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)

ts-node

The TypeScript community has developed an alternative version of Node.js that is able to work with TypeScript files as if it was natively supported. This alternative version of Node.js is known as ts-node.

The ts-node command allows us to execute TypeScript files without having to compile them first. We can execute a TypeScript file using the following command:

    ts-node ./src/main_server.ts  

The example application uses npm scripts to create a more convenient version of this command:

"scripts": { 
  "ts-node": "ts-node ./src/main_server.ts" 
} 

The npm command can be executed as follows:

    npm run ts-node  

By default, the ts-node command tries to find the compilation setting in the tsconfig.json file and expects it to be located in the current directory.

The ts-node command is a very convenient tool when we want to try something without...