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What is Zone.js, how does it monkey-patch browser APIs, and how do you build a Zoneless Angular application?

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01

Understand the problem

Explain Zone.js, dirty checking, and building applications without Zones in Angular 18.

performancezoneless
02

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03

Study the solution

Zone.js wraps browser async APIs (events, timers, HTTP) to trigger automatic change detection. In Angular 18, you can build a Zoneless application using provideExperimentalZonelessChangeDetection() and signals, removing Zone.js overhead.

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04

Read the code

Bootstrapping a Zoneless application in Angular 18
import { bootstrapApplication } from '@angular/platform-browser';
import { provideExperimentalZonelessChangeDetection, Component, signal } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,
  template: '<button (click)="inc()">Count: {{ count() }}</button>'
})
class AppComponent {
  count = signal(0);
  inc() { this.count.update(c => c + 1); }
}

bootstrapApplication(AppComponent, {
  providers: [
    provideExperimentalZonelessChangeDetection()
  ]
});
05

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