svelte: Svelte 5: Doesn't work on iOS 15.0

Describe the bug

I tried to render a simple “Hello” world with Svelte 5 using SvelteKit on iOS 15.0 and page is blank and get a hydration error:

I also tried using Astro to not just blame SvelteKit and still get the error:

Reproduction

Open Svelte 5 app (develop & preview) on an iPhone 6s on iOS 15 Simulator and open page

Logs

No response

System Info

iPhone 6s on iOS 15 Simulator

Severity

blocking an upgrade

About this issue

Original URL
State: open
Created 5 months ago
Reactions: 1
Comments: 15 (7 by maintainers)

Most upvoted comments

Support is only good as of very recently so I would be in favor of avoiding this method in the runtime (or apply a polyfill ourselves). I’m wondering how we can avoid these kinds of accidental breakages in general. In the meantime, you can polyfill it something like this.

dummdidumm on Feb 9, 2024

Yeah, as mentioned, we think it does make sense for the Svelte runtime to avoid using Array.prototype.at. The polyfill on your end should only need to be temporary.

Conduitry on Feb 9, 2024