feat(form-core): Add options to reset/replace/delete all fields [FieldGroupApi]

[kusiewicz]

🎯 Changes

Regarding: #1684

This PR adds functionalities to the Field Group API:

resetAllFields - reset all group fields to their default values
deleteAllFields - delete all fields from the current group instance
replaceAllFields - replace all group fields with new provided values

When accepted, I will prepare documentation update.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

🦋 Changeset detected

Latest commit: bf03c6c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@tanstack/form-core	Patch
@tanstack/angular-form	Patch
@tanstack/form-devtools	Patch
@tanstack/lit-form	Patch
@tanstack/react-form	Patch
@tanstack/solid-form	Patch
@tanstack/svelte-form	Patch
@tanstack/vue-form	Patch
@tanstack/react-form-devtools	Patch
@tanstack/solid-form-devtools	Patch
@tanstack/react-form-nextjs	Patch
@tanstack/react-form-remix	Patch
@tanstack/react-form-start	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[nx-cloud]

View your CI Pipeline Execution ↗ for commit bf03c6c

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nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	47s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	1s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-01-17 16:51:29 UTC

[pkg-pr-new]

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• @tanstack/form-example-svelte-standard-schema
• @tanstack/form-example-vue-array
• @tanstack/form-example-vue-simple
• @tanstack/form-example-vue-standard-schema

@tanstack/angular-form

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commit: bf03c6c

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.13%. Comparing base (6892ed0) to head (bf03c6c).
⚠️ Report is 127 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/form-core/src/FieldGroupApi.ts	62.50%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1962      +/-   ##
==========================================
- Coverage   90.35%   89.13%   -1.23%     
==========================================
  Files          38       48      +10     
  Lines        1752     1969     +217     
  Branches      444      492      +48     
==========================================
+ Hits         1583     1755     +172     
- Misses        149      191      +42     
- Partials       20       23       +3     

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[LeCarbonator]

Not sure what codecov is on about, so I'll ignore that bit for the review. Thanks for tackling this!

[LeCarbonator]

Just a heads up, there's some reworks of how state works in TSF, so it would conflict with this PR. The changes shouldn't be drastic, but it'll likely cause a merge conflict once done.