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.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

TypeScript Tools and Framework Options

TypeScript Tools and Framework Options

What is TypeScript?

TypeScript IDEs

Types, Variables, and Function Techniques

Types, Variables, and Function Techniques

Interfaces, Classes, and Inheritance

Interfaces, Classes, and Inheritance

Using interfaces, classes, and inheritance – the Factory Design Pattern

Decorators, Generics, and Asynchronous Features

Decorators, Generics, and Asynchronous Features

Advanced types with generics

Asynchronous language features

Declaration Files and Strict Compiler Options

Declaration Files and Strict Compiler Options

Global variables

Using JavaScript code blocks in HTML

Writing your own declaration file

Declaration syntax reference

Strict compiler options

Third-Party Libraries

Third-Party Libraries

Using definition files

Using npm and @types

Using third-party libraries

Inheritance – Angular 1 versus Backbone

TypeScript Compatible Frameworks

TypeScript Compatible Frameworks

Performance comparison

Test-Driven Development

Test-Driven Development

Test-driven development

Unit, integration, and acceptance tests

Unit testing frameworks

Jasmine runners

Using continuous integration

Testing Typescript Compatible Frameworks

Testing Typescript Compatible Frameworks

Testing our sample application

Backbone testing

Aurelia testing

Angular testing

Modularization

AMD module loading

SystemJS module loading

Using Express with Node

AWS Lambda functions

Object-Oriented Programming

Object-Oriented Programming

Object-oriented principles

User interface design

The State pattern

The Mediator pattern

Dependency Injection

Dependency Injection

Building a dependency injector

Decorator injection

Building Applications

Building Applications

Node and Angular integration

The UI experience

External authentication

Let's Get Our Hands Dirty

Let's Get Our Hands Dirty

Board Sales application

Database-driven APIs

The BoardSales application

The Domain Events design pattern

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Declaration Files and Strict Compiler Options

One of the most appealing facets of JavaScript development is the wealth of external JavaScript libraries that have already been published, such as jQuery, Knockout, Underscore, Lodash, or Moment. As we know, TypeScript generates JavaScript, so we can easily use JavaScript libraries in TypeScript. We have already seen how TypeScript uses syntactic sugar to enhance our JavaScript development experience by providing a strong typing mechanism. If we are using JavaScript libraries, however, how do we apply this sugar to existing JavaScript or JavaScript libraries? The answer is relatively simple—declaration files.

A declaration file is a special type of file used by the TypeScript compiler. It is marked with a .d.ts extension, and is then used by the TypeScript compiler within the compilation step. Declaration files are similar...