As not everything that's worth discussing fits into the main content, you can find related material in brief appendices. These support the primary content and explain specific topics, such as Hot Module Replacement, in greater detail. You will also learn to troubleshoot webpack.
This book is available through Leanpub (digital), Amazon (paperback), and Kindle (digital). By purchasing the book you support the development of further content. A part of profit (~30%) goes to Tobias Koppers, the author of webpack.