Book Image

Mastering TypeScript 3 - Third Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript 3 - Third Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript. It was designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Starting with an introduction to the TypeScript language, before moving on to basic concepts, each section builds on previous knowledge in an incremental and easy-to-understand way. Advanced and powerful language features are all covered, including asynchronous programming techniques, decorators, and generics. This book explores many modern JavaScript and TypeScript frameworks side by side in order for the reader to learn their respective strengths and weaknesses. It will also thoroughly explore unit and integration testing for each framework. Best-of-breed applications utilize well-known design patterns in order to be scalable, maintainable, and testable. This book explores some of these object-oriented techniques and patterns, and shows real-world implementations. By the end of the book, you will have built a comprehensive, end-to-end web application to show how TypeScript language features, design patterns, and industry best practices can be brought together in a real-world scenario.
Table of Contents (16 chapters)
Free Chapter
TypeScript Tools and Framework Options


In this chapter, we have outlined what we need to know in order to write and use our own declaration files. We discussed JavaScript global variables in rendered HTML and how to access them in TypeScript. We then moved on to a small JavaScript helper function and wrote our own declaration file for this JavaScript. We then listed a few module definition rules, highlighting the required JavaScript syntax, and showing what the equivalent TypeScript declaration syntax would be.

In the second section of the chapter, we looked at the strict options of the TypeScript compiler, and compared the code with and without each of these options.

In the next chapter, we will look at how to use existing third-party JavaScript libraries, and how to import existing declaration files for these libraries into your TypeScript projects.