Svelte 5: Motion does not work in kit

[zhihengGet]

Describe the bug

below code works on svelte 4 and svelte 5

	const progress = tweened(0, {
		duration: 400,
		easing: cubicOut
	});
	progress.set(0.25)

but not sveltekit with svelte 5

svelte 5

Reproduction

included

Logs

No response

System Info

windows

Severity

cant run my code :(

[paoloricciuti]

This is because the component is run on the server where requestAnimationFrame is not defined...if you try to wrap everything in onMount or $effect it'll work

[rosemarymaker]

This is because the component is run on the server where requestAnimationFrame is not defined...if you try to wrap everything in onMount or $effect it'll work

Thanks! Most likely will solve my problem.

but since this is working in sveltekit+svelte4 and it is just initializing the tween value in server side, i don't think it should call requestAnimationFrame

I think it is still a bug.

[benmccann]

Adding this to the 5.0 milestone for the team to take a look at. At the very least we'd need to mention it in the breaking changes section and migration guide