fix(form-core): prevent FormApi#moveFieldValues from mutating defaultValues

[tmarnet]

This PR addesses the following issue: #1559

💡 Open question: I don't know if other field array methods suffer from the same issue but, if some do, should we address those in this PR too?

[LeCarbonator]

Good catch! Just a nitpick with the unit test, but the fix itself looks good to me!

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 4a25c1f.

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	1m 19s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	22s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-06-06 17:48:15 UTC

[pkg-pr-new]

More templates

• @tanstack/form-example-angular-array
• @tanstack/form-example-angular-simple
• @tanstack/form-example-lit-simple
• @tanstack/form-example-lit-ui-libraries
• @tanstack/form-example-react-array
• @tanstack/form-example-react-compiler
• @tanstack/field-errors-from-form-validators
• @tanstack/form-example-react-large-form
• @tanstack/form-example-react-next-server-actions
• @tanstack/form-example-react-query-integration
• @tanstack/form-example-remix
• @tanstack/form-example-react-simple
• @tanstack/form-example-react-standard-schema
• @tanstack/form-example-react-tanstack-start
• @tanstack/form-example-react-ui-libraries
• @tanstack/form-example-solid-array
• @tanstack/form-example-solid-simple
• @tanstack/form-example-svelte-array
• @tanstack/form-example-svelte-simple
• @tanstack/form-example-vue-array
• @tanstack/form-example-vue-simple

@tanstack/angular-form

npm i https://pkg.pr.new/@tanstack/angular-form@1560

@tanstack/form-core

npm i https://pkg.pr.new/@tanstack/form-core@1560

@tanstack/lit-form

npm i https://pkg.pr.new/@tanstack/lit-form@1560

@tanstack/react-form

npm i https://pkg.pr.new/@tanstack/react-form@1560

@tanstack/solid-form

npm i https://pkg.pr.new/@tanstack/solid-form@1560

@tanstack/svelte-form

npm i https://pkg.pr.new/@tanstack/svelte-form@1560

@tanstack/vue-form

npm i https://pkg.pr.new/@tanstack/vue-form@1560

commit: 4a25c1f

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.25%. Comparing base (77acb33) to head (4a25c1f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1560   +/-   ##
=======================================
  Coverage   89.24%   89.25%           
=======================================
  Files          31       31           
  Lines        1432     1433    +1     
  Branches      366      366           
=======================================
+ Hits         1278     1279    +1     
  Misses        137      137           
  Partials       17       17           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[LeCarbonator]

Thanks for the fix!