angular-zoneless
ALWAYS use when working with Angular Zoneless, zoneless change detection, provideZonelessChangeDetection, or removing zone.js in Angular applications.
What this skill does
# Angular Zoneless
**Version:** Angular 19+ (2025)
**Tags:** Zoneless, Change Detection, Signals, Reactivity
**References:** [Zoneless Guide](https://angular.dev/guide/experimental/zoneless) • [Signals](https://angular.dev/guide/signals)
## API Changes
This section documents recent version-specific API changes.
- NEW: provideZonelessChangeDetection — Enable zoneless mode [source](https://angular.dev/guide/experimental/zoneless)
- NEW: afterNextRender — Run code after rendering without zone.js
- NEW: Experimental Zoneless — Available since Angular 17, stable in Angular 19+
- NEW: signal() + computed() — Works without zone.js
## Best Practices
- Enable zoneless change detection
```ts
export const appConfig: ApplicationConfig = {
providers: [
provideZonelessChangeDetection()
]
};
```
- Use signals for reactivity
```ts
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
template: `
<p>Count: {{ count() }}</p>
<p>Double: {{ double() }}</p>
`
})
export class CounterComponent {
count = signal(0);
double = computed(() => this.count() * 2);
increment() {
this.count.update(c => c + 1);
}
}
```
- Use afterNextRender for DOM operations
```ts
constructor() {
afterNextRender(() => {
// Runs after rendering, outside zone
this.initChart();
});
}
```
- Use afterRender for repeated operations
```ts
constructor() {
afterRender(() => {
// Runs after every render
});
}
```
- Handle async without zone.js
```ts
@Component({
template: `
@if (data$ | async; as data) {
{{ data.name }}
}
`
})
export class AsyncComponent {
data$ = from(fetch('/api/data')).pipe(
share()
);
}
```
- Use ChangeDetectorRef manually when needed
```ts
constructor(private cdr: ChangeDetectorRef) {}
update() {
this.value = newValue;
this.cdr.markForCheck();
}
```
- Remove zone.js from polyfills
```ts
// polyfills.ts
// Remove or comment out zone.js import
// import 'zone.js';
```
- Use untracked for non-reactive reads
```ts
import { untracked } from '@angular/core';
ngOnInit() {
// Read without creating dependency
const value = untracked(() => this.signal());
}
```
- Handle browser events
```ts
@HostListener('click')
onClick() {
// Works without zone.js
this.count.update(c => c + 1);
}
```
- Test in zoneless mode
```ts
TestBed.configureTestingModule({
providers: [
provideZonelessChangeDetection()
]
});
```
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