Welcome to the world of Angular library development! If you’re looking to create a library that can be reused across Angular applications, you’ve come to the right place. In this article, we will guide you step-by-step on how to use ng-packagr to compile and package your Angular libraries in Angular Package Format (APF). Get ready to unleash the power of reusable code!

Installation

To get started, you need to install ng-packagr. Open your terminal and run the following command:

npm install -D ng-packagr

Usage Example

Let’s walk through the process of building an Angular library from TypeScript sources. For simplicity, we will create a configuration file called ng-package.json, which will guide our build process.

Step 1: Create ng-package.json

Create a file named ng-package.json in your project folder and include the following JSON structure:

{
  "$schema": "./node_modules/ng-packagr/ng-package.schema.json",
  ...
}

Step 2: Run ng-packagr

You can easily run ng-packagr through a npm/yarn script. Add the following script to your package.json:

scripts: {
    "build": "ng-packagr -p ng-package.json"
}

Now, execute the build with the following command:

yarn build

Output

The build output will be written to the dist folder, containing all the necessary binaries that conform to the Angular Package Format specification. Congrats! You can now publish your Angular library with:

npm publish dist

Features of ng-packagr

• :gift: Implements Angular Package Format
• :checkered_flag: Bundles your library in FESM2022
• :school_satchel: Can be consumed by Angular CLI, Webpack, or ESM Bundlers
• :dancer: Creates type definitions (.d.ts)
• :mag_right: Supports both scoped and non-scoped packages for npm
• :surfer: Inlines Templates and Stylesheets
• :sparkles: Has CSS Features
• :camel: Runs SCSS preprocessor, supporting custom include paths
• :monkey: Adds vendor-specific prefixes using autoprefixer
• :tiger: Embeds asset data using postcss-url

Troubleshooting

If you encounter any issues during the process, consider the following troubleshooting methods:

• Ensure that your ng-package.json is correctly formatted and paths are set properly.
• Make sure you have installed all necessary dependencies.
• Running the build command may require administrative privileges, depending on your system.
• Check your terminal for any error messages to identify what might be wrong.

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