Update Babel config (#3703)

* Update Babel config

* Update for Babel 6.13.2

* Lint all the things

* __DEV__ is a non-writable global

Author: taion

.babelrc

@@ -1,17 +1,16 @@
 {
-  "presets": ["react"],
+  "presets": [
+    "./tools/es2015Preset",
+    "stage-1",
+    "react"
+  ],
   "plugins": ["dev-expression"],
 
   "env": {
     "cjs": {
-      "presets": ["es2015-loose", "stage-1"],
       "plugins": ["add-module-exports"]
     },
-    "es": {
-      "presets": ["es2015-loose-native-modules", "stage-1"]
-    },
     "test": {
-      "presets": ["es2015-loose", "stage-1"],
       "plugins": ["istanbul"]
     }
   }

.eslintrc

@@ -1,7 +1,7 @@
 {
   "extends": ["rackt", "plugin:react/recommended"],
   "globals": {
-    "__DEV__": true
+    "__DEV__": false
   },
   "rules": {
     "react/display-name": 0,

package.json

@@ -18,10 +18,10 @@
     "build": "npm run build-cjs && npm run build-es",
     "build-cjs": "rimraf lib && cross-env BABEL_ENV=cjs babel ./modules -d lib --ignore '__tests__'",
     "build-es": "rimraf es6 && cross-env BABEL_ENV=es babel ./modules -d es6 --ignore '__tests__'",
-    "build-umd": "cross-env BABEL_ENV=cjs NODE_ENV=development webpack modules/index.js umd/ReactRouter.js",
-    "build-min": "cross-env BABEL_ENV=cjs NODE_ENV=production webpack -p modules/index.js umd/ReactRouter.min.js",
-    "lint": "eslint modules examples *.js",
-    "start": "cross-env BABEL_ENV=cjs node examples/server.js",
+    "build-umd": "cross-env NODE_ENV=development webpack modules/index.js umd/ReactRouter.js",
+    "build-min": "cross-env NODE_ENV=production webpack -p modules/index.js umd/ReactRouter.min.js",
+    "lint": "eslint examples modules scripts tools *.js",
+    "start": "node examples/server.js",
     "test": "npm run lint && npm run test-node && npm run test-browser",
     "test-browser": "cross-env NODE_ENV=test karma start",
     "test-node": "cross-env NODE_ENV=test mocha --compilers js:babel-register tests.node.js"
@@ -43,17 +43,15 @@
   },
   "devDependencies": {
     "babel-cli": "^6.11.4",
-    "babel-core": "^6.11.4",
+    "babel-core": "^6.13.2",
     "babel-eslint": "^6.1.2",
     "babel-loader": "^6.2.4",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-dev-expression": "^0.2.1",
     "babel-plugin-istanbul": "^1.0.3",
-    "babel-preset-es2015": "^6.9.0",
-    "babel-preset-es2015-loose": "^7.0.0",
-    "babel-preset-es2015-loose-native-modules": "^1.0.0",
+    "babel-preset-es2015": "^6.13.2",
     "babel-preset-react": "^6.11.1",
-    "babel-preset-stage-1": "^6.5.0",
+    "babel-preset-stage-1": "^6.13.0",
     "babel-register": "^6.11.6",
     "bundle-loader": "^0.5.4",
     "codecov": "^1.0.1",

scripts/build.js

@@ -1,10 +1,12 @@
-var execSync = require('child_process').execSync
-var readFileSync = require('fs').readFileSync
-var prettyBytes = require('pretty-bytes')
-var gzipSize = require('gzip-size')
+/* eslint-disable no-console */
+
+const execSync = require('child_process').execSync
+const readFileSync = require('fs').readFileSync
+const prettyBytes = require('pretty-bytes')
+const gzipSize = require('gzip-size')
 
 function exec(command) {
-  execSync(command, { stdio: [0, 1, 2] })
+  execSync(command, { stdio: [ 0, 1, 2 ] })
 }
 
 exec('npm run build')

tools/es2015Preset.js

@@ -0,0 +1,12 @@
+const { buildPreset } = require('babel-preset-es2015')
+
+const { BABEL_ENV } = process.env
+
+module.exports = {
+  presets: [
+    [ buildPreset, {
+      loose: true,
+      modules: BABEL_ENV === 'es' ? false : 'commonjs'
+    } ]
+  ]
+}