Add support for JSX-Fragments

[marvinhagemeister]

Prettier 1.8.2
Playground link

Input:

const Foo = <>
        <div>Hello World</div>
</>;

Output:

SyntaxError: Unexpected token (1:14)
> 1 | const Foo = <>
    |              ^
  2 |         <div>Hello World</div>
  3 | </>;
  4 | 

Expected behavior:

React 16.2.0 was just released with support for jsx fragments. These are currently not recognized by prettier and lead to syntax error.

Link to JSX-Fragments spec

[ikatyang]

There's already a WIP PR, see #3237.

[ikatyang]

Fixed in #3237.

[marvinhagemeister]

@ikatyang That's awesome! Much appreciated 👍