feat: upgrade babel to 7.0.0 (#3814)

package.json

@@ -70,11 +70,11 @@
     "npm": ">=5.0.0"
   },
   "dependencies": {
-    "@babel/core": "7.0.0-rc.2",
-    "@nuxtjs/babel-preset-app": "0.4.0",
+    "@babel/core": "^7.0.0",
+    "@nuxtjs/babel-preset-app": "^0.5.0",
     "@nuxtjs/friendly-errors-webpack-plugin": "^2.0.2",
     "@nuxtjs/youch": "^4.2.3",
-    "babel-loader": "^8.0.0-beta.6",
+    "babel-loader": "^8.0.0",
     "cache-loader": "^1.2.2",
     "caniuse-lite": "^1.0.30000878",
     "chalk": "^2.4.1",
@@ -136,11 +136,10 @@
     "webpackbar": "^2.6.3"
   },
   "devDependencies": {
-    "@babel/plugin-external-helpers": "7.0.0-rc.2",
-    "@babel/polyfill": "7.0.0-rc.2",
-    "@babel/preset-env": "7.0.0-rc.2",
+    "@babel/polyfill": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
     "babel-core": "^7.0.0-0",
-    "babel-eslint": "^9.0.0-beta",
+    "babel-eslint": "^9.0.0",
     "babel-jest": "^23.4.2",
     "babel-plugin-dynamic-import-node": "^2.0.0",
     "codecov": "^3.0.4",
@@ -168,7 +167,7 @@
     "request-promise-native": "^1.0.5",
     "rimraf": "^2.6.2",
     "rollup": "^0.64.1",
-    "rollup-plugin-babel": "^4.0.0-beta.8",
+    "rollup-plugin-babel": "^4.0.2",
     "rollup-plugin-commonjs": "^9.1.5",
     "rollup-plugin-json": "^3.0.0",
     "rollup-plugin-license": "^0.7.0"

scripts/rollup/nuxt-legacy.js

@@ -15,9 +15,6 @@ export default config({
             'modules': false
           }
         ]
-      ],
-      plugins: [
-        '@babel/external-helpers'
       ]
     })
   ]