Version 2.0.0 breaks karma test runner

[mikkelwf]

I think its because phantomjs (2.1.1) only support ES5, and not ES6...

[sindresorhus]

This module mainly targets Node.js, not the browser or PhantomJS. It's up to you to transpile it with Babel if you want to use it in the browser. You can find a more detailed explanation here: sindresorhus/ama#446

If you use Webpack, check out babel-engine-plugin, which transpiles only the dependencies that needs to be transpiled.