Spreads props does not work on <svelte:window />

[minht11]

Describe the bug

<script>
	let count = $state(0);

	function increment() {
		count += 1;
	}

	const listeners = {
		onclick: increment,
	}
</script>

<svelte:window {...listeners} />

clicks: {count}

When running code above, window click handler should be set, instead nothing happens.

In fact no code is generated at all so this either work or should be marked as an error.

Reproduction

Reproduction

Logs

No response

System Info

"svelte": "5.0.0-next.40",

Severity

annoyance

[dummdidumm]

I think it should throw a validation error, and so should class:, let:, in:, out:, transition:, animate:

Technically it's a breaking change (someone could have that in Svelte 4 where it doesn't error but also doesn't do anything), so after sleeping on it, in the interest of full backwards compatibility, I'm not that sure anymore.

At the very least, spread props didn't work in Svelte 4 either, so this isn't a bug. Giving this the 5.0 milestone in the sense of "we need to decide what to do with this before 5.0, in case we want to go the throw validation errors route".

[dummdidumm]

We don't want to go the throw route, therefore moving to 5.x