Is var { Route, Redirect, RouteHandler, Link } = Router; valid in Javascript?

What does this mean in Javascript ? I found this in react-router examples

var { Route, Redirect, RouteHandler, Link } = Router;

I get the following error when it is run through browserify.

"Uncaught SyntaxError: Unexpected token {"

https://github.com/rackt/react-router/blob/master/examples/dynamic-segments/app.js

Esprima also gives the same error: http://esprima.org/demo/validate.html