The project in question is using React-16.2.0 which has the capability to use Fragments and the Fragment shorthand.
https://reactjs.org/blog/2017/11/28/react-v16.2.0
You can use the poor man's fragment shorthand as a quick fix: [
,
]
render(){
return [
<div>foo</div>,
<div>bar</div>
]
}
as array is totally a valid jsx element.
Fragment syntax is only supported by Babel v7.0.0-beta.31 & above.
I think this is a reason:
https://reactjs.org/blog/2017/11/28/react-v16.2.0-fragment-support.html#support-for-fragment-syntax
screenshot
create-react-apps currently use Babel 6.26.0 for full support React.Fragment is needed Babel v7.0.0-beta.31 and above
======================= EDIT
It's working now with create-react-app v2 https://reactjs.org/blog/2018/10/01/create-react-app-v2.html