Broccoli is the newest JavaScript-based build tool everyone's talking about. It helps you concatenate your scripts, compile your Sass files, and package up your ES6 modules—all while offering a concise declarative syntax, and blazing fast rebuilds. Building on that foundation, ember-cli is a project to bring an opinionated, Broccoli-based build stack to Ember developers, tuned with their specific needs in mind. Learn how to use Broccoli and ember-cli to define modern build workflows for your Ember applications, harnessing preprocessors such as Sass and CoffeeScript without losing sub-second rebuild times.