Within your webpack configuration object, you'll need to add the babel-engine-plugin to the list of plugins.Module maintainers often only target Node.js and don't really care about browser support. Tools like Webpack allow you to easily bundle these modules and run them in the browser. But since Node.js 0.12 became deprecated, module maintainers started to leverage the new ES2016 features, for example fat-arrow functions. This becomes a problem because not all of these features are supported in the browser. Tools like UglifyJS doesn't like them either as it will fail with an Unexpected Token error.