deep-copy update private and public fields

package.json

@@ -3,16 +3,17 @@
   "description": "Tinode messenger for the web",
   "version": "0.15.12",
   "devDependencies": {
-    "@babel/core": "^7.1.2",
-    "@babel/preset-env": "^7.1.0",
+    "@babel/core": "^7.2.2",
+    "@babel/preset-env": "^7.3.1",
     "@babel/preset-react": "^7.0.0",
-    "babel-loader": "^8.0.4",
+    "babel-loader": "^8.0.5",
     "babel-plugin-react-intl": "^3.0.1",
     "browserslist": "^4.4.1",
-    "cssnano": "^4.0.5",
+    "cssnano": "^4.1.8",
     "postcss": "^7.0.6",
-    "webpack": "^4.23.1",
-    "webpack-cli": "^3.1.2"
+    "uglifyjs-webpack-plugin": "^2.1.1",
+    "webpack": "^4.29.0",
+    "webpack-cli": "^3.2.1"
   },
   "repository": {
     "type": "git",