chore: directly export function in non-HMR mode

[Rich-Harris]

this is vain, but it'd be cool if the 'JS output' tab had as little noise as possible. Right now a <h1>Hello world!</h1> component yields this:

// App.svelte (Svelte v5.0.0-next.115)
// Note: compiler output will change before 5.0 is released!
import "svelte/internal/disclose-version";
import * as $ from "svelte/internal/client";

var root = $.template(`<h1>Hello world!</h1>`);

function App($$anchor, $$props) {
	$.push($$props, false);
	$.init();

	var h1 = root();

	$.append($$anchor, h1);
	$.pop();
}

export default App;

Between this PR and #11319, it becomes this:

import * as $ from "svelte/internal/client";

var root = $.template(`<h1>Hello world!</h1>`);

export default function App($$anchor) {
	var h1 = root();

	$.append($$anchor, h1);
}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0f16183

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[dummdidumm]

I think this should stay if discloseVersion is true

[Rich-Harris]

why? feels like a semantic overload. i'm not sure the comment has much value

[dummdidumm]

I don't know, historical reasons I guess - Svelte always had a comment about it at the top historically. But I realize that's a silly argument and the actual discloseVersion probably does a better job at communicating the version, so I'm ok with it now.

[MrHBS]

I was wondering why the extra assignment and not simply $.append($$anchor, root);

[Rich-Harris]

That would be ideal but it would involve jumping through a bunch of extra hoops — I haven't tried it, but I would expect it to add a fair chunk of complexity. Minifiers will take care of it, so at the very least we're not adding overhead to prod bundles