Angular Design Patterns and Best Practices: Create scalable and adaptable applications that grow to meet evolving user needs

Cover....1

Title Page....2

Copyright and Credits....3

Foreword....5

Contributors....7

Table of Contents....10

Preface....16

Part 1: Reinforcing the Foundations....22

Chapter 1: Starting Projects the Right Way....24

Technical requirements....24

Why choose Angular?....25

Batteries included....25

Google support....25

Community....25

Tooling....26

What technologies are present in the ecosystem?....26

TypeScript....26

RXJS....27

Karma and Jasmine....27

Webpack....27

Configuring your development environment....28

VS Code....28

VS Code settings....30

Fira Code font and ligatures....30

Standardizing the extensions and settings in the project....31

Angular DevTools....32

Starting an Angular project....33

Project structure....36

Using the Angular CLI for your productivity....37

ng add....37

ng update....38

ng serve....38

ng build....39

ng deploy....39

ng generate....39

Summary....40

Chapter 2: Organizing Your Application....42

Technical requirements....42

Organizing the application with Angular modules....43

declarations....43

providers....44

imports....44

exports....44

The first module – AppModule....45

What is the difference between Angular and JavaScript modules?....45

Modules type....46

Avoiding anti-pattern – single module app....50

Optimizing the usage of common modules – the SharedModule pattern....51

Improving the size of your app – lazy loading....53

Summary....57

Chapter 3: TypeScript Patterns for Angular....58

Technical requirements....58

Creating classes and types....59

Primitive and basic types....59

Classes....61

Interfaces....64

Type aliases....66

When to use classes, interfaces, or types....67

Creating methods and functions....68

Working with null values....69

Decreasing verbosity – type inference....70

Validating types – type guards....71

Using a better alternative to the any type....73

Summary....75

Chapter 4: Components and Pages....76

Technical requirements....76

Creating components....77

Communication between components – inputs and outputs....81

Best practice – using the TrackBy property....84

Separating responsibilities – Smart and Presentation components....86

Communication from the child component – using @Output....89

Propagating events from nested components....91

Summary....95

Chapter 5: Angular Services and the Singleton Pattern....96

Technical requirements....96

Creating services....97

Understanding the dependency injection pattern....99

Using the inject() function....101

Communication between components using services....101

REST API consumption....104

Summary....108

Part 2: Leveraging Angular’s Capabilities....110

Chapter 6: Handling User Inputs: Forms....112

Technical requirements....112

Template-driven forms....113

Reactive forms....118

Data validation....122

Custom validations....125

Typed reactive forms....128

Summary....129

Chapter 7: Routes and Routers....130

Technical requirements....130

Routes and navigation....131

Defining an error page and title....134

Dynamic routes – wildcards and parameters....137

Securing routes – guards....143

Optimizing the experience – Resolve....150

Summary....152

Chapter 8: Improving Backend Integrations: the Interceptor Pattern....154

Technical requirements....155

Attaching the token to the request with an interceptor....155

Changing the request route....160

Creating a loader....162

Notifying success....165

Measuring the performance of a request....167

Summary....169

Chapter 9: Exploring Reactivity with RxJS....170

Technical requirements....170

Observables and operators....171

Handling data – transformation operators....172

Another way to subscribe – the async pipe....174

Connecting information flows – high-order operators....177

Optimizing data consumption – filter operators....178

How to choose the correct operator....180

Summary....182

Part 3: Architecture and Deployment....184

Chapter 10: Design for Tests: Best Practices....186

Technical requirements....186

What to test....187

Service tests....190

Fixing the tests and understanding TestBed....194

Component testing....198

E2E tests with Cypress....200

Summary....205

Chapter 11: Micro Frontend with Angular Elements....206

Technical requirements....206

Micro frontend – concepts and application....207

When to use a micro frontend....207

When not to use a micro frontend project....207

Slicing your application into micro frontends....208

Creating a micro frontend application with standalone components....209

Preparing a page to be loaded by the base application....214

Dynamically loading micro frontends....217

Summary....221

Chapter 12: Packaging Everything – Best Practices for Deployment....222

Technical requirements....222

Deploying the backend....223

Differentiating environments....228

Preparing the production bundle....231

Mounting a Docker image with Nginx....234

Deploying a page to Azure Static Web Apps....236

Summary....240

Chapter 13: The Angular Renaissance....242

Technical requirements....242

Updating your project with the Angular CLI....243

Using a new way to create templates – control flow....244

Improving the user experience using the defer command....247

Creating transitions between pages – view transactions....251

Simplifying application states – Angular Signals....253

Summary....258

Index....260

Other Books You May Enjoy....267

Single page applications (SPAs) have become the standard for most web experiences. Angular, with its batteries-included approach, has emerged as a powerful framework for simplifying the development of these interfaces by offering a comprehensive toolbox. This book guides you through the Angular ecosystem, uncovering invaluable design patterns and harnessing its essential features.

The book begins by laying a strong foundation, helping you understand when and why Angular should be your web development framework of choice. The next set of chapters will help you gain expertise in component design and architecting efficient, flexible, and high-performing communication patterns between components. You'll then delve into Angular's advanced features to create forms in a productive and secure way with robust data model typing. You'll also learn how to enhance productivity using interceptors to reuse code for common functionalities, such as token management, across various apps. The book also covers micro frontend architecture in depth to effectively apply this architectural approach and concludes by helping you master the art of crafting tests and handling errors effortlessly.

By the end of this book, you'll have unlocked the full potential of the Angular framework.

What you will learn

• Discover effective strategies for organizing your Angular project for enhanced efficiency
• Harness the power of TypeScript to boost productivity and the overall quality of your Angular project
• Implement proven design patterns to streamline the structure and communication between components
• Simplify complex applications by integrating micro frontend and standalone components
• Optimize the deployment process for top-notch application performance
• Leverage Angular signals and standalone components to create performant applications

Who this book is for

Whether you're a web developer or a tech leader engaged in frontend development, be it for small-scale projects or large, complex systems, you'll find this book useful to enhance both the quality and performance of your applications. Web architects seeking to design robust and adaptable frontend applications while leveraging Angular's extensive feature set will discover valuable insights within these pages.