From 43f3f0669580792809f4eba4ad9cc24bd67215ad Mon Sep 17 00:00:00 2001
From: Harry Whorlow <whorlowharry@gmail.com>
Date: Sat, 2 Aug 2025 12:10:22 +0200
Subject: [PATCH 1/2] fix(core): pushed fields missing on change errors

---
 packages/form-core/src/FormApi.ts         |  1 +
 packages/form-core/tests/FieldApi.spec.ts | 66 +++++++++++++++++++++++
 packages/react-form/src/useForm.tsx       |  3 +-
 3 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/packages/form-core/src/FormApi.ts b/packages/form-core/src/FormApi.ts
index 1dfb98e97..84e0eb2cd 100644
--- a/packages/form-core/src/FormApi.ts
+++ b/packages/form-core/src/FormApi.ts
@@ -1981,6 +1981,7 @@ export class FormApi<
       (prev) => [...(Array.isArray(prev) ? prev : []), value] as any,
       opts,
     )
+
     this.validateField(field, 'change')
   }
 
diff --git a/packages/form-core/tests/FieldApi.spec.ts b/packages/form-core/tests/FieldApi.spec.ts
index 1935e19d4..e84579a24 100644
--- a/packages/form-core/tests/FieldApi.spec.ts
+++ b/packages/form-core/tests/FieldApi.spec.ts
@@ -2500,4 +2500,70 @@ describe('field api', () => {
 
     expect(field.state.meta.errors).toStrictEqual(['Blur error'])
   })
+
+  it('should pass errors to pushed fields', () => {
+    const schema = z.object({ arr: z.array(z.string().min(2)) })
+
+    const form = new FormApi({
+      defaultValues: {
+        arr: [''],
+      },
+      validators: { onChange: schema },
+    })
+    form.mount()
+
+    const field = new FieldApi({
+      form,
+      name: 'arr',
+    })
+    field.mount()
+    field.pushValue('')
+
+    expect(form.state.errors).toStrictEqual([
+      {
+        'arr[0]': [
+          {
+            code: 'too_small',
+            exact: false,
+            inclusive: true,
+            message: 'String must contain at least 2 character(s)',
+            minimum: 2,
+            path: ['arr', 0],
+            type: 'string',
+          },
+        ],
+        'arr[1]': [
+          {
+            code: 'too_small',
+            exact: false,
+            inclusive: true,
+            message: 'String must contain at least 2 character(s)',
+            minimum: 2,
+            path: ['arr', 1],
+            type: 'string',
+          },
+        ],
+      },
+    ])
+
+    const fieldIndexed = new FieldApi({
+      form,
+      name: 'arr[1]',
+    })
+    fieldIndexed.mount()
+
+    expect(fieldIndexed.state.meta.errors).toStrictEqual({
+      errors: [
+        {
+          code: 'too_small',
+          minimum: 2,
+          type: 'string',
+          inclusive: true,
+          exact: false,
+          message: 'String must contain at least 2 character(s)',
+          path: ['arr', 1],
+        },
+      ],
+    })
+  })
 })
diff --git a/packages/react-form/src/useForm.tsx b/packages/react-form/src/useForm.tsx
index ce3c8ecd5..a65afc500 100644
--- a/packages/react-form/src/useForm.tsx
+++ b/packages/react-form/src/useForm.tsx
@@ -6,13 +6,12 @@ import { useIsomorphicLayoutEffect } from './useIsomorphicLayoutEffect'
 import type {
   AnyFormApi,
   AnyFormState,
-  BaseFormOptions,
   FormAsyncValidateOrFn,
   FormOptions,
   FormState,
   FormValidateOrFn,
 } from '@tanstack/form-core'
-import type { ComponentType, JSX, PropsWithChildren, ReactNode } from 'react'
+import type { PropsWithChildren, ReactNode } from 'react'
 import type { FieldComponent } from './useField'
 import type { NoInfer } from '@tanstack/react-store'
 

From 10816f7ace36f0dc4386bc91469261e605ae39c6 Mon Sep 17 00:00:00 2001
From: Harry Whorlow <whorlowharry@gmail.com>
Date: Wed, 6 Aug 2025 11:51:04 +0200
Subject: [PATCH 2/2] stash: borked for now

---
 packages/form-core/src/FieldApi.ts        | 13 +++++++++++++
 packages/form-core/tests/FieldApi.spec.ts |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/packages/form-core/src/FieldApi.ts b/packages/form-core/src/FieldApi.ts
index 0bf59f58f..aee79be7a 100644
--- a/packages/form-core/src/FieldApi.ts
+++ b/packages/form-core/src/FieldApi.ts
@@ -1103,6 +1103,19 @@ export class FieldApi<
 
     this.update(this.options as never)
     const { onMount } = this.options.validators || {}
+    const formFieldMeta = this.form.getFieldMeta(this.name)
+    console.log(this.name)
+    console.log(formFieldMeta)
+
+    if (formFieldMeta && formFieldMeta.errors.length > 0) {
+      this.setMeta((prev) => ({
+        ...prev,
+
+        errorMap: formFieldMeta.errorMap,
+        errorSourceMap: formFieldMeta.errorSourceMap,
+        errors: formFieldMeta.errors,
+      }))
+    }
 
     if (onMount) {
       const error = this.runValidator({
diff --git a/packages/form-core/tests/FieldApi.spec.ts b/packages/form-core/tests/FieldApi.spec.ts
index e84579a24..95479e22c 100644
--- a/packages/form-core/tests/FieldApi.spec.ts
+++ b/packages/form-core/tests/FieldApi.spec.ts
@@ -2552,6 +2552,8 @@ describe('field api', () => {
     })
     fieldIndexed.mount()
 
+    expect(form.getFieldMeta(fieldIndexed.name)).toEqual([])
+
     expect(fieldIndexed.state.meta.errors).toStrictEqual({
       errors: [
         {