Broken page with Svelte 5: uncaught `effect_update_depth_exceeded`

[probablykasper]

Describe the bug

Upgrading from Svelte 5 (without making any code changes) resulted in an infinite effect_update_depth_exceeded error

Reproduction

https://svelte.dev/playground/48f838c2c37d447faa909ea9bd50d90f?version=5.1.6

Logs

Error: effect_update_depth_exceeded Maximum update depth exceeded. This can happen when a reactive block or effect repeatedly sets a new value. Svelte limits the number of nested updates to prevent infinite loops

Severity

blocking an upgrade

Additional Information

No response

[knd775]

Can confirm. This is also happening to a number of our selects.

[Travja]

Dependabot upgraded our project from 4.2.19 to 5.0.5 and I'm seeing this issue as well.

[knd775]

It only happens when the component isn't in runes mode.

[Travja]

I've been trying to make sure that everything is properly updated to Svelte 5 syntax for runes and everything but am still facing the issue. It's possible that I have more updating to do. My project is fairly complex with a lot of moving parts.

Edit: looks like I got things figured out.

[probablykasper]

@dummdidumm Hey, wondering if this bug could be looked at (it's blocking me from upgrading to Svelte 5). Not sure if it fell through the cracks