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fix: fire afterUpdate even if dependencies are not used in template #9442

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@baseballyama baseballyama commented Nov 14, 2023

close: #9420

I think it was wrapped in untrack for some reason, but I couldn't figure out why. I hope it is just an implementation error.

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@@ -185,7 +185,7 @@ function init_update_callbacks() {
user_effect(() => {
called_before = false;
called_after = true;
untrack(() => update_callbacks.after.forEach(/** @param {any} c */ (c) => c()));
update_callbacks.after.forEach(/** @param {any} c */ (c) => c());
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I don't think this is the correct fix. This means that any signal reads inside update_callbacks are registered with our user_effect so it reruns whenever those change.

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Ah got it. I will re-fix it.

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I partly take that back - in order to fix all possible cases, we need to track the signals inside before/afterUpdate, but in a manner that they rerun at the correct time and not too often

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@dummdidumm Can you give me an example of an unnecessarily frequent rerun the before/afterUpdate?

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Unfortunately this isn't the solution — it doesn't cover this case, where no signal is referenced:

afterUpdate(() => {
  console.log('updating');
});

Closing in favour of #10408

@Rich-Harris Rich-Harris closed this Feb 6, 2024
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Svelte 5: afterUpdate only tracks props that are being used in the template
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