Webpack 2
Unofficial docs by Drew Powers (official docs located at webpack.js.org).
What is Webpack?
Webpack is a bundler for all your front-end code. It’s a task runner + tree shaker + file splitter + optimizer, all in one.
Webpack does things in a different way than you might be used to. It’s a steep learning curve up front for much saved time down the line. You can get started with a simple example or browse the complete API.
Also be sure to check out the following example projects: