Book Image

Learning TypeScript 2.x - Second Edition

By : Remo H. Jansen
Book Image

Learning TypeScript 2.x - Second Edition

By: Remo H. Jansen

Overview of this book

TypeScript is an open source and cross-platform statically typed superset of JavaScript that compiles to plain JavaScript and runs in any browser or host. This book is a step-by-step guide that will take you through the use and benefits of TypeScript with the help of practical examples. You will start off by understanding the basics as well as the new features of TypeScript 2.x. Then, you will learn how to work with functions and asynchronous programming APIs. You will continue by learning how to resolve runtime issues and how to implement TypeScript applications using the Object-oriented programming (OOP) and functional programming (FP) paradigms. Later, you will automate your development workflow with the help of tools such as Webpack. Towards the end of this book, you will delve into some real-world scenarios by implementing some full-stack TypeScript applications with Node.js, React and Angular as well as how to optimize and test them. Finally, you will be introduced to the internal APIs of the TypeScript compiler, and you will learn how to create custom code analysis tools.
Table of Contents (17 chapters)

Implementing a yUML compiler

In this section, we are going to put together everything that we have learned so far during this chapter to create a custom developer tool. We are going to write a tool that takes TypeScript source code as input and generates a unified modeling language (UML) class diagram. A class diagram describes the structure of a system by showing the system's classes, their attributes, methods, and the relationships among the objects.

A class diagram looks as follows:

We are going to use the TypeScript compiler API and ts-simple-ast to traverse the AST generated by the sample application included in the companion source code. We will then emit some code in a domain-specific language (DSL) known as yUML. Finally, we will post the yUML DSL to an online service to generate the diagram as an image. We are going to translate from TypeScript to yUML, which means...