fix(form-core): flatten errors consistently when validating before field mount#2003
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LeCarbonator merged 2 commits intoTanStack:mainfrom Jan 23, 2026
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🦋 Changeset detectedLatest commit: b1b17cf The changes in this PR will be included in the next version bump. This PR includes changesets to release 13 packages
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #2003 +/- ##
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- Coverage 90.35% 89.46% -0.90%
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Files 38 48 +10
Lines 1752 1945 +193
Branches 444 488 +44
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+ Hits 1583 1740 +157
- Misses 149 184 +35
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LGTM! Thanks for the fix!
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🎯 Changes
Fixes #1993
Fixed an issue where
field.errorswas incorrectly nested as[[error]]instead of[error]whenform.validate()was called manually before a field was mounted.Problem:
The
flat(1)operation inFormApi.validateSync()only applied whenfieldInstanceexisted, causing unmounted fields to retain nested error arrays. This led to inconsistent error structure:['Error message']✅[['Error message']]❌Solution:
Changed the condition from
if (fieldInstance && !disableErrorFlat)toif (!fieldInstance || !disableErrorFlat)to applyflat(1)by default unlessdisableErrorFlatis explicitly true. This inverts the logic to "should flatten" rather than "should not flatten", ensuring unmounted fields are flattened correctly.Changes:
✅ Checklist
pnpm test:pr.🚀 Release Impact