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feat(form-core): [v2] restore replaceValue on array fields - #2419
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Adds replaceFieldValue to the form and field group APIs and replaceValue to the field API (and Vue's field view), replacing the element at an index in place. Indices do not shift, so child fields keep their state. Closes TanStack#2418
🦋 Changeset detectedLatest commit: 52a6fe3 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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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe form core adds indexed array-element replacement through form and field APIs. The operation replaces an element without shifting child field positions. Vue field views also expose the field replacement method. ChangesArray Element Replacement
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The reviewed array replacement behavior has no identified issue requiring a fix before merge. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new operation uses the existing form mutation path and does not show an expansion of privileges or access beyond the caller’s form. Remaining uncertainty concerns how preserved child validation state relates to newly replaced values, especially while asynchronous validation is pending. Retained concerns Security review detailsSecurity Blast Radius
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Inline comments:
Review comments at @packages/form-core/src/FormApi/array-methods.lib.ts:
- Around line 140-148: Update the array element replacement flow near
form.setFieldValue so replacing an item refreshes or clears validation errors
for its existing child fields, including nested fields, while preserving their
field identity and state.
- Around line 125-128: Update the `isInvalidArrayMethod` validation used by
`replaceFieldValue` to reject non-integer indices before modifying the array,
and add a test confirming a fractional index is rejected without emitting a
change or marking the array field dirty.
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📒 Files selected for processing (13)
.changeset/brave-lists-replace.mddocs/arrays.mdpackages/form-core/src/FieldApi/FieldApi.lib.tspackages/form-core/src/FieldApi/FieldApi.public.tspackages/form-core/src/FieldGroup/FieldGroupApi.lib.tspackages/form-core/src/FormApi/FormApi.lib.tspackages/form-core/src/FormApi/FormApiArrayMethods.types.public.tspackages/form-core/src/FormApi/array-methods.lib.tspackages/form-core/tests/FieldApi/array-methods.spec.tspackages/form-core/tests/FormApi/field-array-methods.spec.tspackages/preact-form/tests/FieldGroupApi.test-d.tsxpackages/react-form/tests/FieldGroupApi.test-d.tsxpackages/vue-form/src/VueForm/fieldView.lib.ts
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LGTM!
form.replaceFieldValue is kind of useless since it's just form.setFieldValue with more arguments. However, field.replaceValue does have different semantics, so I think it's fine to keep.
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## alpha #2419 +/- ##
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3 participants
🎯 Changes
Closes #2418.
v1 array fields had
replaceValue(index, value); v2 dropped it (theArrayMethodstable still had a// 'replaceFieldValue'placeholder), so users fall back toremoveValue+insertValue. That needs two updates and two validation runs, and it kills the child field state atindexbefore re-creating it.This adds it back:
form.replaceFieldValue(name, index, value, options?)andfieldGroup.replaceFieldValue(...), typed withReplaceFieldValueFnlike the other array methodsfield.replaceValue(index, value, options?)onFieldApi, so it shows up onform.ArrayFieldrender props in every adapter, plus the forward in Vue's field viewIt works like the other array methods: it warns on a non-array value or an index outside
0..length - 1, and by default it marks the array field touched and dirty and runs change validation. No indices shift, so field nodes underitems[index]stay put and read the new value. That matches what the v1 version did with field meta.docs/arrays.mdlists the new method. I leftdocs/referencealone because the CI docs job regenerates it.Tests: runtime specs for the form and field variants (replacement, bounds/non-array warnings, meta, child fields kept, change validation, no node creation when meta updates are off), and type assertions in the React/Preact field-group type tests.
✅ Checklist
pnpm test:pr, or these tests do not apply to this pull request.Locally I ran:
vitestfor form-core (613 passed), react-form, vue-form, and preact-form;test:typesfor all 8 framework packages, including the multi-TS-version matrices;eslint; and prettier on the changed files.🚀 Release Impact
Summary by CodeRabbit
replaceValue(index, value)to array fields andreplaceFieldValue(fieldName, index, value)to form APIs, including Vue field views.