[improvement] rename packages dir to src (#3659)

src/utils/deep-clone.ts

@@ -0,0 +1,13 @@
+import { deepAssign } from './deep-assign';
+
+export function deepClone(obj: object): object {
+  if (Array.isArray(obj)) {
+    return obj.map(item => deepClone(item));
+  }
+
+  if (typeof obj === 'object') {
+    return deepAssign({}, obj);
+  }
+
+  return obj;
+}