javascript - Exporting class using ES6 syntax fails in Facebook Flow -

i want add flow type annotations class containing function defined in es6 style, below analyzed correctly:

/* @flow */ class product {   items: array<string>;    additem = (item:string) => {     this.items.push(item)   }; } 

if add export default export product class, get:

class property `additem` missing type annotation. 

it turns out had old version of flow installed globally @ 0.23.0, incompatible. upgrading flow 0.30.0 fixed issue.