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fix(form-core): reset field to undefined default in resetField - #2425
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resetField skipped the value update whenever the resolved default was undefined, treating "the default is undefined" as "no default exists". The field meta was reset while the field kept its current value. Decide whether a default exists from its sources (a field-level defaultValue or form-level defaultValues) instead of from the resolved value, so optional fields are reset to undefined again. Fixes TanStack#2424
🦋 Changeset detectedLatest commit: 5e4bafd The changes in this PR will be included in the next version bump. This PR includes changesets to release 14 packages
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📝 Walkthrough
Merge Risk: ⚪ Minimal · up to resetField now restores configured defaults, including explicit undefined and null, and tests cover these cases. No outstanding merge-blocking concerns were found. Pre-merge checks |
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| Check name | Status | Explanation |
|---|---|---|
| Linked Issues check |  |
Issue #2424 requires resetField() to restore an optional field to its default, including undefined, and to update field metadata. FormApi.resetField now detects configured defaults from field-le… |
| Out of Scope Changes check | |
The changes stay within issue #2424. FormApi.ts implements the reset behavior. FormApi.spec.ts adds regression coverage, including related nullish and falsy defaults. The changeset documents the p… |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2… |
| Description check | |
The description explains the bug, the behavioral change, test coverage, linked issue, release impact, and checklist status. It follows the repository template and provides sufficient implementation co… |
| Title check | |
The title clearly identifies the primary change: fixing form-core resetField behavior for fields whose default is undefined. |
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Inline comments:
Review comments at @packages/form-core/src/FormApi.ts:
- Around line 2944-2945: Update resetField’s default-value selection to fall
back to the form default only when fieldDefault is undefined, preserving a
field-level null value; add a test confirming resetField restores null when no
form defaultValues are set.
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.changeset/calm-fields-reset.mdpackages/form-core/src/FormApi.tspackages/form-core/tests/FormApi.spec.ts
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resetField resolved its target with `fieldDefault ?? formDefault`, so a field-level defaultValue of null fell through to the form-level default. Without defaultValues the field was reset to undefined instead of null, which disagreed with form.reset(). Only fall back to the form-level default when the field-level default is undefined.
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🎯 Changes
Fixes #2424.
form.resetField()only wrote a value back when the resolved default was notundefined. For an optional field whose default isundefined(set explicitly, or because its key is missing fromdefaultValues), the field meta was reset but the current value stayed.isDefaultValueremainedfalseand the result disagreed withform.reset().This is a regression from #2006 (
@tanstack/form-core@1.32.0), which replaced thethis.options.defaultValues ? … : prev.valuesguard withtargetValue !== undefined. That made "the default isundefined" indistinguishable from "no default exists".resetFieldnow decides whether a default exists from its sources (a field-leveldefaultValueor form-leveldefaultValues) instead of from the resolved value. A field-level default still takes priority over the form-level one, and that now includes a field-levelnull: the target was resolved with??, sonullfell through to the form-level default. A form withoutdefaultValuesand without a field-level default still keeps the current value, as the existing tests require.New tests cover form-level defaults of
undefined,null,'',false,0and a defined value, a key missing fromdefaultValues, nested and array item fields, field-level defaults whendefaultValuesis not provided, and a field-levelnulldefault with and withoutdefaultValues.✅ Checklist
pnpm test:pr, or these tests do not apply to this pull request.🚀 Release Impact
Summary by CodeRabbit
form.resetField()now restores fields to their configured defaults, includingundefined,null, empty strings,false, and zero. Field-level defaults take precedence over form-level defaults.