docs: fix vue example

examples/nuxt-example/components/ui/form/useFormField.ts

@@ -0,0 +1,30 @@
+import { FieldContextKey, useFieldError, useIsFieldDirty, useIsFieldTouched, useIsFieldValid } from 'vee-validate'
+import { inject } from 'vue'
+import { FORM_ITEM_INJECTION_KEY } from './injectionKeys'
+
+export function useFormField() {
+  const fieldContext = inject(FieldContextKey)
+  const fieldItemContext = inject(FORM_ITEM_INJECTION_KEY)
+
+  if (!fieldContext)
+    throw new Error('useFormField should be used within <FormField>')
+
+  const { name } = fieldContext
+  const id = fieldItemContext
+
+  const fieldState = {
+    valid: useIsFieldValid(name),
+    isDirty: useIsFieldDirty(name),
+    isTouched: useIsFieldTouched(name),
+    error: useFieldError(name),
+  }
+
+  return {
+    id,
+    name,
+    formItemId: `${id}-form-item`,
+    formDescriptionId: `${id}-form-item-description`,
+    formMessageId: `${id}-form-item-message`,
+    ...fieldState,
+  }
+}