Unfortunately import statements does not work like object destructuring. Curly braces here mean that you want to import token with this name but not property of default export. Look at this pairs of import/export:

 //module.js

 export default 'A';

 export var B = 'B';



 //script.js

 import A from './a.js';  //import value on default export

 import {B} from './a.js'; // import value by its name

 console.log(A, B); // 'A', 'B'

For your case you can import whole object and make a destructuring assignment

 import addons from react/addons;

 let {addons: {PureRenderMixin}} = addons;