feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/common/chat-area/utils/__tests__/update-only-defined.test.ts

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { expect, it, vi } from 'vitest';
+
+import { updateOnlyDefined } from '../src/update-only-defined';
+
+it('update only defined', () => {
+  const updater = vi.fn();
+  updateOnlyDefined(updater, {
+    a: undefined,
+    b: 1,
+  });
+  expect(updater.mock.calls[0][0]).toMatchObject({
+    b: 1,
+  });
+});
+
+it('do not run updater if item value is only undefined', () => {
+  const updater = vi.fn();
+  updateOnlyDefined(updater, {
+    a: undefined,
+    b: undefined,
+  });
+  expect(updater.mock.calls.length).toBe(0);
+});