Book Image

Mastering TypeScript - Fourth Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript - Fourth Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript, designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Mastering Typescript is a golden standard for budding and experienced developers. With a structured approach that will get you up and running with Typescript quickly, this book will introduce core concepts, then build on them to help you understand (and apply) the more advanced language features. You’ll learn by doing while acquiring the best programming practices along the way. This fourth edition also covers a variety of modern JavaScript and TypeScript frameworks, comparing their strengths and weaknesses. You'll explore Angular, React, Vue, RxJs, Express, NodeJS, and others. You'll get up to speed with unit and integration testing, data transformation, serverless technologies, and asynchronous programming. Next, you’ll learn how to integrate with existing JavaScript libraries, control your compiler options, and use decorators and generics. By the end of the book, you will have built a comprehensive set of web applications, having integrated them into a single cohesive website using micro front-end techniques. This book is about learning the language, understanding when to apply its features, and selecting the framework that fits your real-world project perfectly.
Table of Contents (19 chapters)
Other Books You May Enjoy

Strict Compiler Options

The TypeScript compiler uses the tsconfig.json file to specify a number of compilation options. These options include what version of JavaScript we would like to generate for, what the output directory should be, and whether or not to allow JavaScript source files within the project directory. We have already discussed a few of these compiler options on our journey with TypeScript so far.

One of the most important options is simply named strict, and this single option turns on a group of other compiler options. The purpose of the strict compiler options is to apply a number of checks to our code and determine whether any of these checks fail. As an example, these strict options can determine if a variable could be undefined at the time of use, or if the variable itself is never used. If we set the value of the strict option to false, or turn it off, then each of these options needs to be turned on individually. In this chapter, we will explore these other...