Upgrade To Babel v7

package.json

@@ -19,20 +19,22 @@
   "license": "MIT",
   "dependencies": {},
   "devDependencies": {
+    "@babel/cli": "^7.4.4",
+    "@babel/core": "^7.4.5",
+    "@babel/plugin-proposal-class-properties": "^7.4.4",
+    "@babel/polyfill": "^7.4.4",
+    "@babel/preset-env": "^7.4.5",
+    "@babel/preset-react": "^7.0.0",
     "@google/clasp": "^1.7.0",
     "@types/google-apps-script": "0.0.26",
-    "babel-cli": "^6.26.0",
-    "babel-core": "^6.26.3",
-    "babel-eslint": "^8.2.6",
-    "babel-loader": "^7.1.5",
+    "babel-eslint": "^10.0.2",
+    "babel-loader": "^8.0.6",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-class-properties": "^6.24.1",
     "babel-plugin-transform-es3-member-expression-literals": "^6.22.0",
     "babel-plugin-transform-es3-property-literals": "^6.22.0",
     "babel-plugin-transform-object-assign": "^6.22.0",
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
-    "babel-preset-env": "^1.7.0",
-    "babel-preset-react": "^6.24.1",
     "clean-webpack-plugin": "^0.1.19",
     "copy-webpack-plugin": "^4.6.0",
     "css-loader": "^1.0.1",
@@ -41,6 +43,7 @@
     "eslint-config-prettier": "^2.9.0",
     "eslint-config-standard": "^11.0.0",
     "eslint-loader": "^2.1.2",
+    "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-googleappsscript": "^1.0.2",
     "eslint-plugin-import": "^2.17.3",
     "eslint-plugin-jsx-a11y": "^6.2.1",

src/client/.babelrc

@@ -1,3 +1,4 @@
 {
-  "presets": ["react"]
-}
+  "presets": ["@babel/react"],
+  "plugins": ["@babel/plugin-proposal-class-properties"]
+}

src/client/.eslintrc.json

@@ -1,8 +1,15 @@
 {
   "root": true,
   "parser": "babel-eslint",
-  "extends": ["plugin:react/recommended", "eslint:recommended", "google"],
-  "plugins": ["react"],
+  "extends": [
+    "plugin:react/recommended",
+    "eslint:recommended",
+    "google"
+  ],
+  "plugins": [
+    "babel",
+    "react"
+  ],
   "env": {
     "browser": true
   },
@@ -14,6 +21,12 @@
   "rules": {
     "import/prefer-default-export": 0,
     "no-console": 0,
-    "require-jsdoc" : 0
+    "require-jsdoc": 0,
+    "semi": [
+      2,
+      "never"
+    ],
+    "no-invalid-this": 0,
+    "babel/no-invalid-this": 1
   }
-}
+}

src/server/.babelrc

@@ -1,6 +1,6 @@
 {
     "presets": [
-        ["env", {
+        ["@babel/env", {
             "modules": false
         }]
     ],
@@ -11,4 +11,4 @@
         "transform-object-rest-spread",
         "transform-object-assign"
     ]
-}
+}