I found this while using prettier 1.1.0.

Input Code

const identity = <T>(t: T): T => t;
const a = 1;

Babylon/Babel Configuration

{
  plugins: ['jsx', 'flow']
}

Expected Behavior

The code is valid and babylon should be able to parse it.

Current Behavior

babylon throws Unexpected token (2:0). You can see it live on the prettier playground.

Removing the jsx plugin and only enabling the flow one makes babylon able to parse the code correctly.

Your Environment