fix: keep input in sync when binding updated via effect #16464
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Fixes #16413 The previous fix was insufficient as it didn't account for effects running as a result of a change, which is executed in a different batch. Instead we now set a boolean that is true while an async branch is flushed.
🦋 Changeset detectedLatest commit: bf7de3a The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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@dummdidumm we've got also hit by this in prod. Mind making a new release when this gets merged? |
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Note that the test case behaves differently if you change |
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Rich-Harris
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Jul 22, 2025
Rich-Harris
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* - add state changes resulting from an $effect to a separate new batch - schedule rerunning effects based on the sources that are dirty, not just rerunning them all blindly (excempting async effects which will have run by that time already) * test * better fix * tests * this fixes the last test somehow * fix #16477 * typo * copy over changeset from #16477 * copy over changeset from #16464 * changeset * dedupe * move flushing_sync check inside Batch.ensure * unused * flushing_sync -> is_flushing_sync * remove flush_effects method * dedupe declaration * tweak * tweak * update comment — it _does_ feel slightly wrong, but no wronger than the rest of this cursed function --------- Co-authored-by: Simon Holthausen <[email protected]>
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Fixes #16413
The previous fix was insufficient as it didn't account for effects running as a result of a change, which is executed in a different batch. Instead we now set a boolean that is true while an async branch is flushed.
Also added a test for the expected async behavior where inputs should not update, AFAICT that didn't exist before.
Before submitting the PR, please make sure you do the following
feat:,fix:,chore:, ordocs:.packages/svelte/src, add a changeset (npx changeset).Tests and linting
pnpm testand lint the project withpnpm lint