fix: fix nesting issue due to the errors order

Author: volodymyr-kushnir

src/__tests__/__snapshots__/toNestErrors.ts.snap

@@ -3,6 +3,11 @@
 exports[`transforms flat object to nested object 1`] = `
 {
   "name": {
+    "firstName": {
+      "message": "third message",
+      "ref": undefined,
+      "type": "rd",
+    },
     "message": "first message",
     "ref": {
       "reportValidity": [MockFunction spy],
@@ -25,6 +30,11 @@ exports[`transforms flat object to nested object 1`] = `
 exports[`transforms flat object to nested object and shouldUseNativeValidation: true 1`] = `
 {
   "name": {
+    "firstName": {
+      "message": "third message",
+      "ref": undefined,
+      "type": "rd",
+    },
     "message": "first message",
     "ref": {
       "reportValidity": [MockFunction spy] {

src/__tests__/toNestErrors.ts

@@ -3,6 +3,7 @@ import { toNestErrors } from '../toNestErrors';
 
 const flatObject: Record<string, FieldError> = {
   name: { type: 'st', message: 'first message' },
+  'name.firstName': { type: 'rd', message: 'third message' },
   'test.0.name': { type: 'nd', message: 'second message' },
 };
 

src/toNestErrors.ts

@@ -14,24 +14,28 @@ export const toNestErrors = <TFieldValues extends FieldValues>(
   options: ResolverOptions<TFieldValues>,
 ): FieldErrors<TFieldValues> => {
   options.shouldUseNativeValidation && validateFieldsNatively(errors, options);
-
   const fieldErrors = {} as FieldErrors<TFieldValues>;
   for (const path in errors) {
     const field = get(options.fields, path) as Field['_f'] | undefined;
-    const error = Object.assign(errors[path] || {}, {
-      ref: field && field.ref,
-    });
-
     if (isNameInFieldArray(options.names || Object.keys(errors), path)) {
-      const fieldArrayErrors = Object.assign({}, get(fieldErrors, path));
-
+      const fieldArrayErrors = Object.assign(
+        {},
+        structuredClone(get(fieldErrors, path)),
+      );
+      const error = Object.assign(structuredClone(errors[path]) || {}, {
+        ref: field && field.ref,
+      });
       set(fieldArrayErrors, 'root', error);
       set(fieldErrors, path, fieldArrayErrors);
     } else {
+      const error = Object.assign(
+        structuredClone(errors[path]) || {},
+        structuredClone(get(fieldErrors, path)),
+        { ref: field && field.ref },
+      );
       set(fieldErrors, path, error);
     }
   }
-
   return fieldErrors;
 };