Function addDefaultField

packages/forms/signals/src/field/validation.ts:402–414

(
  errors: TreeValidationResult<E>,
  fieldTree: ReadonlyFieldTree<unknown>,
)

  fieldTree: ReadonlyFieldTree<unknown>,
): ValidationResult<E & {fieldTree: ReadonlyFieldTree<unknown>}>;
export function addDefaultField<E extends ValidationError>(
  errors: TreeValidationResult<E>,
  fieldTree: ReadonlyFieldTree<unknown>,
): ValidationResult<E & {fieldTree: ReadonlyFieldTree<unknown>}> {
  if (isArray(errors)) {
    for (const error of errors) {
      (error as ɵWritable<ValidationError.WithOptionalFieldTree>).fieldTree ??= fieldTree;
    }
  } else if (errors) {
    (errors as ɵWritable<ValidationError.WithOptionalFieldTree>).fieldTree ??= fieldTree;
  }
  return errors as ValidationResult<E & {fieldTree: ReadonlyFieldTree<unknown>}>;
}

function getFirstBoundElement(error: ValidationError.WithFieldTree) {
  if (error.formField) return error.formField.element;