Svelte 5.33.11: Maximum call stack size exceeded

[kyoshino]

Describe the bug

[email protected] has introduced the “Maximum call stack size exceeded” error in some of my SvelteKit projects. The only change in the release is #16038, and my code does use legacy mode and props. Downgrading to 5.33.10 removes the error.

Reproduction

REPL

<script>
  $: ({ events } = { events: [] });
  // The actual code is something like this where `data` comes from `+page.js`
  // $: ({ events } = data);
</script>

{#each events as event}
  <!--  -->
{/each}

Logs

System Info

System:
  OS: macOS 15.5
  CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Memory: 152.04 MB / 16.00 GB
  Shell: 3.2.57 - /bin/bash
Binaries:
  Node: 22.15.1 - /usr/local/opt/node@22/bin/node
  Yarn: 1.22.22 - /usr/local/bin/yarn
  npm: 10.9.2 - /usr/local/opt/node@22/bin/npm
  pnpm: 10.11.0 - /usr/local/bin/pnpm
Browsers:
  Chrome: 137.0.7151.55
  Safari: 18.5
npmPackages:
  svelte: 5.33.11 => 5.33.11

Severity

blocking an upgrade

[kevinashworth]

Same here. Downgrade to 5.33.10 solves it.

[kyoshino]

Confirming that upgrading to 5.33.13 solves the issue. Thanks for the quick fix! 💯