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

Strict compiler options

The TypeScript compiler allows for the configuration of a number of compiler options. These options can be grouped into five main groups, as follows:

  • Basic options
  • Strict type-checking options
  • Module resolution options
  • Source map options
  • Experimental options

We have already been exposed to a few of these options, including the use of source maps, and the experimental options related to decorators. In this section, however, we will focus on the strict type-checking options that affect the way that we write our TypeScript code. These options provide us with a compile-time check to ensure that we are not breaking certain basic TypeScript rules, and help us to write more hardened code. Specifically, we will focus on the following options:

  • noImplicitAny
  • strictNullChecks
  • strictPropertyInitialization
  • noImplicitThis
  • noUnusedLocals
  • noUnusedParameters
  • noImplicitReturns...