use loose mode in all babel compilations

Author: yyx990803

build/webpack.dev.config.js

@@ -11,7 +11,7 @@ module.exports = {
       {
         test: /.js/,
         exclude: /node_modules/,
-        loader: 'babel?optional[]=runtime'
+        loader: 'babel?optional[]=runtime&loose=true'
       }
     ]
   },

example/advanced/webpack.config.js

@@ -19,7 +19,7 @@ module.exports = {
       {
         test: /\.js$/,
         exclude: /node_modules|vue\/src/,
-        loader: 'babel?optional[]=runtime'
+        loader: 'babel?optional[]=runtime&loose=true'
       }
     ]
   },

package.json

@@ -7,7 +7,7 @@
     "dev": "npm run serve & npm run serve-test & webpack --watch --config build/webpack.dev.config.js",
     "lint": "eslint src build test/e2e test/unit/specs",
     "unit": "./node_modules/karma/bin/karma start build/karma.config.js",
-    "build": "babel ./src --optional runtime --out-dir lib && webpack --config build/webpack.build.dev.config.js && webpack --config build/webpack.build.min.config.js",
+    "build": "babel ./src --loose --optional runtime --out-dir lib && webpack --config build/webpack.build.dev.config.js && webpack --config build/webpack.build.min.config.js",
     "serve": "webpack-dev-server --hot --config example/advanced/webpack.config.js --content-base example/advanced --history-api-fallback --host 0.0.0.0",
     "serve-test": "webpack-dev-server --quiet --config test/unit/webpack.config.js --content-base test/unit --history-api-fallback --host 0.0.0.0 --port 8081",
     "e2e-sauce": "nightwatch -c build/nightwatch.sauce.json -e chrome,firefox,ie10,ie11",

test/unit/webpack.config.js

@@ -9,7 +9,7 @@ module.exports = {
       {
         test: /\.js$/,
         exclude: /test|node_modules|vue\/src/,
-        loader: 'babel?optional[]=runtime'
+        loader: 'babel?optional[]=runtime&loose=true'
       }
     ]
   }