feat(form-core): add <FieldMeta>.isValid

[LeCarbonator]

This meta property is a shortened alternative to checking
field.state.meta.errors.length === 0. Since FormApi already has this
property, a FieldApi variant wouldn't hurt to be more clear.

This PR is based on Balastrong's suggestion on Discord.

[nx-cloud]

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---

☁️ Nx Cloud last updated this comment at 2025-04-20 10:36:01 UTC

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commit: f671ab2

[LeCarbonator]

For some reason, refactoring this FormApi check fails horribly. Does someone know why?

- const isFieldsValid = !fieldMetaValues.some(
-           (field) =>
-             field?.errorMap &&
-             isNonEmptyArray(Object.values(field.errorMap).filter(Boolean)),
-         )

+ const isFieldsValid = fieldMetaValues.every(
+          (field) => field === undefined || field.isValid,
+        )

[Pascalmh]

Does this work?

const isFieldsValid = fieldMetaValues
  .filter(Boolean)
  .every((field) => field.isValid)

[LeCarbonator]

No, but it's clear that the meta needs to be adjusted in some places. I'll tinker with it tomorrow.

[LeCarbonator]

It's wild. I added checks wherever field errors or errorMap were tested for and it worked no problem. However, trying to rewrite isFieldsValid to use this boolean fails at 8 locations. I'll have to spend some more time figuring out how store works or something related to that

[LeCarbonator]

Does this work?

const isFieldsValid = fieldMetaValues
  .filter(Boolean)
  .every((field) => field.isValid)

It works now! This code wasn't the problem, but my implementation of isValid.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.00%. Comparing base (0c79f24) to head (f671ab2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1422      +/-   ##
==========================================
+ Coverage   88.83%   89.00%   +0.17%     
==========================================
  Files          31       31              
  Lines        1379     1401      +22     
  Branches      347      347              
==========================================
+ Hits         1225     1247      +22     
  Misses        137      137              
  Partials       17       17              

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