5.19.1 breaks untrack

[gyzerok]

Describe the bug

Our app becomes broken after update to 5.19.1 perhaps due to #15065

Reproduction

UPDATE: REPL

Works fine for me if I switch to 5.19.0

Logs

System Info

Svelte 5.19.1

Severity

annoyance

[gyzerok]

Here is the repro

[elliott-with-the-longest-name-on-github]

Hunch: it's this: #15065

[elliott-with-the-longest-name-on-github]

Confirmed locally, reverting #15065 does indeed remove the error.

[trueadm]

I'm looking into it.

[wiesson]

Has it been released? I'm also noticing errors and rolled our application back to 5.19.0

Foo.svelte:38 Uncaught (in promise) ReferenceError: $0 is not defined if I look up the file, there is no $0

    at untrack (chunk-BQV2ORY5.js?v=78936540:1667:12) <-- mentions untrack
    at chunk-6ALURLPR.js?v=78936540:2370:29
    at update_reaction (chunk-BQV2ORY5.js?v=78936540:1211:23)
    at update_effect (chunk-BQV2ORY5.js?v=78936540:1316:21)
    at flush_queued_effects (chunk-BQV2ORY5.js?v=78936540:1411:11)
    at flush_queued_root_effects (chunk-BQV2ORY5.js?v=78936540:1397:7)
    at flush_sync (chunk-BQV2ORY5.js?v=78936540:1522:5)
    at update2 (chunk-6ALURLPR.js?v=78936540:410:9)
    at chunk-6ALURLPR.js?v=78936540:423:11

[trueadm]

Has it been released? I'm also noticing errors and rolled our application back to 5.19.0

Foo.svelte:38 Uncaught (in promise) ReferenceError: $0 is not defined if I look up the file, there is no $0

    at untrack (chunk-BQV2ORY5.js?v=78936540:1667:12) <-- mentions untrack
    at chunk-6ALURLPR.js?v=78936540:2370:29
    at update_reaction (chunk-BQV2ORY5.js?v=78936540:1211:23)
    at update_effect (chunk-BQV2ORY5.js?v=78936540:1316:21)
    at flush_queued_effects (chunk-BQV2ORY5.js?v=78936540:1411:11)
    at flush_queued_root_effects (chunk-BQV2ORY5.js?v=78936540:1397:7)
    at flush_sync (chunk-BQV2ORY5.js?v=78936540:1522:5)
    at update2 (chunk-6ALURLPR.js?v=78936540:410:9)
    at chunk-6ALURLPR.js?v=78936540:423:11

It has just now

[gyzerok]

Tried updating to 5.19.2 and reactivity seems to be broken somewhere around the REPL I've posted here. Will try to come up with modification to show reproduce tomorrow.

[trueadm]

Tried updating to 5.19.2 and reactivity seems to be broken somewhere around the REPL I've posted here. Will try to come up with modification to show reproduce tomorrow.

Interesting, I look forward to seeing what it is, maybe we missed something else.

[wiesson]

Has it been released? I'm also noticing errors and rolled our application back to 5.19.0
Foo.svelte:38 Uncaught (in promise) ReferenceError: $0 is not defined if I look up the file, there is no $0

    at untrack (chunk-BQV2ORY5.js?v=78936540:1667:12) <-- mentions untrack
    at chunk-6ALURLPR.js?v=78936540:2370:29
    at update_reaction (chunk-BQV2ORY5.js?v=78936540:1211:23)
    at update_effect (chunk-BQV2ORY5.js?v=78936540:1316:21)
    at flush_queued_effects (chunk-BQV2ORY5.js?v=78936540:1411:11)
    at flush_queued_root_effects (chunk-BQV2ORY5.js?v=78936540:1397:7)
    at flush_sync (chunk-BQV2ORY5.js?v=78936540:1522:5)
    at update2 (chunk-6ALURLPR.js?v=78936540:410:9)
    at chunk-6ALURLPR.js?v=78936540:423:11

It has just now

I still get those errors, even though If I remove all usages of untrack in the whole code base. Any idea what it could be or how to narrow it down?

// edit: Ok, it comes from $state management or sth like this. Maybe related to bits-ui