Update npm packages & add optional chaining

.babelrc

@@ -1,5 +1,6 @@
 {
   "plugins": [
+    "@babel/plugin-proposal-optional-chaining"
   ],
   "presets": [
     ["@babel/preset-env", {

package.json

@@ -29,30 +29,30 @@
     "@types/core-js": "^2.5.0",
     "@types/es6-promise": "^3.3.0",
     "fs-extra": "^7.0.1",
-    "vue": "^2.5.17",
-    "vuex": "^3.0.1",
-    "vuex-webextensions": "^1.2.6"
+    "vue": "^2.6.11",
+    "vuex": "^3.1.2",
+    "vuex-webextensions": "^1.3.0"
   },
   "devDependencies": {
-    "@babel/core": "^7.1.2",
-    "@babel/plugin-proposal-optional-chaining": "^7.0.0",
-    "@babel/preset-env": "^7.1.0",
+    "@babel/core": "^7.8.3",
+    "@babel/plugin-proposal-optional-chaining": "^7.8.3",
+    "@babel/preset-env": "^7.8.3",
     "archiver": "^3.0.0",
-    "babel-loader": "^8.0.2",
+    "babel-loader": "^8.0.6",
     "copy-webpack-plugin": "^4.5.3",
     "cross-env": "^5.2.0",
     "css-loader": "^0.28.11",
-    "ejs": "^2.6.1",
+    "ejs": "^2.7.4",
     "file-loader": "^1.1.11",
     "mini-css-extract-plugin": "^0.4.4",
-    "node-sass": "^4.9.3",
+    "node-sass": "^4.13.1",
     "sass-loader": "^7.1.0",
-    "vue-loader": "^15.4.2",
-    "vue-template-compiler": "^2.5.17",
+    "vue-loader": "^15.8.3",
+    "vue-template-compiler": "^2.6.11",
     "web-ext-types": "^2.1.0",
-    "webpack": "^4.20.2",
+    "webpack": "^4.41.5",
     "webpack-chrome-extension-reloader": "^0.8.3",
-    "webpack-cli": "^3.1.2",
+    "webpack-cli": "^3.3.10",
     "webpack-shell-plugin": "^0.5.0"
   }
 }

webpack.config.js

@@ -60,6 +60,11 @@ const config = {
           name: '[path][name].[ext]',
         },
       },
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        loader: "babel-loader"
+      },
     ],
   },
   plugins: [