Babel 7 (#23966)

* use .babelrc.js, compile bundled/non-bundled with loose mode

* add back helper, exclude typeof transform

.babelrc

@@ -1,12 +0,0 @@
-{
-  "presets": [
-    [
-      "es2015",
-      {
-        "loose": true,
-        "modules": false
-      }
-    ]
-  ],
-  "plugins": ["external-helpers"]
-}

.babelrc.js

@@ -0,0 +1,16 @@
+module.exports = {
+  presets: [
+    [
+      'env',
+      {
+        loose: true,
+        modules: false,
+        exclude: ['transform-es2015-typeof-symbol']
+      }
+    ]
+  ],
+  plugins: [
+    process.env.ROLLUP && 'external-helpers',
+    process.env.PLUGINS && 'transform-es2015-modules-strip',
+  ].filter(Boolean)
+};

build/rollup.config.js

@@ -11,11 +11,9 @@ const plugins = [
   babel({
     exclude: 'node_modules/**', // only transpile our source code
     externalHelpersWhitelist: [ // include only required helpers
-      'typeof',
-      'classCallCheck',
+      'defineProperties',
       'createClass',
-      'inherits',
-      'possibleConstructorReturn'
+      'inheritsLoose'
     ]
   })
 ]

package.json

@@ -33,9 +33,9 @@
     "js-lint": "eslint js/ && eslint --config js/tests/.eslintrc.json --env node build/ Gruntfile.js",
     "js-lint-docs": "eslint --config js/tests/.eslintrc.json assets/js/ sw.js",
     "js-compile": "npm-run-all --parallel js-compile-*",
-    "js-compile-standalone": "rollup --environment BUNDLE:false --config build/rollup.config.js",
-    "js-compile-bundle": "rollup --environment BUNDLE:true --config build/rollup.config.js",
-    "js-compile-plugins": "babel --no-babelrc js/src/ --out-dir js/dist/ --source-maps --presets=es2015 --plugins=transform-es2015-modules-strip",
+    "js-compile-standalone": "ROLLUP=true rollup --environment BUNDLE:false --config build/rollup.config.js",
+    "js-compile-bundle": "ROLLUP=true rollup --environment BUNDLE:true --config build/rollup.config.js",
+    "js-compile-plugins": "PLUGINS=true babel js/src/ --out-dir js/dist/ --source-maps",
     "js-minify": "npm-run-all --parallel js-minify-standalone js-minify-bundle",
     "js-minify-standalone": "uglifyjs --config-file build/uglifyjs.config.json --output dist/js/bootstrap.min.js dist/js/bootstrap.js",
     "js-minify-bundle": "uglifyjs --config-file build/uglifyjs.config.json --output dist/js/bootstrap.bundle.min.js dist/js/bootstrap.bundle.js",
@@ -76,11 +76,11 @@
   },
   "devDependencies": {
     "autoprefixer": "^7.1.2",
-    "babel-cli": "^6.24.1",
+    "babel-cli": "7.0.0-beta.0",
     "babel-eslint": "^8.0.0",
-    "babel-plugin-external-helpers": "^6.22.0",
+    "babel-plugin-external-helpers": "7.0.0-beta.0",
     "babel-plugin-transform-es2015-modules-strip": "^0.1.1",
-    "babel-preset-es2015": "^6.24.1",
+    "babel-preset-env": "2.0.0-beta.0",
     "clean-css-cli": "^4.1.6",
     "eslint": "^4.2.0",
     "grunt": "^1.0.1",
@@ -95,7 +95,7 @@
     "postcss-cli": "^4.1.0",
     "qunit-phantomjs-runner": "^2.3.0",
     "qunitjs": "^2.4.0",
-    "rollup": "^0.49.2",
+    "rollup": "^0.50.0",
     "rollup-plugin-babel": "^3.0.2",
     "rollup-plugin-node-resolve": "^3.0.0",
     "shelljs": "^0.7.8",