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Upgrade to Angular 21

Recipe IDorg.openrewrite.angular.UpgradeToAngular21

Artifact@openrewrite/recipes-angular

Migrates Angular 20.x applications to Angular 21. This includes running the Angular 20 migration first, flagging Karma test runner usage for Vitest migration, deprecated NgClass, zone.js-dependent test helpers, and upgrading TypeScript to 5.9.x.

Composite recipeOpenRewriteModerne Proprietary License

Try in PlatformTry this recipe in the Moderne platform. Not a user yet? You’ll get a no-setup demo environment, with nothing to install or configure.

Definition

Recipes14

• Upgrade to Angular 20
• Find Karma test runner usage
• Find CommonModule usage
• Find NgClass usage
• Find NgStyle usage
• Find zone.js-dependent test helper usage
• Migrate constructor injection to inject()
• Migrate @Input() to signal-based input()
• Migrate @Output() to signal-based output()
• Migrate query decorators to signal-based functions
• Upgrade npm dependency version
• Upgrade npm dependency version
• Upgrade npm dependency version
• Upgrade npm dependency version

Usage

Run this recipe

In order to run JavaScript recipes, you will need to use the Moderne CLI. For JavaScript specific configuration instructions, please see our configuring JavaScript guide.

Once the CLI is installed, you can install this JavaScript recipe package by running the following command:

Install the recipe package

mod config recipes npm install @openrewrite/recipes-angular

Then, you can run the recipe via:

Run the recipe

mod run . --recipe org.openrewrite.angular.UpgradeToAngular21