Added es build, which will get beneficial for es2015 modules aware bundlers like webpack 2+ and rollup

Author: Andarist

.babelrc

@@ -1,15 +1,5 @@
 {
   "presets": [
-    ["latest", {
-      "es2015": { "loose": true }
-    }],
-    "stage-2",
-    "react"
-  ],
-  "plugins": [
-    "dev-expression",
-    "add-module-exports",
-    "transform-object-assign",
-    ["transform-react-remove-prop-types", { "mode": "wrap" }]
+    "./.babelrc.js"
   ]
 }

.babelrc.js

@@ -0,0 +1,18 @@
+const modules = process.env.BABEL_ENV === 'es' ? false : 'commonjs'
+
+const presets = [
+  ['latest', {
+    es2015: { loose: true, modules }
+  }],
+  'stage-2',
+  'react'
+]
+
+const plugins = [
+  'dev-expression',
+  'add-module-exports',
+  'transform-object-assign',
+  ['transform-react-remove-prop-types', { mode: 'wrap' }]
+]
+
+module.exports = { plugins, presets }

package.json

@@ -3,11 +3,14 @@
   "version": "2.3.0-beta.0",
   "description": "A react component toolset for managing animations",
   "main": "lib/index.js",
+  "module": "es/index.js",
   "scripts": {
     "test": "npm run lint && npm run testonly",
     "testonly": "jest --verbose",
     "tdd": "jest --watch",
-    "build": "rimraf lib && babel src --out-dir lib && npm run build:dist && cp README.md LICENSE ./lib",
+    "build": "rimraf lib && npm run build:cjs && npm run build:es && npm run build:dist && cp README.md LICENSE ./lib",
+    "build:es": "cross-env BABEL_ENV=es babel src --out-dir lib/es",
+    "build:cjs": "cross-env BABEL_ENV=cjs babel src --out-dir lib",
     "build:dist": "rimraf lib/dist && webpack && NODE_ENV=production webpack -p",
     "lint": "eslint src test",
     "release": "release",
@@ -71,6 +74,7 @@
     "babel-preset-latest": "^6.24.0",
     "babel-preset-react": "^6.23.0",
     "babel-preset-stage-2": "^6.18.0",
+    "cross-env": "^5.0.1",
     "enzyme": "^3.0.0",
     "enzyme-adapter-react-16": "^1.0.0",
     "eslint": "^3.17.1",

src/index.js

@@ -1,12 +1,4 @@
-import CSSTransition from './CSSTransition';
-import ReplaceTransition from './ReplaceTransition';
-import TransitionGroup from './TransitionGroup';
-import Transition from './Transition';
-
-
-module.exports = {
-  Transition,
-  TransitionGroup,
-  ReplaceTransition,
-  CSSTransition,
-};
+export { default as CSSTransition } from './CSSTransition';
+export { default as ReplaceTransition } from './ReplaceTransition';
+export { default as TransitionGroup } from './TransitionGroup';
+export { default as Transition } from './Transition';