fix(form-core): allow optional arrays in helpers - #2376
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Allow nullable and optional array field keys in array-specific helpers while keeping item values inferred from the non-null array branch. Fix TanStack#1588
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThis change adds ChangesOptional array field support
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The update expands array helpers to nullable and optional array fields without any identified remaining merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant FieldApi
participant FormApi
participant FormState
FieldApi->>FormApi: delegate array mutation
FormApi->>FormApi: normalize missing value to []
FormApi->>FormState: store mutated array
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/form-core/src/FormApi.ts`:
- Line 2731: Normalize the previous value to an empty array with
Array.isArray(prev) ? prev : [] in insertFieldValue, replaceFieldValue,
removeFieldValue, swapFieldValues, and moveFieldValues before any slicing,
mapping, filtering, indexing, or spreading. Preserve existing behavior for
actual arrays, and add coverage for both undefined and null values across all
five helpers.
In `@packages/form-core/src/FormGroupApi.ts`:
- Line 2240: Update pushFieldValue, insertFieldValue, and replaceFieldValue in
FormGroupApi to import and use ArrayElement<DeepValue<TParentData, TField>> for
their value parameters instead of any, matching FieldGroupApi and preserving
array element type checking.
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📒 Files selected for processing (10)
.changeset/silver-arrays-collect.mdpackages/form-core/src/FieldApi.tspackages/form-core/src/FieldGroupApi.tspackages/form-core/src/FormApi.tspackages/form-core/src/FormGroupApi.tspackages/form-core/src/types.tspackages/form-core/src/util-types.tspackages/form-core/tests/FieldApi.test-d.tspackages/form-core/tests/FieldGroupApi.test-d.tspackages/form-core/tests/FormApi.test-d.ts
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Normalize nullish array field values before array helper operations and preserve FormGroupApi array element typing.
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🎯 Changes
Allows optional, nullable, and undefined-union array fields to use the form array helper APIs while preserving rejection for non-array fields and incorrect array element values.
Fix #1588
✅ Checklist
pnpm test:pr.🚀 Release Impact
Test verification (RED -> GREEN)
CI=1 NX_DAEMON=false NX_CLOUD_ACCESS_TOKEN='' pnpm --filter form-core run test:typespassed.never.Full local suite
./run-ci.shpassed locally after the final changes. It ran:pnpm install --frozen-lockfilepnpm nx run-many --targets="test:sherif,test:knip,test:docs,test:eslint,test:lib,test:types,test:build,build" --all --parallel=3 --outputStyle=stream --skipRemoteCachepnpm exec prettier --experimental-cli --ignore-unknown "**/*" --checkIndependent review gate: no blockers reported.
Summary by CodeRabbit
New Features
Tests