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    TypeScript 2.x for Angular Developers: Harness the capabilities of TypeScript to build cutting-edge web apps with Angular
    TypeScript 2.x for Angular Developers: Harness the capabilities of TypeScript to build cutting-edge web apps with Angular
    TypeScript 2.x for Angular Developers: Harness the capabilities of TypeScript to build cutting-edge web apps with Angular
    Ebook373 pages1 hour

    TypeScript 2.x for Angular Developers: Harness the capabilities of TypeScript to build cutting-edge web apps with Angular

    By Christian Nwamba

    ()

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    About this ebook

    Write better, reusable, and predictable Angular apps with typed logic

    About This Book
    • Leverage the power of TypeScript for developing large-scale Angular apps
    • Take advantage of the cutting-edge features of TypeScript 2.x to build high-performing, maintainable applications
    • Explore the TypeScript implementation of modules, classes, and annotations with Angular components
    Who This Book Is For

    This book is for developers who would like to learn to use TypeScript to develop Angular applications. A basic JavaScript knowledge would be beneficial.

    What You Will Learn
    • Move from loose types to predictable strict types
    • Write self-documented API methods and data structures
    • Understand custom generic types for complex data structures
    • Implement Contract with Interfaces
    • Enhance Dependency Injection in Angular via class constructors
    • Explore TypeScript advanced types
    • Build Interactive web apps with Angular and TypeScript
    In Detail

    TypeScript, a superset of JavaScript, is the default language for building Angular applications from Google. TypeScript 2.0 adds optional static types, classes, and modules to JavaScript, to enable great tooling and better structuring of large JavaScript applications.

    This book will teach you how to leverage the exciting features of TypeScript while working on Angular projects to build scalable, data-intensive web applications. You will begin by setting up and installing TypeScript and then compile it with JavaScript. You will then learn to write simple JavaScript expressions with TypeScript. You will then go through some built in TypeScript types and accessors. Further you will build web components using TypeScript Interfaces and Decorators. You will go through the Angular form module, which will enable you to write predictable typed forms with TypeScript and learn to use typed DOM events. You will also build a single-page application using the Router module. Lastly, you will consume API data with Angular's HTTP Module and handle responses with RxJS observables. At the end of the book, you will go through different testing and debugging techniques.

    Style and approach

    A step-by-step, tutorial-based guide

    LanguageEnglish
    PublisherPackt Publishing
    Release dateDec 7, 2017
    ISBN9781786464361
    TypeScript 2.x for Angular Developers: Harness the capabilities of TypeScript to build cutting-edge web apps with Angular

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      Book preview

      TypeScript 2.x for Angular Developers - Christian Nwamba

      TypeScript 2 for Angular Developers

      TypeScript 2.x for Angular Developers

      Harness the capabilities of TypeScript to build cutting-edge web apps with Angular

      Christian Nwamba

      BIRMINGHAM - MUMBAI

      TypeScript 2.x for Angular Developers

      Copyright © 2017 Packt Publishing

      All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

      Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author(s), nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

      Packt Publishing has endeavoured to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

      First published: December 2017

      Production reference: 1051217

      Published by Packt Publishing Ltd.

      Livery Place

      35 Livery Street

      Birmingham

      B3 2PB, UK.

      ISBN: 978-1-78646-055-4

      www.packtpub.com

      Credits

      About the Author

      Christian Nwamba is a Lagos, Nigeria-based full stack engineer, developer, and evangelist. He spends most of his life building user experiences with JavaScript and spreading the word to other developers through conferences, meetups, and technical articles.

      He has worked with quite a few interesting SaaS companies, such as Cloudinary, Pusher, and Auth0, and has published articles on popular blogs, such as Sitepoint, Scotch.io, Codementor, and Web Designer Depot. This is his first book and he's very proud of the effort he put in to make it enjoyable for the readers.

      He has a lot of interest in community building and efforts, especially in Africa. He does this by organizing and facilitating meetups/conferences (forLoop Africa, Angular Nigiera, GDGs, and more).

      Acknowledgments

      Before anything, I would like to express my sincere gratitude to my parents, Edwin Nwamba and Helen Nwamba, for nurturing and playing a huge role in my literary and technical upbringing. Their guidance gave me a great head start, which made all this possible.

      Besides my parents, I would also like to thank the Scotch, Cloudinary, and Packt teams for the continuous and unrestrained support they showed to me during my time writing this book. I couldn’t have asked for a better support in all sincerity.

      My sincere thanks also go to Chris Sevilleja, Nick Cerminara, and Prosper Otemuyiwa for challenging me to become even better at what I do and for their encouragement, insightful comments, and hard questions. Also, I thank Marcel Nwamadi and Olayinka Omole for contributing to the technical success of this work.

      I would like to thank Angular Nigeria and ForLoop Africa, two communities whose growth in recent times spurred me to carry on and not to relent in my efforts to make programming the mainstay in Africa.

      I thank my friends, William Imoh, Raphael Ugwu, Nnaemeka Ogbonnaya, and Chioma Imoh, for the stimulating discussions, the constant reminders and evaluations, and for being with me in good times and bad through the last five years.

      Last but not least, I would like to thank my siblings, Kelechi Nwamba, Ezinne Nwamba, Ekoma Nwamba, and Chioma Nwamba, for supporting me throughout my life.

      About the Reviewer

      Andrew Leith Macrae first cut his programming teeth on an Apple IIe, poking bytes into

      the RAM. Over the years, he has developed interactive applications with Hypercard,

      Director, Flash, and more recently, Adobe AIR for mobile. He has also worked with HTML

      since there was HTML to work with and is currently working as a senior frontend

      developer at The Learning Channel (www.tsc.ca), using Angular 4 with TypeScript.

      He is convinced that TypeScript is the future of JavaScript, bringing the structure and

      discipline of strongly typed object-oriented language to facilitate efficient, intentional

      coding for the development of large-scale applications for the web.

      You can find out more about Andrew or contact him at www.adventmedia.net.

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      Table of Contents

      Preface

      What this book covers

      What you need for this book

      Who this book is for

      Conventions

      Reader feedback

      Customer support

      Downloading the example code

      Downloading the color images of this book

      Errata

      Piracy

      Questions

      From Loose Types to Strict Types

      Term definitions

      Implications of loose types

      The problem

      Mitigating loose-type problems

      The typeof operator

      The toString method

      Final Note

      Summary

      Getting Started with TypeScript

      Setting up TypeScript

      Hello World

      Type annotation in TypeScript

      ES6 and beyond

      User story

      Final notes

      Summary

      Typescript Native Types and Features

      Basic types

      Strings

      Numbers

      Boolean

      Arrays

      Void

      Any

      Tuple

      Enums

      Functions and function types

      Function parameters

      Function return value

      Optional parameters

      Interfaces

      Interfaces for JavaScript object types

      Optional properties

      Read-only properties

      Interfaces as contracts

      Decorators

      Decorating methods

      Decorating classes

      Decorator factories

      Summary

      Up and Running with Angular and TypeScript

      Setting up Angular and TypeScript

      Creating a new Angular project

      Project structure

      Generating files

      Basics concepts

      Components

      Templates

      Component styles

      Modules

      Unit testing

      Summary

      Advanced Custom Components with TypeScript

      Lifecycle hooks

      DOM manipulation

      ElementRef

      Hooking into content initialization

      Handling DOM events

      View encapsulation

      Emulated

      Native

      None

      Summary

      Component Composition with TypeScript

      Component composability

      Hierarchical composition

      Component communication

      Parent-child flow

      Intercepting property changes

      Child–parent flow

      Accessing properties and methods of a child via a parent component

      Accessing child members with ViewChild

      Summary

      Separating Concerns with Typed Services

      Dependency injection

      Data in components

      Data class services

      Component interaction with services

      Services as utilities

      Summary

      Better Forms and Event Handling with TypeScript

      Creating types for forms

      The form module

      Two-way binding

      More form fields

      Validating the form and form fields

      Submitting forms

      Handling events

      Mouse events

      Keyboard events

      Summary

      Writing Modules, Directives, and Pipes with TypeScript

      Directives

      Attribute directives

      Handling events in directives

      Dynamic attribute directives

      Structural directives

      Why the difference?

      The deal with asterisks

      Creating structural directives

      Pipes

      Creating pipes

      Passing arguments to pipes

      Modules

      Summary

      Client-Side Routing for SPA

      RouterModule

      Router directives

      Master-details view with routes

      Data source

      Blog service

      Creating routes

      Listing posts in the home component

      Reading an article with the post component

      Summary

      Working with Real Hosted Data

      Observables

      The HTTP module

      Building a simple todo demo app

      Project setup

      Building the API

      Installing diskdb

      Updating API endpoints

      Creating an Angular component

      Creating application routes

      Creating a todos service

      Connecting the service with our todos component

      Implementing the view

      Build a user directory with Angular

      Create a new Angular app

      Create a Node server

      Install diskDB

      Create a new component

      Create a service

      Updating user.component.ts

      Updating user.component.html

      Running the app

      Summary

      Testing and Debugging

      Angular 2 testing tools

      Jasmine

      Main concepts of Jasmine

      Karma

      Protractor

      Angular testing platform

      Using Karma (with Jasmine)

      Creating a new project

      Installing the Karma CLI

      Configuring Karma

      Testing the components

      Testing services

      Testing using HTTP

      Testing using MockBackend

      Testing a directive

      Testing a pipe

      Debugging

      Augury

      Augury features

      Component tree

      Router tree

      Source map

      Summary

      Preface

      Deciding to learn Angular can be quite overwhelming. This is because the de facto way of writing an Angular app is by using a superset language, TypeScript, which is fairly new. Ironically, TypeScript simplifies how Angular apps are written by providing strict types (as seen in strictly typed languages such as Java), which improves the predictive behavior of the apps we write. This book is intended to assist you as a beginner/intermediate Angular developer with little or no knowledge of TypeScript or strict typing, in general, by explaining the core concepts of TypeScript.

      What this book covers

      Chapter 1, From Loose Types to Strict Types, discusses the problems developers faced before TypeScript was introduced, and what problems TypeScript solves. We will do this by discussing loose types and their challenges, and show some examples of how these challenges were being tackled previously and why TypeScript is a better choice.

      Chapter 2, Getting Started with Typescript, gives a summary of TypeScript's core concepts with practical examples on how to set up a vanilla JavaScript plus TypeScript project. All loosely typed examples in Chapter 1, From Loose Types to Strict Types, will be rewritten with TypeScript to demonstrate TypeScript's efficiency.

      Chapter 3, Typescript Native Types and Features, takes a deep dive into built-in TypeScript strict types that match existing JavaScript loose types. Each type will be discussed extensively with working examples, showing how it should be used and how it should work.

      Chapter 4, Up and Running with Angular and TypeScript, discusses how TypeScript applies to Angular. To do so, Angular needs to be up and running with the help of the CLI tool. In this chapter, we will discuss what it takes to have Angular and TypeScript work together. We will also cover the basic Angular concepts that you could find in a Hello World example.

      Chapter 5, Advanced Custom Components with TypeScript, discusses the concept of web components and how Angular builds on web components with TypeScript. We will see how to create components with classes, implement lifecycle hooks with TypeScript interfaces, and define components, metadetails using TypeScript decorators.

      Chapter 6, Component Composition with TypeScript, discusses how Angular is component-based. It explains that components are composed together as building blocks to make a fully functional app. We will discuss modularizing components using

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