In the previous four chapters, we've walked through common and classical design patterns and discussed some of their variants in JavaScript or TypeScript. In this chapter, we'll continue with some architecture and patterns closely related to the language and their common applications. We don't have many pages to expand and certainly cannot cover everything in a single chapter, so please take it as an appetizer and feel free to explore more.

Many topics in this chapter are related to asynchronous programming. We'll start with a web architecture for Node.js that's based on Promise. This is a larger topic that has interesting ideas involved, including abstractions of responses and permissions, as well as error handling tips. Then we'll talk about how to organize modules with ECMAScript (ES) module syntax. And this chapter will end with several useful asynchronous techniques.

Overall, we'll have the following topics covered in...