js environment.
i did however manage to load the unbundled source with a native ES6 <script type="module">, and it worked great! vanilla js can be pretty pleasant these days :)
I thought vanilla means not using front end view framework/library such as Vue, React, jQuery...
ignoring framework stuff (bc everyone seems to agree there) i'd say if your js qualifies as "vanilla" if it can run in a relatively recent browser without a build step or other transformations. you might further ES5-ify, uglify and minify it for practical reasons, but that must be an optional thing
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since we're splitting hairs, we could also distinguish "theoretically vanilla js" - js that's standard ECMAScript so it'll run fine when browser catch up, but it's not supported just yet and thus needs transforming. this would exclude non-standard extensions like JSX
and note that i don't mean "vanilla" as any sort of value judgement! it's a practical description of how it works, not some kind of platonic ideal to aspire to – frameworks, webpack, Babel etc provide useful solutions for the shortcomings of the browser platform and ecosystem. the thing i was talking about is a single-file internal tool, and compat isn't a problem; if it was user-facing, i'd probably use some ES5-ifying tool myself. and i'd probably use JSX if i was doing a React thing, because it's great - inline HTML is an underappreciated convenience in PHP!
i'd say your js qualifies as "vanilla"
in the first paragraph, can't edit anymore