The NextJS module added and the error in index.js solved.

Author: radi-cho

example/.gitignore

@@ -1 +1,2 @@
 node_modules/
+.next

example/imports/rsg-components.js

@@ -9,6 +9,7 @@
   "dependencies": {
     "aphrodite-jss": "^1.1.1",
     "lodash": "^4.17.4",
+    "next": "^5.0.0",
     "react": "^16.2.0",
     "react-dom": "^16.2.0"
   },

example/imports/rsg-components.js.map

@@ -36,8 +36,7 @@ export default class Index extends Component {
     super()
     this.state = { username: '', password: '', checked: false }
   }
-
-  render = () => {
+  render () {
     const string = `Username in state: ${this.state.username}
 Password in state: ${this.state.password}
 Is RSGCheckbox checked: ${this.state.checked}`