Book Image

Mastering TypeScript - Fourth Edition

By : Nathan Rozentals
4.7 (3)
Book Image

Mastering TypeScript - Fourth Edition

4.7 (3)
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)
17
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18
Index

Summary

In this chapter, we took a look at the various strict compiler options available within the TypeScript compiler. We started with an example of nested configuration, where a tsconfig.json file can reference another one as a base. We then discussed four strict options that check our code base for possible errors, by detecting null variables, properties that have not been initialized, parameter types when using bind, call, or apply, and strict function types. We then went through the no compiler options, which help us to identify variables that could be of type any, unused variables, implicit returns, switch case errors, and incorrect scoping of this.

It is best practice for any new TypeScript project to leave the default strict option set to true. This will ensure that all of the options we have discussed will always be on and will help to trap a large portion of possible errors within our code. The only time that we should really be modifying these options is if we are...