Introduction
In the previous chapter, we learned about asynchronous programming using callbacks. With this knowledge, we can manage concurrent requests and write non-blocking code that allows our applications to render web pages faster or serve concurrent requests on a Node.js server.
In this chapter, we will learn how promises allow us to write more readable, concise code to better manage asynchronous processes and forever escape deep callback nesting, sometimes known as "callback hell." We will explore the evolution of the Promise object and how it eventually became part of the JavaScript language. We'll look at different transpilation targets for TypeScript and how TypeScript can enhance promises and allow developers to leverage generics to infer return types.
We will work on some practical exercises, such as managing multiple API requests from a website and managing concurrency in Node.js. We will use the Node.js FileSystem API to perform asynchronous operations...