Mastering Modular JavaScript

Today I was having a look around for best practices for defining JavaScript modules. In that search, I came across the book Mastering Modular JavaScript. This book offers a good selection of best practices for JS module development. Also, all chapters are freely available on GitHub:

• Chapter 1: Module Thinking
• Chapter 2: Modularity Principles
• Chapter 3: Module Design
• Chapter 4: Shaping Internals
• Chapter 5: Modular Patterns and Practices
• Chapter 6: Development Methodology and Philosophy

For a more basic introduction to modules, see the chapter JavaScript Modules from the book Practical Modern JavaScript.