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Schematics: Generating custom Angular Code with the CLI

Manfred Steyer

Learn how to generate custom code and how to update existing files with Schematics, the Angular CLI's code generator.

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About

About

About the Book

Besides creative aspects, programming also involves performing boring repeating tasks. Some of them can be solved by creating reusable libraries. For the rest, we can leverage code generation. This is what this book is about. It shows how to make use of Schematics, the code generator behind the Angular CLI to generate custom Angular code. Using an example, you will learn how to scaffold a new Schematics project, how to work with templates and how to manipulate existing code.

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JavaScriptAngularJS

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Author

About the Author

Manfred Steyer

Trainer, consultant and programming architect with focus on Angular. Google Developer Expert (GDE) and Trusted Collaborator in the Angular team who writes for O'Reilly, the German Java Magazine, and windows.developer. Regularly speaks at conferences.

Provides Angular workshops and consultancy.

Contents

Table of Contents

Introduction

  1. Used Version
  2. Angular Labs Project means Changes ahead!
  3. BETA-Book
  4. Help to improve this book
  5. About the Author
  6. Acknowledgments

Generating Custom Code with the Angular CLI and Schematics

  1. Goal
  2. Scaffolding a Collection for Schematics … with Schematics
  3. Adding an custom Schematic
  4. Schematic Factory
  5. Templates
  6. Building and Testing with a Sample Application

Modifying NgModules

  1. Goal
  2. Utility Functions provided by the Angular CLI
  3. Creating a Rule for adding a declaration to an NgModule
  4. Extending the used Options Class and its JSON schema
  5. Calling the Rule
  6. Testing the extended Schematic

Extending existing Code with TypeScript’s Compiler API

  1. Walking a Syntax Tree with the TypeScript Compiler API
  2. Providing Key Data
  3. Adding a new constructor
  4. Adding a constructor argument
  5. Deciding whether to create or modify a Constructor
  6. Putting all together
  7. Adding Rule to Schematic
  8. Testing the extended Schematic

Frictionless Library Setup with the Angular CLI and Schematics

  1. Goal
  2. Getting Started
  3. Adding an ng-add Schematic
  4. Adjusting the Build Script
  5. Test the Schematic Directly
  6. Test the Schematic via an npm Registry
  7. Extend our Schematic
  8. Conclusion

Seamlessly Updating your Angular Libraries with ng update

  1. Introducing a Breaking Change
  2. Creating the Migration Schematic
  3. Configuring the Migration Schematic
  4. Test, Publish, and Update
  5. Updating the Library

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