In zone.js

This is exactly the case in Angular. This functionality is implemented with zones using zone.js.

At ng-conf, in 2014, Brian Ford gave a talk about zones. Brian presented zones as meta-monkey patching of browser APIs. The zone.js is a library developed by the Angular team, which implements zones in JavaScript. They represent an execution context, which allows us to intercept asynchronous browser calls. Basically, using zones, we are able to invoke a piece of logic just after the given XMLHttpRequest object completes or when we receive a new WebSocket event. Angular took advantage of zone.js by intercepting asynchronous browser events and invoking the digest loop just at the right time. This totally eliminates the need for explicit calls of the digest loop by the developer using Angular.