Angular has traditionally relied on Zone.js to help detect asynchronous activity and trigger change detection. With zoneless change detection, Angular can schedule UI updates without depending on Zone.js to track those activities.

For developers, the important question is not simply how to remove Zone.js. It is how Angular knows when the UI needs to update once Zone.js is no longer responsible for scheduling change detection.

This affects how teams work with Signals, RxJS, asynchronous callbacks, component state, and third-party libraries.

In this guide, we'll examine what changes in a zoneless Angular application, explore practical code examples, and cover what to test before migrating an existing project.

What Is Zoneless Change Detection in Angular?

Zone.js helps Angular identify asynchronous operations that may require change detection.…